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1·Longitudinal crack of drill pipe box joint is brittle fracture at low stress.

钻杆接头的各种纵向开裂属于低应力脆性断裂。

2·For shape of CC beam blank is complex, there are more rate of longitudinal crack on the surface.

连铸异型坯由于其形状复杂，表面纵裂纹发生率较高。

3·Objective to discuss the cause of longitudinal crack in high-fill roadbed and treatment countermeasure.

目的：探讨高填方路基纵向裂缝产生的原因和处理对策。

4·Conclusion it has favorable effect adopting the grouting technique to deal with longitudinal crack in high-fill roadbed.

结论：采用压浆技术对高填方路基纵向裂缝进行处理具有良好效果。

5·The study focused on the relation between upstream flow velocity and surface longitudinal crack under the condition of blowing gas.

本文针对板坯结晶器内的钢液流动特征进行了物理模拟，重点研究了吹气条件下流场的上循环速度与表面纵裂纹的关系。

6·The results show that the surface longitudinal crack of hot-roll Q345B medium plate is caused by inclusion and surface longitudinal crack of slab.

结果表明，热轧Q 345 B中厚板表面纵裂纹是由于铸坯中存在夹杂物及铸坯纵裂引起的。

7·We analyse the formation Cause of longitudinal crack of the strip in double - roll strip continuous casting using metallographic technique and electron microprobe.

用金相技术结合电子探针对双辊薄带连铸带坯的纵裂纹成因进行了分析。

8·Materials and methods: Making the animal model of the longitudinal crack and horizontal defect on the weight-bearing area and non weight-bearing area of the medial femoral condyle on rabbit.

材料和方法：制做兔股骨内髁关节软骨负重区和非负重区纵行裂伤和水平缺损动物模型。

9·Normal service life of U74 heavy rail and service life of the damaged rail are estimated by fracture dynamical analysis and possible mechanism on the longitudinal crack on the rail discussed.

通过断裂力学分析，估算出u 74重轨的正常使用寿命及伤轨残余使用寿命；探讨了钢轨纵裂的可能机制。

10·The stress required for producing internal crack decreases since there are loci of cracks in the slab caused by the surface crack, so the longitudinal cracks from inner to surface form easily.

由于铸坯表面裂纹形成的裂纹灶，降低了产生内裂所需要的应力值，易于形成内、外相连的纵裂。