基于数字图像相关方法的矿用扁平接链环模型接触变形实验研究

Experimental investigation on contact deformation of mining flat type chain connector model based on digital image correlation

采用分割辅助数字图像相关方法.针对矿用扁平接链环模型在多齿啮合状态下的接触变形进行了实验分析,测量了该结构在承受拉伸载荷时的全场变形分布,并对其接触面附近区域的应变集中现象进行定性与定量分析。实验以026mm X 92mm规格的梯齿型接链环模型为研究对象,提出了相应的多分辨率方法进行接触变形场测量。方法中仅采用单个相机实现多分辨率测试,从而避免了传统多分辨率方法中的图像修正误差。采用降采样后的图像计算试件的全场变形,以实现高效的应变分布分析以及应变集中区域定位;采用高分辨率图像进行局部变形计算,以分析应变集中区域的变形分布。实验结果表明,接链环第II对和第m对啮合齿的齿根部发生的变形最大,是接链环的薄弱部位。该实验结果为梯齿型接链环的变形规律分析和结构设计提供了有效的实验依据。

The segmentation-aided digital image correlation(SA-DIC)method is used to analyze the contact deformation of mining flat type chain connector model in the multi-tooth meshing state.The full-field deformation distribution of this structure under tensile load is measured,and the strain concentration phenomenon in the vicinity of contact surface is analyzed qualitatively and quantitatively.The experiment takes①26mm X 92mm ladder-toothed chain connector model as the research object,and the corresponding multi-resolution method to measure the contact deformation is proposed.In this method,only a single camera is used to implement multi-resolution testing,thereby avoiding image correction errors in the conventional multi-resolution method.The subsampled images are used to calculate the full-field deformation of the specimen so as to achieve efficient strain distribution analysis and position the strain concentration regions.The high-resolution images are used for local deformation calculation to analyze the deformation distribution of the strain concentration regions.The results show that the deformation of the root of the second pair and the third pair of teeth is the largest,which is the weakest part of the chain connector.The experimental results provide an effective experimental basis for the analysis of the deformation law and structural design of the ladder-toothed chain connector。