Fracture mechanism, initiation and propagation of cracks, and the control method of cracks in rock like brittle material under dynamic load are described in this paper.
本文主要论述了动荷载作用下岩石等脆性材料的断裂破坏机理、裂纹形成与扩展以及裂纹的止裂与控制等内容。
In this paper, fracture mechanism, position and direction of crack initiation of mixed mode fracture in several ductile materials are tested, and stress distributions of which are analyzed.
应用传统强度理论和细观力学方法对几种韧性材料在复合载荷条件下的断裂机理、启裂位置、开裂方向进行了实验分析和应力场计算。
J integral value related to the initiation of ductile crack is important material properties for the engineering structure of ductile fracture.
韧性裂纹开始扩展的J积分值对于韧性断裂的工程构件是一个重要的材料性能指标。
The results show that the fracture mode of blade is vibration fatigue and the main cause of initiation of fatigue crack is the mismatch between rabbet and tongue-and-groove.
结果表明，叶片的断裂模式为振动疲劳，叶片榫头与榫槽配合不当是萌生疲劳裂纹的主要原因。
The predicted valued of the fatigue limit of crack initiation the fatigue limit of fracture, and the non-propagating crack length agreed well with the experimental values.
包括裂纹的萌生极限、断裂极限以及停止扩展裂纹长度的预测值与实验结果吻合。
It is shown that the zigzag grain boundary may delay the initiation, growth and propagation of crack, as well as may also influence the crack morphology and the fracture mode markedly.
研究表明，弯曲晶界对裂纹的萌生、长大及扩展，对裂纹的形态及断裂方式，都有显著的影响。
The micro wear mechanism for PEN is plastic flow and broken of the fiber structure, while that for PI is crack initiation, extending and block fracture.
PEN薄带的微观磨损机理主要是纤维组织的塑性流动和拉断，而PI薄带的微观磨损机理为裂纹的萌生、扩张和块状剥落。
The results showed that manufacturing defects of the bolt resulted in initiation and propagation of fatigue crack, and uneven loading of the bolt speeded up failure process of fatigue fracture.
确认螺栓机加工不当引起疲劳裂纹的萌生及扩展，加之螺栓受力不均匀加速了疲劳断裂过程。
To investigate the effect of initiation location of new fractures on well production, a reservoir model and a hydraulic fracture model are combined to model the fluid flow after re-fracturing.
针对重复压裂不同起裂位置对油井产量的影响问题，采用油藏流动模型和水力裂缝流动模型共同描述系统的流动。
It is shown that the proposed ductile fracture model can accurately and effectively predict the whole damage process of ductile metals including crack initiation, propagation and final fracture.
结果表明，该模型可很好地预测延性金属材料自裂纹萌生、扩展直至完全断裂的全过程。
This paper deals with the fracture of the carbonitriding shaft of the motorcycles clutch. Initiation and expansion of the cracks have been investigated.
以摩托车离合器主轴的疲劳断裂为例，讨论了裂纹的形成和扩展。
A simulation method of molecular dynamics is introduced to simulate the interface crack initiation, from which the correlations between the interface stress and the interface fracture are acquired.
采用分子动力学模拟方法，可以对结合材料的界面起裂过程进行模拟，从而获得结合材料界面应力和界面破坏之间的关系。
The crack initiation life and the crack fracture life are the main life of the specimen.
试样寿命主要由裂纹萌生寿命和断裂寿命组成，扩展寿命所占比例较少。
The study of problems involving crack initiation, propagation and arrest is always the interest of fracture mechanics.
复合型裂纹起裂、扩展和止裂问题一直是断裂力学研究的重点。
Objective to study the crack initiation and fracture of porcelain-fused-metal (PFM) crown under monotonic load by means of experimental techniques.
目的研究烤瓷熔附金属冠中央窝受单调递增静态载荷下的裂纹产生和破坏形式。
The fatigue fractography consists of several different zones, including fatigue crack initiation, slow, fast propagation and final fracture.
疲劳断口上存在典型的疲劳裂纹萌生区、缓慢扩展区、快速扩展区和最后瞬断区。
The results showed that with increasing the amount of the initial void damage, the ductile fracture initiation toughness of steel decreases.
研究结果表明，随钢组织在预加载荷中产生的微孔洞初始损伤量的增加，其延性起裂韧性降低。
Based on the FAD, the engineering safety assessment procedure for pre-venting fracture initiation of piping flaws is established.
以失效评定图技术为基础，建立了一套可用于防止压力管道缺陷起裂的断裂评定工程方法。
The main course of fatigue fracture is due to existence of the inclusion in the material. The inclusion induce crack initiation, the crack propagation and the axe fracture in the circle stress.
疲劳断裂的主要原因是在材料中存在的夹杂物诱发裂纹源，在循环应力的作用下裂纹扩展导致断裂。
Fracture test of the BT20 indicates that brittle unstable fracture occurs after ductile crack initiation and slow propagation for all the compact tension (ct) specimens.
BT 20钛合金断裂试验表明，CT试样均在裂纹延性启裂并缓慢扩展后，发生脆性失稳断裂。
This section will introduce the concept of Fracture Mechanics and initiation and growth mechanism of fatigue cracks, in particular, fatigue crack developed from welding defects.
本节将介绍结构断裂力学概念，礼炮裂纹的起始和生长机理。尤其是从焊接缺陷开始的疲劳。
With the compliance changing rate method, the crack initiation time and the dynamic fracture toughness of CFRP and GFRP laminates were obtained at two kinds of strain rates separately.
利用柔度变化率方法确定起裂时间，分别得到在两种加载速率下CFRP、GFRP层板的动态断裂韧性。
Fatigue crack initiation is an important period in the whole fatigue life. The damage regularity of crack initial period cannot estimate with fracture mechanics which is used in large crack.
疲劳裂纹萌生阶段在整个疲劳破坏过程中占有极为重要的地位，而萌生阶段的裂纹体损伤规律用长裂纹断裂力学方法是无法确定的。
By using measurement of mechanical parameters and microscopic observation, the effect of initial damage on the ductile fracture initiation toughness of steel was investigated experimentally.
通过力学参数测量和微观观察研究了初始损伤对钢的延性起裂韧性影响。
The results showed that nonmetallic inclusions in weld seam served as crack initiation site under external bend load, and large amount of m a structure resulted in cleavage fracture of weld seam.
结果表明，焊缝金属中存在的非金属夹杂物，在低应力作用下形成微裂纹成为裂源，加之焊缝组织中存在大量的MA结构群，从而发生焊缝金属在室温下的解理断裂。
Based on loading-displacement curve, loading-length of crack expanding is drawn out which can determine crack initiation loading of static fracture experiments.
结合实验载荷-位移曲线，绘出载荷-裂纹扩展长度曲线，用于静态断裂实验中确定裂纹的起裂载荷。
The stress whitening can be clearly seen on the fatigue fracture surface and its region is the initiation and nucleation of fatigue crack which is the main part of total fatigue life.
疲劳断口有应力发白现象；应力发白区为疲劳裂纹形核和萌生区，其寿命占疲劳总寿命的大部分；
The stress whitening can be clearly seen on the fatigue fracture surface and its region is the initiation and nucleation of fatigue crack which is the main part of total fatigue life.
疲劳断口有应力发白现象；应力发白区为疲劳裂纹形核和萌生区，其寿命占疲劳总寿命的大部分；
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