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  stress intensity
The stress intensity directly increased with the degree of desalination.
      
Complicated effect of the stress intensity and the cyclic loading on the surface morphology and pit concentration is demonstrated.
      
Correlation between acoustic emission parameters of a growing crack, the stress intensity factor, and the type of stressed state
      
Correlation between acoustic-emission (AE) parameters of a growing crack and the stress intensity factor in its vicinity was studied experimentally for various types of stress states.
      
Numerical examples of energy streamline and power distribution structures are given for the resonance and nonresonance blocking, as well as examples of the behavior of stress intensity factors at the crack tips.
      
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  stress strength
Reliability analysis of diesel engine crankshaft based on 2D stress strength interference model
      
A 2D stress strength interference model (2D-SSIM) considering that the fatigue reliability of engineering structural components has close relationship to load asymmetric ratio and its variability to some extent is put forward.
      
The initialization difficulty means, when v↑vR (Rayleigh wave velocity), the dynamic stress strength factor K2(t)→+0, and changes from positive into negative in the interval (vR, β).
      
It describes the mean stress strength or the limited damage degree of crust.
      
In this paper, a total criterion on elastic and fatigue failure in complex stress, that is, octahedral stress strength theory on dynamic and static state on the basis of studying modern and classic strength theories.
      
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  stress-intensity
Then the formulas of analytic solution of the displacements on the crack surfaces and of the stress-intensity factors of crack border are obtained.
      
Finite element method combined with dynamic photoelastic analysis to determine dynamic stress-intensity factors
      
obtains the general forms of complex stress functions and stress-intensity factors.
      
In these cases the approximate formulas calculating the stress-intensity factors are also presented.
      
The stress-intensity factor (SIF) of the semi-elliptical surface crack in the finite body under extensional stress is sclculated by using the FEM software ANSYS release 5.5.
      
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  stress-strength
The objective is to minimize the failure index defined (stress-strength ratio) under a given uniaxial load.
      
Inference on Reliability in Two-parameter Exponential Stress-strength Model
      
The problem of hypothesis testing and interval estimation of the reliability parameter in a stress-strength model involving two-parameter exponential distributions is considered.
      
Estimation of system reliability in Brownian stress-strength models based on sample paths
      
Bayesian estimation of system reliability in Brownian stress-strength models
      
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This paper explains the physical meaning of fracture parameter J (J integral) and presents a simple and accurate formula for determining the plane strain fracture toughness with a single three-point bending test piece. Also recommended is the method of testir.g KIC and JIC at the same time with the same test plece. By this method the relation between the stress intensity factor KI and the J integral, and the formula for calculating JIC are verified.The values of the plane strain fracture toughness of the seven...

This paper explains the physical meaning of fracture parameter J (J integral) and presents a simple and accurate formula for determining the plane strain fracture toughness with a single three-point bending test piece. Also recommended is the method of testir.g KIC and JIC at the same time with the same test plece. By this method the relation between the stress intensity factor KI and the J integral, and the formula for calculating JIC are verified.The values of the plane strain fracture toughness of the seven home-made high strength steels tested by this method are given.

本文首先介绍了断裂参数J(能量线积分)的物理意义,给出了测试平面应变断裂初度J_(IC)的一种比较简便而精确的、用三点弯曲试样和单点法计算J_(IC)的实用公式。其次,介绍了用同一试样同时测定K_(IC)和J_(IC)的方法,并用此法验证了应力强度因子K_I与能量线积分J的关系以及本文介绍的J_(IC)的实用计算公式。最后给出了用上述方法测定的七种在给定热处理条件下的国产高强钢的平面应变断裂韧度值。

This paper proposes a new theory of stress intensity factor for analyzing crack problems with blunt tip. This new theory is called "The Theory of Generalized stress Intensity Factor" (Theory of K1g). According to this theory, the stress intensity factor around the crack-tip is a function of several variables, while Irwin's stress intensity factor K1 is a constant, therefore the factor K1 becomes a particular case of the generalized factor K1g. The formulation of this generalized factor isK1g=ηK1.Here,...

