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文章结构:
1、fact(introduction):engineers can manipulate the object’s internal stress→desired properties
2、举例解释:dental fillings & stress leads to fracture and can recall stress-related failure
3、作者观点(thus):all material stressed are without redeeming values and should be eliminated
4、作者观点:the behaviors of materials are complicated & interesting,需要引入永久内部压力
5、举例说明
6、作者观点:the residual stresses are beneficial and harmful
7、Fact: 普遍认知和做法(sometimes,have long been)
8、作者观点:强调new thing is the ability to measure the stress fields directly
9、作者观点:several trends让这种分析能力重要
(1)one-proliferate nontraditional materials
(2)Two-trim safety margins
Three-reduce the scale of many engineered systems |
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