Temat: stress concentration - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of different machining processes on fatigue life performance of engineered surfaces: a short review
Autorzy:: Grzesik, Wit
Powiązania:: https://bibliotekanauki.pl/articles/2086274.pdf
Data publikacji:: 2022
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: engineered part
surface roughness
stress concentration
fatigue life
Opis:: In this paper fundamental information on the influence of the real machined surfaces generated by different machining processes on the fatigue life of machine parts are presented. In the first part the various approaches for the assessment of the stress concentration factor and the correction of a fatigue life limit are discussed. In the second part the results of standard fatigue tests are compared with computed data and predictions using FEM based simulations. The effect of surface discontinues (valleys) in the real surface profiles is related to engineered parts made of different materials including steels, aluminium alloys, aerospace alloys and composites.
Źródło:: Journal of Machine Engineering; 2022, 22, 2; 18--30
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Designing of stress relieve groove parameters for flat endplates of pressure boilers
Autorzy:: Szybiński, B.
Barski, M.
Wygoda, M.
Powiązania:: https://bibliotekanauki.pl/articles/247780.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pressure boiler
flat ends
stress concentration
FEM analysis
Opis:: The application of flat ends as closures in pressure boilers is a certain alternative for commonly used dished ends. However, it is inevitably joined with the stress concentration presence in the vicinity of the junction between the cylindrical pipe and the ending flat plate. The notch effect, which is observed in the connection area, is usually caused by the abrupt change of the inner wall shape and the lack of the curvature continuity in this region. The problem of the stress reduction in the transition zone between the cylindrical pipe and the endplate has been studied by researchers from many years and several proposals how to modify the shape of the respective elements have been established. On the base of these results, several designs for flat end closures are proposed in the codes applied in pressure boilers calculations. This paper shows the effectiveness of one of the design proposals, admitted by code EN 13445-3. In the proposed analysis the special attention are paid to flat ending plates with the circular stress relieve grooves. The parameters of the groove radii and location of its centre are set by a system of inequalities, which usually defines the region of admissible values for radii and position of the circular groove centre. The choice of these values strongly influences the stress concentration and in the considered code, no clear suggestions or justification is given how to choose the best groove parameters, providing the minimum stress concentration. In this report, the Authors show how to choose the best combination of the design parameters providing the minimum stress concentration.
Źródło:: Journal of KONES; 2016, 23, 4; 513-520
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Design modifications of pressure boilers with flat endplates with stress relief groove
Autorzy:: Szybiński, B.
Wygoda, M.
Powiązania:: https://bibliotekanauki.pl/articles/241901.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pressure boilers
flat ends
stress concentration
FEM analysis
Opis:: Stress concentration is still present in the vicinities of structural notches in engineering structures. Zones with higher level of stress are particularly dangerous for structures subjected to fatigue or dynamic loads. The vessels with flat endplates with stress relief grooves are the common examples of such structures. Unfortunately, no clear evidence is given in existing codes how optimally to choose the circular groove radius and the optimal value of that radius depends on the dimensions of the boiler, operating conditions and the material used in manufacturing. Additionally, commonly used grooves with circular shapes are not optimal. Series of experimental tests, numerical or analytical studies presented in numerous articles confirmed these facts. In the presented article, the Authors proposed two-stage modification of the investigated vessel. The first step relies on change of the shape of the groove in the endplate, which provides certain reduction of stress concentration but still plastic deformations in the groove vicinity are not eliminated. The second step of the design modification is proposed for the boiler with the optimal elliptic groove configuration. In this step, some material is added around the top of the outer edge of the endplate. Two simple shapes are proposed for these parts - the short cylindrical ring or alternatively the circular ring welded on the top the endplate is used. For both concepts, the search of optimal dimension/parameters is performed. The numerical results of that study clearly show that the full elimination of plastic deformations near the groove is possible. The numerical analysis and optimizations were made with the well- established finite element software ANSYS, which is accepted by commonly used codes for designing of pressure vessels.
