通过化沉积模型生产的功能分级多乳酸-烯-二乙 styrene 的机械行为的数值建模:实验观察
Caglar Sevim1, Umut Caliskan2, Munise Didem Demirbas2
1Department of Mechanical Engineering, Faculty of Engineering, Niğde Ömer Halisdemir University, Nigde 51240, Turkey.
Materials (Basel, Switzerland)
|July 29, 2023
概括
使用化沉积建模 (FDM) 通过增材制造 (AM) 生产的功能分级 (FG) 聚合物材料表现出增强的机械性能. 这项研究突出了FGMs.
科学领域:
- 材料科学 材料科学 材料科学
- 复合材料工程 复合材料工程
背景情况:
- 与传统复合材料相比,功能分级材料 (FGM) 提供了优越的机械性能,比如提高了性和抗变形能力.
- 增材制造 (AM) 为制造具有量身定制材料梯度的复杂FG结构提供了一个新的途径.
研究的目的:
- 用化沉积建模 (FDM) 方法研究功能分级 (FG) 聚合物材料的生产.
- 分析层厚度,体积比和总厚度对FG结构机械行为的影响.
- 为了将实验拉伸试验结果与ASTM D638标准进行比较,并验证有限元素方法 (FEM) 数值模型.
主要方法:
- 使用FDM与烯二丁烯 (ABS) 和聚乳酸 (PLA) 制造FG聚合物结构.
- 根据ASTM D638.8的FG结构的拉力测试.
- 使用单层样本进行实验数据验证的FEM数值模型的开发.
主要成果:
- 该研究表明,通过FDM产生的FG结构表现出改善的机械行为.
- 层厚度,体积比率和总厚度的变化显著影响FG材料的机械反应.
- 在与ASTM标准相关的情况下,考虑了AM工艺中固有的几何差异.
结论:
- 增材制造,特别是FDM,是生产具有增强机械性能的FG聚合物材料的可行方法.
- 这些发现有助于理解AM过程参数与FGM机械性能之间的关系.
- 经过验证的FEM模型可以用于进一步优化和预测FG结构行为.
相关概念视频
Members Made of Elastoplastic Material
121
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...
121
Plastic Deformations
110
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
110
Polymer Classification: Architecture
2.8K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.8K
Molecular Weight of Step-Growth Polymers
2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K


