不同加载速率下铆钉材料变形研究

对LY10、TB

On The Deformation of Rivet Materials under Different Loading Rate

Aiming at improving the quality of electro magnetic riveting(EMR), and eliminating cracks in rivet heads, we studied the deformation of some rivet materials in different loading rate by microcosmic analysis. Fig.1 gives the schematical diagram of EMR. By adjusting the capacitance of the riveter, we carried out riveting experiments at three different loading rate for three kinds of rivet materials. Table 1 gives the parameters of experiments, Figs.2 through 4 illustrate metallographs of three rivet heads at different loading rate. We get the following conclusions by analyzing these figures: (1) The loading rate of EMR has great influence on the deformation of rivet materials. (2) The materials riveted by EMR undergo adiabatic shear forming, microcracks will appear if the loading rate is too high. (3) The reason that cracks appear in TB 2 1 rivet heads is that the loading rate of existing high voltage electro magnetic riveter is too high, their capacitance should be increased to lower their loading rate.