[一篇关于国庆游玩的英语作文 ！平淡的的那种]We take a holiday of 7 days because of the National Day.As we all know,October 1 is the National Day of China in Gregorian calendar. In the holiday I went to vi...+阅读
在这种情况下，方法的可靠性带来了更多的significanttechniques已经先进的基于一个合理的评价所产生的风险。对一个给定的管过程中发挥的不确定性等方法enablequantitative违约风险评价（加载，propertiesmaterials，温度，等），和优化管设计中考虑风险[ 1 ]。考虑到可疑的mechanicalanalyses是最佳的robustdimensioning结构的一个必要条件。这一目标的LED的structuresfor几十年的力学发展的概率方法。
这些方法使其部件或系统的可靠性和可能影响研究的设计变量对suchcomponents或系统行为的变化。耦合mechanicreliabilityengineering方法必须将越来越复杂机械建模（行为的非线性，动态，疲劳，断裂的过程，使reliabilityeffective等）和可利用的研究。这必要的复杂性causesanalyses越来越苛刻的机时。用高强度低合金钢制成管steelsare用来构造气transportingpressurized烃和长距离输油管道。
管道纵向高量的应力由于内部压力，上覆土层，地面交通，和environmentalattacks可以导致损伤，特别是在没有passiveprotective涂层。这种损害是压力腐蚀开裂的主要原因，壁厚减薄，和应力集中[ 2 ]的存在。此外，制造过程中的管，热mechanicaldeformations经常产生的残余应力。产生的残余往往很高，有时接近materialyield强度；然而，其效果并不明显，直到结构完全加载或暴露于服务环境[ 1,3,4 ]。
拉伸表面残余应力对疲劳损伤detrimentalbecause他们增加，构件的应力腐蚀敏感性，甚至断裂。这项工作的目的是由力学模型耦合，得到的概率统计训练一个近似模型。通过力学计算的数量来衡量该模型的有效性将需要建立一个强大的有关分析的替代品，这是可靠性和灵敏度。
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