scholarly journals Prediction of fatigue crack initiation life of aluminium alloy joints using cyclic elasto-plasticity FEM analysis

2018 ◽  
Vol 165 ◽  
pp. 14012
Author(s):  
Tsutsumi Seiichiro ◽  
Sano Moe ◽  
Fincato Riccardo
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Fem Analysis ◽  
Finite Element Analyses ◽  
Butt Weld ◽  
Plastic Behaviour ◽  
Elasto Plasticity ◽  
Crack Initiation Criterion

Finite element analyses (FEA) are particularly useful for investigating fatigue problems since it is possible to carry out elasto-plastic simulations for any configuration and to predict the material behaviour for a large number of loading cycles. This study aims to investigate the fatigue life for Al-Mg alloy A5083-O joints by means of numerical simulations. The Proposed method needs to give a precise description of the elasto-plastic behaviour of the alloy together with an appropriate definition of the criteria for the fatigue crack initiation. In this paper, the elasto-plastic behaviour of the A5083-O alloy was investigated by FE analyses. On the other hand, the fatigue crack initiation criterion is provided based on strain ranges observations. In detail, the finite element analyses focused the attention on the study of the service life of a butt-weld join.

Fatigue Crack Initiation in Solder Joints

1996 ◽  
Vol 118 (2) ◽  
pp. 41-44 ◽  
Author(s):  
Z. Zhang ◽  
Daping Yao ◽  
J. K. Shang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Solder Joints ◽  
Fatigue Crack Initiation ◽  
Lap Joints ◽  
Stress Cycle ◽  
Fatigue Lifetime ◽  
Peak Value

A backface strain technique is introduced to examine fatigue crack initiation in solder lap joints. The technique detects the fatigue crack initiation by monitoring the backface strain at the end of the overlap. Variation of the backface strain with the development of a crack was simulated by finite element method. The simulation indicated that the backface strain at the end of the overlap reached a peak value when a fatigue crack initiated. Experimental verification was carried out in 63Sn-37Pb solder joints. The backface strain was recorded as a function of stress cycle to demonstrate the applicability of this technique. Experimental results showed that fatigue crack initiation took about half of the fatigue lifetime of the solder joints.

scholarly journals Study on Fatigue Crack Initiation Process by Using Crystalline FEM Analysis (1st Report)

1998 ◽  
Vol 1998 (184) ◽  
pp. 347-359 ◽  
Author(s):  
Naoki Osawa ◽  
Yasumitsu Tomita ◽  
Kiyoshi Hashimoto ◽  
Katsuya Matsuda ◽  
Nobuyuki Yamaga
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Fem Analysis ◽  
Initiation Process

Multiaxial Fatigue Crack Initiation in Rubber

2001 ◽  
Vol 29 (3) ◽  
pp. 171-185 ◽  
Author(s):  
W. V. Mars
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Energy Density ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Multiaxial Fatigue ◽  
Published Data ◽  
Strain History ◽  
New Model ◽  
Material Plane

Abstract This paper describes a new model for predicting multiaxial fatigue crack initiation in rubber. The work is motivated by a need to predict crack initiation life in tires, based on strain histories obtained via finite element analysis. The new model avoids the need to explicitly include cracks in the finite element model, and applies when the cracks are small compared to the strain gradient. The model links the far-field strain state to the energy release rate of an assumed intrinsic flaw. This is accomplished through a new parameter, the cracking energy density. The cracking energy density is the portion of the total elastic strain energy density that is available to be released on a given material plane. The model includes an algorithm to select the material plane which minimizes the life prediction for a given strain history. The consequences of the theory for simple strain histories are presented, as well as predictions for more complicated histories. The theory is compared with published data, and with new results from recent combined axial/torsion fatigue experiments.

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