RESEARCH ON APPLICATION OF LINEAR NOTCH MECHANICS TO STRENGTH OF NOTCHED ADVANCED MATERIALS

本课题分为以下四个部分，每个部分取得了以下成果。（I）线性切口力学在大范围屈服问题中的推广定量地讨论了线性切口力学的应用极限，并将其推广到即使在大范围屈服情况下也适用的非线性切口力学。（二）线性缺口力学在新金属中的应用本文应用线性缺口力学对钛合金、热等静压、陶瓷涂层等新金属的缺口强度进行了评价，结果表明线性缺口力学是有效的，并将其结果作为专家系统的数据库。（三）线性缺口力学在新材料中的应用本文将线性缺口力学应用于纤维增强塑料、精细陶瓷等新材料的缺口强度评价，结果表明线性缺口力学是有效的，并将其结果作为专家系统的数据库。（四）线性缺口力学与残余应力的关系建立了残余应力的评价方法，讨论了线性缺口力学与残余应力的关系。

This project was divided to the following four parts, and the following result was obtained in the each part.(I)Extension of Linear Notch Mechanics to Large Scale Yielding ProblemThe application limit of Linear Notch Mechanics was discussed quantitively, and It was extented to Non-linear Notch Mechanics which is available even in case of large scale yielding.(II)Application of Linear Notch Mechanics to New MetalsLinear Notch Mechanics was applied to the evalution for the notch strength of new metals for example Ti-alloy, HIP, ceramics coating and so on. As results, it found that Linear Notch Mechanics is valid, and the results were used for data-base in an expert systems.(III)Application of Linear Notch Mechanics to New MaterialsLiniear Notch Mechanics was applied to the evalution for the notch strength of new materials, for example fiber-reinforced-plastics, fine ceramics and so on. As results, it found that Linear Notch Mechanics is valid, and the results were used for data-base in an expert systems.(IV)Relation between Lenear Notch Mechanics and residual stressA method for evaluation of residual stress was developed, and the relation between Linear Notch Mechanics and residual stress was discussed.