Dynamic Yield Strength of Mild Steel under Impact Loading

Defence Science Journal

R. Kumar¹  Manjit Singh¹  R. K. Gupta¹  D. Sood¹  Thomson Mathew¹  Bhupinder Sewak¹  A. C. Sharma¹  P. C. Gautam¹ 

[1] Terminal Ballistics Research Laboratory, Chandigarh

关键词: Ball impact;    gas gun;    flash ray;    crater growth;    strain rate;    dynamic yield strength;    autodynsimulation;    strength model;    Eulerian solver;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Dynamic yield strength of mild steel is estimated when impacted by the steel balls launchedby two stage-light gas gun in the velocity region 1900-5200 m/s. The ball impact provides a radialmomentum to the target material resulting in a crater which spreads out until it is stopped bythe target yield strength. The dynamic yield strength of target metal is calculated by incorporatingthe densities of ball and target material along with experimentally measured crater radius andimpact velocity in modified Bernoulli™s equation. The dynamic yield strength of mild steel hasbeen found to be around 2000 MPa under high velocity impact, causing the material to deformat strain rates > 106 s-1. Impact phenomenon was also simulated on Autodyn 2-D using Eulerprocessor. Simulation results reveal that the target material is subjected to the highest strain rateof 105 - 106 s-1 at the impact point and then decreases as the penetration progresses through thetarget. Predicted results of crater radius depth, and splash of material match with the experimentalmeasurements.

【 授权许可】

Unknown