大规模挤出增材制造中的结晶动力学:带有和没有温度改变的分析
Dominik Leubecher1, Steffen Brier2, Pablo Vitale1
1Institute of Lightweight Engineering, University of the Bundeswehr Munich, 85577 Neubiberg, Germany.
Materials (Basel, Switzerland)
|May 25, 2024
概括
在大型材料挤出 (LS-MEX) 中控制热量是防止元件崩和定制材料性能的关键. 本研究使用模拟来展示调整过程参数和使用修改单元如何精确地管理热谱和结晶动力学.
科学领域:
- 制造业 工程 制造工程
- 材料科学 材料科学 材料科学
- 聚合物加工 聚合物加工
背景情况:
- 大规模材料挤出 (LS-MEX) 提供了新的制造能力,但面临着保留热量的挑战.
- 过度的热量会导致链条强度不足,导致"倾斜",并影响微观结构变化,如结晶动力学.
- 这些热效应会影响最终产品的宏观性质,包括强度和刚度.
研究的目的:
- 研究热能对大型材料挤出中的结构过程的影响.
- 探索用于控制挤出材料的热谱和微观结构变化的方法.
- 为了将受控的热力学与宏观材料性能的有针对性的修改相关联.
主要方法:
- 对聚胺6用40%碳纤维 (PA6重量%40 CF) 进行大规模材料挤出工艺的数值模拟.
- 应用半经验方法,特别是中村模型,用于分析结晶动力学.
- 热模拟与结晶分析的整合,以预测材料的行为.
主要成果:
- 调整工艺参数和使用修改单元可以准确控制材料的热谱.
- 实现了对微观结构过程的精确控制,特别是结晶动力学.
- 该研究确定了绝对结晶度,显示了从线程的外部接口向印刷床的增加.
结论:
- 控制热能对于减轻滑落和提高LS-MEX的部件质量至关重要.
- 将热模拟与半经验模型相结合,提供了一种可靠的方法来预测结晶动力学.
- 这些发现使得通过在LS-MEX过程中管理热动力学,可以对宏观材料特性进行有针对性的修改.
相关概念视频
Recrystallization: Solid–Solution Equilibria
1.1K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.1K
Crystal Growth: Principles of Crystallization
1.8K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
1.8K
Polymer Classification: Crystallinity
2.8K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K


