Crack tip opening angle and its application to crack arrest in gas pipeline;
裂纹尖端张开角及在输气管线止裂预测中的应用
It is reviewed that research achievement of pipeline cracks arrest,It shows that the formula of pipeline crack arrest in 1970s was inclined to danger for determining cracks arrest behavior of high toughness pipeline through objects test.
回顾了管线裂纹止裂研究的成果,通过实物试验分析表明,20世纪70年代的止裂公式在确定高韧性管线的止裂行为上已偏于危险。
Using theory of electro-thermal effects, tests of crack arrest were executed on gunsteel.
利用材料的电热效应对炮钢进行裂纹止裂实验,并对裂纹尖端材料进行金相组织分析。
The certain method of transfer gas pipeline crack arrest ductility is discussed and analysised,and respective merits and faults is listed.
介绍输气管道止裂方法和构件,讨论分析了输气管道止裂韧性的确定方法及各自的优缺点,并重点评析裂纹尖端张开角的预测模型;全面列举止裂所需最低夏比冲击功计算公式及近年来这方面取得的成果,并指出今后的发展趋势和研究方向,为管道设计和安全维护提供一些参考。
For the West-east pipeline project to be put into construction,the problems in technology first to be solved are the fracture arrest of pipeline.
而在输送压力和钢材等级提高以后,延性断裂及其止裂成为主要的研究领域。
There are many instances where fluid pressure acting on the structure caused the structure to cracking and the cracks could be propagated rapidly or arrestded,which is regarded as the most advanced research field in dynamic fracture.
许多工程问题是由于流 (气 )体压力导致了结构开裂 ,裂纹会迅速扩展或者止裂 ,这被认为是断裂动力学最前沿的研究领域。
Experimentation and numerical simulation analysis on half-embedding crack preventing in metal die of 9Cr2 steel using electromagnetic heating;
9Cr2凸模半埋藏疲劳裂纹电磁热止裂的实验与模拟研究
The crack preventing has been obtained around the quenching crack tip inside cavity die of 9Cr2 steel through the pulse current discharge and .
９Ｃｒ２凹模淬火裂纹经脉冲放电止裂和电火花熔焊的搭桥修复后，裂纹尖端钝化，模具表面的淬火裂纹被焊合，模具的承载能力和表面光洁度可达到使用要求。
The experdriental results show that the crack preventing fora current conductor with cracks by the heat effect of electro-magnetic not only is feasible, but also has many advantages,such as keeping outside force, simplicity, efficiency, and im-proving toughness and so on.
介绍了导电体内部裂纹止裂的一种新实验方法。
Furthermore,it also gives some summary about the integrity management,HTP rolling procedure,ductile fracture arrest of high grade steel,strain-based design,and development of high deformability steel.
针对完整性管理、高温轧制工艺(HTP)、高钢级管线钢的韧性止裂、基于应变的设计以及抗大变形钢的开发等做了概括性论述。
Advance of research on crack arrest in metal die by using electromagnetic heating;
金属模具电磁热裂纹止裂研究的新进展
Using theory of electromagnetic heat effect, the possibility of crack arrest in highspeed steel under super-intention pulses electric current was studied.
利用电磁热效应原理，探讨了超强度脉冲电流对高速钢裂纹止裂的可能性结果表明，利用电磁热效应可在裂纹尖端形成焊口，使裂纹尖端的曲率半径增大，抑制了裂纹扩展同时，对裂纹尖端热影响区的组织进行了分析，讨论了裂纹尖端的组织变化对止裂效果的影响。
How to produce powerful pulse current is a key problem in the crack arrest by electromagnetic heat effect.
由于脉冲放电快速加热和冷却,在裂纹尖端处实现了冲击淬火,得到了超细化的隐晶马氏体和细粒碳化物等微观组织,提高了裂纹尖端处的硬度、强韧性和耐磨性,试验结果验证了该装置的有效性,本文的成果为采用电磁热效应对金属模具裂纹止裂提供了实验技术基础。
The fracture toughness K1d and J1d , arrest toughness K1a and Charpy V-notched impact toughness Ak of a pipeline steel, X70, were studied at different temperatures.
在不同温度下测试了X70管线钢动态断裂韧度K1d、J1d和止裂韧度K1a以及夏氏V型缺口冲击韧度Ak,对三者的关系进行了分析。