Wszystkie pola: crack growth - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of fatigue crack growth in ship structural details
Autorzy:: Leheta, H. W.
Elhewy, A. M. H.
Younes, H. A.
Powiązania:: https://bibliotekanauki.pl/articles/259607.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: fatigue crack
linear elastic fracture mechanics (LEFM)
finite element method (FEM)
Opis:: Fatigue failure avoidance is a goal that can be achieved only if the fatigue design is an integral part of the original design program. The purpose of fatigue design is to ensure that the structure has adequate fatigue life. Calculated fatigue life can form the basis for meaningful and efficient inspection programs during fabrication and throughout the life of the ship. The main objective of this paper is to develop an add-on program for the analysis of fatigue crack growth in ship structural details. The developed program will be an add-on script in a pre-existing package. A crack propagation in a tanker side connection is analyzed by using the developed program based on linear elastic fracture mechanics (LEFM) and finite element method (FEM). The basic idea of the developed application is that a finite element model of this side connection will be first analyzed by using ABAQUS and from the results of this analysis the location of the highest stresses will be revealed. At this location, an initial crack will be introduced to the finite element model and from the results of the new crack model the direction of the crack propagation and the values of the stress intensity factors, will be known. By using the calculated direction of propagation a new segment will be added to the crack and then the model is analyzed again. The last step will be repeated until the calculated stress intensity factors reach the critical value.
Źródło:: Polish Maritime Research; 2016, 2; 71-82
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Assessing surface fatigue crack growth in railway wheelset axle
Autorzy:: Rudavskyi, D. V.
Kaniuk, Yu. I.
Duriagina, Z. A.
Kulyk, V. V.
Shefer, M. S.
Dolinska, I. Ya.
Powiązania:: https://bibliotekanauki.pl/articles/1818483.pdf
Data publikacji:: 2020
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: fatigue crack growth
mixed mode
railway axles
stress intensity factor
estimation model
wzrost pęknięć zmęczeniowych
tryb mieszany
osie kolejowe
współczynnik intensywności naprężeń
model szacowania
Opis:: Purpose: The aim of the proposed research is to create a calculation model of surface fatigue crack growth at the axle of railway wheelset working under operational loads. Design/methodology/approach: The energy approach of the fracture mechanics was used to formulate the calculation model of fatigue crack propagation at the wheelset axle surface. The method of least squares was used to determine the investigated material mechanical constants that the kinetic equations of the calculation model contain. The system of differential equations of crack growth kinetics was solved numerically using the Runge-Kutta method. Findings: On the basis of the energy approach of the fracture mechanics the calculation model of fatigue macrocrack growth in three-dimensional elastic-plastic body in case of a mixed-mode I+II+III macromechanism of fracture has been built. On the basis of the created calculation model, the kinetics of the growth of fatigue cracks was investigated both in the middle part of the wheelset axle and in the axle journal. Research limitations/implications: The results obtained on laboratory specimens should be tested during a real railway wheelset axle investigation. Practical implications: The created calculation model can be used in practice to formulate method of residual lifetime estimation of railway wheelset axle. Originality/value: It was shown, that surface crack kinetics depends not only on the crack initial area but also significantly depends on the crack edge geometry and comparatively small crack-like defects at the wheelset axle surface can reach critical sizes in comparatively short run. It has been found that mechanical shear stresses caused by the weight of the loaded railway wagon in the cross section of the wheelset axle journal can significantly accelerate the growth of the transverse fatigue crack at the axle surface, reducing the period of crack subcritical growth by about 20%.
Źródło:: Archives of Materials Science and Engineering; 2020, 106, 2; 59--67
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Crack growth diagnostic of ball bearing using vibration analysis
Autorzy:: Belaidi, S.
Lecheb, S.
Chellil, A.
Mechakra, H.
Safi, B.
Kebir, H.
Powiązania:: https://bibliotekanauki.pl/articles/2174182.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: łożysko kulkowe
drgania
pękanie
zmęczenie
ball bearing
vibration analysis
frequency
cracking
diagnosis
fatigue life
Opis:: It is known that supported ball bearings have great effects on the vibrations of the gear transmission system, above in all the presence of local faults as well as the crack growths. For this purpose, this paper focuses on shock and vibration crack growth diagnostic of ball bearing using vibration analysis. Our work is devoted first to a study the static behaviour of the ball bearing by determining the stress, strain and displacement, then its dynamic behaviour by determining the first four natural frequencies. Secondly, a dynamic analysis study of the bearing was carried with defects as a function of crack size and location. The obtained results clearly show that the natural frequencies decrease in a non-linear way with the growth of the length of the crack, on the other hand the stress increases with the presence of the singular points of the crack. Finally, this residual decrease in natural frequencies can be used as an indicator of the state of failure, as well as a parameter used for the diagnosis and screening, and to highlight the fatigue life of the bearing.
