脆性断裂

论脆性断裂判据

Discussing the Criterion of Brittle Fracture

晶界处聚集的O，S，C等杂质元素引起脆性断裂；

Some impurity elements gathered at crystal boundary , such as O , S , C , cause brittle fracture .

热浸镀PC钢丝扭转脆性断裂分析

Fracture Analysis of Torsional Brittleness of Hot-dipped PC Steel Wire

PC钢棒脆性断裂断口的SEM研究

Study on Brittle Fracture of Hi-Bond Wire with SEM

KⅠ，KⅡ复合型裂纹的脆性断裂

An investigation on the brittle fracture of k_ ⅰ - k_ ⅱ composite mode cracks

V型切口脆性断裂的研究

Research on V-notched Brittle Fracture

Ⅰ-Ⅱ复合型裂纹脆性断裂的最小J2准则

The minimum j_2 criterion for I-II mixed mode brittle fracture

压缩试样断口呈45°，压缩断裂属于穿晶断裂，SEM断口分析表明有脆性断裂特征。

The sample submit 45 ° fracture , and belongs to transcrystalline fracture . The brittleness fracture feature can be found by SEM analysis .

结果表明所给出的单奇异性V形切口的脆性断裂准则有效、简单且便于工程应用。

The findings indicate that the brittle fracture criterion for V-notches with single singularity is valid and simple , so it can be applied to engineering conveniently .

作者根据对断裂过程的观察和断裂试样断口的分析结罘，讨论了WC系钢结硬质合金断裂的微观机制，并提出了提高材料抗脆性断裂能力和防止早期破裂的途径。

The micro-fractural mechanism of WC base steel-bonded carbide has been discussed and the wags for improving fragile resistance and preventing premature break .

叉车货叉失效方式主要表现为塑性变形超差，脆性断裂和早期疲劳断裂。材料的断裂属脆性断裂，C低时为解理断裂和微孔聚合共同作用的准解理断裂，C高时为解理断裂。

Fork failure of a forklift truck mainly takes a form of plastic deformation exceeding allowable limit , fragile breakage and early stage fatigue breakage . When the carbon content is high , the fracture is mainly cleavage .

扫描电镜对摩擦表面和抗弯断口的对比观测表明，ZrO2增韧Al2O3陶瓷磨损破坏机理属于一次性脆性断裂机理。

The observation of friction surface and bending Fractured surfaces by means of SEM shows that wear failure mechanism of ZTA ceramics belongs to brittle fracture mechanism .

运用Griffith等有关脆性断裂理论，试验和研究了煤岩单轴压应力状态下的脆性断裂过程。

Brittle fracture of coal rocks in uniaxial compressive stress is studied by use of Griffith criterion of brittle .

结果表明：弹性体EPO对PP有很好的增韧效果，当EPO用量为4份时，PP从脆性断裂转变成韧性断裂；

The results showed EPO had good toughening effect on PP , when the content of EPO was 4 phr , PP changed from brittle fracture to tough fracture ;

GPE能明显改善共混体系的相容性，提高共混体系的冲击强度，仅用20%的GPE就能使共混物由脆性断裂变为韧性断裂。

Only 20 % of GPE could make the blend from brittle fracture transmute to tough fracture .

最大周向应力随着摩擦因数的增大而减小。基于2个基本假设，建立了I-II复合型V型切口脆性断裂的最大周向应力准则。

Based on two main hypotheses , the maximum circumferential stress criterion of brittle fracture is proposed for the V-notch problem with the combined model of I and II .

对位芳纶扭转疲劳断口呈现原纤分裂，UHMWPE纤维皮层呈蠕变特征，芯层有脆性断裂特征。

Fibrillation cleavages were observed on torsional fatigue fracture ends of para-aromatic fiber while creep characteristics was observed on the skin of UHMWPE fiber and the brittle rupture in the core .

对复合材料断口观察表明，SiC颗粒与镁合金界面之间的粘结强度大于基体的撕裂强度，SiC颗粒的聚集、团聚是导致复合材料断裂的主要原因，且复合材料的断裂形式趋向脆性断裂。

Examination of the fracture surface indicated that the bonding strength between SiC and matrix alloy was stronger than that of matrix . The SiC particles segregation is the main cause of the SiC P / AZ80 composite failure .

