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由于边侧稀疏波的作用,爆炸焊接界面边界与中心区域形貌结构存在差异。然而学术上对焊接界面形貌差异分析仍处于定性水平,尚未建立定量分析方法。据此,尝试对爆炸焊接界面形貌差异开展定量化评价。研究过程中首先建立冲击波作用下金属复板弹粘塑性模型以分析波状界面的形成,并开展2024Al对称爆炸焊接;随后运用三维超景深显微镜获得界面形貌图像,结合冲量理论,定义中心区域与边侧区域分界线;最后基于分形理论计算图像轮廓分维与多重分维谱。由分维与多重分形谱数据可定量表征界面的起伏程度与表面最大、最小概率分布,从而实现焊接界面形貌差异定量描述。
Due to the effect of the edge-side sparse wave, there is a difference between the boundary of the explosive welding interface and the topography of the central area. However, the academic analysis of the morphological differences of the weld interface is still at a qualitative level, and no quantitative analysis method has been established yet. Accordingly, try to quantitatively evaluate the difference of topography of explosive welding interface. In the process of research, firstly, the visco-plastic model of metal lamella was established to analyze the formation of wavy interface and the 2024Al symmetric explosion welding was carried out. Then, the interface topography was obtained by using three-dimensional super-depth microscope and the impulse theory was used to define the central region and edge Lateral boundary line; finally, based on the fractal theory to calculate the image contour fractal dimension and multi-fractal dimension. Fractal and multifractal spectrum data can quantitatively characterize the fluctuation of the interface and the maximum and minimum probability distribution of the surface, so as to realize the quantitative description of the difference of the topography of the welding interface.