Release Time:2019-11-06  Hits:

Indexed by: Journal Papers

Date of Publication: 2019-11-01

Journal: INTERNATIONAL JOURNAL OF IMPACT ENGINEERING

Included Journals: SCIE、EI

Volume: 133

ISSN: 0734-743X

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

Abstract: 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.