疲劳强度

objectives: by building a long time and high-intensity and endurance-trained and exhausting exercise model in mice, testing the activities of gsh-px, mn-sod, cu-zn-sod, gsh, content of mda, serum cortisol, aldosterone, atrial natriuretic and the exhausting time, the effects of rubia cordifolia l on metabolism of free radical of heart are studied in trained mice.

摘 要：目的：通过分析耐力训练后一次力竭性运动大鼠部分自由基指标的变化来探讨补充茜草提取物抗氧化、提高机体抗疲劳能力的可能机制。方法：通过建立大鼠递增大强度耐力跑台训练实验模型，测定了大鼠力竭时间、心肌织某些生化指标和抗氧化酶活性一以及血清皮质醇、醛固酮、血浆心钠素影响。

In the process of wave slamming, the impact pressures with short duration and high peaks occurs when the waves hit the subface of the structure, which causes the destabilization of superstructure and the fratigue failure of joints.

在波浪冲击过程中，当波峰刚接触到建筑物底面时会产生历时很短但强度极大的冲击压力，这种极强的冲击荷载会引起建筑物上部结构的失稳或造成结构连接处的疲劳破坏。

The microstructure, strength-toughness and fatigue properties of an ultrahigh strength steel 40CrMnSiMoVA have been investigated. The so-called eta-bainite,composed of thin rareined austenite films within or between the bainitic ferrite laths was found in the steel after isothermally quenched at 300℃ for 1h.

本文研究了飞机起落架用超高强度40CrMnSiMoVA钢的显微组织、强韧性和疲劳性能，结果表明，该钢经300℃等温1h淬火可获得由贝氏体铁素体板条与条间或条内的残余奥氏体薄膜所组成的准贝民体组织。

RS RAS We with our ample experiecnce and tireless research and development efforts nuder the severest conditions of quality control and insipection ptoceduer,and under the help of most developed automatic equipment,we have now ready for you the most qualified RS RAS motorcycle roller chains.

RS，RAS牌摩托车专用链条，以多年制造链条的丰富经验，且不断努力研究发展和严格的质量管理，利用最先进的自动化机械设备所生产之链条具有在高速运转下所表现出的高强度，耐磨损，耐冲击，耐疲劳的高级品质。

A good balance between the dynamic property and the thermal-oxydative ageing property on the blend vulcanizates were obtained when curing system is SEV and the S/CZ/DM ratio of 1.5/1.5/0.5;There was a good balance among tensile strength and heat build-up and damping property on blend vulcanizes filled with moderate size carbon black;The mechanical properties of vulcanizate filled with N660/N330 and N660/N990 were medium between two carbon black filled individual.

补强填充体系对NR/ENR硫化胶的性能有较大的影响，选择粒径适中的炭黑品种N660作为补强剂，硫化胶在拉伸强度、疲劳生热和减震方面可以获得较好的平衡；N660/N330和N660/N990两种填充体系硫化胶的力学性能，基本上是单用一种炭黑所得硫化胶力学性能的加权平均；N660/白炭黑(40/20)和N660/碳酸钙(45/15)填充体系硫化胶的力学性能与相同用量下N660单用时的相当，而N660/陶土填充体系硫化胶的力学性能较差。

The test result shows that fatigue crack rate in welding line area is greater than that in parent metal when crack stress intensity factor amplitude △K is greater than 20 Mpa,but there is no more difference.

试验结果表明，在应力强度因子幅△K＞20Mpa后疲劳裂纹在焊缝区的扩展速率比在母材的大，但两者差距并不悬殊。

In this paper, the preparation technology of the Zn-Ni alloy coat by arc wire spraying and flame wire spraying are introduced. The binding strength and thermal fatigue behariour of the coats are studied.

介绍了采用电弧线材喷涂和火焰线材喷涂两种热喷涂工艺制备锌镍合金涂层，并对两种工艺所制备涂层的结合强度和耐热疲劳性能进行了研究。

For diameter 26mm axle bar of CK45 steel,when surface hardness is 54～ 62HRC,core maximum hardness is 32HRC and case depth is 3.8～5.3mm,it has an optim um combination of strength and ductility .

对φ26mm CK45钢轴杆，当表面硬度为54～62HRC，硬化层深度为3.8～5.3mm，心部硬度＜32HRC时，轴杆具有最佳的强韧性，获得了较高的静扭强度和扭转疲劳寿命。

The service conditions of two wear fits, rocker seat to base portion and plate member to adapter, are very strict. The two wear fits meet strength requirements and prevent themselves from deterioration due to excess wear and contact fatigue.

其中摇动台与其支承座、摆块与承载鞍两对摩擦副服役条件苛刻，要求具有一定强度，同时又能抗磨损和接触疲劳破坏。

Second, the random variables in reliability analysis of the steel rail are discussed. These random variables include the wheel load, the stiffness of the rubber pad and the bed, the temperature stress and the fatigue ultimate strength of the steel rail. And their probability distributions and parameters are discussed thoroughly.

其次，对钢轨可靠度分析中涉及的随机变量如轮载力、轨下胶垫刚度、道床路基联合刚度、温度应力及钢轨疲劳极限强度的概率分布类型和统计特征进行了详细讨论。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了