3.国内外的若干新成果上述计算只能用来求球罐的开裂应力。常温下工作的大多数中低强度钢球罐,开裂后要经过慢长的稳定扩展才会出现失稳破坏。国内几种钢制带缺陷压力容器实测的开裂压力及失稳破坏压力见表2及图6。破坏压力较开裂压力高。这是因为大多数中低强度容器 3. Several new achievements at home and abroad The above calculation can only be used to determine the cracking stress of the spherical tank. Most of the medium and low-strength steel spherical tanks that work at room temperature will undergo instability after long-term stability expansion after cracking. The cracking pressure and instability failure pressure measured by several steel defective pressure vessels in China are shown in Table 2 and Figure 6. The breaking pressure is higher than the cracking pressure. This is because most medium and low intensity containers