Evaluation of different techniques in estimating orientation of crack initiation planes and fatigue lifetime under complex multiaxial loading paths

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.

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Influence of local mechanical loading paths on the oxidation assisted crack initiation of alloy 718

Materials Science and Engineering A ◽

10.1016/j.msea.2011.11.030 ◽

2012 ◽

Vol 533 ◽

pp. 43-49 ◽

Cited By ~ 4

Author(s):

Benoît Ter-Ovanessian ◽

Dominique Poquillon ◽

Jean-Marc Cloué ◽

Eric Andrieu

Keyword(s):

Crack Initiation ◽

Mechanical Loading ◽

Alloy 718 ◽

Loading Paths

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Cyclic Deformation and Crack Initiation in Tubes Under Multiaxial Loading

Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3 ◽

10.1007/978-94-011-2860-5_50 ◽

1992 ◽

pp. 304-310

Author(s):

B. Windelband ◽

B. Schinke ◽

D. Munz

Keyword(s):

Crack Initiation ◽

Cyclic Deformation ◽

Multiaxial Loading

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A New Crack Initiation Life Prediction Method for Arbitrary Multiaxial Loading Considering Mean Stress Effect

Fatigue '96 ◽

10.1016/b978-008042268-8/50044-7 ◽

1996 ◽

pp. 1007-1012 ◽

Cited By ~ 5

Author(s):

W. Ott ◽

O. Baumgart ◽

K.H. Trautmann ◽

H. Nowack

Keyword(s):

Crack Initiation ◽

Life Prediction ◽

Prediction Method ◽

Stress Effect ◽

Mean Stress ◽

Multiaxial Loading ◽

Mean Stress Effect ◽

Crack Initiation Life

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A coupled crack initiation and propagation numerical procedure for combined fretting wear and fretting fatigue lifetime assessment

Theoretical and Applied Fracture Mechanics ◽

10.1016/j.tafmec.2019.03.005 ◽

2019 ◽

Vol 101 ◽

pp. 294-305 ◽

Cited By ~ 8

Author(s):

I. Llavori ◽

A. Zabala ◽

M.A. Urchegui ◽

W. Tato ◽

X. Gómez

Keyword(s):

Crack Initiation ◽

Numerical Procedure ◽

Fretting Fatigue ◽

Fretting Wear ◽

Crack Initiation And Propagation ◽

Fatigue Lifetime ◽

Initiation And Propagation

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Mean Strain Effect on Crack Initiation Lives for Notched Specimens Under Biaxial Nonproportional Loading Paths

Journal of Engineering Materials and Technology ◽

10.1115/1.2805962 ◽

1997 ◽

Vol 119 (1) ◽

pp. 104-112 ◽

Cited By ~ 20

Author(s):

Ming-Chuen Yip ◽

Yi-Ming Jen

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Crack Initiation ◽

Strain Effect ◽

Nonproportional Loading ◽

Notched Specimens ◽

Loading Paths ◽

The Mean ◽

Mean Strain ◽

Element Method

This paper discusses the mean strain effect on the crack initiation lives for notched specimens under biaxial nonproportional loading paths. Elastic-plastic finite element method was used to evaluate the local stresses and strains. Several prediction models related to the mean stress/strain effect were employed to correlate the experimental results with reference fatigue data for smooth specimens. It is found that Fatemi-Socie model gives good prediction for the present research with the assistance of finite element method. The stress behavior in this deflection-controlled tests is discussed in this study, and the failure surfaces are also examined after tests.

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