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专业词汇:residual stress, internal stress,locked-in stress
1、 The understanding about the internal stress
1) Engineer: manipulate the internal stress to obtain desired properties.
2)The average people: alarmed, hazy understanding, feel the stress should be eliminated.
2、 The introduction of the internal stress
1)Source
--Inevitable to introduce the internal stress throughout the manufacturing operations
2) Benefits
-- Manufactures introduce them
--Many stress-related effects and recipes for obtaining them have long been known3)New ability to measure the stress fields
--Directly measure rather than infer
--Important for the trends in engineering design
3、 The application of the tree trends
1)Nontraditional materials
2)The trimming of safety margins
--Lavish use of materials is uneconomic
--A large safety factor about the objects lofted into space is impractical
3)The reduction in scale of engineered systems
-- For the microscopic field
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