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针对飞机用7050高强铝合金含孔板件进行拉伸性能与断裂韧性的模拟分析与实验研究,并基于裂纹尖端塑性钝化能将常见拉伸性能与平面断裂韧性联系起来,在常规拉伸性能参数的基础上,定量计算出了含孔连接板的断裂韧性值,通过引入与试样几何形状、孔型大小有关的Z参数,表征了含孔构件断裂失效过程中的平面应力和平面应变分布状态与组成比例。研究表明:(1)Z参数联系了材料断裂韧性与构件断裂韧性,反映了含孔构件的几何形状与开孔大小对构件断裂韧性值的影响;(2)含孔拉伸试样的断裂韧性敏感于开孔在垂直于拉伸方向上的尺寸,并随该尺寸的增加而降低;(3)含孔拉伸试样的屈服应力,强度极限等强度指标主要受开孔沿垂直于拉伸方向的尺寸影响,而几乎与开孔在拉伸方向上的尺寸变化无关,但含孔拉伸试样的延伸率则正好与此相反。
According to the simulation analysis and experimental research on the tensile properties and fracture toughness of 7050 high strength aluminum alloy orifice plate for aircraft, the common tensile properties and plane fracture toughness can be related based on the plastic passivation of crack tip, The fracture toughness of the hole-containing plate is calculated quantitatively. By introducing the Z parameter related to the sample geometry and pore size, the plane stress and the plane strain distribution in the failure process of the hole-containing member are characterized Status and composition ratio. The results show that: (1) The Z parameter is related to the fracture toughness of the material and the fracture toughness of the member, which reflects the influence of the geometry and the size of the pore-containing member on the fracture toughness of the member. (2) The fracture toughness Sensitive to the size of the opening in the direction perpendicular to the stretching direction, and with the size increases; (3) yield stress, strength limit and other indicators of the hole-containing tensile strength is mainly affected by the opening along the perpendicular Direction, and almost independent of the size change of the opening in the direction of stretching, but the elongation of the sample containing holes is just the opposite.