SOME ASPECTS OF INFLUENCE EXERTED BY LARGE-SCALE EFFECT NATURE AT CYCLIC TESTS ON OPERATION AND RELIABILITY OF ALUMINUM ALLOY PRODUCTS

E. Chernyshov, A. Romanov, V. V. Mylnikov
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引用次数: 8

Abstract

The article describes a study into the large-scale effect and properties of surface layers of solids in case of the Al–Mg system (AMg2) aluminum alloy. It demonstrates the dependence of surface layer properties on the absolute sizes of bodies. The conclusions obtained can be extended to studying the influence of different shapes of solids on their surface and linear bulk properties. New technology development and technological advance constantly toughen metal consumption requirements of engineering devices thus making it rather difficult to avoid fatigue striations and cracks forming in critical parts. In certain cases they may form at the earliest stages of operation, i.e. parts run with cracks most of their life cycle. Therefore, comprehensive assessment of their performance and life requires reliable data on the evolution of cyclic strength and durability parameters, and maximum information on the process of damage accumulation at all stages of fatigue loading: stages of crack origin and development leading to structural failure. Therefore, the need to improve the methods of fatigue testing and failure pattern detection is one of the most relevant problems of technical advance. It is established that the difference in deformation at a surface leads to changes in work-hardenability that involves changes in surface damageability and strength performance of samples. An approach to the large-scale effect as a phenomenon is considered from the perspective of the difference in surface layer plastic deformation for samples of different absolute sizes.
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循环试验中大规模效应性质对铝合金产品运行和可靠性的影响
本文研究了Al-Mg系(AMg2)铝合金表面固体层的大规模效应和性能。它证明了表面层性质对物体绝对尺寸的依赖性。所得结论可推广到研究不同形状固体对其表面和线性体积性能的影响。新技术的发展和技术的进步不断提高了工程装置对金属的消耗要求,使得在关键部件上很难避免疲劳条纹和裂纹的形成。在某些情况下,裂纹可能在操作的最初阶段形成,即零件在其生命周期的大部分时间里都带着裂纹运行。因此,对其性能和寿命的综合评估需要可靠的循环强度和耐久性参数演变数据,以及在疲劳加载的各个阶段(裂纹产生和发展导致结构破坏的阶段)损伤积累过程的最大信息。因此,需要改进疲劳试验和失效模式检测方法是技术进步中最相关的问题之一。研究表明,表面变形的差异会导致加工淬透性的变化,而加工淬透性的变化涉及到试样的表面损伤性和强度性能的变化。从不同绝对尺寸试样的表面层塑性变形差异的角度考虑了大尺度效应作为一种现象的途径。
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