Nondestructive Evaluation of Debonding in Fibrous Composites through Multiaxial Loading

建议确定一种新方法的可行性， 纤维复合材料脱粘的无损评价 材料. 该方法是基于微观力学预测 这表明， 单向金属基复合材料对材料的力学性能无影响， 轴向模量在纤维方向，但它确实有一个 对纯剪切模量的影响 复合应力状态下纵向复合材料 仍然是个悬而未决的问题。 拟议的测试方法将利用 从微观力学预测中获得的知识， 评估碳化硅/钛管中的脱粘， 一系列精心挑选的顺序，多轴载荷 增量。 该方法是非破坏性的，在这个意义上，在- 原地应力和应变测量提供了必要的数据。 不需要从试验机中取出试样， 采取边缘复制品，使用X射线设备，或进行显微镜 研究标本的切片部分。

It is proposed to determine the feasibility of a new method for nondestructive evaluation of debonding in fibrous composite materials. The method is based upon micromechanical predictions which indicate that damage in the form of debonding in unidirectional metal matrix composites has no influence on the axial modulus in the fiber direction, but it does have an appreciable influence on the shear modulus for loading by pure longitudinal composites subjected to combined stress states remains an open question. The proposed test method will exploit the knowledge available from the micromechanical predictions to assess debonding in silicon-carbide/titanium tubes through a series of carefully chosen sequential, multiaxial load increments. The method is nondestructive in the sense that in - situ stress and strain measurements provide the necessary data. It is not necessary to remove the specimen form the test machine, take edge replicas, use x-ray equipment, or conduct microscopic studies on sectioned portions of the specimens.