GOALI: Fundamental Understanding and Suppression of Microcracking in Three Dimensional Woven Composites During Curing

这个资助机会学术联络与工业（GOALI）项目将提供基本的了解如何在固化过程中的局部应力集中和损伤的形成与编织结构和三维编织复合材料的制造参数。将开发用于预测基体固化期间和使用条件下微裂纹的综合数值模拟工具，并通过实验进行验证。实验研究将在工业环境中专门制造的试样上进行，以支持建模工作，并更好地了解树脂袋开裂的机制。他们将包括使用光学和SEM显微镜，微计算机断层扫描，传统的机械测试，残余应力测定材料去除，和纯树脂的多轴应力测试的微观结构表征。将提出三维机织复合材料的安全设计准则。在树脂固化过程中三维机织复合材料微裂纹的理解和建模的进展将导致制造技术的改进和？裁缝这些材料的各种应用。证明它们可以用廉价的树脂生产而没有微裂纹，将大大扩大它们在航空航天、汽车、地面运输、风能和娱乐海洋工业中的应用。这项工作将在新罕布什尔州大学和奥尔巴尼工程复合材料公司的密切合作下进行，并将通过期刊出版物、会议介绍和两个工业讲习班加以传播。

This Grant Opportunity for Academic Liaison with Industry (GOALI) project will provide fundamental understanding of how local stress concentrations and formation of damage during curing are related to the weave architecture and fabrication parameters of three-dimensional woven composites. Comprehensive numerical modeling tools to predict microcracking during matrix cure and under service conditions will be developed and validated by experiments. Experimental studies will be performed on the specimens specifically fabricated in industrial setting to support the modeling effort and gain a better understanding of the mechanisms of resin pocket cracking. They will include microstructure characterization using optical and SEM microscopy, microcomputed tomography, traditional mechanical testing, residual stress determination by material removal, and multiaxial stress tests on neat resin. Guidelines for safe design of three-dimensional woven composites will be proposed. Advances in understanding and modeling of microcracking in 3D woven composites during resin curing will lead to improvements in technology of manufacturing and ?tailoring? of these materials for various applications. Demonstrating that they can be produced free of microcracks with inexpensive resins will greatly expand their utilization in aerospace, automotive, ground transportation, wind energy, and recreational marine industries. The work will be conducted in close collaboration between the University of New Hampshire and Albany Engineered Composites, Inc., and will be disseminated through journal publications, conference presentations and two industrial workshops.