基于激光毛化技术的5052铝合金粘接试验研究

为了提高5052铝合金的粘接性能,利用脉冲光纤激光的短脉冲和高峰值功率的特性,对铝合金试件进行了激光毛化试验研究。通过正交实验法,研究了平均功率、扫描速度、脉冲频率和脉冲宽度等工艺参数对激光毛化质量的影响,以及各工艺参数的影响权重,并求得最佳工艺参数,最佳工艺参数为平均功率90 W、扫描速度10 mm/s、脉冲频率1000 kHz、脉冲宽度200 ns。根据优化后的工艺参数,加工获得了粗糙度2.35 μm,然后对激光毛化后的铝合金试件进行单搭接拉伸试验,研究发现粘接强度随着粗糙度的增大而增大,当粗糙度到达一定程度时,粘接强度反而会随着粗糙度的增大而减小。另外,粘接强度还跟铝合金表面的微织构的类型及疏密程度都有很大关系。     

Tensile property of cord reinforced rubber composites laminate double lap jointEI北大核心CSCD

According to the structural connection form of cord reinforced rubber composite，structural test samples with different lapping process parameters were designed and prepared. The dynamic and static tensile properties were studied by using two-dimensional digital image technology. The test results were as follows：The stiffness and tensile strength of double lap composites joints increased as the strain rate increasing，while the elongation at break unchanged. Compared with the no-lap samples，the tensile strength of the double lap composites sample was reduced by nearly 50%，and with the increase of the lap width，the elongation at break gradually decreased. The samples with lap width of 65 mm decreased by 24% compared with the no-lap ones. Compared with the elastic modulus of stage II，the elastic modulus of stage III increased significantly，that of the no-lap samples increased by 3 times，that of the lap samples were doubled，and the amplification of elastic modulus decreased with the increase of strain rate. © 2023, Youke Publishing Co.,Ltd. All rights reserved.