段丽明,洪志波,廖辉,等.CFRP/Al夹层板电磁冲孔分层缺陷研究[J].精密成形工程,2021,13(4):67-75.
DUAN Li-ming,HONG Zhi-bo,LIAO Hui,et al.Study on Delamination Defect of Punched Holes in Hybrid CFRP/Al Stacks Produced by Electromagnetic Punching[J].Journal of Netshape Forming Engineering,2021,13(4):67-75. |
| CFRP/Al夹层板电磁冲孔分层缺陷研究 |
| Study on Delamination Defect of Punched Holes in Hybrid CFRP/Al Stacks Produced by Electromagnetic Punching |
| 投稿时间：2021-04-09 |
| DOI：10.3969/j.issn.1674-6457.2021.04.010 |
| 中文关键词: 碳纤维增强复合材料 铝合金 电磁冲孔 分层缺陷 |
| 英文关键词: CFRP aluminum alloy electromagnetic punching delamination defect |
| 基金项目:国家自然科学基金(52005173);博士后创新人才支持计划(BX20200123);长沙市自然科学基金(kq2014047) |
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| 中文摘要: |
| 目的 研究不同放电能量对CFRP/Al夹层板电磁冲孔分层缺陷的影响。方法 对2.4 mm厚的CFRP/Al夹层板进行电磁冲孔试验，通过超声C扫描无损检测技术、扫描电子显微镜及有限元数值模拟等手段分别对板料分层损伤、横截断面微观形貌及层间分层损伤进行评估，揭示不同放电能量对CFRP/Al夹层板电磁冲孔分层缺陷的影响。结果 放电能量对电磁冲孔分层缺陷有显著影响。在4~6 kJ能量范围内，板料的最大分层因子(Fd)和等效分层因子(Fed)均随放电能量的增加而减小。当放电能量为7 kJ时，等效分层因子Fed仍然减小，但由于高速载荷作用下局部损伤的存在，使板料的最大分层因子Fd骤然上升，并超过了放电能量为4 kJ时的最大分层因子。结论 在合理的能量范围内(4~6 kJ)，随着放电能量的增加，能够明显提升CFRP/Al夹层板电磁冲孔的质量，但当放电能量过高(≥7 kJ)时，会产生额外的分层缺陷，影响冲孔质量。 |
| 英文摘要: |
| The aim of this paper is to investigate the effect of different discharge energy on the delamination defect of holes produced by electromagnetic punching for hybrid CFRP/Al stacks. For this purpose, the electromagnetic punching experiments were carried out on hybrid CFRP/Al stacks with a thick of 2.4 mm. By means of ultrasonic C-scan technology, scanning electron microscope and numerical simulation, the delamination damage of CFRP/Al stacks, microstructure of cross section and interlaminar delamination damage were evaluated, revealing the influence of discharge energy on the delamination defect of CFRP/Al stacks. The results showed that the discharge energy had significant effects on the delamination defect of the punched holes. In the range of 4 kJ to 6 kJ, the delamination factors (Fd and Fed) decreased with the increase of discharge energy. When the discharge energy is 7 kJ, the equivalent delamination factor Fed of CFRP/Al stacks still decreased, while the maximum delamination factor Fd rose abruptly and exceeded the maximum delamination factor when the discharge energy was 4 kJ. This was due to the presence of local damage under the action of high speed loading. Therefore, it could be concluded that, within a reasonable energy range (4~6 kJ), the electromagnetic punching quality of CFRP/Al stacks was significantly improved with the increase of discharge energy. However, when the discharge energy was too high (≥7 kJ), additional delamination defects would occur, affecting the punching quality. |
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