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.

Creep-Fatigue Life Evaluation for Sn-3.5Ag Solder

2005 ◽  
Vol 128 (2) ◽  
pp. 142-150 ◽  
Author(s):  
Mineo Nozaki ◽  
Masao Sakane ◽  
Yutaka Tsukada ◽  
Hideo Nishimura
Keyword(s):  
Fatigue Life ◽  
Strain Range ◽  
Grain Boundary Sliding ◽  
Strain Waves ◽  
Life Evaluation ◽  
Creep Fatigue ◽  
Fatigue Life Evaluation ◽  
Boundary Sliding ◽  
Small Scatter ◽  
Damage Rule

This paper studies the creep-fatigue life evaluation of Sn-3.5Ag solder under push-pull loading using fast-fast, fast-slow, slow-fast, slow-slow, and strain-hold strain waves. Extensive creep-fatigue data were generated using these strain waves and the applicability of four conventional creep-fatigue damage rules, the linear damage rule, the frequency modified fatigue life, the ductility exhaustion model, and the strain range partitioning method, was examined. No conventional damage rules evaluated creep-fatigue lives accurately. Only the grain boundary sliding model, developed recently for solders, predicted creep-fatigue lives with a small scatter.

scholarly journals Creep-Fatigue Life Prediction for Ligament of Boiler Headers by Strain Range Partitioning Method.

1999 ◽  
Vol 48 (6) ◽  
pp. 604-609 ◽  
Author(s):  
Hiroyuki HAYAKAWA ◽  
Mituo MIYAHARA ◽  
Akihiro KANAYA ◽  
Kazuo OKAMURA
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Strain Range ◽  
Fatigue Life Prediction ◽  
Creep Fatigue

Creep-Fatigue Properties of Mod.9Cr-1Mo Steel Under Variable Straining

1993 ◽  
Vol 115 (3) ◽  
pp. 235-241
Author(s):  
M. Miyahara ◽  
K. Tokimasa
Keyword(s):  
Type Strain ◽  
Life Prediction ◽  
Strain Range ◽  
Fatigue Properties ◽  
Rate Equations ◽  
Creep Fatigue ◽  
Slow Type ◽  
Damage Rule ◽  
High Test ◽  
Life Prediction Model

Two-step variable straining tests, which included CP- (slow-fast) type and PC- (fast-slow) type tests, were conducted at 600°C in air for Mod.9Cr-1Mo steel. In the tests, CP and PC-type strain range level varied from high to low for the high-low test and from low to high for the low-high test. The deviations of the experimental data from the linear damage rule prediction were observed. These experimental results and the effect of the strain waveform on the creep-fatigue properties under variable straining were well explained by the life prediction model previously proposed by the authors in which the strain range partitioned crack growth rate equations were applied.

A Procedure for Low Cycle Fatigue Life Prediction for Various Temperatures and Strain Rates

1990 ◽  
Vol 112 (4) ◽  
pp. 422-428 ◽  
Author(s):  
Ange Zhang ◽  
T. Bui-Quoc ◽  
R. Gomuc
Keyword(s):  
Fatigue Life ◽  
Strain Rate ◽  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Low Frequency ◽  
Strain Range ◽  
Strain Rates ◽  
Total Strain Range ◽  
Wide Range ◽  
Experimental Values

This paper describes a procedure that permits the calculation of the fatigue life over a wide range of temperatures and strain rates. The isothermal fatigue life is expressed in terms of the total strain range by an equation previously obtained from a continuous damage concept. Additional new terms are introduced to take into account the effect of the temperature and of the strain rate. For a given material, a multiple regression analysis is carried out using some experimental results in order to evaluate the material constants involved. Once these constants are known, the life prediction can be made for other specified values of temperature and strain rate. The approach is applied to available data obtained from several stainless steels (AISI 304, 316, 348, and some SUS materials) under several combinations of temperatures and strain rates. The deviation of the calculated lives from the experimental values is reasonably acceptable. The extension of the proposed procedure to cases of cycling with a very low frequency, usually involving hold times, is examined and discussed.

scholarly journals Creep-fatigue life prediction for modified 9Cr-1Mo steel by linear damage rule.

1990 ◽  
Vol 39 (442) ◽  
pp. 965-969 ◽  
Author(s):  
Masafumi YAMAUCHI ◽  
Toshihide IGARI ◽  
Toshiro MATSUBARA ◽  
Katsuya SETOGUCHI
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Creep Fatigue ◽  
Damage Rule

scholarly journals Characterization of Austenitic Stainless Steels with Regard to Environmentally Assisted Fatigue in Simulated Light Water Reactor Conditions

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 307
Author(s):  
Matthias Bruchhausen ◽  
Gintautas Dundulis ◽  
Alec McLennan ◽  
Sergio Arrieta ◽  
Tim Austin ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Fatigue Life ◽  
Elevated Temperature ◽  
Strain Rate ◽  
Power Plants ◽  
Research Effort ◽  
Hold Time ◽  
Strain Range ◽  
Austenitic Steels ◽  
Mean Strain

A substantial amount of research effort has been applied to the field of environmentally assisted fatigue (EAF) due to the requirement to account for the EAF behaviour of metals for existing and new build nuclear power plants. We present the results of the European project INcreasing Safety in NPPs by Covering Gaps in Environmental Fatigue Assessment (INCEFA-PLUS), during which the sensitivities of strain range, environment, surface roughness, mean strain and hold times, as well as their interactions on the fatigue life of austenitic steels has been characterized. The project included a test campaign, during which more than 250 fatigue tests were performed. The tests did not reveal a significant effect of mean strain or hold time on fatigue life. An empirical model describing the fatigue life as a function of strain rate, environment and surface roughness is developed. There is evidence for statistically significant interaction effects between surface roughness and the environment, as well as between surface roughness and strain range. However, their impact on fatigue life is so small that they are not practically relevant and can in most cases be neglected. Reducing the environmental impact on fatigue life by modifying the temperature or strain rate leads to an increase of the fatigue life in agreement with predictions based on NUREG/CR-6909. A limited sub-programme on the sensitivity of hold times at elevated temperature at zero force conditions and at elevated temperature did not show the beneficial effect on fatigue life found in another study.

Solder Creep-Fatigue Interactions With Flexible Leaded Parts

1992 ◽  
Vol 114 (2) ◽  
pp. 185-192 ◽  
Author(s):  
R. G. Ross ◽  
L. C. Wen ◽  
G. R. Mon ◽  
E. Jetter
Keyword(s):  
Computer Program ◽  
Strain Rate ◽  
Thermal Cycle ◽  
Failure Process ◽  
Strain Range ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Creep Fatigue ◽  
Solder Fatigue

With flexible leaded parts, the solder-joint failure process involves a complex interplay of creep and fatigue mechanisms. To better understand the role of creep in typical multi-hour cyclic loading conditions, a specialized non-linear finite-element creep simulation computer program has been formulated. The numerical algorithm includes the complete part-lead-solder-PWB system, accounting for strain-rate dependence of creep on applied stress and temperature, and the role of the part-lead dimensions and flexibility that determine the total creep deflection (solder strain range) during stress relaxation. The computer program has been used to explore the effects of various solder creep-fatigue parameters such as lead height and stiffness, thermal-cycle test profile, and part/board differential thermal expansion properties. One of the most interesting findings is the strong presence of unidirectional creep-ratcheting that occurs during thermal cycling due to temperature dominated strain-rate effects. To corroborate the solder fatigue model predictions, a number of carefully controlled thermal-cycle tests have been conducted using special bimetallic test boards.

Sign in / Sign up

Export Citation Format

Share Document