Dynamic Multi-Axial Loading Response and Constitutive/Damage Modeling of Titanium and Titanium Alloys

摘要

Specific aims of the project were to determine response of several economical Ti-6Al-4V alloys under quasi-static and dynamic compression and torsion loading over a wide range of strain-rates and temperatures, and constitutive/damage modeling of the measured response for implementation in computer codes for penetration simulation. During the three funding periods, response of several of these alloys (material provided by Army Research Lab., Aberdeen) were determined under compression and torsion loading over a wide range of strain-rates (10(caret -6) to 10(caret 3) per sec.) and temperatures (755-200 K). Material constants were determined for the Johnson-Cook (JC) and Khan-Huang- Liang (KHL) models. Multi-axial experiments were then performed and observations were compared to predictions from JC and KHL models. It has been clearly demonstrated that KHL model predicts the observed response of the material far superior than JC model. These findings are significant and KHL model is ready for incorporation in computer codes of the US Army for penetration simulations regarding light-weight tank design. Microstructures and anisotropy in the material were also studied. Results achieved are presented in three executive summaries, while details of these results are provided in three appendices which are actually three papers, either already published or are in print in a leading journal.