精品文档---下载后可任意编辑U-0.75Ti 合金的动态力学性能及形变与断裂的开题报告摘要：本文讨论了 U-0.75Ti 合金的动态力学性能及形变和断裂行为。采纳冲击实验和拉伸实验的方法，讨论了该合金在不同应变率（$10^2$~$10^4$ s$^{-1}$）下的力学性能，包括应力应变曲线、应力波传播速度、动态硬化效应等。同时，采纳 SEM 对样品在不同应变率下的断口形貌进行了观察和分析。实验结果表明，U-0.75Ti 合金在高应变率下具有明显的动态增强效应和动态硬化效应，应力应变曲线呈现出明显塑性区域和断裂区域。应力波传播速度和动态硬化指数随应变率的增大而增大。SEM 观察结果表明，在高应变率下，样品断裂方式呈现出明显的韧性断裂特征，断口形貌呈现出韧窝和韧纹。综上，U-0.75Ti 合金在高应变率下表现出良好的力学性能和韧性断裂特征，具有广泛的应用前景。关键词：U-0.75Ti 合金；动态力学性能；形变；断裂Abstract:This paper studied the dynamic mechanical properties and deformation and fracture behavior of U-0.75Ti alloy. The mechanical properties of the alloy at different strain rates ($10^2$~$10^4$ s$^{-1}$) were investigated by impact and tensile tests, including stress-strain curve, stress wave propagation speed, dynamic hardening effect, etc. Meanwhile, the fracture morphology of the samples at different strain rates was observed and analyzed by SEM.The experimental results showed that the U-0.75Ti alloy had obvious dynamic strengthening effect and dynamic hardening effect at high strain rates, and the stress-strain curve showed obvious plastic and fracture zones. The stress wave propagation speed and dynamic hardening index increased with the increase of strain rate. SEM observation showed that at high strain rates, the sample fracture mode showed obvious toughness fracture characteristics, and the fracture morphology showed ductile dimples and ductile streaks.精品文档---下载后可任意编辑In summary, U-0.75Ti alloy showed good mechanical properties and toughness fracture characteristics at high strain rates, and had wide application prospects.Keywords: U-0.75Ti alloy; dynamic mechanical properties; deformation; fracture
