Ye Yunxia, Nie Zeng, Huang Xu, Ren Xudong, Li Lin
School of Mechanical Engineering, Jiangsu University, Xuefu Road, Zhenjiang 212013, China.
Institute of Micro-Nano Optoelectronics and Terahertz Technology, Jiangsu University, Xuefu Road, Zhenjiang 212013, China.
Materials (Basel). 2021 Jan 19;14(2):462. doi: 10.3390/ma14020462.
Laser peen forming (LPF) is suitable for shaping sheet metals without the requirement for die/mold and without causing high temperatures. An analytical model for estimating the bending curvatures of LPF is convenient and necessary for better understanding of the physical processes involved. In this paper, we describe a new analytical model based on internal force balance and the energy transformation in LPF. Experiments on 2024 aluminum alloy sheets of 1-3 mm thickness were performed to validate the analytical model. The results showed that for 1 mm and 3 mm thick-thin plates, the curvature obtained by the analytical model changes from -14 × 10 mm and -1 × 10 mm to 55 × 10 mm and -21 × 10 mm, respectively, with the increase of laser energy, which is consistent with the experimental trend. So, when either the stress gradient mechanism (SGM) or the shock bending mechanism (SBM) overwhelmingly dominated the forming process, the analytical model could give relatively accurate predicted curvatures compared with the experimental data. Under those conditions where SGM and SBM were comparable, the accuracy of the model was low, because of the complex stress distributions within the material, and the complex energy coupling process under these conditions.
激光喷丸成形（LPF）适用于对金属板材进行成形，无需模具，且不会产生高温。建立一个用于估算激光喷丸成形弯曲曲率的解析模型，对于更好地理解其中涉及的物理过程既方便又必要。在本文中，我们描述了一种基于内力平衡和激光喷丸成形中能量转换的新解析模型。对厚度为1 - 3毫米的2024铝合金板材进行了实验，以验证该解析模型。结果表明，对于1毫米和3毫米厚的薄板，随着激光能量的增加，通过解析模型得到的曲率分别从-14×10毫米和-1×10毫米变为55×10毫米和-21×10毫米，这与实验趋势一致。因此，当应力梯度机制（SGM）或冲击弯曲机制（SBM）在成形过程中占主导地位时，与实验数据相比，解析模型能够给出相对准确的预测曲率。在SGM和SBM相当的情况下，由于材料内部应力分布复杂以及这些条件下复杂的能量耦合过程，模型的准确性较低。
