A modified split Hopkinson tension bar (SHTB) apparatus was used to investigate the dynamic tensile mechanical response of porcine muscles. A hollow aluminum alloy transmission bar and a semiconductor strain gauge were used to enhance the weak signal from porcine muscles. A ring-shaped copper pulse shaper was used to achieve stress equilibrium and constant approximate strain rates in the specimens. The thin muscle specimen, fixed by 3D-printed clamps, was warped around the bar ends to minimize the radial inertial effect during tensile loading. The quasi-static tests at strain rates of 0.1 s^∧-1 were also conducted on a universal material testing machine to investigate the strain rate dependence. The true stress-strain curves of porcine muscle tissues along the fiber direction were determined at approximate strain rates of 800 s^∧-1, 2000 s^∧-1, and 3000 s^∧-1. The experimental results show that the porcine muscle exhibits nonlinear, rate-sensitive, and orthotropic behavior. The Mooney–Rivlin model with two material constants was sufficient to represent the tensile response of porcine muscles at each strain rate. The rate-dependent Fields–Backofen model can describe the high strain rate response of the porcine muscles.

一种改进的分裂霍普金森张力杆（SHTB）仪器用于研究猪肌肉的动态拉伸机械反应。中空的铝合金传动杆和半导体应变仪用于增强来自猪肌肉的微弱信号。使用环形铜脉冲整形器在样品中实现应力平衡和恒定的近似应变率。用3D打印的夹具固定的薄肌肉样本在钢筋末端弯曲，以最大程度地减小拉伸载荷期间的径向惯性效应。在0.1秒的应变速率的准静态测试^∧在通用材料测试机上还进行了-1，以研究应变率依赖性。沿纤维方向的猪的肌肉组织的真应力-应变曲线，在800个小号近似应变率确定^∧ -1，2000年第^∧ -1，3000小号^∧ -1。实验结果表明，猪肌肉表现出非线性，速率敏感和正交各向异性行为。具有两个材料常数的Mooney-Rivlin模型足以表示每种应变率下猪肌肉的拉伸响应。速率依赖的Fields-Backofen模型可以描述猪肌肉的高应变速率响应。