This paper proposes a new theory of stress intensity factor for analyzing crack problems with blunt tip. This new theory is called "The Theory of Generalized stress Intensity Factor" (Theory of K1g). According to this theory, the stress intensity factor around the crack-tip is a function of several variables, while Irwin's stress intensity factor K1 is a constant, therefore the factor K1 becomes a particular case of the generalized factor K1g. The formulation of this generalized factor isK1g=ηK1.Here, the coefficient η which is also a function of several variables, represents the correlations between the stress intensity factor and the radius of curvature ρ0 at the blunt tip. When the radius of curvature ρ0 tends to zero or the distance r from the crack-tip approaches to the crack-tip (r→0), the coefficient η→1, then K1g=K1. By use of the theory of K1g, the relations between the stress concentr ation factor K and stress intensity factor K1 are investigated. Thus the new theory becomes an union that joins the ordinary criterion of strength of material and the criterion of linear elastic fracture of mechanics (LEFM).

本文用钝角裂纹模型提出一个“广义应力强度因子理论”(K1g理论)。这一理论认为,任何裂纹尖端附近的应力强度因子是一个场参数,它将是一个多变量函数。Irwin的应力强度因子 K1既然是一个常数,它将是广义应力强度因子K1g的一种特殊情况。作为钝角裂纹模型的K1g将在无限细的数学裂纹的尖点上退化为K1。广义应力强度因子的表达形式为风K1g=ηK1,其中η是一个多变量函数,它是一个对于K1;的修正系数。在数学裂纹尖点上有η=1。当稍离开裂纹尖点或者实际裂纹具有某些宽度和微小的尖端曲率半径ρ0时,η系数将小于1,并对K1值进行修正。 广义应力强度因子理论将断裂力学准则与常规强度准则联系起来,并且建立了它们之间的关系。K1g理论能够反映裂纹的缝宽参数和钝角尖端的曲率半径对于应力强度因子的影响,也能够反映裂纹尖端应力场中各点坐标参数对于应力强度因子的影响,因此有利于扩充应力强度因子理论的应用范围。

This paper proposes a method for analyzing the nature of singularity at an elastic crack-tip. According to the Muskhelishvili's exact solution of an elastic elliptical hole, the variations of the stress fields of different crack-tips are determined as the tip of the elliptic-crack model changing from a blunt tip to a sharp tip. The stress field at the blunt tip is represented by a function of several variables. The different limits of this function describe the nature of singularity at the crack-tip. With...

This paper proposes a method for analyzing the nature of singularity at an elastic crack-tip. According to the Muskhelishvili's exact solution of an elastic elliptical hole, the variations of the stress fields of different crack-tips are determined as the tip of the elliptic-crack model changing from a blunt tip to a sharp tip. The stress field at the blunt tip is represented by a function of several variables. The different limits of this function describe the nature of singularity at the crack-tip. With this method, the states of stresses and boundary conditions both at the blunt crack-tip and sharp crack-tip are discussed. In this paper, time stresses at the crack-tip are divided into two different kinds: i. e. intrinsic stress and approaching stress. The intrinsic stress is the stress that satisfies all the boundary conditions, while the approaching stress is tile stress that approaches to the crack-tip during the process of degenerating from an elliptic crack to a crack with Sharp tip. By use of the concept of intrinsic stress and approaching stress, the nature of the singularity of the stress field at the crack-tip can be analyzed, and the cause for the formation of tie "Sub-crack" during the blunting process of the sharp tip can be explained.

本文由弹性平面椭圆孔的精确解出发,用一个椭圆裂纹模型(钝角裂纹模型)退化到无限细裂纹(尖角裂纹模型)的方法讨论了平面裂纹尖端应力场的奇异性质。文中将裂纹尖端附近的应力场表达为一个多变量函数。然后,由各种不同的途径趋向裂纹尖点,从而求得了多重极限。分析表明,这一多变量函数的全面极限并不存在,而多重极限是存在的,但是各不相等。由这些多重极限的变化可以将裂纹尖点的应力分为两种类型:固有应力和趋近应力。其中固有应力是椭圆裂纹模型尖端处固有的应力,这些应力全部满足边界条件;趋近应力是当椭圆裂纹退化到无限细裂纹时所产生的应力场。由趋近应力和固有应力的变化就可以说明裂纹尖点应力场的奇异性质,并可解释“次裂纹”形成的原因。 本文根据对裂纹尖端应力场奇异性质的分析结果讨论了Westergaard-Irwin应力强度因子理论的近似性和局限性,并为应用钝角裂纹模型建立起来的广义应力强度因子理论[9]的裂纹尖端应力场计算提供了一种分析方法。

 
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