Lin Yuan, Fan Jitang, Yu Xinlu, Fu Yingqian, Zhou Gangyi, Wang Xu, Dong Xinlong
Key Laboratory of Impact and Safety Engineering (Ningbo University), Ministry of Education, Ningbo 315211, China.
Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China.
Materials (Basel). 2025 Jan 2;18(1):149. doi: 10.3390/ma18010149.
Obtaining reliable dynamic mechanical properties through experiments is essential for developing and validating constitutive models in material selection and structural design. This study introduces a dynamic tensile method using a modified M-type specimen loaded by a split Hopkinson pressure bar (SHPB). A closed M-type specimen was thus employed. Finite element simulations and experiments were used to validate the design of the M-type specimen, which was fabricated using 17-4PH (precipitation hardening) stainless steel powder with a 3D (three-dimensional) selected laser melting (SLM) printer. After verifying force balance and uniform deformation in the tensile region, tensile tests were conducted across strain rates from quasi-static to a strain rate of 5900 s. The results demonstrated that this method effectively assessed the dynamic tensile behaviors of stainless steel at high strain rates, and achieved both ultra-high strain rates and large plastic deformation.
通过实验获得可靠的动态力学性能对于在材料选择和结构设计中开发和验证本构模型至关重要。本研究介绍了一种动态拉伸方法，该方法使用由分离式霍普金森压杆（SHPB）加载的改进型M型试样。因此采用了封闭的M型试样。通过有限元模拟和实验对M型试样的设计进行了验证，该试样是使用17-4PH（沉淀硬化）不锈钢粉末通过三维选区激光熔化（SLM）打印机制造的。在验证了拉伸区域的力平衡和均匀变形后，在从准静态到5900 s应变率的范围内进行了拉伸试验。结果表明，该方法有效地评估了不锈钢在高应变率下的动态拉伸行为，并实现了超高应变率和大塑性变形。
