Constitutive modeling of rate dependence and microinertia effects in porous-plastic materials with multi-sized voids (MSVs)
KAUST DepartmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Physical Science and Engineering (PSE) Division
Online Publication Date2012-11-27
Print Publication Date2013-01-01
Permanent link to this recordhttp://hdl.handle.net/10754/594169
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AbstractMicro-voids of varying sizes exist in most metals and alloys. Both experiments and numerical studies have demonstrated the critical influence of initial void sizes on void growth. The classical Gurson-Tvergaard-Needleman model summarizes the influence of voids with a single parameter, namely the void-volume fraction, excluding any possible effects of the void-size distribution. We extend our newly proposed model including the multi-sized void (MSV) effect and the void-interaction effect for the capability of working for both moderate and high loading rate cases, where either rate dependence or microinertia becomes considerable or even dominant. Parametric studies show that the MSV-related competitive mechanism among void growth leads to the dependence of the void growth rate on void size, which directly influences the void's contribution to the total energy composition. We finally show that the stress-strain constitutive behavior is also affected by this MSV-related competitive mechanism. The stabilizing effect due to rate sensitivity and microinertia is emphasized. © 2013 IOP Publishing Ltd.
CitationLiu JX, El Sayed T (2012) Constitutive modeling of rate dependence and microinertia effects in porous-plastic materials with multi-sized voids (MSVs). Modelling Simul Mater Sci Eng 21: 015001. Available: http://dx.doi.org/10.1088/0965-0393/21/1/015001.
SponsorsThis work was fully funded by the KAUST baseline fund. The authors would like to thank the reviewers for their valuable corrections and suggestions. Our thanks are also given to Ms. Lauratu Osu for her careful proofreading.