| 王亚军*,王儒文,贺启林,周浩洋,王宇宁,姜昊,雷振坤*.0Cr18Ni9不锈钢材料断裂韧度的实验研究和数值分析[J].实验力学,2018,33(6):841~850 |
| 0Cr18Ni9不锈钢材料断裂韧度的实验研究和数值分析 |
| Experimental study and numerical analysis of fracture toughness of 0Cr18Ni9 stainless steel |
| 投稿时间：2017-09-27 修订日期：2017-11-14 |
| DOI：10.7520/1001-4888-17-316 |
| 中文关键词: 0Cr18Ni9不锈钢 断裂韧度 J积分 数字图像相关(DIC) 有限元方法 |
| 英文关键词:0Cr18Ni9 stainless steel fracture toughness J-integral digital image correlation(DIC) finite element method |
| 基金项目:国家自然科学基金(11472070, 11772081)资助 |
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| 中文摘要: |
| 从实验研究和数值分析两方面研究了0Cr18Ni9不锈钢材料的断裂韧度。首先，通过单轴拉伸测试得到0Cr18Ni9不锈钢材料的应力-应变曲线，并验证了该应力-应变曲线符合Ramberg-Osgood弹塑性本构模型，利用全局优化算法反演得到其弹塑性本构参数。然后，结合声发射技术和扫描电镜断口观察，确定了0Cr18Ni9不锈钢紧凑拉伸试样的起裂载荷和I型裂纹实际的起裂断裂韧度。进一步，根据数字图像相关方法得到的全场变形计算了J积分，J积分随时间逐渐增大； 最后，采用有限元法计算了起裂时沿裂纹前缘各处的J积分分布，发现J积分呈现中间较大、表面较小的分布特征，而且有限元计算的J积分平均值与从光学位移场数据计算的J积分接近。 |
| 英文摘要: |
| The fracture toughness of 0Cr18Ni9 stainless steel has been studied from two aspects: experimental study and numerical analyses. Firstly, the accordance between stress-strain relationship obtained by uniaxial tensile test and Ramberg-Osgood elasto-plastic constitutive model was verified, and elasto-plastic constitutive parameters were obtained by global optimization algorithm. Then, combining with acoustic emission technique and fracture section observation by scanning electron microscope (SEM), the crack initiation load of 0cr18ni9 stainless steel compact tensile specimen and the actual fracture toughness caused by type I cracks were determined. Furthermore, based on full-field deformation obtained from digital image correlation (DIC) method, J integral was calculated, which increases gradually with the time. At the same time, the distribution of J integral along crack front edge at the moment of crack initiation was calculated by finite element method. It is found that the distribution of J integral is larger in the middle and smaller on the surface. Moreover, the average value of J integral calculated by finite element method is close to that from optical displacement field data calculation. |
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