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.

热塑性基体复合材料是通过将纤维增强热塑性预浸料带层逐渐堆叠和熔合至所需的形状和厚度来制造的。层间粘合强度（产品质量的主要衡量标准）的演变受预浸料表面粗糙度变平（称为“紧密接触”过程）所产生的界面接触面积的影响，以及聚合物分子在接触面之间的相互扩散。区域（称为“治疗”）。表面粗糙结构的几何复杂性以及“紧密接触”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化的可靠描述提出了根本性挑战。该项目的总体目标是克服这些障碍。使用表面凹凸轮廓的创新分形表示，微尺度固有的几何复杂性将变得易于处理。这将构成微尺度输运现象模型的基础，用于描述粗糙体扩散和聚合物相互扩散过程。微观尺度过程描述与宏观尺度热和动量传输现象模型的耦合将用于引出对作为过程参数函数的界面键合发展的全面理解。将进行补充实验研究，旨在验证理论发展。