Źródło:: Journal of KONES; 2017, 24, 3; 309-316
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Shaping of a middle surface of a dished head of a circular cylindrical pressure vessel
Kształtowanie środkowej powierzchni wypukłego dna walcowego zbiornika ciśnieniowego
Autorzy:: Lewiński, J.
Magnucki, K.
Powiązania:: https://bibliotekanauki.pl/articles/280094.pdf
Data publikacji:: 2010
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: thin-walled pressure vessel
dished head
minimal stress concentration
Opis:: The paper is devoted to a dished head of a pressure vessel subject to internal uniform pressure. A short survey of optimal design of the pressure vessel and its head is presented. The problem of shaping of the middle surface of the dished head with the use of trigonometric series is depicted. As a criterion of the shaping process, the continuity of curvatures of the surfaces in the joint of the circular cylindrical shell and the dished head is assumed. Results of the numerical calculation for optimal shapes of the head are presented in figures.
Praca dotyczy dna wypukłego walcowego zbiornika ciśnieniowego obciążonego równomiernym ciśnieniem wewnętrznym. Zamieszczono krótki przegląd problemu optymalnego projektowania zbiornika i jego dna. Przedstawiono problem kształtowania środkowej powierzchni wypukłego dna z zastosowaniem szeregu trygonometrycznego. Warunek ograniczający kształt południka dna dotyczy ciągłości krzywizn w miejscu połączenia z powłoką walcową. Poszukiwano rozwiązania optymalnego, w którym głębokość dna jest minimalna przy ograniczeniu warunkiem wytrzymałości. Wyniki numerycznych obliczeń optymalnych kształtów dna przedstawiono na rysunkach.
Źródło:: Journal of Theoretical and Applied Mechanics; 2010, 48, 2; 297-307
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Adhesive contact problem for transversely isotropic elastic half-space
Zagadnienie kontaktowe z adhezją dla poprzecznie izotropowej sprężystej półprzestrzeni
Autorzy:: Pawlik, M.
Rogowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/281108.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: adhesive contact
anisotropy
integral equations
compliance
stress concentration factors
Opis:: The problem of adhesive contact for a transversely isotropic elastic half-space is considered. The problem is reduced to the solution of two coupled integral equations, and these are solved exactly. Explicit expressions are found for the contact compliance and for coefficients which characterise the singularities of contact stresses at the boundary of the contact region. The numerical results presented for some anisotropic materials show that the influence of anisotropy on the analysed mechanical quantities is significant.
Rozpatrzono adhezyjne zagadnienie kontaktowe dla poprzecznie izotropowej sprężystej półprzestrzeni. Zagadnienie zredukowano do rozwiązania dwóch sprzężonych równań całkowych, które rozwiązano dokładnie. Znaleziono w postaci jawnej wzory na podatność oraz współczynniki określające osobliwości naprężeń kontaktowych na brzegu obszaru kontaktu. Wyniki liczbowe przedstawione dla różnych materiałów pokazują wpływ anizotropii na analizowane wielkości mechaniczne.
Źródło:: Journal of Theoretical and Applied Mechanics; 2003, 41, 1; 89-105
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Numerical investigations of stress concentration in reinforcement steel structure by composite overlays
Autorzy:: Szybiński, Bogdan
Wygoda, Mateusz
Powiązania:: https://bibliotekanauki.pl/articles/242629.pdf
Data publikacji:: 2019
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: plate
hole
cut-out
stress concentration
FRP composite
reinforcement
FEM
Opis:: The stress concentration observed in the vicinity of cut-outs and holes in structural elements significantly influences the fatigue endurance of machines subjected to cyclic loads. Numerous studies have been made so far to improve this situation and increase the structure lifetime. Several design recommendations have also been worked out to avoid the problem of premature failure. The proposed article illustrates the influence of the composite overlays applied around the cut-outs made in flat steel constructional elements subjected to axial tension. The detailed study concerns the reinforcement made from the FRP (fibre reinforcement polymer) composite applied around the notches. Two types of composite materials were used, namely: TVR 380 M12/R-glass (glass fibres embedded in epoxy resin matrix) and AS4D/9310 (carbon fibres embedded in epoxy resin matrix). In the first step, the detailed numerical studies (finite element analysis) were performed for the steel samples (with no overlays added) with cut-outs made in the form of circle, square and triangle hole (the last two with rounded corners). The results of these studies were compared with the existing analytical solutions with respect to the stress concentration factors (SCF) estimation. The relatively good conformity was observed when using dense meshes of finite elements placed around the void vicinity. In the next step, the composite overlays were applied around cut-outs and their influence on the stress concentration was investigated. The influence of the fibre orientation, numbers of layers, sizes of the composite overlay used were considered. It was proved that the application of composite overlays evidently decreases the stress concentration around the notches.
