Mechanical performance of polystyrene foam (EPS): Experimental and numerical analysis
Mechanical performance of polystyrene foam (EPS): Experimental and numerical analysis
复制标题
聚苯乙烯泡沫 (EPS) 的机械性能：实验和数值分析
DOI：
10.1016/j.polymertesting.2018.12.001
复制
发表时间：
2019-02-01
期刊：
影响因子：
5.1
通讯作者：
Xiao, Rui
中科院分区：
文献类型：
--
作者：
Tang, Ninghan;Lei, Dong;Xiao, Rui
在这项工作中，我们进行了一系列测试来表征聚苯乙烯泡沫（EPS）的机械性能，包括单轴压缩测试、单轴拉伸测试和三点弯曲测试。当加载模式从压缩变为拉伸时，EPS 表现出延性到脆性的转变。拉伸时的弹性模量比压缩时测量的弹性模量大近一个数量级。数字图像相关（DIC）技术用于测量应变分布。在单轴变形测试中可以观察到均匀变形，其中 EPS 表现出接近于零的泊松比。对于三点弯曲试验，DIC 可以捕获具有预制裂纹的试样的应变局部化行为。根据实验观察，开发了一个简单的现象学模型，并进一步实施用于有限元分析。模拟结果显示与弯曲试验中实验测量的应变分布相当吻合。
In this work, we perform a series of tests to characterize the mechanical properties of polystyrene foam (EPS), including uniaxial compression tests, uniaxial tension tests and three point bending tests. EPS exhibits a ductile to brittle transition when the loading mode changes from compression to tension. The elastic modulus in tension is nearly one order larger than that measured in compression. The digital image correlation (DIC) technique is used to measure the strain distribution. A homogenous deformation can be observed in uniaxial deformation tests, where EPS exhibits a near-zero Poisson's ratio. For the three point bending tests, DIC can capture the strain localization behavior of specimens with a prefabricated crack. Based on the experimental observations, a simple phenomenological model is developed and further implemented for finite element analysis. The simulation results show reasonable agreement with experimentally measured strain distribution in the bending tests.