Źródło:: International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 35--45
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: 4.

Tytuł:: Modelling of crack growth initiation in a linear viscoelastic material
Autorzy:: Dubois, F.
Chazal, C.
Petit, C.
Powiązania:: https://bibliotekanauki.pl/articles/279595.pdf
Data publikacji:: 1999
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: viscoelasticity
fracture mechanics
crack growth initiation
Opis:: Widespread application of viscoelastic materials the structures, which have to operate for a long time, requires better understanding of their mechanical behaviour and fracture properties. It has been observed that time dependence is of great importance in determining the rate of crack growth. The effects of viscoelastic characteristic on creep crack growth initiation are studied in the paper by using the finite element method. In order to define diplacements and stresses around the crack tip in linear isotropic viscoelastic media new formulation in the time domain has been produced. We formulate a new constitutive equation in terms of the stress and crack opening intensity factors, using the correspondance principle by means of Volterra integrals. Afterwards, the fracture parameters are computed with an incremental viscoelastic formulation.
Szeroko rozpowszechnione konstrukcje z materiałów lepkosprężystych, które muszą działać przez długi czas, wymagają lepszego zrozumienia ich mechanicznego zachowania i właściwości przy zniszczeniu. Zaobserwowano, że zależność od czasu ma ogromne znaczenie przy wyznaczaniu prędkości wzrostu pęnięcia. W pracy rozpatrzono efekt charakterystyki sprężysto-lepkiej na inicjacje wzrostu pęknięcia przy pełzaniu wykorzystując metodę elementów skończonych. Zaproponowano nowe sformułowania w przestrzeni czasu dla liniowych, izotropowych ośrodków sprężystoplastycznych w celu wyznaczania przemieszczeń i naprężeń wokół wierzchołka szczeliny. Zaproponowano nowe równania konstytutywne zależności współczynników intensywności naprężeń i otwarcia szczeliny wykorzystując odpowiadającą zaszdę całek Volterra. W rezultacie obliczono parametry zniszczenia w procesie spzrężonym z przyrostowym sformułowaniem sprężystolepkim.
Źródło:: Journal of Theoretical and Applied Mechanics; 1999, 2; 207-222
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Predicting Fatigue Crack Growth and Fatigue Life Under Variable Amplitude Loading
Autorzy:: Jasztal, M.
Kocanda, D.
Tomaszek, H.
Powiązania:: https://bibliotekanauki.pl/articles/97891.pdf
Data publikacji:: 2010
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Opis:: A probabilistic approach to the description of fatigue crack growth and fatigue life estimation of a component subjected to variable amplitude loading is presented in the paper. The core of the model is a differential equation originated from the Paris formula. In order to consider the influence of overload-underload cycles existing in an exploitive load spectrum on crack growth rate for an aeronautical aluminum alloy sheet, the modified Willenborg retardation model was applied.
Źródło:: Fatigue of Aircraft Structures; 2010, 2; 37-51
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Monitoring of Crack Growth in a Structure Under a Composite Patch
Autorzy:: Sałaciński, M.
Synaszko, P.
Stefaniuk, M.
Dragan, K.
Powiązania:: https://bibliotekanauki.pl/articles/97971.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Opis:: In civil as well as in military aviation, boron, carbon and aramid fiber reinforced composites are employed for the repair of metal structures. After such composite bonded repairs, the monitoring of the repaired structure along with the composite patch and its bond is necessary. The paper describes the possibilities of utilizing NDT methods for periodical check-ups and examinations. Also, a novel approach to continuous monitoring of the repaired structure is presented.
Źródło:: Fatigue of Aircraft Structures; 2011, 3; 103-111
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Strength Testing and Analysis of Fatigue Crack Growth in Selected Aircraft Materials
Autorzy:: Kłysz, S.
Lisiecki, J.
Powiązania:: https://bibliotekanauki.pl/articles/97903.pdf
Data publikacji:: 2009
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Opis:: The study has been intended to determine the most essential mechanical and fatigue properties as well as impact strength of the 30HGSNA steel, to gain own data on the above-mentioned characteristics of materials to be used further on in numerical analyses of life estimates of aeronautical structural components. The scope of the study comprised the following assignments:
- determination of the most fundamental mechanical properties and impact strength of materials,
- low-cycle fatigue testing and evaluation of the Manson-Coffin curves,
- high-cycle fatigue testing and evaluation of the Wöhler curves,
- investigation into fatigue crack growth rates at constant and variable load-cycle amplitudes (determination of curves da/dN = f(ΔK, R), coefficients in Paris and NASGRO equations, coefficients in the Wheeler models of delay, the value of K_th(R)),
- crack toughness testing under the plane-state-of-strain conditions at room temperature (determination of the K_Ic(R)). The strength/fatigue testing was carried out in the Laboratory for Materials Strength Testing of the AFIT’s Division for Aeronautical Systems Reliability and Safety, the lab being accredited by the Polish Centre for Accreditation (Accreditation Certificate No.: AB 430).
