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实践表明,金属板料在板平面与厚度方向之间的塑性異性,以及材料的应变刚,两者皆对其压延性能有利。本文从理论上分析了它们与压延性能之间关系,并进而提出一种定量评定板料压延性能的方法(计算极限压延系数),此时只须进行简单的拉伸机械试验即可。解决该问题的关键在于,如何可靠地确定压延危险断面强度。为此,本文考虑到上述的板料各向异性及应变刚的综合作用,并利用板料在复杂应力状态下的受拉失稳条件,得出了压延危险断面强度的计算公式。该公式本身以及计算极限压延系数的方法,其可靠性为七种板料的试验研究结果所证实。 本文为作者在北京航空学院付教授唐荣锡指导下,所完成的研究生毕业论文之一部分。在实验工作方面得到实验室同志的大力支持,在此顺致谢意。
Practice shows that the plastic sheet metal in the plane between the thickness and direction of the plastic anisotropy, as well as the material strain of just, both of its favorable rolling performance. In this paper, the relationship between them and the rolling properties was analyzed theoretically, and then a method of quantitatively evaluating the rolling properties of the sheet metal was proposed (the ultimate rolling factor was calculated). In this case, only a simple tensile mechanical test was needed. The crux of the solution to this problem lies in how to reliably determine the strength of the rolled cross-section. Therefore, this paper takes into account the combined effects of the above-mentioned sheet metal anisotropy and strain hardening, and obtains the formula for calculating the strength of the rolled cross-section by using the unstressed condition of the sheet under complex stress conditions. The formula itself as well as the method of calculating the ultimate calendering coefficient, the reliability of which is validated by the experimental study of seven blanks. This article is part of a graduate thesis completed under the guidance of Professor Tang Rongxi, a professor at Beijing Institute of Aeronautics. I am grateful to have the strong support of lab comrades in the experimental work.