CHENG Yuren SHI Xiaofeng PENG Xiang HOU Binglin Northern Jiaotong University
,
Beijing
,
China
金属学报(英文版)
The crack tip strain gauge method in the compliance technique was used to determine the opening load of notched crack of axle steel,and the nonlinear finite element ADINA program, to which the cyclic stress-strain curve of axle steel was applied,was used to analyze the stress-strain field ahead of the crack tip and the opening load of notched crack.The results of both the compliance technique and the numerical method were in good agreement.In this pa- per,the concept of the sensitive point is proposed and the key to the determination of the crack opening load in the experiment is to place a strain gauge at sensitive point.It is certified by both experimental and numerical methods that the sensitive point has the best linear relation- ship character and the value of strain is much greater.
关键词:
crack closure effect
,
null
,
null
,
null
曹蕾蕾
,
裴建中
,
陈疆
,
张涛
材料导报
doi:10.11896/j.issn.1005-023X.2014.23.009
梯度功能材料的热应力问题贯穿梯度功能材料设计、制备、性能评价及应用整个研究领域,其中,热传导问题是热应力研究基础.介绍了梯度功能材料的概念及热传导和热应力问题的研究背景,重点分析了梯度功能材料热传导和热应力问题在数学模型、物性参数模型、解析方法、数值方法等方面的国内外研究进展,并展望进一步研究方向.
关键词:
功能梯度材料
,
热应力
,
热传导
,
解析方法
,
数值方法
齐文娇
,
邓清华
,
丰镇平
,
袁奇
工程热物理学报
本文数值分析了层流和湍流两种流态下盘式透平的流动特性,并与实验结果进行了对比,考核了数值方法,重点分析了盘片转速对盘式透平流动特性的影响.结果表明t层流模型的数值计算结果与实验结果最接近,适于盘式透平的流动特性分析;盘式透平各部件损失规律与常规透平存在差异;随着轮盘转速提高,喷嘴损失基本保持不变,而轮盘损失系数先减小后增大,余速损失系数持续增加,这与常规透平不同;轮盘损失决定了盘式透平总损失的大小,在轮盘损失达到最小时,透平等熵效率达到最大值.
关键词:
盘式透平
,
数值方法
,
流动特性
,
等熵效率