Nondestructive Evaluation of Residual Stresses in Welded Joints with Application to Stochastic Fatigue Damage Accumulation

2004 ◽  
pp. 72-96 ◽  
Author(s):  
Shahram Sarkani ◽  
George Michaelov ◽  
Loren Lutes
Keyword(s):  
Residual Stresses ◽  
Nondestructive Evaluation ◽  
Fatigue Damage ◽  
Welded Joints ◽  
Damage Accumulation ◽  
Fatigue Damage Accumulation

scholarly journals Modeling of fatigue damage accumulation in multiple contact of pre-stressed bodies in the presence of wear

2020 ◽  
pp. 78-88
Author(s):  
Ирина Георгиевна Горячева ◽  
Елена Владимировна Торская
Keyword(s):  
Shear Stress ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Residual Stresses ◽  
Fatigue Damage ◽  
Damage Accumulation ◽  
Rolling Contact ◽  
Surface Wear ◽  
Fatigue Damage Accumulation ◽  
Relative Slippage

Рассматривается влияние остаточных напряжений, формирующихся при различных видах поверхностной обработки элементов пар трения, на скорость накопления контактно-усталостных повреждений, возникающих при циклическом нагружении поверхностей взаимодействующих тел в условиях трения качения при наличии поверхностного изнашивания. Исследовано влияние относительного проскальзывания, коэффициента трения скольжения, величины остаточных напряжений на распределение амплитудных значений максимальных касательных напряжений. Полученные результаты использованы для анализа влияния поля остаточных напряжений и скорости поверхностного изнашивания на процесс накопления контактно-усталостных повреждений. Residual stresses are formed during various types of surface treatment of elements of friction pairs. The effect of the residual stresses on the rate of fatigue damage accumulation is considered for the case of cyclic rolling contact in the presence of surface wear. The effect of relative slippage, friction coefficient, and residual stresses on the distribution of the amplitude values of the principal shear stress is studied. The results are used to analyze the effect of the residual stresses and the surface wear rate on the fatigue damage accumulation.

Fatigue damage accumulation around notches

2004 ◽  
Vol 46 (6) ◽  
pp. 309-313
Author(s):  
Yutaka Iino ◽  
Hideo Yano
Keyword(s):  
Fatigue Damage ◽  
Damage Accumulation ◽  
Fatigue Damage Accumulation

Different Fatigue Dynamics Under Statistically and Spectrally Similar Deterministic and Stochastic Excitations

2013 ◽  
Vol 81 (4) ◽  
Author(s):  
Son Hai Nguyen ◽  
Mike Falco ◽  
Ming Liu ◽  
David Chelidze
Keyword(s):  
Crack Growth ◽  
Fatigue Damage ◽  
Damage Accumulation ◽  
Growth Dynamics ◽  
Experimental System ◽  
Counting Method ◽  
Random Loading ◽  
Stochastic Excitations ◽  
Fatigue Damage Accumulation ◽  
System Coupling

Estimating and tracking crack growth dynamics is essential for fatigue failure prediction. A new experimental system—coupling structural and crack growth dynamics—was used to show fatigue damage accumulation is different under chaotic (i.e., deterministic) and stochastic (i.e., random) loading, even when both excitations possess the same spectral and statistical signatures. Furthermore, the conventional rain-flow counting method considerably overestimates damage in case of chaotic forcing. Important nonlinear loading characteristics, which can explain the observed discrepancies, are identified and suggested to be included as loading parameters in new macroscopic fatigue models.

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