摘要
指定寿命下的疲劳强度是无法直接测定的,自从测定疲劳强度的小子样升降法被提出以后,这种方法被广泛地应用于测定材料疲劳强度的随机特征。本文提出一种用于疲劳强度测定的双细节串联试件,给出了一个新的升降法流程。试件两个细节的疲劳强度在统计上是相互独立的,一个细节的破坏不会影响另一个细节,当一个细节破坏后,另一个细节的疲劳试验仍可以继续进行。为验证方法的有效性,本文进行了一系列的数值模拟。同时,这种方法还被用于飞机结构模拟件的疲劳强度试验。数值模拟结果和实际试验过程均表明,串联双细节升降法可以显著地节约试验时间。
Fatigue strength of materials can＇t be determined directly by experiment, Since Dixon and Mood gave the up and down method for small samples, the up and down method has been widely used to determine statistical characteristics of material＇s fatigue strength. This paper presents a new up and down procedure for two details in series. Specimens with two details in series were used in the test. The fatigue strength of these two details are independent with each other, failure of one detail does not influence the other one, and the fatigue life test of existing detail can be continued after the other detail failed. A series of numerical simulation were carried out to determine the validity of this method. Fatigue strength test of air craft structure specimen was accomplished using this method. The results of numerical simulations and up and down test indicate that the present procedure can reduce experiment time significantly.
出处
《实验力学》
CSCD
北大核心
2006年第5期579-583,共5页
Journal of Experimental Mechanics
关键词
升降法
疲劳强度
疲劳极限
可靠性
小子样
up and down method
fatigue strength
fatigue limit
reliability
small samples
