Evolution of plastic zones in dynamically loaded plates using different elastic–viscoplastic laws
Evolution of plastic zones in dynamically loaded plates using different elastic–viscoplastic laws
复制标题
使用不同的弹粘塑性定律动态加载板中塑性区域的演化
DOI：
10.1016/j.ijsolstr.2004.05.060
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发表时间：
2004
影响因子：
3.6
通讯作者：
M. Stoffel
中科院分区：
文献类型：
--
作者：
M. Stoffel
在粘塑性理论的框架内，发展了许多不同的定律，解释了材料的行为，如蠕变、松弛或过应力的演变。虽然每个模型都能够预测在单轴材料试验中的应力值取决于塑性应变和塑性应变率的问题是，如果模拟的解决方案仍然是现实的，如果粘塑性法律适用于结构变形。在本研究中，应变率敏感金属板受到冲击波。其目的是比较不同的弹粘塑性定律的实验，以确定最合适的材料模型的模拟结果。通过对圆形金属板在冲击波载荷作用下的实验，测量了真实的变形历史。的测量结果进行比较，得到不同的粘塑性定律的模拟结果。其目的是找出每个模型的精度有关的预测的位移，形状形成，传播的塑性区和演变的内弯矩。
In the framework of viscoplastic theory many different laws were developed, accounting for material behaviors like creep, relaxation or evolution of overstresses. Though each model is able to predict in uni-axial material tests the values of stresses depending on plastic strains and plastic strain rates the question is if solutions of simulations are still realistic if the viscoplastic law is applied on structural deformations. In the present study strain rate sensitive metal plates are subjected to shock waves. The purpose is to compare simulation results obtained with different elastic–viscoplastic laws to experiments in order to determine the most appropriate material model. By subjecting circular metal plates experimentally to shock wave loadings realistic deformation histories are measured. The measurements are compared to simulation results obtained with different viscoplastic laws. The aim is to find out the accuracy of each model concerning the predictions of displacements, shape formings, spread of plastic zones and evolutions of inner bending moments.