crack

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 spall fracture mechanism and numerical simulation of no-Co-alloy steel;

无钴合金钢的层裂断裂及数值模拟研究

Thus,the base is formed for fracturing fracture extendly orientation prediction and proper well pattern modification of oilfield development, also provided theoritical basis for high efficient and reasonable developm.

以辽河盆地冷４３断块需要压裂投产的深层巨厚稠油油藏为例，运用井壁崩落、水力压裂、岩心分析等方法确定该油田最大水平主应力方位和大小，为该类油藏压裂裂缝延伸方向的预测和油田开发井网的合理部署奠定了基础，也为类似油藏的高效合理开发提供了理论依据。

The reason for ineffective fracture in Shanian area of Jiangsu oilfield was analysed.

分析了SN油田裂缝失效的原因,在对重复压裂裂缝延伸方式与时机研究的基础上,优化选井选层,优化施工设计,开展了10口井重复压裂现场施工,取得了很好的应用效果。

The blockages can be removed in the fracture,which results in the recovery of diverting capacity,the enhancement of well productivity and great stimulation effect.

在分析中原油田压裂伤害的基础上 ,经过室内研究 ,研制出了压裂裂缝处理剂FFA和FFB。