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Wyszukujesz frazę "crack propagation analysis" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Numerical Simulation of Fatigue Fracture of the Turbine Disc
Autorzy:
Witek, L.
Powiązania:
https://bibliotekanauki.pl/articles/97889.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
aircraft engine
crack propagation analysis
finite element method
fatigue fracture
Opis:
This paper presents the results of the crack propagation analysis of an aircraft engine turbine disc. In the first part of the work the finite element method was used for calculation of the stress state and the stress intensity factor (SIF, KI, K-factor) in the turbine disc with an embedded quarter-elliptical corner crack, subjected to low-cycle thermo-mechanical fatigue. To refine the K-factor calculation, specially degenerated finite elements were used. These elements provide stress singularity suitable for the linear-elastic material of the disc. The performed calculations yielded the stress intensity factor KI for different crack sizes. Subsequently, ΔK parameter was determined as a difference of the KI values calculated for the turbine’s speeds equal to 6373 and 14200 RPM. Based on the Paris-Erdogan equation and the obtained ΔK values, the fatigue crack growth plot for the turbine disc subjected to complex thermo-mechanical loads was determined.
Źródło:
Fatigue of Aircraft Structures; 2012, 4; 114-122
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Crack Propagation in a Steel Specimen under Bending
Autorzy:
Różyło, P.
Powiązania:
https://bibliotekanauki.pl/articles/118297.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
Abaqus
xFEM
numerical analysis
crack propagation
Opis:
The paper compares numerically modeled crack propagation in a steel specimen with a real process of fiber separation. The objective of the study was to perform numerical analysis of crack propagation in order to determine the shape of a crack and the distribution of stresses in the entire model. A CAD model of the test specimen was prepared based on geometric parameters determined for a real model. The numerical analysis was performed using the computer simulation program Abaqus 6.14. The experiment of specimen bending was conducted using bench tools. Crack propagation was simulated by the numerical method xFEM which enabled visualization of fiber separation in the test specimen. The numerical results of crack propagation were compared with the experimental findings about cracking in a real specimen.
Źródło:
Applied Computer Science; 2015, 11, 4; 20-29
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of numerical and experimental analysis of the crack propagation process
Autorzy:
Różyło, P.
Wójcik, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/117940.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
FEM
numerical analysis
crack propagation
Abaqus
ABS
Opis:
Nowadays numerical methods are a powerful tool to simulate real processes. Polymer materials are increasingly used in engineering solutions. ABS is a common material used interchangeably with respect to traditional materials. Process for the production of components for rese-arch on 3D printers is becoming more widespread and accessible to ordi-nary users. Crack propagation process was carried out at the same time to compare results through experiments performed on the testing machine and numerical study. Cracking process was carried out by finite element method, implemented on the basis of simulations xFEM. This method allows to conduct research related to the separation of the material nodes, in places of highest stress levels that exceed the limits of plasticity and strength of the material. The analysis involved comparison of the shape of the resulting cracks through experimental and numerical way.
Źródło:
Applied Computer Science; 2015, 11, 2; 60-67
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity Analysis of the Nasgro Equation Based on the PZL-130 TC-II Orlik Trainer Aircraft Full Scale Fatigue Test
Autorzy:
Reymer, Piotr
Leski, Andrzej
Kurdelski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/24201173.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
sensitivity analysis
crack propagation
full scale fatigue test
Opis:
The study investigates the sensitivity of numerical crack propagation estimations based on the Nasgro equation. The equation is widely used for crack propagation calculations since it considers the whole range of crack propagation speed from threshold to critical values of stress intensity factor range (∆K). The presented investigation is based on the actual results of the full scale fatigue test (FSFT) of the PZL-130 ‘Orlik’ TC-II aircraft. We provide a brief description of the test and the general approach followed in crack propagation estimations originally carried out after the test. The obtained results are verified in terms of variation of the input data. Overall results are compared and discussed.
Źródło:
Fatigue of Aircraft Structures; 2022, 14; 8--17
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Crack Propagation Analysis of the Compressor Blades Working in High Cycle Fatigue Condition
Autorzy:
Witek, L.
