理论应力集中系数

各国标准都以理论应力集中系数Kt作为确定试样几何参数的主要依据。

The theoretical stress concentration factor K_t is the primary factor in defining the geometric parameters of standard specimens .

理论应力集中系数的有限元求法

Theoretical Stress Concentration Factor with FEA

将拉伸螺杆简化为理论应力集中系数Kt不同的带V形缺口圆杆，采用裂纹尖端为20节点奇异单元的三维有限元模型，对螺杆半椭圆表面裂纹的应力强度因子进行了计算。

By use of V notched round bars with different theoretical stress concentration factors as finite element models ( FEM ) of tensile screw threads , stress intensity factors ( SIF ) of surface cracks of screw threads are calculated .

针对先进飞机结构广泛采用的钛合金焊接结构，提出了描述焊接件疲劳特性的当量理论应力集中系数Kt（Kte）的概念；

With regard to the Titanium alloy welding structures generally used in advanced aircraft structures , an equivalent theoretical stress concentration coefficient K t ( K te ) was introduced to describe the fatigue property of welding specimen .

在综合考虑疲劳缺口系数和理论应力集中系数的影响下，对疲劳强度指数的均值和标准差分别进行修正，获得适用于高周构件的寿命预测公式。

Fatigue notch factor and theoretical stress concentration factor is used to modify the mean and standard error of fatigue strength respectively .

传统的应力寿命法利用点准则，即直接采用危险点的最大应力或者应力幅结合确定理论应力集中系数下的应力寿命曲线来估算结构的疲劳寿命。

The traditional Stress-Life method uses " point-criterion ", namely uses the maximum stress or stress amplitude of critical point directly with the Stress-Life curve to predict the fatigue life of structure .

改进方法包括：提出应力修正系数概念和一种适用于轮盘榫槽结构的理论应力集中系数确定方法，以及应力比修正方法。

It includes the concept of stress correction coefficient , a new method to determine the stress concentration factor of mortise of a disk and a new method for correcting the stress ratio .

采用这两类单元计算了错位板接头、T型板接头、工字梁焊接钢结构和工字梁十字接头的应力场，得到了相应的理论应力集中系数公式。

The stress fields in misaligned welded joints , " T " type of plate welded joint , flanged beam and perpendicular flanged beam are calculated respectively , and their stress concentration factors formulation are obtained .

缺口试件引入残余压应力，由于应力集中效应，缺口根部的残余应力集中系数可能高于理论应力集中系数，因而其疲劳强度将超过最高的光滑试件疲劳强度。

Once compressive residual stress is induced in the notched area , the residual stress concentration factor can be higher than the theoretical stress concentration , therefore the notched fatigue limit can be higher than the highest smooth fatigue limit .

局部应力集中；神经网络；可靠性理论；应力集中系数；显性表达式；可靠性分析；理论依据；

Local stress concentration ; Neural network ; Reliability theory ; Stress concentration factors ; Explicit expression ; Reliability analysis ; Theoretical foundation ;

通过有限元法理论计算、光弹试验，研究了滚子链链板理论应力集中系数问题。

In this paper , the problem of the theoretical stress concentration factor of plate of roller chain has been studied systematically by the theoretical calculation of finite element method and photoelastic experiment .