应用数学和力学2025，Vol.46Issue(5)：650-660,11.DOI:10.21656/1000-0887.450279
低阻抗试样动态加载试验相关问题研究
Study of Dynamic Loading Tests on Low-Impedance Specimens
摘要
Abstract
The key problems of the effective acquisition of low-impedance transmitted signals and the stress e-quilibrium in the Hopkinson bar loading tests on low-impedance specimens with high strain rates,were investi-gated.Based on the previous research fundaments,low-impedance elastic transmitted bars were introduced to replace the traditional metal transmitted bar,the in-situ calibrated semiconductor strain gauge technology was used to amplify weak transmitted signals,and the low-impedance specimens were tested with high precision.Reconstruction and calculation of the stress wave loading process were conducted to get the stress equilibrium history and the influential factors'sensitivity.The trapezoidal incident wave was proposed to realize stress equi-librium and achieve constant strain rate loading on specimens as early as possible.The results show that,low impedance polymethyl methacrylate bars/tubes as transmitted bars along with semiconductor strain gauges can acquire weak signals as low as several Newtons.The stress equilibrium history of the low-impedance specimen depends on the elastic wave velocity.Under the trapezoidal incident wave loading,the stress equilibrium and constant strain rate loading can be achieved at 2 characteristic periods.Based on the design of specimen thick-nesses,the critical effective strain consistency can be achieved under different stress rate loadings.关键词
Hopkinson杆/低阻抗试样/动态加载/应力平衡/透射信号/高应变率Key words
Hopkinson bar/low-impedance specimen/dynamic loading/stress equilibrium/transmitted sig-nal/high strain rate分类
力学引用本文复制引用
殷建平,张晨旭,孙若恒,陈希曦,苗应刚..低阻抗试样动态加载试验相关问题研究[J].应用数学和力学,2025,46(5):650-660,11.基金项目
国家自然科学基金(12472392) （12472392）
陕西省国际科技合作基金重点项目(2023-GHZD-12) （2023-GHZD-12）
中国航空科学基金(2023-GHZD-12) （2023-GHZD-12）
