Creep-Fatigue Strength of Sn-8Zn-3Bi Solder Under Multiaxial Loading

Materials ◽  
2005 ◽  
Author(s):  
Takaei Yamamoto ◽  
Takamoto Itoh ◽  
Masao Sakane ◽  
Hiroshi Sasaki ◽  
Kazuhiko Shuto ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Torsion Test ◽  
Multiaxial Loading ◽  
Strain Wave ◽  
Proportional Loading ◽  
Strain Waves ◽  
Creep Fatigue ◽  
Multiaxial Creep ◽  
Strain Hold

This paper describes the multiaxial creep-fatigue of Sn-8Zn-3Bi solder in proportional and non-proportional loadings. Push-pull and reversed torsion tests were carried in proportional test using fast-fast, slow-fast, fast-slow, slow-slow and strain-hold waves. Non-proportional tests were also carried out using box, step and circle strain waves. In proportional test, smallest creep-fatigue lives were observed in push-pull slow-fast test. Creep-fatigue lives in reversed torsion test were longer by a factor of 2 than those in push-pull test compared with the same strain wave. Non-proportional loading reduced the creep-fatigue life. Circle strain wave showed the smallest fatigue life in non-proportional loading. A non-proportional strain proposed by the authors correlated all the proportional and non-proportional fast-fast data within a factor of two scatter band.

Effect of Strain Wave on Multiaxial Creep-Fatigue Life for Sn-8Zn-3Bi Solder

2003 ◽  
Vol 2003 (0) ◽  
pp. 401-402
Author(s):  
Hiroshi SASAKI ◽  
Takaei YAMAMOTO ◽  
Takamoto ITOH ◽  
Masao SAKANE ◽  
Yutaka TSUKADA ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Strain Wave ◽  
Creep Fatigue ◽  
Multiaxial Creep

Creep-Fatigue Life Assessment Under Multiaxial Strain State

2006 ◽  
Author(s):  
Shengde Zhang ◽  
Masao Sakane ◽  
Takamoto Itoh
Keyword(s):  
Fatigue Life ◽  
Biaxial Tension ◽  
Creep Damage ◽  
Strain Ratio ◽  
Life Assessment ◽  
Principal Strain ◽  
304 Stainless Steel ◽  
Strain Wave ◽  
Element Analysis ◽  
Creep Fatigue

This paper studies the multiaxial creep-fatigue life for type 304 stainless steel at elevated temperature. Strain controlled biaxial tension-compression creep-fatigue tests were carried out using cruciform specimens under four strain waves at three principal strain ratios. The strain wave and the principal strain ratio had a significant effect on creep-fatigue life of the cruciform specimen. The creep-fatigue life ratio decreased as the principal strain ratio increased which indicates that larger creep damage occurred at larger principal strain ratio. The effects of the strain wave and principal strain ratio were discussed in relation to the observations of surface crack and void area density in the gage part of the specimen. Creep-fatigue lives were discussed in relation to the principal stress amplitude calculated by finite element analysis and creep-fatigue damage was evaluated by linear damage rule.

A Strain Rate Ratio Approach for Assessing Creep-Fatigue Life of 63Sn-37Pb Solder Under Shear Loading

2004 ◽  
Vol 127 (4) ◽  
pp. 407-414 ◽  
Author(s):  
Yutaka Tsukada ◽  
Hideo Nishimura ◽  
Hiroki Yamamoto ◽  
Masao Sakane
Keyword(s):  
Fatigue Life ◽  
Strain Rate ◽  
Rate Ratio ◽  
Life Prediction ◽  
Strain Range ◽  
Shear Loading ◽  
Strain Waves ◽  
Creep Fatigue ◽  
Ratio Approach ◽  
Damage Rule

This paper studies creep-fatigue life prediction under shear loading by making extensive torsion creep-fatigue experiments using four kinds of strain waves. The linear damage rule, strain range partitioning method, frequency modified fatigue life, and ductility exhaustion model were applied to the experimental data, but no methods accurately predicted the creep-fatigue life. A new method based on the strain rate ratio, which predicted the creep-fatigue life within a factor of 4 scatter band, was developed.

scholarly journals Fatigue Property of Additively Manufactured Ti-6Al-4V under Non-proportional Multiaxial Loading

2021 ◽  
Author(s):  
Yuya Kimura ◽  
Fumio Ogawa ◽  
Takamoto Itoh
Keyword(s):  
Fatigue Strength ◽  
Crack Propagation ◽  
Strain Path ◽  
Low Cycle Fatigue ◽  
Fatigue Property ◽  
Strength Properties ◽  
Fatigue Tests ◽  
Multiaxial Loading ◽  
Proportional Loading ◽  
Strain Paths

Abstract Low cycle fatigue strength properties of additively manufactured Ti-6Al-4V alloy were experimentally investigated under proportional and non-proportional multiaxial loading. Fatigue tests have been conducted by means of hollow cylinder specimens with and without heat treatments, at room temperature in air. Fatigue tests with proportional loading represented by a push-pull strain path and non-proportional loading represented by a circle strain path were conducted, respectively. The fatigue lives of additively manufactured specimens were drastically reduced obviously by internal voids and defects in comparison with the specimens used in the previous study [1]. In addition, the defect size is measured, and the defect does not cause fatigue strength reduction above some size. The fracture surface was observed using SEM to investigate fracture mechanism of additively manufactured specimens under two types of strain path. Different fracture patterns are recognized for the two strain paths; however, both showed the retention of the crack propagation in spite of the presence of numerous defects. The crack propagation properties of the materials with numerous defects under non-proportional multiaxial loading were elucidated to increase the reliability of additive manufactured components.

scholarly journals Fatigue life of propulsion shafts: direct calculation as per modern methods

2020 ◽  
Vol S-I (2) ◽  
pp. 68-71
Author(s):  
V. Platonov ◽  
◽  
A. Filatov ◽  
Keyword(s):  
Numerical Simulation ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Direct Calculation ◽  
Critical Plane ◽  
Proportional Loading ◽  
Plane Method ◽  
Critical Stresses ◽  
Modern Methods ◽  
Fatigue Model

This study is an alternative FEM-based fatigue strength calculation for propulsion shafts as per RS Rules. Direct numerical simulation yielded the fields of stresses and strains. Lifetime assessment was based on S-N fatigue model: critical stresses for this model were obtained as per critical-plane method taking into account non-proportional loading of propulsion shafts. It compares two shaft designs: in compliance with RS Rules and with deviation from them.

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