喷丸处理对机翼加筋壁板压缩强度的影响

发布时间：2018-11-16 10:05

【摘要】：现代大型飞机机翼壁板广泛采用喷丸成形和强化工艺,但喷丸处理对加筋壁板静强度性能的影响研究较少,目前工程上还难以定量评估。通过对壁板失效模式的分析,梳理了喷丸处理影响机翼壁板压缩强度的主要因素,即剖面压损强度以及压缩模量,规划了典型机翼上壁板喷丸试件和未喷丸试件的压损对比试验,研究了喷丸处理对压损强度和局部屈曲载荷的影响。试验结果表明:喷丸后壁板的压损强度和局部屈曲载荷均有所降低。根据试验结果提出了采用基于喷丸处理前后压损应力下降幅度确定的喷丸影响系数κ1,以及压缩模量下降幅度确定的喷丸影响系数κ2修正JOHNSON-EULER方程的方法。该方法客观准确地将喷丸处理影响计入到加筋壁板的压缩强度设计中,实现了对喷丸处理影响的定量评估,工程应用简便易行。
[Abstract]:Shot peening and strengthening are widely used in the wing panels of modern large aircraft, but the effect of shot peening on the static strength of stiffened panels is less studied, so it is difficult to evaluate quantitatively in engineering at present. Based on the analysis of the failure mode of the panel, the main factors that affect the compression strength of the wing panel by shot peening, namely, the compression loss strength and the compression modulus of the wing panel, are analyzed. In this paper, a comparative test of the pressure loss of a typical wing with and without a shot peening specimen is planned, and the effect of shot peening on the compressive strength and the local buckling load is studied. The experimental results show that the compression loss strength and local buckling load of the slabs are decreased after shot peening. Based on the experimental results, a method for revising the JOHNSON-EULER equation is proposed, which is based on the shot peening coefficient 魏 1, which is determined by the drop range of pressure loss stress before and after shot peening treatment, and the shot peening effect coefficient 魏 2, which is determined by the reduction range of compression modulus. In this method, the effect of shot peening is taken into account in the compression strength design of stiffened panel objectively and accurately, and the quantitative evaluation of the impact of shot peening is realized, and the engineering application is simple and convenient.
【作者单位】：中航工业第一飞机设计研究院;
【基金】：航空科学基金(2012ZB53012)
【分类号】：TG668

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