Źródło:: Fatigue of Aircraft Structures; 2009, 1; 74-83
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Experimental and Theoretical Investigations of Fatigue Crack Growth in D16 Alloy
Autorzy:: Śnieżek, L.
Powiązania:: https://bibliotekanauki.pl/articles/97817.pdf
Data publikacji:: 2009
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Opis:: In this work the arising and development of fatigue crack in aluminium alloy D16, taking into consideration the influence of notch in the form of hole with incisions which were done on its sides were tested. The process of working out of tests' programme was preceded by numeric analysis of stresses pattern and strains distribution in the zone of notch’s influence which was focused on determination of stresses' face values. To examine stress and strain distributions, the specialised FEM software (MSC.Patran and MSC.Nastran) was applied. Findings have been presented in the form of a statement of σ_max and ε_max values, and functions of the following factors: a_σ, a_ε, and a_k, computed on the grounds of these values for both different distances from the bottom of the notch and assumed levels of loading the specimens. Theoretical analysis has been supplemented with experimental investigation into the microstructure of fatigue-fracture surfaces in the area of crack initiation and that of fatigue of a propagating crack. The paper has been intended to present a model of the probabilistic estimation of fatigue life of structural members. The model has been based on the deterministic description of the cracking. Analyzed were components with notches in the form of centrally located holes with side cuts. In the method of probabilistically approaching the crack propagation, some dependences have been used that take account of the presence of areas showing plastic strains in front of crack tips. It has been assumed that the cracking can be modeled on the grounds of some general-purpose quantity used to describe the energy state in the area of the crack tip, i.e. the Rice's integral (J). The formulated computational model has been used to estimate fatigue life of model components made of D16 alloy. Experimental work was carried out using some flat specimens with centrally positioned holes. They were exposed to flat bending at R = 0. Analytical and experimental results have shown pretty good conformity.
Źródło:: Fatigue of Aircraft Structures; 2009, 1; 170-190
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Fatigue crack growth peculiarties and modifications of the Wheeler retardation model (Part 1)
Autorzy:: Kłysz, S.
Powiązania:: https://bibliotekanauki.pl/articles/279848.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: crack growth
overloads
retardation
Wheeler model
Opis:: What has been given consideration in the paper, are peculiarities of fatigue crack growth, ones referred to curves of a crack length vs. the number of cycles or the rate of propagation vs. the range of stress intensity factor, i.e. the curves typical of tests with overloads applied in cycles - for the PA7 aluminium alloy ang 18G2A steel. Difficulties with the model-based description (based on the Wheeler retardation model) of fatigue crack growth have been shown as due to the peculiarities discussed.
Osobliwości rozwoju pęknięć zmęczeniowych i modyfikacja modelu opóźnień Wheelera - część 1. Przedstawiono osobliwości przebiegu pęknięć zmęczeniowych w odniesienu do krzywych długości pęknięcia w funkcji liczby cykli lub prędkości propagacji w funkcji zakresu współczynnika intensywności naprężeń - to jest krzywych typowych dla badań z przeciążeniami zadawanymi cyklicznie. Badano stop aluminium PA7 i stal 18G2A. Omówiono trudności w opisie modelowym propagacji pęknięć (w oparciu o model opóżnień Wheelera) w związku z omawianymi osobliwościami.
Źródło:: Journal of Theoretical and Applied Mechanics; 2001, 39, 4; 825-842
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Fatigue crack growth peculiarities and modifications of the Wheeler retardation model (Part 2)
Autorzy:: Kłysz, S.
Powiązania:: https://bibliotekanauki.pl/articles/279780.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: crack growth
overloads
retardation
Wheeler model
Opis:: Modifications of the Wheeler retardation model have been presented in the paper. The modifications improve description of data resulting from investigations on fatigue crack growth phenomena, in particular, for higher values of overloads.
Osobliwości rozwoju pęknięć zmęczeniowych i modyfikacja modelu opóźnień Wheelera - część 2. Przedstawiono modyfikacje modelu opóźnień Wheelera rozwoju pęknięć zmęczeniowych. Modyfikacje te poprawiają możliwości opisu danych doświadczalnych z badań propagacji pęknięć zmęczeniowych, w szczególności dla dużych przeciążeń. Przedstawiono przykłady opisu danych doświadczalnych przy użyciu zmodyfikowanego modelu opóźnień Wheelera.
Źródło:: Journal of Theoretical and Applied Mechanics; 2001, 39, 4; 843-859
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Modelling of fatigue short crack growth in a polycrystalline metal under reversed torsion
Autorzy:: Kocańda, Dorota.
