破坏应力

The rods were also compared with goose-head nail and low angled intramedullary nail for breaking load in femoral intertrochanteric fracture models.

又在体外股骨骨折标本中测试了弹力钉所能受的应力，并与鹅头钉和低角度髓内钉作比较，结果是两根以上的弹力钉能受的破坏负荷为最高。

The main reason causing the breakage of the breech mechanism has been disclosed with analysing the distribution and magnitude of the dynamic stresses in two different situations. This provides useful references for mechanism design.

通过分析机匣在两种不同情况下动态应力的分布，揭示了导致机匣破坏的主要原因，为机构设计提供了有益的参考。

Under compressive stresses, tensional failure will occur in the rock bridge of the end of joint, which leads to connect new cracks of rock bridge with the nearby primary joints.

当节理在压应力作用下所产生的次生裂纹扩展达到相邻节理后，岩体就会产生贯通裂纹而破坏。

For different materials,the macrostructure of damage sites are dissimilar.The microstructure of damage sites were indicated as follows:the damages of granite and marble after being particle impacted were made up of damage of cleavage surfaces and crystal faces and spread of cracks along phase interface and pore space,which is harmful to mechanical property;while the damages of concrete and mortar were made up of cracks of transition zone and aggregates and plastic flow of C-S-H,which may cause more hidden danger to perma nence than to mechanical properties.

对四种材料损伤形貌的微观分析表明：花岗岩、大理石受颗粒冲击后产生的损伤主要为拉应力导致的解理面、晶面的破坏以及裂纹沿相界面和孔隙的扩展，对其力学性能有较大的危害；混凝土和砂浆的损伤由过渡区开裂、骨料破裂和C-S-H的塑性滑移共同构成，对耐久性造成的隐患远大于对力学性能的影响。

In order to prolong the service life of roller bearing, a deep end-cavity roller is applied to roller bearing of cone bits.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承抗接触疲劳寿命，提出在牙轮钻头滚动轴承中采用凹端圆柱滚子的方案。

In China, the roller bearing cone bit is now equipped with short cylindrical roller, which has stress centralization on the edge, and it easily causes fatigue failure on the contact area.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承杭接触疲劳寿命，提出在牙轮钻头滚动轴承中来用凹端圆柱滚子的方案。

In China, the roller bearing cone bit is now equipped with short cylindrical roller, which has stress centralization on the edge, and it easily causes fatigue failure on the contact area.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承抗接触疲劳寿命，提出在牙轮钻头滚动轴承中采用凹端圆柱滚子的方案。

The rubber seal issue under operating system has been studied by the theory of dynamic sealing. The deformation and stress distribution of rubber material were calculated under the well in-pressure and sealing out-pressure using then-linear finite element. Through the experimental study of the rubber strength and fatigue, the intensity limit and the fatigue life were obtained. According to the study results, a new type of sealing equipment was designed by adding the reinforcing steel bar into rubber core to reduce the maximum shear stress, so as to solve the problems of dynamic seal under hyperbaric pressure.

采用动态密封理论，针对带压作业系统中的橡胶密封胶芯问题，利用非线性有限元计算了在井压和密封外压作用下的变形和应力分布特征，并通过对密封胶芯材料进行了强度和疲劳实验研究，获得了胶芯材料破坏的原因，进而根据计算和实验研究结果，进一步提出了在胶芯内增加钢筋以减小最大剪切力的改进意见，同时进行了理论校核，并以此为基础设计了新型的密封胶芯，从而解决了带压作业装置高压动密封的难题。

In view of the differences in material property and fracture mode, the mechanism of using diamond polish to bore in component is studied, and a special diamond core boring bit is developed.

针对构件组成材料的性能特点和破坏方式，研究了佥刚石磨料对构件进行套料钻孔的机理，研制特定的钻孔工具和工艺装置，对构件钻削区及其周围材料施加预压应力。

In view of the differences in material property and fracture mode, the mechanism of using diamond polish to bore in component is studied, and a special diamond core boring bit is developed. The technological equipment can exert compressive pre-stress on drilling area and surrounding material.

针对构件组成材料的性能特点和破坏方式，研究了金刚石磨料对构件进行套料钻孔的机理，研制特定的钻孔工具和工艺装置，对构件钻削区及其周围材料施加预压应力。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。