汽车钢板冲压性能的内耗谱表征

测量了未出现上下屈服点的常规汽车钢板和出现冲压变形滑移带、“橘皮”等不均匀变形钢板在室温至350°C的内耗，并对钢板阻尼峰的本质和力学谱特征进行分析.结果表明，冲压性能不同的钢板内耗谱明显不同.常规钢板的内耗曲线上出现了3个较小的内耗峰；出现冲压变形滑移带的钢板中呈现出2个较高的内耗峰；而出现“橘皮”的钢板中则呈现出4~5个很小的内耗峰.

Mechanical Spectroscopy Characterization of Forming Property of Automobile Steel Sheets

The internal friction in low carbon aluminium killed DC01 automobile steel sheets, which are of normal without super lower yield point, and of inhomogeneous stamping deformation containing Lüders bands and/or orange skin, were measured from room temperature to 350°C. It is found that for the automobile sheets with different stamping performancies their mechanical spectra have obviously different characterstics. There is a mechanical spectrum with three small peaks for the normal sheet, and there appears a double peak spectrum in which the two peaks are all obviously high for the sheet with Lüders bands, and there is a multi peak spectrum having 4 to 5 very small peaks for the sheet with orange skin. The discussion on the nature of the damping peaks and the characteristic of the mechanical spectra was made.