An Experimental and Numerical Investigation of Particle Morphology Effect on the Elasto-plastic Behavior of Particle-filled Composites
An Experimental and Numerical Investigation of Particle Morphology Effect on the Elasto-plastic Behavior of Particle-filled Composites
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DOI：
10.1007/s12221-022-4382-y
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发表时间：
2022-08-21
影响因子：
2.5
通讯作者：
Eruslu, S. Ozmen
中科院分区：
文献类型：
--
作者：
Cinar, Kenan;Parasiz, Sunal Ahmet;Eruslu, S. Ozmen
在这项研究中，颗粒形状对复合材料的弹塑性响应的影响进行了研究实验和计算。片状、球形、不规则形和棒状玻璃颗粒以各种质量分数（5%、10%、15%）用作环氧基体材料中的填料。对于每一种研究的复合材料，机械性能，如弹性模量，拉伸强度，和拉伸断裂应变确定实验获得的应力-应变曲线。片状和不规则颗粒类型分别给出最大和最小弹性模量值。玻璃颗粒的加入对拉伸强度和拉伸断裂应变有不利影响。就拉伸强度和拉伸断裂应变而言，最差的填充类型是薄片和不规则的填充类型，这是由于在负载条件下这些填料颗粒上存在的尖锐边缘和拐角处的应力集中。另一方面，对于没有尖角的球形填料，脱粘似乎是主要的失效机制。代表性体积元（RVE）的方法是用来确定实验确定的属性，通过有限元法。在该模型中，颗粒和基体组分之间的脱粘通过内聚区模型（CZM）模拟。计算结果与实验结果符合得很好。实验结果和计算分析表明，颗粒的其他形态特征，如颗粒几何形状上的尖角和锐边以及颗粒的表面积与体积比，沿着对颗粒填充复合材料的力学性能有显著影响。
In this study, the influence of particle shapes on the elastoplastic response of composite materials is investigated both experimentally and computationally. Flake, spherical, irregular, and rod type glass particles are used as filler in the epoxy matrix material in various mass fractions: 5, 10, 15 %. For each investigated composite material, mechanical properties such as elastic modulus, tensile strength, and tensile fracture strain are determined by experimentally obtained stress-strain curves. Flake and irregular particle types give the maximum and minimum elastic modulus values, respectively. The addition of glass particles has an adverse effect on the tensile strength and tensile fracture strain. The worst filling types in terms of tensile strength and tensile fracture strain are the flake and the irregular ones due to the stress concentrations at the sharp edges and corners present on these filler particles under loading conditions. On the otherhand, for spherical type fillers that have no sharp corners, debonding seem to be the main failure mechanism. Representative volume element (RVE) approach is utilized to determine experimentally identified properties by means of Finite Element Method. In the model, the debonding among particle and matrix components is simulated through the cohesive zone model (CZM). Computational outputs are quite well compliant with experimental results. Experimental results and computational analysis indicate that along with the aspect ratio, some other morpohological characteristics of particles have a marked effect on the mechanical properties of the particle filled composites, such as presence of sharp corners and edges on the particle geometry and surface area to volume ratio of the particles.