【摘要】 目前很多文献都是不加证明的将开裂因子RI作为破坏准则用于连接分析中,即认为当计算中的开裂因子RI值超过了某给定值,便认为该处开裂,此时便停止计算。但是RI值是否是恒定的值,这需要去验证。因此,为了验证RI值是否是恒定的值,对开孔矩形板试件进行了单向拉伸试验,并进行了数值模拟。发现数值模拟结果与试验曲线吻合较好,说明数值模拟的应力场可以用于理论分析。随后,分析了数值模拟的应力场,发现用开裂因子RI可以定性地预测金属材料的初始开裂位置及扩展,但是,RI值有很大波动。其原因可能是试验所观察到的裂纹并不是第一条微观裂纹,或是RI值并不是恒定的,是随条件在发生变化。更多还原

【Abstract】 There were many literature didn’t probative rupture index RI if it was right,they used it by way of destroy rule.They thought when calculational RI exceeded a certain fixed value,there were craze,we could stop calculation.But if RI was fixedness,we need do validate.For validate rupture index RI,we article did fracture tests on rectangle plates with circle hole.We also did numerical simulation.By contrasting the results of experiment and numerical simulation,we found that numerical simulation results fit preferably with experiment carves.So,the stress field of numerical simulation could be used theory analysis.After using rupture index RI for study constructional steel fracture,we found that RI had some undulation for different specimens.The reasons may be that recorded crack isn’t the first one in tests,or may be that RI exist some problem in forecasting constructional steel fracture.These problems must be researched further.更多还原