查询词典 fracture

The authors adopted the software of finite element to simulate rock tension fracture, gave the breakdown of extensional criterion, selected the round, arch wall, rectangle, trapezoid and hemicycle as the simulation models and obtained the tension fracture forms of different shape chambers.

采用可模拟拉张破裂的有限元软件，给出拉张破裂的判据，分别选取圆形、直墙拱形、长方形、梯形、半圆形硐室模型进行拉张破裂有限元数值模拟。

Objective To investigate the injury stress mechanism of humeral fracture for the purpose of prevention and treatment of such fracture.

目的 探讨在不同的肩关节功能位置上肱骨骨折的受伤应力机制，为肱骨骨折的治疗提供理论依据。

The deformation mechanism is mainly the single-slip and cross-ship, the fracture mechanism is mainly the congregation of transgranular micro-hole, and large uniform deformation occurred before tough fracture, and therefore, the ability of plastic deformation and the mechanical properties of the material were remarkably improved. These fully indicate that the new melt-treatment developed in this work is an effective and advanced technique, and further testify that the improvement of metallurgical quality of the material is the key to enhance its mechanical properties, especially its plastic deformation performance. The results of tensile and compression tests at elevated temperature also indicate that the suitable hot-working temperature range is 400～450℃. 4. A steady-state plastic flow exists during the plastic deformation of the aluminum sheet used for pressure can at elevated temperature. A hyperbolic sine relationship can be satisfied between the steady-state flow stress and strain rate by introducing an Arrhenius term which involves some thermal activation parameters, i.

压力罐用铝材中的主要冶金缺陷为Al〓O〓夹杂物、气孔及富Fe杂质相；高效熔体处理显著改善了材料的冶金缺陷的存在形态，使含杂量明显减少、夹杂物尺寸变细小且分布均匀，富Fe杂质相变为细小、分布均匀的团球状或短棒状的复杂化合物，同时也明显细化了结晶组织；此外，由于高效熔体处理有效地减少了材料中裂纹萌生源数量，因而改变了材料的塑性变形微观过程及断裂方式，主要以单滑移和交滑移进行塑性变形，断裂方式为穿晶微孔聚集型，韧性断裂前产生了大量的均匀变形，不易出现变形失稳，从而显著提高了罐用铝材的塑变能力和力学性能。

Using the method of linear response theory in lattice dynamics on the basis of Tyson's model, the response displacements of atoms on cleavage plane at the incipience of brittle fracture was derived and an expression for evaluating brittle fracture surface energy of metals was found.

本文在Tyson模型的基础上，应用点阵动力学线性响应的理论方法，导出了脆断发生时解理面上原子的响应位移，并进而给出金属脆断表面能的计算公式。这种处理方式既保持了解理断裂面是结晶的表现，避免了局域"熔化"和"沸腾"模拟脆断的简单模型中出现的非晶化问题，也对解理面上原子临界位移做了合理估计，避免了人为规定临界位移的随意性，同时，从理论上得出的脆断时产生的声发射信号与实际探测到的量级相近。

The fracture features and interfacial microstructures of explosively welded Pt/Ti and postrolling progress have been studied by TEM, SEM, XRD and EDXA. The explosive welding interfacepossess some inconsecutive new phases. The phases are PtTi, PtTi3,Pt5Ti3 and so on, which havehigh strength. Tensial fracture position is located at the hoe of Pt.

用扫描电镜、能谱、X射线衍射仪对Pt／Ti爆炸焊接及爆后轧制双金属断面形态与界面结构进行的分析表明：爆炸焊接界面上有断续的新生化合物层，此层是由PtTi、PtTi3、Pt5Ti3等化合物组成的混合组织，有很高的结合强度，强制拉断在界面Pt侧。

Fracture experiments under biaxial loading and theoretical analysis are used to study the fracture behaviour of cruciform specimen of 16 MnR with a central penetrated ⅠⅡ mixed mode crack. A ⅠⅡ mixed mode crack J integral criterion is explored.

通过理论分析和双轴向断裂试验，对我国压力容器常用钢16MnR所制成的含中心穿透Ⅰ－Ⅱ复合型裂纹十字形试样的断裂规律进行了试验研究，探讨了Ⅰ－Ⅱ复合型裂纹J积分断裂准则。

Tower-door type fracture of the ankle joint is a rare and intra-articular fracture which is difficult to be treated.

踝关节塔门型骨折是一种少见且治疗困难的关节内骨折。

According to the theories of dynamics of explosive and rock fracture mechanics, initiation mechanism of kerf, and initiation of crack in its tip and its expansion of orientation fracture blasing with slit-charge in rock were studied, then the blasting, parameters were designed and tested by model test in laboratory.

以爆炸力学、岩石断裂力学理论为原理，对切缝药包在岩石定向断裂爆破中的切缝产生及裂纹起裂和扩展进行了一定的研究，同时对该法的爆破参数进行了设计，并在实验室进行模型试验验证其正确性。

Its fracture was compound cleavage and Intergranular fracture by LOM, SEM and heat treatment experimental instrument.

分析结果表明，其断裂属于解理和沿晶复合断裂，断口解理面较大，组织中有大块自由铁素体和粗大魏氏组织。

A macro and micro and chemical element analysis was made on fracture of ruptured coupling bolts,torsion test was performed and stress analysis and calculation were made,the results show that when the steam turbine had failure,MP-LP rotor coupling bolts and generator-exciter rotor coupling bolts failure were classified as overload shear fracture with partial deformation .

对215MW汽轮机断裂的对轮螺栓做断口宏观、微观分析，化学元素分析，扭转试验及受力分析计算，结果表明汽轮机组在事故中，中压-低压转子对轮螺栓和发电机-励磁机转子对轮螺柱的失效类型为：过载剪切断裂，同时局部挤压变形，这是由于事故过程中轴系受到冲击扭矩作用而引起的。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。