使用速率依赖材料模型预测聚合物材料的机械性质:定制上肢骨架的有限元分析
Syed Hammad Mian1,2, Usama Umer1,2, Khaja Moiduddin1,2
1Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia.
Polymers
|May 11, 2024
概括
这项研究使用材料模型和有限元分析来预测定制形体的3D打印聚合物的机械行为. 这种方法为个性化医疗器械的材料选择提供了具有成本效益和效率的方法.
科学领域:
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 三维打印,特别是化沉积建模 (FDM),允许定制医疗设备,如orthoses.
- 选择合适的FDM聚合物需要了解它们的机械行为,传统上通过资源密集的物理测试来确定.
- 目前用于测试定制形状的方法昂贵且耗时,需要采用替代方法.
研究的目的:
- 分析和比较三种材料模型 (Bergström-Boyce,三网和三网粘性塑料) 的适用性,以预测用于个性化上肢骨架的聚合物材料的机械行为.
- 使用这些材料模型,研究聚乳酸 (PLA),烯 (ABS) 和聚乙烯四甲酸甘醇 (PETG) 的机械性能.
- 开发一种结合理论和实验方法的创新方法,用于预测个性化形的机械特性.
主要方法:
- 用PLA,ABS和PETG的实验数据对Bergström-Boyce (BB),三网 (TN) 和三网粘性塑料 (TNV) 材料模型进行校准.
- 在有限元素 (FE) 分析中应用校准材料模型来模拟和预测定制整形形状的机械行为.
- 理论材料模型与实验验证的整合,用于全面的机械分析.
主要成果:
- 基于实验数据,成功校准了BB,TN和TNV模型的PLA,ABS和PETG.
- 使用校准模型进行FE分析,提供了从这些聚合物制成的定制骨架的机械行为.
- 理论和实验方法的结合证明了其在预测个性化医疗器械材料性能方面的有效性.
结论:
- 该研究成功地建立了一个框架,使用FE分析和校准材料模型来预测个性化形的机械特性.
- 该方法为定制医疗器械制造中的材料选择提供了比传统物理测试更有效,潜在的成本更低的替代方案.
- 这些发现支持使用先进的材料建模和模拟来优化3D打印个性化医疗器械的设计和性能.
相关概念视频
Bending of Members Made of Several Materials
147
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...
147
Members Made of Elastoplastic Material
97
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...
97
Hooke's Law
379
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.
379
Residual Stresses in Bending
164
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
164
Plastic Behavior
196
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...
196


