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Investigations on Transport Phenomena Governing Interfacial Bonding Evolution in Thermoplastic Composites

热塑性复合材料中控制界面键合演化的传输现象的研究

基本信息

批准号：
9912093
负责人：
Ranga Pitchumani
金额：
$ 21.99万
依托单位：
University of Connecticut
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2000
资助国家：
美国
起止时间：
2000-09-01 至 2005-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9912093&HistoricalAwards=false
关键词：
Investigations Transport Phenomena Governing Interfacial

项目摘要

Thermoplastic-matrix composites are fabricated by incrementally stacking andfusion-bonding layers of fiber-reinforced thermoplastic prepreg tapes to adesired shape and thickness. The evolution of interlaminar bond strength---aprincipal product quality measure---is governed by the development ofinterfacial contact area through flattening of the prepreg surfaceasperities (referred to as the "intimate contact" process), and theinterdiffusion of polymer molecules across the contacted areas (termed"healing"). The geometric complexities of the surface asperity structures,and the mechanistic complexities of the strongly coupled microscaleprocesses of "intimate contact" and "healing" pose a fundamental challengeto a reliable description of interfacial bonding evolution duringprocessing. The overall goal of the project is to overcome theseimpediments. The inherent geometric complexities of the microscale will berendered tractable using an innovative fractal representation of surfaceasperity profiles. This will form the basis of microscale transportphenomena models to be developed for describing the asperity spreading andpolymer interdiffusion processes. A coupling of the microscale processdescription with the macroscale heat and momentum transport phenomena modelswill be used to elicit a comprehensive understanding of interfacial bondingdevelopment as function of the process parameters. Complementaryexperimental studies will be conducted aimed at validating the theoreticaldevelopments.

热塑性基复合材料是通过将纤维增强热塑性预浸料带逐渐堆叠和熔接到所需的形状和厚度来制备的。层间结合强度的演变——产品质量的主要衡量标准——是由预浸料表面粗糙度的变平（称为“亲密接触”过程）和聚合物分子在接触区域的相互扩散（称为“愈合”）所形成的界面接触区域的发展所决定的。表面粗糙结构的几何复杂性，以及“亲密接触”和“愈合”强耦合微尺度过程的机械复杂性，对加工过程中界面键合演变的可靠描述提出了根本性的挑战。该项目的总体目标是克服这些障碍。使用表面粗糙度剖面的创新分形表示，将使微观尺度固有的几何复杂性变得易于处理。这将形成用于描述粗糙扩散和聚合物相互扩散过程的微尺度传输现象模型的基础。微观尺度的过程描述与宏观尺度的热量和动量传输现象模型的耦合将被用来全面理解界面键合的发展作为过程参数的函数。将进行旨在验证理论发展的补充实验研究。