The simulation results indicated that the fatigue cracking was caused by the combined action of horizontal stress, transverse stress and vertical stress of the dynamic vehicle load, and the alternate horizontal stress was the main factor of all. 结果表明,路面的疲劳破坏是动载引起的水平应力、横向应力和垂直应力共同作用的结果,水平应力的交变变化是使路面产生疲劳破坏的主要因素。
The alternate stress stimulates vibration ice, makes the offshore petroleum steel construction fracture because of the fatigue factor. 冰激振动引起的交变应力,将会使海上石油钢结构发生疲劳与断裂玻坏。
Locating the influence rule of pipeline corrosion and initial crack on the pipeline lifetime under the action of alternate stress. 找出管道腐蚀和管道初始裂纹在管道交变应力作用下对管道寿命的影响规律。
Based on the theory of thermal conductivity, the alternate fields of temperature and thermal stress, and the penetrating depth on the top surface of a piston are calculated, by the thinking of partial differential equation, fracture mechanics and other knowledge. 根据传热学原理,利用偏微分方程和断裂力学等方面的知识,计算了活塞顶面的交变温度场、交变热应力及其穿透深度。
Th e concentration of alternate stress is a key factor of fatigue destruction. 而交变应力集中是疲劳破坏的一个关键因素。
In addition, owing to the side column structure being subjected to the action of alternate stress of unsymmetrical cycle, it is recommended that the strength of side column should be evaluated by the allowable stress under the condition of alternate stress. 此外,由于侧柱结构承受非对称循环交变应力的作用,故建议按交变应力下的许用应力来评价侧柱结构的强度。
The operating principle, structure, and example of application of a kind of a cleaning machine with pressure block without alternate stress for petrochemical pipe were introduced. 介绍了一种石化管道无交变应力泵头清洗机的工作原理、结构形式和应用实例。
Based on the blind-hole method, series of experiments are carried out to analyze the effect of alternate loading to the redistribution of residual stress. 本文基于小孔释放法测量残余应力的方法,通过实验研究了交变载荷对焊接残余应力场产生的影响。
The fatigue of porcelain materical under static and alternate stress is studied. The result shows that fatigue phenomena and its limit exist for electrical porcelain, while the dynamic fatigue limit being as low as 70% of static one. 还研究了电瓷材料在静载和交变载荷下的疲劳现象,结果表明,电瓷材料存在疲劳现象和疲劳极限,动疲劳极限低于静弯曲强度的70%;
That the thread endures high alternate stress is the first cause of failure of thread joint. 螺纹部位承受高的交变应力,是导致螺纹联接螺纹失效的主要原因。
In the alternate stepwise stress accelerated life test, Under type ⅱ censoring of data from Exponential distribution, we give the linear unbiased estimates ( BLUE) of the coefficients in acceleration equation. 在交叉步进应力加速寿命试验中,假定在各组应力下产品的寿命分布为指数分布,对于定数截尾样本,求加速方程中系数的线性无偏估计(BLUE)。
Cleaning Machine with Pressure Block without Alternate Stress for Petrochemical Pipe 石化管道无交变应力泵头清洗机
In corrosive media, corrosion fatigue fracture of reinforcement in bending members also have fracture source zone, fatigue developing zone and fracture zone. Reduction of corrosion fatigue life is the result of combined action of corrosive media and alternate bending tension stress. 研究表明,在腐蚀介质中,弯曲腐蚀疲劳的钢筋断口同样存在裂纹源区、疲劳发展区和断裂区,钢筋腐蚀疲劳寿命的降低,是腐蚀介质和反复弯曲拉应力共同作用的结果。
These alternating loads make the reverse curving in crank each spot and so on the complex alternate stresses, Extremely easily has the endurance failure in the existence stress concentration fillet place, Usually takes the strengthened measure to perform to solve. 这些交变载荷在曲轴的各个部位产生弯曲、扭转等复杂的交变应力,极易在存在应力集中的圆角处产生疲劳断裂,通常采取强化措施加以解决。
It analyzed the factors influencing the health of nursing staff in psychiatric department, which included special work site, relative closed management, alternate duty system, lower social evaluation, interpersonal communication limitation and heavy family stress and so on. 分析影响精神科护理人员健康的因素有特殊的工作环境、相对封闭式的管理、轮流工作制、社会评价过低、人际活动受限及家庭压力大等;
Estimation of service life and reliability of parts and components of a crane by method of composite cyclic stress with alternate high and low stress cycle 用高低周复合循环应力法估算起重机零部件的寿命和可靠度
Some researches indicated that most of the regular cracks were fatigue cracks when blades were subjected to vibratory alternate stress. The fatigue crack growth rate of blade is the basic data to evaluate the degree of damage of the turbine runner. 水轮机叶片绝大多数裂纹为交变载荷作用下的疲劳裂纹,而叶片疲劳裂纹扩展速率是评估水轮机转轮损伤程度的基本数据。