| 翻訳と辞書 |
| Moving crack (metalworking) ： ウィキペディア英語版 |
Moving crack (metalworking)
A moving crack is a crack that propagates with some speed due to loading and unloading of a metal work material. When loading and unloading is being done, a large fraction of irreversible energy associated with those actions is eventually dissipated as heat and other part is being stored in the work material due to change in material structure and constraints caused dislocation pile-ups, etc. The fraction of heat dissipated in material () depends on type of material of fracture model is being used there. By conducting some experiments, it is found that the fraction dissipated as heat may be as large as 0.85-0.95 for metals, but this value doesn't depend on the magnitude and rate of deformation.〔 So according to work of Mason, can be as small as 0.5 for aluminium and steel at low value of strains only and for titanium at both and low value of strains.
== Heat generation and temperature increment ==
In general, the amount of loading and unloading energy which is converted into heat is for unit volume having high value. So this large value of heat generation per unit of volume results in substantial rise in temperature of the tip of the moving crack. This temperature rise can be of several hundred degrees Celsius as found in experiment done by Mason and Rosakis and others. The process region near tip of moving crack is the zone for maximum temperature.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Moving crack (metalworking)」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|