应变强化的弹性体具有胀的内含物.
Stefanie Heyden1, Robert W Style1, Eric R Dufresne1
1Department of Materials, ETH Zürich, 8093 Zürich, Switzerland. stefanie.heyden@mat.ethz.ch.
Soft matter
|June 5, 2023
概括
不同质的膨胀弹性体,具有微凝颗粒,表现出可调节的机械性能. 它们的刚性取决于粒子膨胀,矩阵变形和粒子相互作用,使新的材料设计成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 固体力学 固体力学是什么
背景情况:
- 不均膨胀的弹性体是复合材料,具有弹性矩阵和包含相 (微凝颗粒或氧化物).
- 这些弹性体的机械性能受到包含阶段的膨胀和脱水的显著影响.
- 在膨胀的状态下,内含物具有可以忽略不计的刚性,并且矩阵变形控制着复合材料的行为.
研究的目的:
- 开发一种基于模型的通用框架,用于使用增量平均场同质化分析不均膨胀的弹性体.
- 计算各种超弹性矩阵材料的宏观有效刚度.
- 扩展弹性刚度地图,以量化不可压缩材料中的局部有效刚度.
主要方法:
- 开发了一个基于超弹性矩阵的增量平均场同质化模型.
- 将弹性刚度图的概念扩展到无法压缩的材料,用于局部刚度量化.
- 将框架应用于对实验数据进行验证的Yeoh材料.
主要成果:
- 该模型准确地预测了不均膨胀的弹性体的有效刚度,包括那些高度膨胀的微凝颗粒.
- 刚度图显示了强烈的辐射硬化和非单调的圆圈方向硬度变化,在应变硬化材料中.
- 根据颗粒膨胀的程度确定了三种不同的复合材料硬度模式:最初的减少,因矩阵硬化而增加,以及由颗粒相互作用驱动的进一步增加.
结论:
- 开发的同质化框架为分析不均膨胀弹性体的机械行为提供了多功能工具.
- 这些发现突出了硬特性对构成模型的敏感性,为设计先进材料提供了潜力.
- 该研究阐明了粒子膨胀,矩阵变形和粒子相互作用之间的复杂相互作用,以确定复合材料的刚性.
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