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对 LY1 0、TB2 - 1和 NSA5 41 5等三种铆钉材料在不同加载速率下的变形进行微观研究 ,结果表明采用电磁铆接这种冲击加载 ,铆钉镦头会出现应变集中带或绝热剪切带。散热性能较差的TB2 - 1铆钉对应变率较敏感 ,铆接时镦头中将出现绝热剪切带。随着加载速率的提高 ,绝热剪切带中的变形量愈来愈大 ,最终出现微裂纹或剪切破坏。为保证电磁铆接的质量 ,应选择合适的加载速率。现有电磁铆接设备的加载速率偏高 ,不适合 TB2 - 1等铆钉材料的铆接 ,应增大其电容量 ,以降低加载速率。为扩大电磁铆接设备的适用范围 ,使其电容量可调 ,以满足不同材料对加载速率的要求。
The deformation of three rivets, LY1 0, TB2 - 1 and NSA5 41 5, at different loading rates was studied microscopically. The results show that there is strain concentration zone or adiabatic shear zone . TB2 - 1 rivets with poor thermal performance are more sensitive to strain rate, adiabatic shear bands appear in heading heads during riveting. As the loading rate increases, the amount of deformation in the adiabatic shear band becomes larger and larger, eventually resulting in microcracks or shear failure. To ensure the quality of electromagnetic riveting, should choose the appropriate loading rate. Existing electromagnetic riveting equipment, high loading rate, not suitable for riveting TB2 - 1 other riveting materials, should increase its capacitance, in order to reduce the loading rate. To expand the scope of application of electromagnetic riveting equipment to make its capacitance adjustable to meet the different materials on the loading rate requirements.