Fatigue Life Estimation of Solder Joints in SMT-PGA Packages

1998 ◽  
Vol 120 (2) ◽  
pp. 207-212 ◽  
Author(s):  
M. Mukai ◽  
T. Kawakami ◽  
Y. Hiruta ◽  
K. Takahashi ◽  
K. Kishimoto ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Thermal Cycle ◽  
Present Method ◽  
Solder Joints ◽  
Surface Mount Technology ◽  
Electronic Components ◽  
Life Estimation ◽  
Creep Stress ◽  
Fatigue Life Estimation ◽  
Material Tests

The fatigue life estimation of solder joints is one of the most critical requirements in the development of reliable electronic components. In this study, we first examined a constitutive model for Sn63-Pb37 solder based on the results of material tests. It was confirmed that the behavior of the solder material can be expressed by the elastic-creep constitutive equations when the strain rate was low. Secondly, elastic-creep stress analysis was carried out for the solder joints of a SMT-PGA (surface mount technology pin grid array) package. The location of the failure predicted by the analytical results agreed well with those of the thermal cycle tests (TCT). It was shown that the fatigue life estimation of solder joints based on the present method is satisfactory for engineering purposes.

scholarly journals Fatigue Life Estimation of Lead-Free Solder Joints Using Viscoplastic-Creep Separate Constitutive Model

2014 ◽  
Vol 3 (4) ◽  
pp. 218-224
Author(s):  
Takeharu HAYASHI ◽  
Hirohiko WATANABE ◽  
Yoshinori EBIHARA ◽  
Tatsuhiko ASAI
Keyword(s):  
Fatigue Life ◽  
Constitutive Model ◽  
Solder Joints ◽  
Lead Free ◽  
Lead Free Solder ◽  
Life Estimation ◽  
Fatigue Life Estimation ◽  
Free Solder

Load Spectrum Compiling and Fatigue Life Estimation of the Automobile Wheel Hub

2020 ◽  
Vol 13 ◽  
Author(s):  
Xintian Liu ◽  
Yang Qu ◽  
Xiaobing Yang ◽  
Yongfeng Shen
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Two Dimensional ◽  
Load Spectrum ◽  
One Dimensional ◽  
Life Estimation ◽  
Load Spectra ◽  
Fatigue Life Estimation ◽  
Program Load Spectrum ◽  
Program Load

Background:: In the process of high-speed driving, the wheel hub is constantly subjected to the impact load from the ground. Therefore, it is important to estimate the fatigue life of the hub in the design and production process. Objective:: This paper introduces a method to study the fatigue life of car hub based on the road load collected from test site. Methods:: Based on interval analysis, the distribution characteristics of load spectrum are analyzed. The fatigue life estimation of one - dimensional and two - dimensional load spectra is compared by compiling load spectra. Results:: According to the S-N curve cluster and the one-dimensional program load spectrum, the estimated range fatigue life of the hub is 397,100 km to 529,700 km. For unsymmetrical cyclic loading, each level means and amplitude of load were obtained through the Goodman fatigue empirical formula, and then according to S-N curve clusters in the upper and lower curves and two-dimensional program load spectrum, estimates the fatigue life of wheel hub of the interval is 329900 km to 435200 km, than one-dimensional load spectrum fatigue life was reduced by 16.9% - 17.8%. Conclusion:: This paper lays a foundation for the prediction of fatigue life and the bench test of fatigue durability of auto parts subjected to complex and variable random loads. At the same time, the research method can also be used to estimate the fatigue life of other bearing parts or high-speed moving parts and assemblies.

Notch fatigue life estimation of Ti-6Al-4V

2021 ◽  
Vol 120 ◽  
pp. 105098
Author(s):  
Camilla Ronchei ◽  
Sabrina Vantadori
Keyword(s):  
Fatigue Life ◽  
Life Estimation ◽  
Fatigue Life Estimation

An Investigation of Cyclic Transient Behavior and Implications on Fatigue Life Estimates

1997 ◽  
Vol 119 (2) ◽  
pp. 161-170 ◽  
Author(s):  
Yanyao Jiang ◽  
Peter Kurath
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Cyclic Hardening ◽  
Transient Behavior ◽  
Fatigue Tests ◽  
304 Stainless Steel ◽  
Deformation History ◽  
Life Estimation ◽  
Fatigue Life Estimation ◽  
Track Deformation

Current research focuses on proportional cyclic hardening and non-Massing behaviors. The interaction of these two hardenings can result in the traditionally observed overall softening, hardening or mixed behavior exhibited for fully reversed strain controlled fatigue tests. Proportional experiments were conducted with five materials, 304 stainless steel, normalized 1070 and 1045 steels, and 7075-T6 and 6061-T6 aluminum alloys. All the materials display similar trends, but the 304 stainless steel shows the most pronounced transient behavior and will be discussed in detail. Existing algorithms for this behavior are evaluated in light of the recent experiments, and refinements to the Armstrong-Frederick class of incremental plasticity models are proposed. Modifications implemented are more extensive than the traditional variation of yield stress, and a traditional strain based memory surface is utilized to track deformation history. Implications of the deformation characteristics with regard to fatigue life estimation, especially variable amplitude loading, will be examined. The high-low step loading is utilized to illustrate the effect of transient deformation on fatigue life estimation procedures, and their relationship to the observed and modeled deformation.

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