查询词典 crack

Starting with the toughening of ceramics, the subcritical crack growth model on monotonical loads was set up for the first time, and the V—K curves in the subcritical crack growth process and the effects on them were obtained by use of computer simulation.

首次从材料增韧入手，建立了单向载荷形式下亚临界裂纹扩展模型，并利用计算机数值计算获得裂纹扩展过程中V—K曲线及其影响因素，由此对多晶陶瓷材料疲劳现象的本质进行了分析。

According to the need in evaluation of the crack in structure, the author of this paper developed a new system based of photoelastic mechanics and digital image proccessing , which is specialy used to measure the length and width of crack.

本文针对工程结构开裂评估的需求，运用光测力学原理与近年间迅速发展起来的图像处理新技术，研究开发了一套&像素法&裂纹长度和宽度参数测定的新系统。

The fracture reasons of high strength PC steel wire are analyzed, it's considered that center segregation, central cavitation, poriness and inclusion are the metallurgical reasons which lead to the facture of PC steel wire and in the rolling process, differential coping quality, microcrack caused by surface defect, abnormal microstructure caused by burnt and improper cooling velocity, the ears on the head of the wire, overlapping of the wire rod itself are the main reasons which lead to the facture of PC steel wire. At the same time, inappropriate pickling, differential phosphorization quality, the bad heat treatment quality, the generation of crack in the improper drawing and transverse crack caused by abnormal laying of the drawing die are also the reasons of the cracking of PC wire.

对高强度PC钢丝断裂原因进行了分析，认为连铸坯的中心偏析、中心缩孔、疏松和夹杂是导致PC钢丝断裂的冶金原因；轧制过程中，较差的修磨质量、表面缺陷导致的微裂纹，过烧以及不适当的冷却速度导致的非正常显微组织，盘条头部的耳子、盘条本身折叠是导致PC钢丝断裂的主要原因；同时，不恰当的酸洗、较差的磷化及热处理质量、不适当拉丝裂纹的产生、拉拔模具安放不正导致的横裂也是PC钢丝断裂的原因。

It is known that the fatigue crack propagation rate is decidedby the stress-strain state of the crack tip at that time. According tolinear elastic Paris relation, this paper has suggested the three-point bendspecimen in which, from linear elastic to overall yielding ragions,da/dNis represented by the retation:da/dN=C_1~r.

由于疲劳裂纹扩展速率/决定于当时裂纹顶端附近的应力应变状态，本文根据线弹性范围内的Paris关系，提出三点弯曲试样在线弹性至全屈服范围内，/应服从下述关系：/=C_1~r。

Meanwhile a composite material has been used to simulate successfully the stochastical crack rock which was performed through adding crack blend, polytetrafluoroethyleneflakes, to geomechanical material.

同时，使用一种复合材料模拟了随机裂纹岩石，即通过将裂纹片掺合料，聚四氟乙烯薄片，加于地力学模拟材料而实现。

The main contents are as follows. By the experiments of two joints under low-reversed cyclic loading, the paper analyzes the failure pattern, energy dissipation, ductility and cracking in the joint cores, evaluates the seismic performances and anti-crack behaviors of the joints, and deduces the anti-crack formula of the subassemblage and prestressed frame joint. Through the finite element analysis software Ansys , the paper analyzes the specimens nonlinearly, and the theoretical analysis results are well consistent with those of the experiment.

主要内容包括：通过两榀节点在低周反复荷载作用下的试验，分析其破坏形态、耗能能力、延性性能和节点核芯区裂缝开展情况，评估节点的抗震性能和抗裂能力，推导出预压装配式框架节点的抗裂验算公式；并运用Ansys对试验中的节点进行了非线性分析，计算结果与试验结果基本吻合。

As one kind of tignum, concrete is widely used in infrastructure construction in our country. The research of the concrete crack resistance is urgent need, which was due to the common existing of concrete structure crack.

混凝土作为一种建筑材料广泛地应用于我国基础设施建设中，然而混凝土建筑物出现裂缝的现象十分普遍，因此，对混凝土抗裂性能的研究显得尤为紧迫和突出。

Tectonic condition is the key factor for igneous rock reservoir, which produce crack and improve reservoir character, abundant generating rock is the foundation for igneous rock reservoir, lithology condition is the important supplement for igneous rock reservoir, it is easy for trachyte to produce crack.

综合分析构造条件是火山岩成藏的关键，其产生的裂缝改善了火山岩储层的储集性能；充足的油源条件是火山岩成藏的基础；岩性条件是火山岩成藏的重要补充，即粗面岩容易在构造作用下形成构造裂缝，最终形成火山岩油气藏。

When a horizontal well is transversally fractured with multiple stages, initial crack can induce the secondary change of the wellbore stress, producing the induced stress ield which has an inluence on subsequent crack initiation.

水平井分段压裂时，形成的初始裂缝会诱发井筒周围应力分布二次改变，产生诱导应力场。诱导应力场将会对后续裂缝起裂产生影响。

The results show that the weaken of crack directors has a little influence on stress release and little influence on stress distribution when the crack directors is uncracked. Once it cracked, the tension stress in the arch dam will reduce greatly.

实例计算结果表明：在诱导缝未开裂时，其削弱程度对坝体应力的释放程度有很小的差别，而对坝体应力分布规律几乎没有影响；一旦诱导缝开裂，则坝体中的拉应力大为降低。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。