专业英语封面1.doc

学号： 1010121019 《专 业 英 语》 外 文 翻 译 题 目 疲劳强度的金属和复合材料再重复的方法 学生姓名 冯 齐 放 专业班级 10材控一班 任课教师 刘 建 考查成绩 FATIGUE STRENGTH OF METALLIC AND COMPOSITE MATERIALS UNDER REPEATED TENSION–COMPRESSION V. P. Golub, V. I. Krizhanovskii, A. D. Pogrebnyak, and E. S. Kochetkova UDC 539.376 The fatigue strength of metallic and composite materials under combined static and cyclic loading is analyzed. The analysis is based on limit-state models, which allow us to describe limiting-stress diagrams of all known shapes, including convex, rectilinear, S-shaped, and concave. The fatigue strength of the following materials is evaluated: carbon and alloy steels, aluminum alloys, creep-resistant nickel alloys, unidirectional composites, plastic laminates, glassfiber-reinforced plastics, and polymers. The calculated results and experimental data are in satisfactory agreement Keywords: fatigue strength, high-cycle loading, combined stress cycling, limiting-stress diagrams, carbon and alloy steels, aluminum alloy, creep-resistant nickel alloys, unidirectional composites, plastic laminates, glassfiber-reinforced plastics, polymers Introduction. In problems of evaluating the fatigue strength of materials and structural members, the asymmetry of the stress cycle is usually accounted for based on isochronic limiting-stress diagrams [5, 9, 11, 12, 15–17]. Such diagrams are used to derive analytic relationships between the cyclic and static stress components for a fixed number of cycles to failure. Linear and parabolic relationships have become most common in the practice of calculation. It is agreed that experimental data fall within a narrow range between the normalized limiting curves with exponents 1 and 2, respectively. In reality, however, the shape of experimental limiting-stress diagrams may vary