A Modified Strain-Rate-Dependent Spring-Mass Model for Response Prediction of Composite Laminates Subjected to Low-Velocity Impact

A modified strain-rate dependent (SRD) spring-mass model was first developed to capture the strain rate effect on response prediction of fiber-reinforced polymer (FRP) laminates subjected low-velocity impact (LVI). The constitutive relations FRP material were with impact-induced using Yen-Caiazzo’s function in space and time dimensions simultaneously. stiffness coefficients updated step-by-step during solving Bubnov-Galerkin equation by variational method, allowing SRD contact history be obtained via recursive integration. expressions under four typical boundary conditions presented. Drop-weight tests corresponding VUMAT-based LVI simulation finite element method (FEM) provided prove validity proposed evaluating composites. Further parameter studies carried out investigate reliability for influence reinforced fibers different dependency response. lumped has been proven more efficient than traditional FEM, which can combined some existing damage models accurately analyze delamination evolution process further studies.