Powiązania:
https://bibliotekanauki.pl/articles/97871.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
compressor blade
failure analysis
crack propagation
vibration
FEM
Opis:
This paper presents results of experimental vibration tests of the helicopter turbo-engine compressor blades. The blades used in investigation were retired from maintenance under technical inspection of engine. Investigations were conducted for selected undamaged blades, without existence of preliminary cracks or corrosion pits. The blades during experiment were entered into transverse vibration. The crack propagation process was conducted in resonance condition. During the fatigue test, the growth of crack was monitored. In the second part of work, a nonlinear finite element method was utilized to determine the stress state of the blade during vibration. In this analysis a first mode of transverse vibration were considered. High maximum principal stress zone was found at the region of blade where the crack occurred.
Źródło:
Fatigue of Aircraft Structures; 2009, 1; 195-204
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress Intensity Factor Analysis and Fatigue Behavior of A Crack in The Residual Stress Field of Welding
Autorzy:
Terada, H.
Powiązania:
https://bibliotekanauki.pl/articles/97909.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
stress intensity factor analysis
crack
residual stress field
butt weld
stress redistribution
fatigue crack
crack propagation
Opis:
This paper deals with the behavior of a crack in the residual stress field induced by the butt weld in a wide plate. It is known that the distribution form of residual stress has similarities regardless of the welding process, although the size and the magnitude of the residual stress depend largely on the welding process. Stress intensity factor and stress redistribution induced by the crack extension were calculated for a crack with arbitrary length and location. The stress redistributions caused by crack extension obtained by the present analysis showed good agreement with the experimental data. Fatigue crack propagation behavior in the residual stress field reported by Glinka was also examined from ΔK point of view. The effect of residual stress on the fatigue crack propagation rate is considered to be the effect of varying mean stress. It was shown that fatigue crack propagation rate is estimated by the following equation with reasonable accuracy.
da/dn=CΔFα(1+ σ0/Δσ Fres)
In the above equation, material constants C and α of Paris’s law are experimentally obtained by using specimens without the weld joint.
Źródło:
Fatigue of Aircraft Structures; 2011, 3; 5-15
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Ring Cracks in Ceramic Rolling Elements Using the Boundary Element Method
Analiza pęknięć kolistych w ceramicznych elementach tocznych metodą elementów brzegowych
Autorzy:
Karaszewski, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/188083.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
crack propagation
ceramic materials
ball bearings
numerical analysis
propagacja pęknięć
materiały ceramiczne
łożyska toczne
analiza numeryczna
Opis:
Ceramic materials have been increasingly used in bearing systems for over a dozen years. This is due to the specific properties of ceramic materials, such as high hardness, corrosion resistance, the possibility of use in aggressive chemical environments, as well as due to the lower specific weight as compared to steel materials. However, the use of ceramic materials imposes many limitations. The main disadvantages include surface cracks and a low fracture toughness value. The paper presents a numerical analysis of crack propagation in silicon nitride balls. The directions of propagation were analysed for the cracks that are most commonly found on the surface of the commercially available ceramic balls. The directions were analysed along the crack front and considering the location of the crack in relation to the contact point of the balls in the rolling contact. The numerical calculations are based on a three-dimensional model of the ring crack. Numerical calculations were carried out using the boundary element method. Numerical solutions were compared with the results of experimental research.
Materiały ceramiczne od kilkunastu lat znajdują coraz większe zastosowanie w układach łożyskowych. Wynika to z charakterystycznych właściwości materiałów ceramicznych takich jak: duża twardość, odporność na korozję, możliwość stosowania w środowiskach agresywnie chemicznych, a także z uwagi na mniejszy ciężar właściwy w porównaniu z materiałami stalowymi. Stosowanie materiałów ceramicznych wiąże się jednak z wieloma ograniczeniami. Głównymi ich wadami są pęknięcia powierzchniowe oraz niska odporność na kruche pękanie. W pracy przedstawiono analizę numeryczną propagacji pęknięć w kulkach ceramicznych wykonanych z azotku krzemu. Analizowano kierunki propagacji dla pęknięć kolistych, które najczęściej spotykane są na powierzchni handlowych kulek ceramicznych. Kierunki pęknięć analizowano wzdłuż czoła pęknięcia oraz względem położenia pęknięcia w stosunku do punktu styku współpracujących kulek w styku tocznym. Obliczenia numeryczne oparte zostały na trójwymiarowym modelu pęknięcia kolistego. Obliczenia numeryczne analizowano metodą elementów brzegowych. Rozwiązania numeryczne porównano z wynikami badań eksperymentalnych.
Źródło:
Tribologia; 2019, 285, 3; 51-59
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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