An experimental investigation is conducted to develop, analytically model, and test a novel facility to obtain the dynamic hydrostatic constitutive properties and behavior of soft materials. The novel facility is an underwater shock tube consisting of two aluminum sections and an optically-clear acrylic section in between, all filled with water. A striker-piston configuration is used to provide an axial shock loading to one end of the assembly. Dynamic pressure sensors provide pressure data along the entire length of the assembly, including at the specimen location in the acrylic section. 3D Digital Image Correlation (DIC) is used in conjunction with high-speed photography to provide full-field deformation data of the specimen to obtain volumetric strain. The mismatch in acoustic impedance between the aluminum and the acrylic sections causes a reduction in the amplitude of the pressure pulse by 33%. The pressure pulse also undergoes appreciable dispersion in the acrylic section. Fluid-structure interaction (FSI) models are considered and applied to understand the dispersion characteristics of the axially propagating pressure pulse. The dynamic hydrostatic constitutive response of closed-cell polyvinyl chloride (PVC) foam is obtained at a volumetric strain rate of 100s⁻¹. The bulk modulus at this strain rate for H130 PVC foam is measured to be 106.97 ± 3.11MPa. This is more than double that of the quasi-static (0.001s⁻¹) value of 46.71 ± 1.91MPa, indicating a strong effect of strain rate on the material's response. The buckling pressure is also found to be strain rate dependent, with the dynamic buckling occurring at 3.09 ± 0.12MPa and quasi-static buckling occurring at 1.39 ± 0.17MPa.

进行了一项实验研究，以开发、分析建模和测试一种新设施，以获得软材料的动态静水本构特性和行为。这个新颖的设施是一个水下冲击管，由两个铝制部分和中间的一个光学透明的丙烯酸部分组成，所有部分都充满了水。撞针-活塞配置用于向组件的一端提供轴向冲击载荷。动态压力传感器提供沿组件整个长度的压力数据，包括在亚克力部分的试样位置。3D 数字图像相关 (DIC) 与高速摄影结合使用，可提供试样的全场变形数据以获得体积应变。铝和亚克力部分之间的声阻抗不匹配导致压力脉冲的幅度降低了 33%。压力脉冲在丙烯酸部分也经历了明显的分散。考虑并应用流固耦合 (FSI) 模型来了解轴向传播压力脉冲的色散特性。闭孔聚氯乙烯 (PVC) 泡沫的动态静水本构响应是在 100s 的体积应变速率下获得的^-1。H130 PVC 泡沫在此应变速率下的体积模量经测量为 106.97 ± 3.11 MPa。这是准静态 (0.001s ^-1 ) 值 46.71 ± 1.91 MPa 的两倍多，表明应变速率对材料响应的影响很大。还发现屈曲压力与应变率有关，动态屈曲发生在 3.09 ± 0.12 MPa，准静态屈曲发生在 1.39 ± 0.17 MPa。