Kocańda, Stanisław.
Powiązania:: Biuletyn Wojskowej Akademii Technicznej 2003, nr 8/9, s. 205-223
Data publikacji:: 2003
Tematy:: Wytrzymałość konstrukcji i materiałów
Opis:: Fig., tab.; Bibliogr.; Sum.
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 12.

Tytuł:: Crack Growth Analysis of the Landing Gear Pull Rod of the Fighter Jet Aircraft
Autorzy:: Kurdelski, M.
Leski, A.
Powiązania:: https://bibliotekanauki.pl/articles/97773.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: crack growth
fatigue
flight tests
landing gear
Opis:: This paper describes the problem of searching for the causes of damage in the form of rupture of a strength member of the main landing gear. There have been two incidents noted which both occurred during hangar storage. It should be pointed out that the two occurrences mentioned concern a particular aircraft currently in operation, and that these incidents occurred a few days after the last flight. This article presents part of the investigation process needed to determine the causes of cracks in the test item. The crack growth analysis of the pull rod was performed using the NASGRO software. In order to perform the calculations, the information was gathered during previously conducted material studies and flight tests.
Źródło:: Fatigue of Aircraft Structures; 2011, 3; 64-73
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Crack growth path simulation in a cement mantle of THR using crack box technique
Autorzy:: Boulenouar, Abdelkader
Bendida, Nadjet
Powiązania:: https://bibliotekanauki.pl/articles/279575.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: stress intensity factor
crack propagation
orthopedic cement
total hip replacement
Opis:: A numerical method for 2D LEFM crack propagation simulation in a cement mantle of the total hip replacement (THR) is presented. This work is based on the implementation of the displacement correlation technique (DCT) and the maximum circumferential stress (MCS) theory in a finite element code, using the Ansys Parametric Design Language (APDL). At each crack increment length, the crack direction angle is evaluated as a function of stress intensity factors (SIFs). The crack box technique is investigated for crack propagation simulation. The advantage of this technique is facilitation of the automatic remeshing of the structure during crack extension. In this paper, we analyzed the mechanical behavior of cracks initiated in the cement mantle by evaluating the SIFs. The effect of the cavities and the initial crack directions on the crack growth path has been highlighted.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 317-329
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Corrosion Fatigue Crack Growth Studies on Pressure Vessel and Piping Steels in Water Environment
Autorzy:: Mathew, N. M.
Vishnuvardhan, S.
Raghava, G.
Santhi, A. S.
Powiązania:: https://bibliotekanauki.pl/articles/356301.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fatigue crack growth
corrosion fatigue
ESE(T) Specimen
SA 333 Gr.6 steel
SA 516 Gr.70 steel
Opis:: Corrosion fatigue crack growth studies were conducted on eccentrically-loaded single edge notch tension specimens made of SA 333 Gr. 6 and SA 516 Gr. 70 carbon steels in water environment. The experiments were conducted using a ±250 kN capacity Universal Testing Machine under constant amplitude sinusoidal loading at a test frequency of 0.50 Hz and stress ratio of 0.1. The fabrication of test specimens and the experiments were carried out based on ASTM E 647 and ASTM E 1820. The crack initiation and growth were monitored and images were captured by using a digital camera at regular intervals of fatigue cycles. By using these images, the length of crack was measured. The tests were terminated when the uncracked portion of the specimens was insufficient to take further load. Crack growth rate and stress intensity factor range values were evaluated at incremental values of loading cycles and crack length. Using the crack growth rate vs. stress intensity factor range plots, best fit curves following power law in the form of Paris’ equation were obtained.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1857-1862
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Fatigue crack growth and probability assessment for transverse TIG welded Aluminum alloy 6013-T4
Autorzy:: Haryadi, G. D.
Tungga Dewa, R.
Ekaputra, I. M. W.
Powiązania:: https://bibliotekanauki.pl/articles/280013.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fatigue crack growth
Aluminum alloy 6013-T4
post welding heat treatment
TIG welding
Opis:: The aim of this study is to investigate the fatigue crack growth behavior with post weld heat treatments (T4) on transverse tungsten inert gas-welded Aluminum alloy 6013. All fatigue tests have been carried out using center cracked tension specimens at ambient temperature under a stress ratio of R = 0.3. The results revealed that various time of aging in T4 affects its mechanical properties, also the fatigue crack growth behavior as well. It has been observed that in the heat treated samples the crack growth rate is lower than that in the as-welded sample, but higher than the rate in the base metal. To be more specific, samples with 18 hours aging exhibit the highest tensile strength and fatigue resistance compared to the other heat treated samples. The probability assessment has also been used to determine the fatigue crack growth rate and a good linearity has been found.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 179-190
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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