Abstract
Polymethyl-methacrylate (PMMA) has a strong rate-dependency and visco-elastic constitutive characteristics under dynamic conditions. To describe the dynamic characteristics of PMMA with peridynamics, some basic concepts of dynamic viscoelasticity from the local theory are introduced. In particular, a reformulated rate-dependent visco-elastic peridynamic model is proposed, in which the rate and viscous effects, as well as the rate-sensitivity of damage evolution, are reflected. To verify the proposed model for PMMA failure, two examples, a creep-recovery test under quasi-static conditions, as well as a dynamic test of a bar under different strain rates, are investigated. Further, the proposed model is employed to simulate several typical PMMA impact examples: a falling-weight impact test and a bird strike test. The results show reasonable agreements with experimental tests. The comparison of experimental and numerical results indicates that the proposed peridynamic model has the capability of capturing the dynamic response of PMMA under impacting loads.
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