The Proceedings of Conference of Kanto Branch
Online ISSN : 2424-2691
ISSN-L : 2424-2691
2013.19
Session ID : 20305
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20305 Implicit Time-Integration for Viscoplastic-Creep Separate Constitutive Model
Takeharu HAYASHIYoshinori EBIHARATatsuhiko ASAIHirohiko WATANABE
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Abstract
When we estimate the fatigue life of lead-free solder joints, we have to conduct FE analysis using a constitutive model which can exhibit mechanical properties of lead-free solder. Previously, we proposed a separate type viscoplastic-creep constitutive model which can describe stress strain curves, stress strain hysteresis loops and stress relaxation curves, with these temperature dependencies and these rate dependencies. In this study, we time-integrated the model implicitly with the Owen and Hinton integration scheme in contrast to our previous explicit time-integration. We implemented the algorithm into finite element analysis code ABAQUS via its user material subroutine UMAT. We analyzed the previous conducted material tests by large width of step-time using the developed program. It was confirmed that the convergency of analysis was improved.
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© 2013 The Japan Society of Mechanical Engineers
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