Comparative Study on Fatigue Properties of Al-Al-steel and Al-Ti-steel Clad Plates
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摘要: 针对船体结构对铝-钢复合板的选材与节点设计需求,对铝-铝-钢与铝-钛-钢复合板开展了轴向拉-压疲劳试验,测试了材料的条件疲劳强度与S-N曲线,对比分析了两种铝-钢复合板的疲劳断裂行为与断裂位置。结果表明,在应力比为-1,轴向拉-压载荷条件下,铝-铝-钢复合板的条件疲劳强度为28.8 MPa,铝-钛-钢复合板的条件疲劳强度为55.0 MPa。在疲劳寿命接近的条件下,后者比前者能够承受更大的应力,抵抗疲劳扩展能力更强。铝-铝-钢复合板疲劳断裂主要发生于1060纯铝层,铝-钛-钢复合板疲劳断裂发生于3003铝合金层,疲劳断裂位置与铝-钢接头组成材料的抗拉强度大小密切相关。Abstract: The axial tensile-compression fatigue tests are carried out on Al-Al-steel and Al-Ti-steel clad plates, aiming at the material selection and node design requirements of Al-steel transition joints for hull structures. The fatigue limit and S-N curve of the material are tested, and the fatigue fracture behavior and fracture position of the two Al-steel transition joints compared and analyzed. The results show that the fatigue limit of the Al-Al-steel clad plate is 28.8 MPa and that of the Al-Ti-steel clad plate is 55.0 MPa under the condition of the stress ratio of -1 and the axial tension-compression load. Under the condition of similar fatigue life, the latter can withstand greater stress than the former, and the resistance to fatigue expansion is stronger. The fatigue fracture of the Al-Al-steel clad plate mainly occurs in the 1060 pure aluminum layer, and the fatigue fracture of the Al-Ti-steel clad plate occurs in the 3003 aluminum alloy layer. The fatigue fracture position is closely related to the tensile strength of the Al-steel joint material.
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Key words:
- Al-steel clad plate /
- fatigue limit /
- S-N curve /
- tensile strength
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