材料科學(xué)與工程基礎(chǔ)1-資料下載頁
2024-12-31 21:01本頁面
【正文】 nced helicopters relies on a material posed of a carbonfiberreinforced polymer. (Courtesy of Sikorsky Aircraft Division— United Technologies Corporation.) ? oxygen or other gases ? Liquid ? Radiation（輻射） , atomic oxygen, debris （碎石，廢石） ? oxygen or other gases (1)Most metals and polymers react with oxygen or other gases, particularly at elevated temperatures. (2) Metals and ceramics may disintegrate . (3) Nonoxide ceramics and polymers may oxidize. liquid ? acid （酸） alkali （堿） salt（鹽） leading to premature failure Radiation（輻射） , atomic oxygen, debris （碎石，廢石） ? In space applications, we may have to consider the effects of the presence of radiation, the presence of atomic oxygen, and the impact from debris . load and unload the material thousands of times small cracks cracks grow materials fail Rate ? If we pull it slowly, the material can be stretched significantly. ? If we pull it fast, the material snaps. 14 Materials Design and Selection Physical and mechanical properties Design for a given application a number of factors economical solution Protect environment Recycling of the materials position synthesis and processing internal structure A good engineer will consider: ? the effect of how the material is made。 ? what exactly is the position of the candidate material for the application being considered。 ? processing have to be done for shaping the material or fabricating a ponent。 ? the structure of the material after processing into a ponent or device 。 ? the environment in which the material will be used。 ? cost toperformance ratio. ? The knowledge of principles of materials science and engineering will empower you with the fundamental concepts. ? These will allow you to make technically sound decisions in designing with engineered materials. 演講完畢，謝謝觀看！
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