Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys Conference Paper uri icon

abstract

  • Strain localization and failure in U‐0.75Ti and Ti‐6Al‐4V alloys were studied in symmetric (rod‐on‐rod) and reverse ballistic (disk‐on‐rod) impact experiments, accompanied by VISAR monitoring of the lateral sample surface velocity. Softly‐recovered samples were metallurgically examined, and the experiments were numerically simulated using an AUTODYN™ 2‐D code. Satisfactory reproduction of both the measured velocity profiles and the results of metallographic examination of the damage produced by adiabatic shearing were obtained by using the Steinberg‐Cochran‐Guinan‐type constitutive equation (calibrated in preliminary planar impact experiments) and the AUTODYN™ built‐in erosion function. A good agreement was found between strains, measured by using natural markers (martensite in U/Ti and texture in Ti64), corresponding to the onset of adiabatic shearing (0.5 – 1.0) and the value of the critical plastic strain used in the simulations as a criterion for triggering the erosion function (0.6 for both alloys). ...

publication date

  • January 1, 2006