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The displacement method, Jintegral method and the modified crack closure integral (MCCI) method for the evaluation of the stress intensity factors (SIFs) are reviewed.


Two methods are examined for accurately calculating stress intensity factors in two and three dimensions: the stiffness derivative technique and the Jintegral method.


Methods based on the Jintegral method and Betti's reciprocal theorem in extracting the fracture parameters, critical stress intensity factors, Tstress, and the second term of σy(r,0) near the crack tip prior to fracture initiation are formulated.


Optimum regression model and datawindow on Jintegral method based on hysteresis on PC/PBT blend


The Jintegral method was introduced to investigate the fracture process of PP/CaCO3 composites.

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 In this paper, stress intensity factors of multiple cracks in thickwalled cylinders subjected to thermal load have been determined by means of th integration, using FEM. The proposed programme can also be applied to the computation of the stress intensity factors for other plane problems under the loadings of either mechanical forces or temperature fields or both. In the meantime, this progrom has provided functions to form meshes of elements and compute coordinates of nodes automatically. A. practical example... In this paper, stress intensity factors of multiple cracks in thickwalled cylinders subjected to thermal load have been determined by means of th integration, using FEM. The proposed programme can also be applied to the computation of the stress intensity factors for other plane problems under the loadings of either mechanical forces or temperature fields or both. In the meantime, this progrom has provided functions to form meshes of elements and compute coordinates of nodes automatically. A. practical example for the polyethlence reaction cylinders has been given in the final part of this paper, in which the number of cracks are taken as 1, 2, 4, 8, 16 and 36. The functional relations between the stress intensity factors and crack numbers as well as crack depth are obtained. Besides, some features of the stress intensity factors for the case of internal multicracks are also discussed and then the fatique life can be predicted. According to the analysis proceeded above, some conclusions can be made as follows:(1) The stress intensity factors decrease with the crack number increasing from 2 to 36.(2) The values of stress intensity factors for one crack and four cracks are very close as the crack depth α/H<0.4. But when α/H>0.4, the value of SIF for one crack drops rather quickly.(3) The stress intensity factors increase with the increase of crack depth when it is subjected to mechanical forces, and just on the contrary when it is subjected to temperature fields.(4) When the crack depth α/H≤0.01, the influence of crack number on the stress intensity factors is not great.( 5) The results obtainted by means of the displacement method, stress method, Jintegration using FEM are essentially in agreement with one anotherBesides, there are also some similar features for the different radius ratio of the cylinders.  本文用J积分法研究厚壁圆筒的热应力多裂纹问题,并与位移法、应力法比较,其结果是满意的.作者编制的程序还可用于机械力和温度场下其他平面问题中的应力强度因子的计算.  The main objective of this paper is to characterize the fracture behaviour of laminated composites by applying the concepts of anisotropic linear elastic fracture mechanics. In particular the fracture toughnesses of both 3240 glass wove reinforced epoxy and [02/±45/ ±45/02]s carbon fiber reinforced epoxy laminated composites have been investigated. In order to determine the fracture toughness of the lamieates, three different techniques including KCalibration , JIntegral Method and Energy Method have been... The main objective of this paper is to characterize the fracture behaviour of laminated composites by applying the concepts of anisotropic linear elastic fracture mechanics. In particular the fracture toughnesses of both 3240 glass wove reinforced epoxy and [02/±45/ ±45/02]s carbon fiber reinforced epoxy laminated composites have been investigated. In order to determine the fracture toughness of the lamieates, three different techniques including KCalibration , JIntegral Method and Energy Method have been used. Good experimental results can be obtained from the three techniques.  本文应用各向异性线弹性断裂力学的理论和方法对复合材料层板的断裂特性进行了实验研究。文中采用了三种不同的方法即K标定法、J积分法以及能量法测定了3240玻璃钢和[0_2/±45/±45/0_2]_s碳/环氧层板的断裂韧性,三种方法均给出了比较满意的结果。  Using the method of Jintegral with cantilever beam specimens, the environmental fracture process of structural steels was studied. The precision measurements of the loadpoint displacement showed that the process is a continuous or quasicontinuous one. Crack initiation occurs at the tipblunted crack root surface or an adjacent position. The fracture process can be separated into four characteristic regions. Correspondngly, there exist two threshold stress intensity factors both for crack initiation and for... Using the method of Jintegral with cantilever beam specimens, the environmental fracture process of structural steels was studied. The precision measurements of the loadpoint displacement showed that the process is a continuous or quasicontinuous one. Crack initiation occurs at the tipblunted crack root surface or an adjacent position. The fracture process can be separated into four characteristic regions. Correspondngly, there exist two threshold stress intensity factors both for crack initiation and for stable crack propagation.  用悬臂梁J积分法研究了结构钢的环境断裂过程。施力点位移的精细测定证明环境断裂过程是连续或准连续的。启裂发生在钝裂纹根部表面或近旁。断裂过程可区分为四个特征区,相应有表征启裂和稳态裂纹扩展的界限应力强度因子。   << 更多相关文摘 
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