In July, the futures market for global benchmark Brent crude flipped out of backwardation--when the front-month contract is more expensive that contracts for delivery in later months.

Fatigue lifetime of valve springs contains two parts: lifetime crack initiation and another for crack propagation.

疲劳寿命一般包括疲劳裂纹萌生寿命和裂纹扩展寿命两部分.

The rolling contact fatigue life was found to be markedly related the subsurface crack propagation angle.

理论分析和试验结果表明,接触疲劳寿命与次表面裂纹扩展角之间存在着明显的对应关系.

High-strength alloy steels can experience rapid crack propagation from stress corrosion under certain loading conditions.

高强度合金钢在一定的载荷下承受应力腐蚀会造成裂纹的快速扩展.

The fracture procedure is a whole process of crack initiation, crack propagation and final fracture.

材料断裂过程为裂纹萌生 、 扩展和最后断裂过程,组织及实验条件对材料断裂有较大影响.

Meanwhile , this work shows that crack propagation is limited and stable under cyclic compression.

研究表明,裂纹在循环压缩载荷作用下的扩展能力是有限的、稳定的.

Shlyannikov , Z . B . Kuang , F . P . Yang ( 2004 ), Surface fatigue crack growth behavior , Russian journal Power Engineering Problems.

杨凤鹏, 林卓英 ( 2004 ), 表面裂纹疲劳扩展的试验, 北京科技大学学报.

The traditional theory of propagation of fatigue crack is transformed by the closure phenomenon of crackfatigue.

疲劳裂纹的闭合现象改变了传统的疲劳裂纹扩展理论.

In the present work discovering cutter mark of machining become surface fatigue crack fountain.

在试验过程中发现,疲劳裂纹源多为机加工留在表面的刀痕、划痕.

The result showed that the cause of leakage is large stress low cycle fatigue crack.

结果表明:泄漏是由大应力低周疲劳开裂造成的.

The fatigue testing heterogeneous plates showed that the mechanical heterogeneity affected the fatigue crack growth rate.

试验表明,力学不均匀性影响疲劳裂纹扩展速率.

The result shows that torque, fatigue crack and material are the main reasons for the breakage.

认为扭振 、 疲劳裂纹及材质是导致万向接轴扁头断裂的主要原因.

The fatigue crack under thermal load extension is analyzed in this paper.

用试验的方法研究了热疲劳裂纹的扩展过程.

Space craft orbital mechanics theory and research method were reviewed. The evolution dynamics principle was analyzed.

总结了与演变过程相关的轨道运动理论和研究方法,分析了各个阶段演变的动力学原理.

The space-craft will circle the moon twice.

宇宙飞船将环绕月球两次.

You can pilot a space craft and travel in the universe.

你可以驾驶一艘宇宙飞船旅行在宇宙中.

Container Crane is a large scale port machinery for container loading and unloading.

集装箱起重机是一种大型港口机械,主要用于装卸集装箱.

Container Crane Company 100 % share of domestic market, international market share is as high as 78 %.

公司集装箱起重机国内市场占有率100%, 国际市场占有率则高达78%.

This paper all-round analytical investigation for the electric control system of the container crane simulation.

介绍集装箱装卸桥电气控制系统设备的仿真.

A dedicated port for container crane equipment in the field.

用于港口集装箱专用吊机设备领域.

Based on Lagrange equations, a dynamic model is derived for typical underactuated mechanical gantry crane system.

针对龙门吊车这一典型的欠驱动机械系统, 采用拉格朗日方程的方法建立了其动力学模型.