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论文类型：期刊论文

发表时间：2019-11-01

发表刊物：INTERNATIONAL JOURNAL OF IMPACT ENGINEERING

收录刊物：EI、SCIE

卷号：133

ISSN号：0734-743X

关键字：Strain rate-dependent enhanced continuum model; Functionally graded composites; Elastic-plastic impact response; Particle size effects

摘要：An enhanced continuum model considering the strengthening of strain rate is developed to explore the particle size-dependent responses of the metal-ceramic functionally graded composite plates subjected to a drop-weight impact. The continuum model explicitly accounts for the effects of geometrically necessary dislocations and strain rate by combining Taylor dislocation model and Johnson-Cook model. The plastic constitutive relation of metal-ceramic FGM is derived from the Tamura-Tomota-Ozowa model subjected to different strain rates. The elastic-plastic impact responses of SiC/Al functionally graded plates with the micron-scale particle sizes and compositional gradient exponents are studied under varied impact velocities. The comparison at the numerical results for the particle size effects in the SiC/Al functionally graded plates and the experimental data reported in references demonstrates validity of the proposed continuum model.