Experimental study on compaction effects on the ballistic resistance of sandbags

10.1016/j.ijimpeng.2020.103609INTERNATIONAL JOURNAL OF IMPACT ENGINEERING14

Effects of spacing and ply blocking on the ballistic resistance of UHMWPE laminates

10.1016/j.ijimpeng.2021.103824INTERNATIONAL JOURNAL OF IMPACT ENGINEERING15

Modelling delamination migration in angle-ply laminates

This paper presents a numerical study of the delamination migration in angle-ply laminates observed in experiments reported in the literature, where the delamination originally propagates along the lower, 0∘/60∘ interface and later migrates onto the upper, 60∘/0∘ interface. The recently-developed Floating Node Method (FNM) is used for modelling this problem. The initiation and propagation of both delamination and matrix cracks are modelled within the FNM elements. Experimentally-observed phenomena such as the numerous kinking attempts and the multiple onset locations of migration are successfully predicted. The effect of load offset on the locations of migration is captured. In addition, this work tries to shed light on the proper use of standard cohesive elements in cases where delamination migration is expected

Modelling the tensile failure of composites with the floating node method

© 2016 Elsevier B.V.This paper presents the modelling of tensile failure of composites using novel enriched elements defined based on the floating node method. An enriched ply element is developed, such that a matrix crack can be modelled explicitly within its domain. An enriched cohesive element is developed to incorporate the boundaries of matrix cracks on the interface, such that the local stress concentrations on the interface can be captured. The edge status variable approach allows the automatic propagation of a large number of matrix cracks in the mesh. A laminate element is formed, such that a fixed, planar mesh can be used for laminates of arbitrary layups. The application examples demonstrate that the proposed method is capable of predicting several challenging scenarios of composites tensile failure, such as the large number matrix cracks, grip-to-grip longitudinal splits, widespread delamination, explosive splitting and distributed fibre breaking in the 0 plies, etc. The complete failure process of ply-blocked composite laminates, up to the final breaking of the loosened 0° strips, is here firstly reproduced by modelling