Źródło:: Journal of KONES; 2019, 26, 4; 249-256
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Application of adhesive joints in reinforcement and reconstruction of weakened wooden elements loaded axially
Autorzy:: Rapp, P.
Powiązania:: https://bibliotekanauki.pl/articles/52646.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:: wood
adhesive joint
reinforcement
reconstruction
weakened element
wooden element
stress concentration
Źródło:: Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2016, 59, 196
1644-3985
Pojawia się w:: Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: An Uncertainty Model Of Approximating The Analytical Solution To The Real Case In The Field Of Stress Prediction
Autorzy:: Gutiérrez, R.
Ramírez, M.
Olmeda, E.
Díaz, V.
Powiązania:: https://bibliotekanauki.pl/articles/220703.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: uncertainty
strain gage measurement
stress concentration factor
weighted least squares algorithm
Opis:: Deterministic mechanics has been extensively used by engineers as they needed models that could predict the behavior of designed structures and components. However, modern engineering is now shifting to a new approach where the uncertainty analysis of the model inputs enables to obtain more accurate results. This paper presents an application of this new approach in the field of the stress analysis. In this case, a two-dimensional stress elasticity model is compared with the experimental stress results of five different size tubes measured with resistive strain gages. Theoretical and experimental uncertainties have been calculated by means of the Monte Carlo method and a weighted least square algorithm, respectively. The paper proposes that the analytical engineering models have to integrate an uncertainty component considering the uncertainties of the input data and phenomena observed during the test, that are difficult to adapt in the analytical model. The prediction will be thus improved, the theoretical result being much closer to the real case.
Źródło:: Metrology and Measurement Systems; 2015, 22, 3; 429-442
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Stress and Strain Concentrations in Steel Angle Tension Members Connected by One Leg
Autorzy:: Bernatowska, E.
Ślęczka, L.
Powiązania:: https://bibliotekanauki.pl/articles/105448.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:: lap bolted connections
shear lag effect
net section fracture
numerical simulations
stress concentration
strain concentration
Opis:: The paper presents the numerical simulations results of net section failure in tensioned angles. Angles are made of structural steel with nominal grade S235. Simulation takes into account ductile fracture initiation, by application of GursonTvergaard-Needleman (GTN) material model. Parametrical analysis of ultimate resistance was carried out. The finite elements analyses were conducted by ABAQUS computer program. Shear lag effect in considered joint was observed, as a non uniform tensile stress distribution in angles in the vicinity of a connection. Stress concentration areas and stress concentration factors have been predicted, both in elastic and ultimate behaviour of joint. Especially change of non-uniform stress distribution in net cross-section was observed, during increase of loading, until the ultimate resistance was reached.
Źródło:: Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 5-16
2300-5130
2300-8903
Pojawia się w:: Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Numerical Analysis of Diamond Retention in Cobalt and a Copper-Base Alloy
Analiza numeryczna retencji kryształu diamentu w kobalcie i stopie miedzi
Autorzy:: Konstanty, J.
Romanski, A.