通过薄片试样原位拉伸和圆棒拉伸实验研究了富Nd第二相颗粒的早期脆性断裂对一种近α型钛合金断裂行为的影响。

By means of in situ SEM tensile deformation and rod sample deformation tests , the effect of brittle fracture of Nd rich second phase particles on the fracture behaviors of a near α titanium alloy has been investigated .

结果表明，该扳手材料含锰量太低，造成低熔点的FeS沿铸态奥氏体晶界析出，导致铸件脆性断裂。

It is analyzed that the main causes are low manganese content which resulting the low melting point FeS precipitate along the grain boundary of austenite under cast condition .

在V型切口的脆性断裂准则的基础上，提出了结合材料界面端问题的应变能密度因子准则、形状改变能密度因子准则、最大周向拉应力准则和最大周向拉应变准则。

Based on the brittle fracture criterion for V-notches , the strain energy density factor criterion , the distortional strain energy density factor criterion , the circumferential tensile stress criterion and the circumferential tensile strain criterion for interfacial edge of bonded materials are given .

Nd基大块金属玻璃样品在室温下是脆性断裂，大约在500K时变形模式从非均匀变形转变为均匀变形，在523K以上表现出显著的塑性变形。

The alloy is extremely brittle at room temperature and no plastic deformation . The deformation mode changes from inhomogeneous deformation to homogeneous deformation around 500 K.

通过对管道断裂的研究，人们提出了各种判据，如针对脆性断裂的能量释放率判据和应力强度因子判据；针对延性断裂的COD判据和J积分判据。

The people put forward all kinds of criterion such as the Energy Release Ratio criterion and Stress Intensity Factor criterion for brittle fracture and COD criterion and J Integrity criterion for ductile fracture by studying the fracture of pipeline .

富Mo区为沿晶脆性断裂，富Ti区为典型的穿晶解理断裂，Mo-Ti梯度层以穿晶解理断裂为主，还表现出延性断裂特征。

The Mo-rich layer shows brittle fracture along grain boundaries . In the Ti-rich layer , fracture is typical intergranular cleavage . Fractured surface of Mo-Ti gradient layer reveals feature of ductile fracture besides intergranular cleavage .

BMT复合陶瓷喷嘴入口处冲蚀磨损机制主要为脆性断裂，出口处的磨损机制为疲劳断裂，中间处的机制为微切削。

The erosion mechanism at entry of BMT composite nozzle was brittle fracture , and the erosion mechanism at exit was fatigue fracture , and that at middle was micro-cutting .

另外，该不锈钢的CVN冲击试样断口形貌随着时效时间的延长由韧性断裂机制的韧窝断裂为主向脆性断裂机制的准解理断裂和穿晶断裂为主变化。

The fractography of this alloy is changed from dimple fracture into cleavage fracture and inter-granular rapture with the extension of aging time .

该合金室温拉伸断口是以准解理断裂为主的脆性断裂，断裂沿-αMg基体和Mg2Si相的界面处产生并扩展，抗拉强度为137.45MPa，硬度为123Hv1。

The fracture occurs and extends along the interface between α - Mg matrix and Mg_2Si phase . The ultimate tensile strength and hardness of this alloy are 137.45 MPa , 123 Hv respectively .

纳米薄膜的断裂接近脆性断裂，断裂强度符合Griffith理想晶体脆断理论；纳米镍丝在断裂过程中表现出微弱塑性。

The rupture of nano film is more like brittle fracture and accords with Griffith theory of rupture , but that of nano wire is more like tough fracture with plastic flow .

高温下的断裂则存在一个亚稳态的初始裂纹长大和合并过程，使应力－挠度曲线呈现出非线性，在微观上TiC颗粒呈现脆性断裂，W基体呈现韧性撕裂。

There was a growth and coalescence of the initial substable cracks in the fracture at high temperature , and the stress deflection curves displayed nonlinear characteristics . The rupture of TiC was brittle and the failure of W matrix was a ductile bearing .

形变诱发层错重叠造成稳定奥氏体Fe－Cr－Mn（W，V）钢脆性断裂.沿晶断裂抗力随温度降低而减弱，发生沿晶断裂是高Mn钢断裂的重要特征。

But the deformation induced overlapping stacking fault is the reason of brittle fracture of stable Fe-Cr-Mn ( W , V ) austenitic steels . The intergranular fracture stress falls with the decrease in temperature . The intergranular fracture is an important characteristic in high Mn steels .