Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-02-01

Journal: JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY

Included Journals: EI、SCIE

Volume: 30

Issue: 2

Page Number: 661-665

ISSN: 1738-494X

Key Words: Hot isotropically processed; Casting titanium alloy (Ti-6Al-4V); Dynamic response; Split-Hopkinson pressure bar; Johnson-Cook model

Abstract: Split-Hopkinson pressure bar (SHPB) was adopted to study the dynamic response of a specifically designed Hot isotropically processed (HIP) Casting Titanium alloy (Ti-6Al-4V). The strain-stress curves were obtained in a range of strain rate (10(-3)similar to 2.6x10(3)/s) to study the constitutive relationships and the Johnson-Cook model is developed to describe this dynamic constitutive law. It can be found that the static microstructure of this specific HIP casting Ti-6Al-4V is lamellar structure. When the loading increases (strain rate higher than 10(3)/s), this lamellar structure changes to basket weave structure, which further changes the mechanical strength and plasticity.