Abstract
This work presents an advanced finite element model that can be used to investigate and understand the highloadingrate bridging mechanisms of zpins. A group of plylevel meshes are used to consider the microstructures of zpin array reinforced laminates. Resin matrix is described by an elastoplastic model that is dependent on both hydrostatic pressure and loading rate. The interface between the zpin and the laminate is described by a coupled cohesive and friction contact algorithm; a friction term is added on top of Coulomb friction to consider the singularities and roughness of zpin and hole surfaces, which are difficult to mesh out by finite elements. To improve computational efficiency, each zpin is described by a homogenised mesh and a nonlinear shear constitutive law to account for the variation of zpin bending stiffness due to splitting. Rupture of zpin is described by the maximum tensile stress criterion with the tensile strength described by the Weibull criterion. The model was preliminarily applied to simulate the mode I high rate bridging behaviour of a 4 × 4 T300/BMI composite zpin array when inserted in a quasi isotropic laminate. The numerical model has successfully captured zpin/laminte debonding and frictional pullout.
Original language  English 

Title of host publication  ECCM18 Proceedings 
Publication status  Published  2018 
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HPC (High Performance Computing) and HTC (High Throughput Computing) Facilities
Sadaf R Alam (Manager), Steven A Chapman (Manager), Polly E Eccleston (Other), Simon H Atack (Other) & D A G Williams (Manager)
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