论文部分内容阅读
1.绪言为确保球形容器的安全使用,要对本体进行打开检查和磁粉探伤试验,那时,就可能发现许多磁粉花纹。这些花纹极其细微,它们的成因和发生时间都不是很明确的。作为弄清这些问题的一种方法,对60kgf/mm~2级高强度钢的焊接试样作了研究,在试样中有意制作了类似磁粉花纹的微小缺陷(低温裂纹等),并研究了防止办法。对长度在10mm 以下,深度在1.5mm 以下的裂纹称为“微小缺陷”。另外,为全面掌握这种微小缺陷扩展的静负荷和动负荷方面的条件,还运用了断裂力学的观点对存在有微小缺陷的球形容器的
1. INTRODUCTION In order to ensure the safe use of spherical containers, open inspection and magnetic particle inspection of the body are required. At that time, many magnetic patterns may be found. These patterns are extremely subtle, their causes and timing are not very clear. As a method of clarifying these problems, welding samples of 60 kgf / mm ~ 2 high-strength steel were studied, minute flaws resembling magnetic patterns (such as low-temperature cracks) were deliberately produced in the sample, and the Prevent ways. For the length of 10mm or less, the depth of 1.5mm or less crack called “tiny defects.” In addition, in order to comprehensively grasp the conditions of static load and dynamic load extended by such small defects, the concept of fracture mechanics is also applied to the spherical container in which there is a slight defect