RIA: Damage in Titanium Matrix Composites

9309520 Soboyejo将采用实验和分析相结合的方法研究单向/多向钛基复合材料中损伤的萌生和演化。损伤将使用噪声滤除的声发射信号、高分辨率原位光学显微镜和原位扫描电子显微镜进行监测。还将进行增量损伤累积实验，其中将使用成分(基质、纤维和界面)或复合材料弹性系数的局部和全局测量作为微裂纹或塑性造成的损伤指标。发展了细观力学和宏观力学模型，并将其应用于单调或循环加载下的损伤萌生预测。***

9309520 Soboyejo The initiation and evolution of damage in unidirectional/multidirectional titanium matrix composites will be investigated using a combined experimental and analytical approach. Damage will be monitored using noise filtered acoustic emission signals, high resolution in-situ optical microscopy, and in-situ scanning electron microscopy. Incremental damage accumulation experiments will also be performed in which local and global measures of constituent (matrix, fiber and interface) or composite modulus will be used as indicators of damage due to microcracking or plasticity. Micromechanics and macromechanics models are developed and applied to the prediction of damage initiation under monotonic or cyclic loading. ***