Ballistic impact behaviour of newly developed armour grade steel: An experimental and numerical study. (June 2020)

• Record Type: Journal Article
• Authors: Choudhary, Shashank; Singh, Pundan Kumar; Khare, Sangeeta; Kumar, Krishna; Mahajan, Puneet; Verma, Rahul Kumar
• Is Part Of: International journal of impact engineering. Volume 140(2020)
• Publication Date: 2020-06
• Subjects: Ballistic impact -- Failure criteria -- Modified Johnson-Cook -- Cockcroft-Latham -- LS DYNA; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2020.103557
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: Ballistic impact test of a newly developed armour grade steel. Quasi-static, high strain rate and elevated temperature experiments for material models parameters determination. Numerical simulations in LS-DYNA explicit for NIJ Level 3 standards. Comparison and validation of four different fracture criteria namely modified Johnson-Cook (MJC), Cockcroft-Latham (CL), maximum shear stress (MS) and constant failure strain (CFS) with experimental test. Back-face deformation of MJC, CL and CFS fracture criteria in close agreement with experiment. Abstract: High strength steel plates are majorly utilized for civil and military vehicles for ballistic protection against various threat levels. In this work, an experimental and numerical study has been conducted on a newly developed armour steel grade. Four different ductile fracture criteria have been used in the numerical simulations, namely Modified Johnson-Cook (MJC), Cockcroft-Latham (CL), Constant failure strain (CFS) and Maximum Shear (MS) stress failure criteria. Suitable experiments were conducted for material model parameter estimation and a simulation study was conducted in LS-DYNA to evaluate its performance in a plate impact simulation. The results were correlated with an actual Impact test done with a plate of dimension 1000 × 1000 × 6 mm with 7.62 × 51 mm NATO ball ammunition for NIJ (National Institute of Justice) Level 3 protection. Modified Johnson-Cook, Cockcroft-Latham and Constant strain failure criteria are in good agreement with experimental results. Maximum Shear stress failure criteria failed to predict the experimental results.