因此，对这种材料在宏观裂纹分叉速度时，实验断裂表面能及断裂表面韧性没有单一值。
Consequently, at the macroscopic crack branching velocity, the experimental fracture surface energy and the fracture surface roughness; have no single value in such materials.
数值模拟结果显示混凝土破坏过程实际上就是微裂纹萌生、扩展、贯通，直到宏观裂纹产生导致混凝土失稳断裂的过程。
The numerical simulation results show that the initiation, propagation and linking each other of crack in concrete samples at mesoscale level produce the macro-failure of concrete samples.
分析结果再现了矿柱从微破裂产生到宏观裂纹形成、最后产生失稳破坏的全过程，并研究了统计平均强度与极限承载力的关系。
The paper numerically demonstrates the pillar failure process-from micro crack to macro crack to unstable failure and studies the relations between limit load and statistical mean strength.
通过快速裂纹扩展发生断裂，没有明显的宏观变形。
Brittle fracture. Fracture that occurs by rapid crack propagation and without appreciable macroscopic deformation.
结果表明：原始的萌生裂纹不一定是最后形成宏观贯通破坏的主裂纹。
Numerical simulation results show that initial cracks are not always the leading cracks which result in the ultimate macroscopical perforation failure.
通过观察断裂风机轴裂纹宏观和微观形貌，检验化学成分、显微硬度等方法对风机轴断裂的原因进行了分析。
Fracture analysis of the fan shaft was made by observing macroscopic and microscopic appearances of the crack, and examining micro hardness and chemical composition of the material.
经分析与实体零件的宏观与微观组织观察，此现象是因为还原介质渗入，引起合金体积膨胀而产生引力，造成应力裂纹。
Being the reducing medium, the volume expansion of alloy brings gravitation and crack through analysis and observation of accessory's macro-and micro structure.
通过化学成分分析、硬度试验、宏观和微观检验等方法，对减速机齿轮齿面弧形裂纹的产生原因进行了分析。
The reason of arc crack on retarder gear surface was analyzed by means of chemical composition analysis, hardness testing, macrostructure and microstructure examination.
踏面斜裂纹及断口的宏观形貌和理化检验与分析表明，踏面斜裂纹伤损属于滚动接触疲劳裂纹伤损类型。
The macro profile and physicochemical examination of the tread oblique crack shows that the crack falls into the category of rolling contact fatigue type.
通过灰口铸铁同质电弧冷焊焊缝断口宏观与显微分析，对灰口铸铁焊缝裂纹的形成及扩展机理进行了探讨。
In this paper, the fracture of grey cast iron weld has been observed by SEM, and the mechanisms of the cracking initation and progression have been discussed.
试验研究了X70管线钢在模拟土壤介质中，循环载荷下的裂纹扩展特性和宏观规律。
The crack propagation characteristics of X70 pipeline steel in the synthetic soil solution under cyclic loading are investigated.
裂纹宏观形貌平直。
发现裂纹剖面宏观形貌特征与制动盘疲劳裂纹扩展规律之间存在一定的关联，为制动盘寿命评估提供了新的思路。
The relation of law of the fatigue crack extending and feature of macro-profile is discovered, which provides a new method for the life estimation of the brake disc.
建立单颗骨料混凝土试件，探讨界面强度对混凝土宏观强度的影响，同时探讨骨料形状对裂纹扩展的影响。
Then single aggregate concrete specimens is established, the influence of interface strength to the macro-strength is discussed, while the shape of aggregate on the crack extension is investigated.
分析了制动盘裂纹剖面的宏观形貌特征，并对制动盘裂纹萌生和扩展机理进行探讨。
The feature of macro-profile is analyzed, and the crack initiation and extending mechanism of brake disc is discussed.
本文用宏观和微观方法测量了几种高强度钢的疲劳裂纹扩展速率，用金相和断口复型法观察了疲劳断口的微观形态以及与显微组织的关系。
The studies were carried out of the test of fatigue crack growth rate and relative to the microscopic morphology of fracture surface in certain high-strength steels.
研究中，将宏观断裂力学及微观断裂物理相结合，根据位错产生微裂纹机制，对磨削过程的微裂纹的形成采用位错赛积模型来描述。
According to the mechanism that micro-cracks come into being from the dislocation, the dislocation piled-up model is used to describe the grinding crack.
试验研究了X70管线钢在模拟土壤介质中，循环载荷下的裂纹扩展特性和宏观规律。
The crack propagation characteristics of X70 pipeline steel in the synthetic soil solution under cyclic loading are investigated. The macroscopical rules of the crack propagation are analyzed as well.
X射线CT研究混凝土的目的是通过CT扫描获得的CT图像，分析混凝土在不同荷载作用下细观裂纹的演化过程，解释混凝土宏观强度和变形特性。
The purpose of studying concrete using X-ray CT is to analyze concrete meso-crack evolution process and explain concrete macroscopic strength and strain character based on concrete CT images.
把细观损伤理论和宏观统计损伤模型结合，建立应力–应变与微裂纹密度变化的关系；
The relation between stress-strain and density variation of rock crack has been obtained through the meso-damage theory and damage statistics model.
利用扫描电镜对失效压铸模具热疲劳裂纹的宏观、微观、断口形貌进行了分析。
The macro-morphology, micro-morphology and fracture morphlogy of failure die casting dies were analyzed.
模拟复制最实际的实验，如启动和增长的机翼和二次裂纹，裂纹贯通，宏观失败的样本中观察到的现象。
The simulations replicate most of the phenomena observed in actual experiments, such as initiation and growth of wing and secondary cracks, crack coalescence, and the macro-failure of the sample.
试验研究了X70管线钢在模拟土壤介质中 ，循环载荷下的裂纹扩展特性和宏观规律 。
The electrochemical behavior of X70 pipeline steel in a synthetic near neutral soil solution is investigated.
试验研究了X70管线钢在模拟土壤介质中 ，循环载荷下的裂纹扩展特性和宏观规律 。
The electrochemical behavior of X70 pipeline steel in a synthetic near neutral soil solution is investigated.
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