四川大学学报（自然科学版）2025，Vol.62Issue(6)：1439-1446,8.DOI:10.19907/j.0490-6756.250257
钛合金动态剪切的多尺度模拟与绝热剪切带演化机制研究
Study on multiscale simulation of dynamic shear and evolution mechanism of adiabatic shear band in titanium alloys
摘要
Abstract
To reveal the dynamic failure mechanism of titanium alloys under high strain rates,Ti-10V-2Fe-3Al alloys are studied by integrating JMatPro calculations,the Johnson-Cook(JC)constitutive model,and ABAQUS simulations to investigate the effect of grain size on the dynamic shear behavior and the evolution of Adiabatic Shear Band(ASB).Stress-strain data for the alloys with grain sizes of 1 μm,10 μm,and 100 μm were calculated by using JMatPro,and a JC constitutive equation incorporating the grain-size effects was fitted.Among them,the yield strength parameter A of the alloy with 1 μm grains(1 674.00 MPa)is higher than that of the alloys with 10 μm(1 256.00 MPa)and 100 μm(1 094.00 MPa)grains.Addition-ally,the fine-grained alloy exhibits stronger strain hardening and higher sensitivity to thermal softening.Simu-lation results based on the hat-shaped specimen Split Hopkinson Pressure Bar(SHPB)model constructed in ABAQUS show that:At a low strain rate(8 m/s),no continuous ASB is formed in the alloy with 1 μm grains;whereas at a high strain rate(20 m/s),ASB is formed rapidly in the alloy,with the maximum tem-perature rise exceeding 100 K and the heating duration ranging from 2×10⁻⁵ s to 3×10⁻⁵ s.Notably,the ASB initiates at the edges and corners of the shear zone.This study clarifies the regulatory mechanism of grain size and strain rate on ASB,providing support for the optimization of the dynamic properties of titanium alloys.关键词
钛合金/高熵合金/绝热剪切带/本构方程/有限元Key words
Titanium alloy/High-entropy alloy/Adiabatic Shear Band(ASB)/Constitutive equation/Fi-nite element分类
数理科学引用本文复制引用
王庆武,陈龙庆,刘熙瑶,赵健豪,王昊,梁小冲..钛合金动态剪切的多尺度模拟与绝热剪切带演化机制研究[J].四川大学学报（自然科学版）,2025,62(6):1439-1446,8.基金项目
四川大学-泸州市人民政府战略合作项目(2023CDLZ-7) （2023CDLZ-7）
四川省科技计划项目(2025YFHZ0049) （2025YFHZ0049）
