EAGER: Damage Evolution at the Fiber-Matrix Interphase for Early Failure Characterization in Composites

EAGER：纤维-基体界面处的损伤演化，用于复合材料早期失效表征

• 批准号: 1649481
• 负责人: Raman Singh
• 金额: $ 9.96万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-15 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1649481&HistoricalAwards=false
• 关键词: EAGER; Damage; Evolution; Fiber; Matrix

This EArly-concept Grant for Exploratory Research (EAGER) award supports fundamental research to understand how fatigue failure originates at the interaction between fibers and matrix in a composite material. Composites are materials made from more than one component, such as carbon or glass fibers placed in a plastic matrix. Such materials are used in several applications including aircraft, automobiles, bridges, and even golf clubs. Unfortunately, composite materials can fail catastrophically with little warning when subjected to cyclic loading. This is known as fatigue failure and can be very difficult to predict. By understanding how this failure originates and grows over time it will become possible to make better predictions about how long something made from composites can survive before breaking. This will make composites safer and cheaper to use, save lives, and benefit the US economy. This project will also help broaden the participation of traditionally groups in science and engineering. This research focuses on a fundamental characterization of the micro- and nano-scale deterioration, damage, and failure mechanisms that occur at the fiber-matrix interface and within the interphase region of polymer matrix composite materials. These measurements could then be used to develop mechanics-based design tools that incorporate the effects of fiber-surface modification on the fatigue life and durability of composites. The research is driven by the development of recent tools that enable such direct measurements at spatial resolutions of `tens of nanometers'. This investigation also leads to a more comprehensive project to develop a multi-scale damage-based approach for modeling the long-term durability of fiber-reinforced composites.

这一早期概念探索性研究(AGIRE)奖支持基础研究，以了解疲劳失效是如何在复合材料中纤维和基质之间的相互作用中产生的。复合材料是由不止一种成分组成的材料，例如放置在塑料基质中的碳或玻璃纤维。这种材料被用于多种应用，包括飞机、汽车、桥梁，甚至高尔夫球杆。不幸的是，复合材料在承受循环载荷时可能会在几乎没有警告的情况下灾难性地失效。这就是所谓的疲劳失效，可能很难预测。通过了解这种故障是如何产生和随着时间的推移而增长的，就有可能更好地预测由复合材料制成的东西在断裂之前还能存活多久。这将使复合材料的使用更安全、更便宜，拯救生命，并使美国经济受益。该项目还将有助于扩大传统群体在科学和工程领域的参与。本研究主要研究发生在聚合物基复合材料界面和界面区域的微纳尺度的劣化、损伤和破坏机制。然后，这些测量结果可用于开发基于力学的设计工具，其中包含纤维表面改性对复合材料疲劳寿命和耐久性的影响。这项研究是由最近工具的发展推动的，这些工具能够以“几十纳米”的空间分辨率进行这种直接测量。这项研究还导致了一个更全面的项目，开发了一种基于多尺度损伤的方法来模拟纤维增强复合材料的长期耐久性。