CAREER: Evaluation of Impact Damage under Service Conditions of Fiber Composite Pipes

该研究项目将应用分析、无损和实验技术，以了解复合材料管道在使用条件下的冲击损伤。第一阶段将包括开发一个有限元模型，该模型将包括由结构的使用条件所指示的内部压力的影响。将开发复合材料撞击后的耐久性预测模型，并通过实验测试进行验证。第二阶段将包括对纤维增强复合材料管道进行不同水平冲击能量和内压比的测试程序。在实验阶段，将采用声发射、模态分析和声超声等无损评估技术，收集与撞击后长期加载引起的破坏机制相关的信息。最后阶段将包括对实验结果进行分析简化，以便与第一阶段的预测进行比较，并对模型进行必要的调整。该计划将有助于理解纤维复合材料的力学行为，评估意外损伤的重要性的能力，以及在海上结构中可靠地实施复合材料所必需的知识。

This research program will apply analysis, nondestructive and experimental techniques in order to develop an understanding of impact damage in composite pipes under service conditions. The first phase will consist on the development of a finite element model that will include the effects of internal pressure as indicated by the service conditions of the structure. Endurance prediction models, of the composite after impact, will be developed and verified with experimental testing. The second phase will consist of a testing program with different levels of impact energy and internal pressure ratios on fiber reinforced composite pipes. During the experimental phase, nondestructive evaluation techniques such as acoustic emission, modal analysis and acousto-ultrasonics, will be applied to collect information about the mechanisms associated with failure induced by long term loading after impact. The final phase will consist on the analytical reduction of the experimental results for comparison with predictions from phase one and, the necessary adjustments to the models.This program will contribute to the understanding of the mechanical behavior of fiber composite materials, the ability to evaluate the significance of unexpected damage, and to the knowledge necessary for reliable implementation of composite materials in offshore structures.