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根据工程构件常呈现局部高应变梯度的特征而不是全面屈服状态的事实,本文提出了高应变区中LiCOD表达式。将其与从Dugdale-Muskhelivili模型导得的低应力范围内的COD表达式相结合,即可得到全部应力应变范围内的COD表达式。作者设计了两种SCT试样,试验结果表明:在很大的应力应变范围内,该表达式计算值与试验数据相符。试验还证明:SCT试样成功地再现了实际工程构件(如压力容器接管)高应变梯度区的特征,且不再出现宽板标定曲线的COD冻结等奇异现象,从而证明该表达式可以应用于工程结构。
According to the fact that engineering components often show the characteristics of locally high strain gradients instead of the total yield state, LiCOD expression in high strain region is proposed in this paper. Combining this with the COD expression in the low stress range derived from the Dugdale-Muskhelivili model gives the COD expression over the entire stress-strain range. The authors designed two SCT samples and the results show that the calculated values agree well with the experimental data over a large stress-strain range. The experiment also proves that the SCT sample successfully reproduces the characteristics of the high strain gradient zone of the actual engineering component (such as the pressure vessel takeover), and no longer appears the singular phenomenon of the COD freeze of the calibration curve of the wide plate, thus proving that the expression can be applied to Engineering structure.