碳黑/超高分子量聚乙烯纳米复合材料有效弹性性能的中等尺度模型
Stanislav Buklovskiy1, Kateryna Miroshnichenko1, Igor Tsukrov1
1University of New Hampshire, Durham, NH 03824, USA.
概括
中尺度建模准确地预测了碳黑/聚乙烯纳米复合材料的弹性特性. 模拟与实验数据一致,碳黑含量高达7.5%的重量.
科学领域:
- 材料科学 材料科学 材料科学
- 计算力学 计算力学 计算力学
- 聚合物纳米复合材料 聚合物纳米复合材料
背景情况:
- 碳黑/超高分子量聚乙烯 (CB/UHMWPE) 纳米复合材料正因其导电性质而引起人们的兴趣.
- 了解微观结构和有效弹性特性之间的关系对于材料设计至关重要.
研究的目的:
- 为了预测CB/UHMWPE纳米复合材料的有效弹性特性,使用大尺度数值建模.
- 通过实验测量来验证模型的预测.
主要方法:
- 基于X射线微计算机断层扫描 (micro-CT) 图像的美索尺度数值建模.
- 代表体积元素 (RVE) 的有限元模型的开发,在UHMWPE颗粒周围采用1~2微米厚的含碳层.
- 分析模型的含碳层作为一个双相复合物与球形碳黑含有.
主要成果:
- 微型CT图像显示了碳黑颗粒,在UHMWPE颗粒周围形成了一层,用于测试的重量分数.
- 数字模拟成功预测了在实验置信区间内有效的弹性模块.
- 在碳黑含量高达7.5%的重量级上,可以实现准确的预测.
结论:
- 中等尺度数值建模为预测CB/UHMWPE纳米复合材料有效弹性特性提供了一种可靠的方法.
- 开发的模型,包括微观结构细节,如含碳层,提高预测的准确性.
- 这种方法有助于设计和优化导电聚合物纳米复合材料.
相关概念视频
Bending of Members Made of Several Materials
140
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
140
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
251
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
251
Members Made of Elastoplastic Material
93
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
93
Elasticity in Concrete
87
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
87


