Influence of local crystallographic anisotropy on failure of metals

拟议研究的总体主题是以两种方式提高我们对金属合金在疲劳和失效期间的变形特性的理解。首先在裂纹萌生之前，研究材料的平均响应，目的是找出能量和变形如何根据微观结构分布。其次，在裂纹萌生之后，考虑了应力在靠近疲劳短裂纹处释放的方式。特别是，我们调查的作用，当地的晶体学性质的裂纹将如何传播。 这些研究将导致改进的故障预测方法，并应用于航空航天，汽车和发电行业。 更好地了解故障会提高安全性和经济效益，因为维修和更换可以在不那么保守的时间表上进行。

The overall theme of the proposed research is in improving our understanding of the deformation characteristics of metal alloys during fatigue and failure in two ways. Firstly prior to crack initiation, the average response of the material is studied with the goal of finding out how energy and deformation is distributed according to microstructure. Secondly subsequent to crack initiation the way that stresses are relieved in the one close to short fatigue cracks is considered. In particular we investigate the role of local crystallographic properties on how the crack will propagate. Such research will lead to improved failure prediction methodologies, with application in the aerospace, automotive and power generation industries. A better understanding of failure leads both to improved safety and economic gains since repairs and replacements can be carried out on a less conservative schedule.