在3D打印的短纤维增强聚合物中,拉伸和压缩强度的预测和验证
Timothy Russell1, David A Jack1
1Department of Mechanical Engineering, Baylor University, Waco, TX 76798, USA.
Polymers
|September 9, 2023
概括
一种新方法可以预测3D打印碳纤维复合材料的内部强度变化. 这种方法增强了有限元分析,用于在大规模增材制造中准确估计材料属性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 3D打印,特别是大面积增材制造 (LAAM),可以生产大型复合材料组件.
- 短纤维增强聚合物在空间上表现出不同的微结构行为,影响机械性能.
- 准确预测异性质刚性和强度对于可靠的组件设计至关重要.
研究的目的:
- 验证一种方法来预测3D打印的烯丁 styrene (ABS) 复合珠的内部,空间变化的强度特性.
- 开发一个建模框架,以表征局部异型性和强度.
- 将这些本地属性整合到有限元素框架中,用于大规模的财产估计.
主要方法:
- 开发并验证了一种方法,用于预测单个3D打印珠子内的空间变化的机械性能.
- 进行了空间变化的微观结构行为的表征.
- 使用有限元框架来整合局部属性,以便有效地估计硬度和强度.
主要成果:
- 建模框架准确地预测了有效的强度和刚度,与实验数据密切结合.
- 预测有效的纵向压力强度在1%以内,拉伸强度在10%以内.
- 预测有效的纵向压力刚度在3%以内,拉伸刚度在50%以内.
结论:
- 经过验证的方法提供了一种可靠的方法来预测3D打印的短纤维增强聚合物的机械性能.
- 开发的有限元框架允许对LAAM组件进行准确的批量属性估计.
- 这项工作有助于改进增材制造复合结构的设计和性能预测.
相关概念视频
01:30Relation Between Tensile Strength and Compressive Strength of Concrete
241
Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
241
01:16Tensile Strength Considerations of Concrete
151
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
The dimensions and shape of a concrete specimen...
151
01:22Fiber Reinforced Concrete
102
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
102
01:21Plastic Behavior
219
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
219
01:26Hooke's Law
465
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
465
01:25Reinforcements in Concrete
111
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
111