Improvement and Application Study of Dynamic Strength Testing Method for Titanium Alloy
Currently,there is no clear standard for dynamic strength testing of titanium alloys,and the requirements for testing equipment and operation processes vary.This may result in significant differences in dynamic compression mechanical results for the same material under different testing systems,or in significant differences in dynamic mechanical results for the same material under the same system.This project plans to use an electronic multimeter and discrete Hopkinson compression rods to perform quasi-static and dynamic loading on titanium alloys,measure their stress-strain curves,and explore their dynamic loading characteristics under high strain rate conditions in combination with microstructure changes.Research has found that titanium alloys exhibit strong rate sensitivity at strain rates ranging from 1100 to 6000 s-1.As the strain rate increases,the rate toughening and plasticizing effects are significant.However,when the strain rate exceeds 4800 s-1,the rate sensitivity and plasticizing effects gradually weaken.At a strain rate of 2500 s-1,the sample exhibits an adiabatic shear line at a 45° angle to the loading direction.As the strain rate increases,a shear band is generated,but not significantly widened,due to the barrier band formed by the dispersed β particle phase slip polymer.
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