Effect of corrosion on the mechanical behaviour of aircraft aluminum alloys
Effect of corrosion on the mechanical behaviour of aircraft aluminum alloys
复制标题
腐蚀对飞机铝合金力学行为的影响
DOI：
10.1533/9781845695538.1.67
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发表时间：
2009
影响因子：
8.3
通讯作者：
A. Kermanidis
中科院分区：
文献类型：
--
作者：
S. Pantelakis;A. Kermanidis
摘要：简要概述了飞机铝合金，沿着讨论了它们对腐蚀的敏感性和各种类型的腐蚀损伤。静态和疲劳载荷条件下的机械性能的腐蚀的影响的意义被证明。为此，有关预腐蚀铝试样的拉伸和疲劳行为的实验结果。结果得到了金相观察的支持，并从材料腐蚀损伤和腐蚀诱发氢脆的协同作用方面进行了讨论。还研究了预腐蚀铝合金的疲劳裂纹扩展和断裂行为。实验结果表明，预先腐蚀暴露对材料的损伤容限性能的本质影响。腐蚀是一个时间依赖性和扩散控制的过程，在局部范围内降低材料的性能。为了描述预腐蚀铝合金的断裂行为，引入了局部断裂韧性的概念。提出了一个评估局部断裂韧性的力学模型，并将其纳入了不规则载荷下预腐蚀材料疲劳寿命评估的疲劳裂纹扩展程序中。
Abstract: A brief overview of aircraft aluminum alloys, along with a discussion of their susceptibility to corrosion and the various types of corrosion damage is provided. The significance of the effect of corrosion on mechanical behaviour under static and fatigue loading conditions is demonstrated. For this purpose, experimental results concerning the tensile and fatigue behaviour of pre-corroded aluminum specimens are presented. The results, which are supported by metallographic observations, are discussed in terms of the synergetic effect of corrosion damage and corrosion-induced hydrogen embrittlement of the material. The fatigue crack growth and fracture behaviour of pre-corroded aluminum alloys is also examined. Experimental results demonstrate the essential influence of prior corrosion exposure on the material’s damage tolerance performance. Corrosion, being a time-dependent and diffusion-controlled process degrades the material properties in a local scale. To describe the fracture behaviour of pre-corroded aluminum alloys, the concept of local fracture toughness is introduced. A mechanical model for assessing the local fracture toughness is presented and incorporated into a fatigue crack growth code for fatigue life assessment of pre-corroded material under irregular loading.