目的 提高侧围抵抗塑性变形的能力,改善侧围放件时因产生塑性变形而引起的凹陷、光斑扭曲等缺陷。方法 对零件的放件状态进行了理论分析,将零件受力模型简化为简支梁模型,依据该模型将零件划分为5个区,其中Ⅴ区体积严重影响放件变形缺陷的大小,利用Hypermesh+LS_Dyna有限元软件分析了3种方案放件变形后的应力、应变值,确定了最优方案,并进行了试验验证。结果 分别提取了3种方案Ⅴ区4个点的位移值用来分析该零件4个点处的位移变化状态,其中,方案一4个点的时间-位移图波动均较小,主要是因为方案一A点处的材料放件后会与安全工作平台产生软接触,释放一部分能量;方案二中A点及C点的极值均大于方案三中的,且方案二C点的应力值为179.6 MPa,塑性应变值较大,为0.083 6,说明方案二并不具有较好的吸能性能;方案三中C点的极值均小于方案二中的,且具有较小的应力值174.9 MPa和较小的塑性应变值0.059 3,说明方案三具有较好的吸能性能,为最优方案。结论 该实验结果进一步验证了简支梁模型和有限元分析结果的准确性,研究结果对零件放件变形方面的应用及研究具有参考和指导意义。
Abstract
The work aims to improve the resistance of the side panel to plastic deformation and to address defects such as dents and distorted light spots caused by plastic deformation during the placement of side panels. Theoretical analysis of the placement state of parts was conducted, and the force model of parts was simplified into a simply supported beam model. Based on this model, the parts were divided into five zones, where the volume of zone V seriously affects the size of deformation defects during placement. Hypermesh+LS-Dyna finite element software was used to analyze the stress and strain values of the three schemes after placement deformation, determine the optimal scheme, and conduct experimental verification. The displacement values of four points in Zone V of three different schemes were extracted to analyze the displacement changes at the four points of the part. Among them, the time displacement maps of the four points in Scheme One had a relatively small fluctuation range, mainly because the material at point A in Scheme One would make soft contact with the safety work platform after being placed, releasing some energy; The extreme values of the curves at points A and C in Scheme Two were both greater than those in Scheme Three, and the stress value at point C in Scheme Two was 179.6 MPa with a larger plastic strain value of 0.083 6, indicating that Scheme Two did not have good energy absorption performance. The extreme value of the point C in Scheme Three was smaller than that in Scheme Two, and it had a smaller stress value of 174.9 MPa and a smaller plastic strain value of 0.059 3, indicating that Scheme Three had good energy absorption performance and was the optimal scheme among the three schemes. In conclusion, the experimental results further validate the accuracy of the simply supported beam model and finite element analysis results, and the research results have reference and guiding significance for the application and study of part placement deformation.
关键词
简支梁模型 /
放件变形 /
有限元分析 /
凹陷 /
光斑扭曲
Key words
simply supported beam model /
deformation of part placement /
finite element analysis /
dents /
distorted light spots
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