超硬铝合金整体精车加工成型壳体外压稳定性研究

对超硬铝合金整体精车加工成型壳体进行了外压稳定性研究，包括环助加筋壳的总体稳定性和肋间短亮的局部稳定性。给出了6个短壳试件的试验结果和3个环助加筋壳试件的试验结果。研究结果表明：由于超硬铝合金材料的高屈服极限和整体精车加工成型壳体的结构整体性高精度（包括几何形状和尺寸），短壳临界外压比过去试件（用低屈服极限材料LF3M和LF6M，报金件冲压成型-焊接组装工艺，下同）的试验结果平均提高了50％以上，环肋加筋壳总体失稳的临界外压比过去试件的试验结果平均提高了近30％。

The Stability of shells made of superhard aluminum alloy and formed integrally by precise turning under the external pressure

The stability of cylindrical shells, which are made of superhard aluminum alloy and formed integrally by precise turning, under the external pressure is discussed in this paper. It includes the general stability of ring-stiffened shells and the local stability of short shells between ribs. The test results of 6 short shells and 3 ring-stiffened shells are presented. The test results given ift this paper show that the values of the critical pressure of this kind of shells are increased by about 30~50%. It is mainly because of the high yield limit of superhard aluminum alloy, the structrual integrality and the high pecision of this kind of shells.