Powiązania:: https://bibliotekanauki.pl/articles/352761.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: matrix
wear
stress concentration
residual stress
finite element
matryca
zużycie
koncentracja naprężeń
naprężenia
osnowa
Opis:: Why cobalt outperforms other matrix materials in its capacity for diamond retention in cutting tools is considered. To this end diamond loading conditions were modelled to establish the magnitude of stress and strain in the matrix surrounding a working diamond crystal. Only at 315 N did the contact force in Co result in plastic strain of 4-8%, which has a destructive influence on diamond retention. The strain field generated in a poorly performing Cu-40%Co-6%Sn matrix under a load of 190 N closely resembled that generated by 315 N in Co. It is postulated that diamond retention is related to the yield strength and work hardening characteristics of the metallic matrix.
W artykule przedstawiono analizę czynników decydujących o bardzo dobrych własnościach retencyjnych kobaltu w odniesieniu do kryształów diamentu w spiekanych materiałach narzędziowych. W tym celu przygotowano komputerowy model kryształu diamentu osadzonego w osnowie i poddanego działaniu zewnętrznego obciążenia dla ustalenia wielkości naprężeń i odkształceń pojawiających się w osnowie. Stwierdzono, że siła 315 N działająca na diament umieszczony w kobalcie powoduje odkształcenie plastyczne osnowy w zakresie 4-8%, co ma negatywny wpływ na retencje. W przypadku stopu Cu-40%Co-6%Sn podobne wartości odkształceń zaobserwowano pod działaniem siły 190 N. Na podstawie otrzymanych wyników symulacji komputerowych można stwierdzić, że własności retencyjne materiału osnowy uzależnione są od jego granicy plastyczności oraz zdolności do umocnienia wywołanego odkształceniem plastycznym.
Źródło:: Archives of Metallurgy and Materials; 2014, 59, 4; 1457-1462
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Stress concentration at load-carrying fillet welded cruciform joints subjected to tensile and bending loads
Autorzy:: Molski, Krzysztof L.
Powiązania:: https://bibliotekanauki.pl/articles/387288.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: cruciform welded joint
load-carrying fillets
stress concentration factor
stress intensity factor
finite element method
Opis:: This article presents numerical finite element method (FEM) analysis of the stress concentration at toes and crack-like faults in load-carrying fillet welded cruciform joints with transversal slits resulting from non-fused root faces. Potential fatigue damage of such joints subjected to cyclic tensile and bending loads appears in the form of fatigue cracks starting from the weld roots or toes. The aim of this article is to find qualitative and quantitative relationships between geometrical parameters of the load-carrying fillet welded cruciform joint subjected to tensile and bending loads and the stress concentration at weld toes and roots. The results of the analysis represented by the stress concentration factors (SCFs) and the stress intensity factors KI and KII are shown in the form of tables, graphs and mathematical formulas, which may be applied for fatigue assessment of such joints.
Źródło:: Acta Mechanica et Automatica; 2019, 13, 4; 245-250
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Static strength analysis of plate structures using finite element method
Autorzy:: Zachwieja, J.
Powiązania:: https://bibliotekanauki.pl/articles/2073662.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: theory of plates
stresses in plates
stress concentration
Huber-Mises energy hypothesis
Opis:: The paper presents the issues regarding modelling and strength calculations for the plate structures including thinwalled tanks and water tubes in steam boilers or heat exchangers subject to thermal stresses. In this case, the subject of the analysis is not the stress-strain state due to the pressure in the structure cross-section but the conditions at the interface between plate and lifting lugs used for handling tanks decommissioned due to technical and economic factors or replaced with the new ones.
Źródło:: Journal of Polish CIMEEAC; 2015, 10, 1; 155-160
1231-3998
Pojawia się w:: Journal of Polish CIMEEAC
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Numerical study on dimensions and orientation effect of semi-elliptical cracks in PE100 pipelines
Autorzy:: Zitouni, T. A.
Labed, Z.
Powiązania:: https://bibliotekanauki.pl/articles/2106453.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: rurociąg
pęknięcie
naprężenie
pipeline
PE100
semi-elliptical crack
stress concentration
HDPE
Opis:: The through-thickness crack or surface crack in PE100 pipes subjected to internal pressure represents a serious risk to the structural integrity of HDPE pipes, which has attracted wide attention in modern industry. Although experimental research offers reliable predictions of surface crack influence on pipes, the relatively high cost hinders its application. The numerical simulation, as a cost-effective alternative, has been widely applied to assess stress displacement and strain to the entire pipe structure. This is the initial approach adopted in recent decades. This article provides simulations tests of an uncracked pipe and cracked PE100 pipe under different internal pressure values, with varying each time the dimensions of the crack with 1 mm rate for minor and major radius and 0.5mm rates for the largest contour radius, using ANSYS MECHANICAL STRUCTURAL STATIC for simulation.
