研究裂纹端部三维应力约束、塑性约束和位移约束等对谱载疲劳裂纹扩展的影响。
The objective of this paper is to study the effects of three dimensional constraints on fatigue crack growth under aircraft spectrum loading.
首先建立单一微裂纹在单轴压缩荷载作用下的力学模型，求出裂纹端部的应力分量。
A mechanical model is built firstly for single microcrack under uniaxial compression loading, and the stress component of microcrack end is calculated.
在混凝土类软化材料断裂研究中，裂纹端部损伤区被简化为具有黏聚应力分布的非线性裂纹，该黏聚力对裂纹扩展有阻抗作用。
In the fracture study of softening materials, the damage area of crack tip is regarded as a piece of nonlinear crack with cohesive force.
基于钢筋混凝土的破坏分析，结合混凝土类准脆性材料的断裂特性，本文提出了强化筋桥联基体裂纹力学分析模型，在该虚拟裂纹端部存在粘聚力分布，而强化筋在桥联裂纹处具有与基体脱离的部分段。
Based on the failure analysis of reinforced concrete and the fracture behavior of concrete as a type of quasi-brittle materials, a model of matrix crack with bridging bar is proposed in this paper.
首先，对两端加锚后裂纹尖端的应力场做了一些相应研究，对两端加锚的模型破坏模式做了简短的介绍，为以后的工作提出了建议。
First of all, the study on the crack tip stress field under the model anchored by CFRP have been done, and then do a brief introduction about the failure mode of the model with the CFRP.
结果表明焊接接头裂端应力三轴性随焊缝和母材匹配性质及裂纹几何不同而变化。
The numerical results show that the stress triaxiality varies with the mis matching mode and crack geometry of welded joints.
柔度算定试样是用一个有限端部半径的槽来代替裂纹。
The compliance-calibration specimen has a slot of finite-tip radius in place of a crack.
已有三个结构在翼缘节点板端部出现了裂纹。
Three structures have exhibited cracking at the ends of flange gusset plates.
又算出了这五种形状角焊缝趾端部和焊肉中央处的表面裂纹疲劳断裂的寿命。
The fatigue life of the surface cracks of the weld toe and the central part of the welding bead are calculated.
发现断面形态、裂纹路径以及肋状区裂端簇射状银纹群之间有直接联系。每一肋条由一细砂带和一粗破带构成。
It was observed that there was a direct connection between the fractographs, the fracture path and the crack tip crazes or microcracks in rib region.
分析了爆破弱应力波作用下中远区裂纹的端部应力场。
Analyzed end stress field of far district slight crackle under blasting dynamic.
拉索振动会使得其端部接头出现疲劳现象，在索锚处产生裂纹，破坏拉索的防腐系统，严重时还会引起拉索的失效。
It could lead to the joint's fatigue problem, create cracks in the cable anchor, damage the mitigate corrosion system and even cause cable invalidation.
某150t冶金起重机投产运行10多年后，主小车架马鞍形端梁局部产生了一些肉眼可见的裂纹。
The saddle-shaped end beams of the trolley structure of a 150 t metallurgical crane, which had been in use for 10 years, came to have a lot of visible cracks.
外加轧辊辊端长时间磨损过大，易造成辊身端部局部过载，引发裂纹的产生。
Excessive wear profiles due to long campaigns cause localised overloads at the barrel ends which favour the initial crack.
当裂纹相邻端距离较小时，裂纹远离端的应力强度因子较相邻端的应力强度因子值要大，表明裂纹将在远离端首先发生开裂；
When the distance between the tips of different cracks is short enough, the SIFs of remote tips are larger than the intimate tips', and …
随着各裂纹间相互作用的加强，会引起次生裂纹在预置裂隙端部附近反向扩展的现象，并形成一种新的断裂模式——包裹式反翼裂纹。
Then the interaction roles between the flaws gradually become stronger and stronger, and principally, the secondary cracks are induced to extend towards the direction opposite to wing crack.
随着各裂纹间相互作用的加强，会引起次生裂纹在预置裂隙端部附近反向扩展的现象，并形成一种新的断裂模式——包裹式反翼裂纹。
Then the interaction roles between the flaws gradually become stronger and stronger, and principally, the secondary cracks are induced to extend towards the direction opposite to wing crack.
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