The Rate (Time)-Dependent Behavior of Ti-7Al-2Cb-1Ta Titanium Alloy at Room Temperature Under Quasi-Static Monotonic and Cyclic Loading

摘要: Abstract : Uniaxial tests using a servocontrolled testing machine and strain measurement at the gage length were performed on high-strength, low-ductility, Titanium Alloy. Tests involved monotonic cyclic loadings with rates between 2 x 10 to minus 8th power 3rd s 1st power, stress from 100 MPa short-term relaxation creep tests. The inelastic behavior is strongly rate-dependent. Ratchetting shown increase as rate decreases. No strain-rate history effect was found. A unique stress-strain curve ultimately reached for given irrespective of prior long only positive stresses are imposed. In plastic range drop in time period depends preceding test independent actual strain. results qualitatively accordance viscoplasticity theory based total overstress. (Author)