疲劳裂纹扩展率表达式是采用疲劳裂纹扩展理论预报疲劳寿命的核心。
The fatigue crack growth rate is the core for predicting fatigue life by use of fatigue crack propagation (FCP) theory.
对混凝土断裂时的电磁发射现象进行了理论研究，研究表明：混凝土断裂电磁发射是由于裂纹尖端电荷随着裂纹的加速扩展运动而产生。
A new idea that the distribution movement of electric charge in the cr ack tip end being associated with concrete fracture propagation produce electromagnetic emission is brought up.
由于岩石破碎过程非常复杂的，采用当前的动态断裂理论得出的裂纹扩展长度与实测值差异较大。
Because the process of rock broken is very complicated, there is a difference between the experimental data and theoretical result of expanding fissure by the present dynamic fracture theory.
根据断裂理论，对龙门起重机金属结构的裂纹扩展规律进行了研究。
According to the theory of fracture, the laws of crack spreading of gantry crane metal structures are carried out.
在总结现场试验效果的基础上，应用断裂力学理论分析了急倾斜煤层巷道放顶煤顶煤破断裂纹的扩展和破碎机理。
On the basis of summarizing testing effects, the extension of crack and the breaking mechanism of top coal caving in steep seam have been analyzed by applying fracture mechanics theory.
应用线弹性断裂力学的弹性能释放率及裂纹扩展阻力等基本概念和理论，建立起确定纤维增强高分子聚合物复合材料断裂韧性的能量方法。
An energy method for determining fracture toughness of fibrous composite laminates was based on the theory of elastic energy release rate and crack-growth resistance in this paper.
理论分析证明，在剪切载荷作用下裂纹扩展是由于拉伸应力引起的，并非剪切破坏。
Theoretical study shows that the crack extension under shear loading is caused by tensile stress, and it does not belong to shear fracture.
本文在大量的实验和理论分析的基础上，研究了银基触头材料表面的形变现象—裂纹的扩展机理。
The mechanisms of crack propagation and the surface deformation phenomenon of silver-based contact materials are investigated based on experiments carried out and theoretical analysis in this paper.
运用随机点过程理论导出了求取裂纹扩展随机过程低阶矩的公式。
In this paper, the lower order moments formulae of crack length distribution under given life were derived by means of stochastic point process theory.
该模型数学表达式具有半理论、半经验性质，能较好地反映弹塑性疲劳裂纹扩展的物理特征。
The mathematical expression of this model is half theoretical and half empirical in nature and can well represent the physical characteristics of EPFC growth.
分别给出了静止裂纹和定常扩展裂纹相变增韧的理论表达式。
The theoretical expressions of the toughening effect for both the stationary and steady - state growing crack are given respectively.
本文利用混合型裂纹扩展的能量释放率理论对脆性材料受轴向压缩时其内部微观裂纹的扩展规律进行了研究。
This paper presents a theoretical analysis about the propagation rule of the micro-crack in brittle materials under axial compression, based on the energy release rate criterion.
根据局部损伤理论和相似原理，给出了蠕变裂纹启裂前的孕育上下限时间并推导了蠕变裂纹扩展率方程。
Based on the local damage hypothesis and utilizing similarity solutions, this paper presents a procedure for estimating the incubation time prior to the onset of creep crack growth.
总结了机械寿命预测方法(包括疲劳损伤寿命计算和裂纹扩展寿命计算)，重点在于用理论分析的方法来代替大量的实物试验这一类方法。
Methods of predicting machine life has systematically summarized with the emphasis on those which use theoretical analysis to substitute large scale prototype experiments.
本文运用伤力学和断裂力学理论，从能量的角度对结构性土体裂纹扩展进行了全过程分析。
The whole flaw development process of earth body in structure is analyzed according to the theory of damage mechanics and fracture mechanics from the view point of energy.
基于梯度塑性理论，分析了应变软化及真实裂纹扩展阶段的局部化带的张拉位移和转角。
The tensile displacement and angle of rotation of tensile strain localized band are analyzed in strain softening stage and in real crack propagation stage based on gradient-dependent plasticity.
本文运用位错理论分析了裂纹成核、裂纹扩展机理；
The mechanisms of nucleation, formation and propagation of cracks are analysed with dislocation theory in the paper.
分别给出了静止裂纹和定长扩展裂纹相变塑性屏蔽的理论表达式。
The theoretical analysis of the toughening effect for both the stationary and the steady-state growing crack are given respectively.
在爆炸荷载作用下，岩体裂纹扩展速度的实测值与理论分析值之间存在较大差异。
There is a big difference between the experimental data and the theoretical result of crack spreading in rock under explosion load.
基于可靠度理论，本文采用一次二阶矩法(JC法)对疲劳裂纹扩展可靠性进行计算。
Based on reliability theory, the first order second moment method (JC method) is adopted to analyze and compute the fatigue reliability.
本文对孔边三维短裂纹扩展特性进行试验研究和理论分析。
In this paper, the behaviour of small crack growth originating at the edge of a hole was studied experimentally and theoretically.
本文根据砂岩储层的物理力学特征，运用断裂力学理论，给出了储层裂缝的应力强度因子的计算方法，定量地分析了开发过程中储层裂缝失稳扩展的判据、裂纹扩展方向。
Using the LFEM theory, the author provided the computing method of stress strength factor of crack and the criteria of crack instability propagation and propagation angle.
本文根据砂岩储层的物理力学特征，运用断裂力学理论，给出了储层裂缝的应力强度因子的计算方法，定量地分析了开发过程中储层裂缝失稳扩展的判据、裂纹扩展方向。
Using the LFEM theory, the author provided the computing method of stress strength factor of crack and the criteria of crack instability propagation and propagation angle.
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