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为了研究爆炸焊接界面的剪切损伤行为,本文对铝-铝复合材料开展剪切试验,并基于分形理论对试件剪切断口界面进行表征,尝试建立界面剪切强度与断口轮廓分维值及其多重分形谱关系。结果表明,焊接界面剪切强度随加载速率升高而降低,异于通常金属剪切行为;但从断口形貌及其轮廓分形维可认识界面剪切强度变化原因。此外,多重分形谱起点与终点间的高度差和跨度差值反映了界面的峰、谷落差及分布特征,是界面形貌特征的立体反映,并在数值上也与剪切强度正相关。
In order to study the shear damage behavior at the interface of explosive welding, the shear tests of aluminum-aluminum composites were carried out. Based on the fractal theory, the shear fracture interface was characterized, and the interfacial shear strength, Its multifractal spectrum relationship. The results show that the shear strength of the welded interface decreases with the increase of the loading rate, which is different from the usual metal shear behavior. However, the reason of the change of the interfacial shear strength can be recognized from the fracture morphology and the fractal dimension. In addition, the difference between the height difference and the span between the start point and the end point of the multifractal spectrum reflects the peak, valley drop and distribution characteristics of the interface, which is a stereoscopic reflection of the interface topography characteristics and is also numerically related to the shear strength.