| 翻訳と辞書 |
| fatigue limit ： ウィキペディア英語版 |
fatigue limit
Fatigue limit, endurance limit, and fatigue strength are all expressions used to describe a property of materials: the amplitude (or range) of cyclic stress that can be applied to the material without causing fatigue failure. Ferrous alloys and titanium alloys〔(【引用サイトリンク】 Metal Fatigue and Endurance )〕 have a distinct limit, an amplitude below which there appears to be no number of cycles that will cause failure. Other structural metals such as aluminium and copper, do not have a distinct limit and will eventually fail even from small stress amplitudes. In these cases, a number of cycles (usually 107) is chosen to represent the fatigue life of the material.
==Definitions==
The ASTM defines ''fatigue strength'', ''SNf'', as the value of stress at which failure occurs after ''Nf'' cycles, and ''fatigue limit'', ''Sf'', as the limiting value of stress at which failure occurs as ''Nf'' becomes very large. ASTM does not define ''endurance limit'', the stress value below which the material will withstand many load cycles,〔 but implies that it is similar to fatigue limit.
Some authors use ''endurance limit'', ''Se'', for the stress below which failure never occurs, even for an indefinitely large number of loading cycles, as in the case of steel; and ''fatigue limit'' or ''fatigue strength'', ''Sf'', for the stress at which failure occurs after a specified number of loading cycles, such as 500 million, as in the case of aluminium.〔 Other authors do not differentiate between the expressions even if they do differentiate between the two types of materials.
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「fatigue limit」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.
|
|