Estimation of Plastic and Creep Strain Development of SAC Solder under Cyclic Loading by Using Stepped Ramp Waves

Abstract:

The fatigue tests under both loading conditions of the Fast-Slow and the Slow-Fast were conducted to discuss validity of an inelastic strain analysis method which was proposed previously. The development behaviors of plastic and creep strains during the tests were analyzed by employing the stepped ramp wave (SW) loading. Using the analysis results, the difference of the development behaviors of plastic and creep strains between the Fast-Slow condition and the Slow-Fast condition was clarified. Then, the fatigue failure surfaces obtained from the tests were observed by using SEM to clarify the difference of the fracture surface between the Fast-Slow condition and the Slow-Fast condition. By correlating the aspect of fracture surface with the development behavior of plastic and creep strain, the validity of the proposed inelastic strain analysis method was discussed.

• Periodical: Key Engineering Materials (Volume 725)
• Pages: 305-310
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.725.305
• Online since: December 2016
• Authors: Ken-Ichi Ohguchi*, Katsuhiko Sasakir
• Keywords: Cyclic Loading, Elastic-Plastic-Creep Model, SAC Solder, Stepped Ramp Wave

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