为描述材料在塑性成形中的复杂硬化行为,提出了一种基于三次贝塞尔曲线的屈服轨迹离散插值型描述方法,以及后继屈服轨迹演化模型。针对Khan A S等采用Al6061-T6511铝合金进行拉伸-扭转复合预加载后,采用10-5量级的屈服应变阈值时,二维...为描述材料在塑性成形中的复杂硬化行为,提出了一种基于三次贝塞尔曲线的屈服轨迹离散插值型描述方法,以及后继屈服轨迹演化模型。针对Khan A S等采用Al6061-T6511铝合金进行拉伸-扭转复合预加载后,采用10-5量级的屈服应变阈值时,二维应力空间屈服轨迹表现出极其强烈的大小、中心点和形状变化的实验结果,构造了相应的离散插值型屈服轨迹数值模型,通过拟合实验结果得到了各预应变条件下的曲线参数;提出了描述后继屈服轨迹大小、中心点和形状变化的拟合模型以描述材料的各向同性强化、随动强化和畸变强化行为。与采用应力不变量的建模方法相比,这种屈服模型是依据屈服轨迹的几何形状建立的,具有较大的灵活性。展开更多
To reduce the shielding effect of hardened layers on electrical resistivity tomography,a ratio method based on the distortion correction principle and the isolation coefficient is proposed.The effects of the resistivi...To reduce the shielding effect of hardened layers on electrical resistivity tomography,a ratio method based on the distortion correction principle and the isolation coefficient is proposed.The effects of the resistivity and thickness of hardened concrete layers on the detection of target objects are explored.Both numerical simulations and indoor tank tests indicate that when the ratio method is employed to correct the original collected data,the maximum allowable error for the isolation coefficient should not exceed 1%.Notably,when the ratio of hardened layer thickness to electrode spacing does not exceed 1,correction through this method significantly enhances the recognition capability of target objects.However,when the hardened layer thickness is greater than the electrode spacing by a factor of 2 or more,the ratio method cannot achieve satisfactory results.The case study of flood control engineering detection in the Zhangxi section of the Huangpen River in Dongzhi County demonstrates that the detection effect after correction by the ratio method is comparable to that for the adjacent unhardened pavement,and the influence of the hardened layer is obviously weakened,resulting in more reliable results.展开更多
文摘为描述材料在塑性成形中的复杂硬化行为,提出了一种基于三次贝塞尔曲线的屈服轨迹离散插值型描述方法,以及后继屈服轨迹演化模型。针对Khan A S等采用Al6061-T6511铝合金进行拉伸-扭转复合预加载后,采用10-5量级的屈服应变阈值时,二维应力空间屈服轨迹表现出极其强烈的大小、中心点和形状变化的实验结果,构造了相应的离散插值型屈服轨迹数值模型,通过拟合实验结果得到了各预应变条件下的曲线参数;提出了描述后继屈服轨迹大小、中心点和形状变化的拟合模型以描述材料的各向同性强化、随动强化和畸变强化行为。与采用应力不变量的建模方法相比,这种屈服模型是依据屈服轨迹的几何形状建立的,具有较大的灵活性。
基金National Key Research and Development Program of China(No.2021YFC3000103).
文摘To reduce the shielding effect of hardened layers on electrical resistivity tomography,a ratio method based on the distortion correction principle and the isolation coefficient is proposed.The effects of the resistivity and thickness of hardened concrete layers on the detection of target objects are explored.Both numerical simulations and indoor tank tests indicate that when the ratio method is employed to correct the original collected data,the maximum allowable error for the isolation coefficient should not exceed 1%.Notably,when the ratio of hardened layer thickness to electrode spacing does not exceed 1,correction through this method significantly enhances the recognition capability of target objects.However,when the hardened layer thickness is greater than the electrode spacing by a factor of 2 or more,the ratio method cannot achieve satisfactory results.The case study of flood control engineering detection in the Zhangxi section of the Huangpen River in Dongzhi County demonstrates that the detection effect after correction by the ratio method is comparable to that for the adjacent unhardened pavement,and the influence of the hardened layer is obviously weakened,resulting in more reliable results.