Inelastic material behavior of polymers - Experimental characterization, formulation and implementation of a material model
Inelastic material behavior of polymers - Experimental characterization, formulation and implementation of a material model
复制标题
DOI：
10.1016/j.mechmat.2012.04.011
复制
发表时间：
2012-09-01
影响因子：
3.9
通讯作者：
Ulbricht, Volker
中科院分区：
文献类型：
--
作者：
Kaestner, Markus;Obst, Martin;Ulbricht, Volker
在这方面的贡献的实验程序的基础上位移控制拉伸试验在不同的加载速率，松弛实验和变形控制加载和卸载过程与中间松弛实验表征和分类的非线性，非弹性力学行为的聚合物。这些实验提供了一个结构化的方法参数识别数据。根据实验结果，推导了小应变单轴粘塑性材料模型，并将其推广到多轴加载，编制了有限元程序。实验过程和建议的材料模型的组合，然后用于表征和模拟的热塑性聚丙烯的机械行为。必要的材料参数的识别后，应力-应变曲线已被计算为不同的单轴和多轴载荷，并与实验结果进行比较。(c)2012爱思唯尔有限公司保留所有权利。
In this contribution an experimental procedure based on displacement controlled tensile tests at different rates of loading, relaxation experiments and deformation controlled loading and unloading processes with intermediate relaxations to experimentally characterize and classify the nonlinear, inelastic mechanical behavior of polymers is presented. These experiments provide data for a structured approach to parameter identification. In line with the experiments, a small strain uniaxial viscoplastic material model is derived, subsequently generalized to multiaxial loadings and implemented into a finite element program. The combination of the experimental procedure and the proposed material model is then used to characterize and model the mechanical behavior of the thermoplastic polypropylene. After the identification of the necessary material parameters, stress-strain curves have been computed for different uni- and multiaxial loadings and are compared with experimental results. (c) 2012 Elsevier Ltd. All rights reserved.