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首页> 外文会议>International Conference on High Performance Structures and Materials >Mechanical characterisation of a viscous-elastic plastic material, sensitive to hydrostatic pressure and temperature
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Mechanical characterisation of a viscous-elastic plastic material, sensitive to hydrostatic pressure and temperature

机译：粘性弹性塑料材料的机械表征，对静液压压力和温度敏感

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This paper deals with the characterization of the static mechanical behaviour of an energetic material. Due to the constituents (crystals and a polymeric binder), the behaviour is influenced by the pressure, the temperature and the strain rate. The temperature, considered varying slowly, is a parameter and the computational problems are uncoupled. Therefore, a complete experimental protocol and a model have been developed. Inspired from the Visco-Scram model, the behaviour is described using a general Maxwell model in which all the branches are affected by an isotropic damage. The first branch takes into account elastic-plastic behaviour. The yield stress is given by a parabolic criterion, characterized using compressive, tensile and tri-axial tests. The hardening is isotropic and the plastic flow rule is nonassociated. The other branches are viscoelastic. A genetic algorithm is used to optimise the viscoelastic parameters, previously obtained using DMA measurements. Comparisons between the model and experiments are proposed for different temperatures, strain rates and pressures. At last, a user material subroutine has been developed in Abaqus Standard and finite element computations of the Brazilian test are compared to the experimental response.
机译：本文涉及能量材料静态力学行为的表征。由于成分（晶体和聚合物粘合剂），该行为受压力，温度和应变率的影响。认为温度缓慢地变化，是一个参数，计算问题是解耦的。因此，已经开发了完整的实验方案和模型。从Visco-Scram模型的启发，使用一般麦克斯韦模型来描述该行为，其中所有分支受到各向同性损坏的影响。第一分支考虑到弹性塑性行为。屈服应力由抛物线标准给出，其特征在于使用压缩，拉伸和三轴试验。硬化是各向同性的，塑料流量规则是非分配的。另一个分支是粘弹性的。遗传算法用于优化使用DMA测量获得的粘弹性参数。提出了模型和实验之间的比较，用于不同的温度，应变速率和压力。最后，在ABAQUS标准中开发了一个用户材料子程序，并将巴西测试的有限元计算与实验响应进行了比较。

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