Źródło:: International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 198--207
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: A new method for measurement the residual stresses in friction stir welding
Autorzy:: Jweeg, M.J.
Hamdan, Z.Kh.
Majeed, A.H.
Resan, K.K.
Al-Waily, M.
Powiązania:: https://bibliotekanauki.pl/articles/2175734.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: FSW
residual stress
tensile test
stress concentration
AA 6061
naprężenie szczątkowe
próba rozciągania
koncentracja naprężeń
AA6061
Opis:: Purpose: The residual stresses in different welding methods are fundemental problems to consider. Friction stir welding is one of a solid state joining process, it is economical in that it permits joining together different materials, the specimens in this method (FSW) have excellent properties of mechanical as proven by tensile, flextural and fatigue tests, also it is environmentally friendly process minimizes consumption of energy and generate no gasses or smoke. In friction stir welding , there are two kinds of generated residual stresses: tensile stress and compressive stress. So, this study measuring the residual stresses by using a new method for measuring residual stresses depends on tensile testing and stress concentration factor, this method is a simple, fast and low cost, also it is not need special device. Design/methodology/approach: In previous studies, several techniques were used to predict the value of residual stress and its location, such as destructive, semi-destructive, and non-destructive methods. In this study, a simple, new, and inexpensive way was used based on the tensile test and stress concentration of the friction stir welding (FSW). Findings: By comparing the results obtained with the previous studies using the X-ray method, with the current research, it was found that the results are good in detecting the location and value of the residual stress of friction stir welding. The value of discrepancy of the residual stress in the results between those obtained by the previous method and the current method was about 3 MPa. Research limitations/implications: There are many rotational and linear feeding speeds used in this type of welding. This research used two plates from 6061 AA with 3mm thickness, 100 mm width, and 200 mm length. The rotational speed used in friction stir welding was 1400 rpm, and the feeding speed was 40 mm/min. Practical implications: The residual stress obtained with the new method is 6.2 MPa, and this result approximates other known methods such as the X-ray method in previus studies. Originality/value: Using a new simple method for measuring residual stresses of friction stir welding depends on stress concentration factor and tensile testing. This method is fast and low cost , also it is not need specialized device, compared to other methods such as x-ray or hole drilling methods.
Źródło:: Archives of Materials Science and Engineering; 2021, 112, 2; 63--69
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Stress concentration on the contour of a plate opening: analytical, numerical and experimental approach
Autorzy:: Momcilovic, N.
Motok, M.
Maneski, T
Powiązania:: https://bibliotekanauki.pl/articles/279564.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: stress concentration factor (SCF)
digital image correlation (DIC)
plate opening
small radius of curvature
Opis:: The objective of the paper is to analyze the stress concentration factor (SCF) in the corner of a rectangular plate opening with small radii of curvature and various methods for its derivation. Besides the finite element method, as the most used approach today, there are some analytical and experimental procedures that can obtain stress concentration results in such spots. An analytical approach can deliver prediction of the SCF around the corner but cannot illustrate the stress field opposite to the finite element method. On the other hand, finite element analysis needs much computation time to deal with very sensitive and fine mesh generation around concentration zones. Experimental devices, such as strain gauges are not able to perform measurements on areas where high gradient of stress occurs due to their lack of sensitiveness and larger dimensions compared to the measured part of a structure. The paper presents Digital Image Correlation (DIC) technique that obtains not only stress concentration, where other devices fail, but also provides full displacement, strain and stress field’s even where a high gradient of stress exists. These three methods are discussed, compared and illustrated on the model of a plate with rectangular opening subjected to tension.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 1003-1012
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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