首页/ 题库 / [问答题]何为钢材的疲劳强度极限?或何为钢材的耐久的答案

何为钢材的疲劳强度极限?或何为钢材的耐久疲劳强度?

问答题
2022-03-04 18:52
查看答案

正确答案

根据钢材的疲劳试验结果,当钢材、试件、试验环境条件相同、并且应力比ρ=σmin/σmax为定值时,最大应力σmax随疲劳破坏时应力循环次数n的增加而降低,而且σ-n曲线具有平行于n轴的渐进线。当n趋于很大时,σmax趋于σef。σef表示应力循环无穷多次时试件不致发生疲劳破坏的循环应力σmax的极限值,称为钢材的疲劳强度极限或称为钢材的耐久疲劳强度。


试题解析

相关题目
boost的意思是:help or encourage to increase or improve
eloquent的意思是:fluent or persuasive in speaking or writing

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

A cabinet or space containing the controls or valves for the fixed firefighting system must be().
A cabinet or space containing the controls or valves for the fixed firefighting system must be().
CASE OF DEATH OR SERIOUS INJURY TO A PERSON IN AN ACCIDENT OR SHIPPING DISASTER is().
焊接结构的疲劳极限()材料的强度极限。
Mainly east 3 or 4 partly cloudy to overcast occasional rain()slowly south moderate or good.
Nomlnal(or money) interest rate 名义(或货币)利率
()any case or suspected case of quarantinable disease,or any case of eruptive disease or any death be discovered,the local quarantine officer must be notified immediately.
Should any case or suspected case of quarantinable disease,or any case of eruptive disease or any death be discovered,the local Quarantine Officer must be()immediately.
Masters are()solely responsible for all damages or accidents of whatever kind resulting from the navigating or handling of their vessels by day or by night.
If he is a common carrier,he is absolutely responsible to the owner of the goods carried ()any loss or damage to them unless caused by an Act of God or the Queen’s enemies,or the inherent vice in the goods themselves,or the negligence of the owner of the goods,or a general average sacrifice.
系统中雷达状态包括Unknown、Operational(or ON)、Failed(or OFF)、Detached。
Owners are to be responsible for loss of or damage to the goods or delay in delivery of the goods only in case the loss,damage or delay has been caused by the improper or negligent stowage of the goods.This means that().
The carrier is liable for loss of or damage to the goods or delay in delivery caused by fire,()the claimant proves that the fire arose from fault or neglect on the part of the carrier,his servants or agents.
Shutdown price(or point,or rule) 停业价格(或停业点、停业原则)
翻译:With Average or With Particular Average(WA or WPA)()
何为钢材的疲劳强度极限?或何为钢材的耐久疲劳强度?
()shall be liable for loss of and damage to the Vessel and/or goods arising or resulting from inaccuracies in stating the description,quantity,weight,measurement or contents.
广告位招租WX:84302438

免费的网站请分享给朋友吧