Abstract
The residual stress distribution for two strategies of asymmetric quenching in Al-Zn-Mg-Cu aluminum alloy plates has been simulated using the finite element method. The results show that for asymmetric quenching between the upper and lower surfaces, the through-thickness asymmetric quenching residual stress distribution lies between the two distributions corre-sponding to the heat transfer coefficients on the upper and lower surfaces respectively. The surface and central stress magnitudes are equal to the average of the stress magnitudes corresponding to the two heat transfer coefficients. For asymmetric quenching of a single surface, the surface stress distribution is the same as the heat transfer coefficient distribution and the stress magnitude is equal to the stress magnitude corresponding to the average value of the heat transfer coefficients at each location. However, the center quench residual stress distribution is approximately uniform and the stress magnitude is equal to the average of the stress magnitudes corresponding to the maximum and minimum heat transfer coefficients.
Highlights
Al-Zn-Mg-Cu aluminum alloys are widely used in the aircraft industry because of their high specific strength, specific stiffness and toughness, good machinability and excellent corrosion resistance [1] [2] [3]
The results show that for asymmetric quenching between the upper and lower surfaces, the through-thickness asymmetric quenching residual stress distribution lies between the two distributions corresponding to the heat transfer coefficients on the upper and lower surfaces respectively
For asymmetric quenching of a single surface, the surface stress distribution is the same as the heat transfer coefficient distribution and the stress magnitude is equal to the stress magnitude corresponding to the average value of the heat transfer coefficients at each location
Summary
Al-Zn-Mg-Cu aluminum alloys are widely used in the aircraft industry because of their high specific strength, specific stiffness and toughness, good machinability and excellent corrosion resistance [1] [2] [3]. For industrial plates with large plate thicknesses, the condition of asymmetric quenching is unavoidable and the distribution of residual stresses during quenching appears asymmetrical. The quench residual stresses of aluminum alloys Al-Zn-Mg-Cu have been studied both by experimental methods and numerical simulations [5]. Two strategies of asymmetric quenching in an Al-Zn-Mg-Cu aluminum alloy plate were simulated using finite element method. The distribution of surface and central residual stresses and the magnitude of the two asymmetric quenching strategies are discussed in detail. A finite element model of residual stress quenching has been verified by neutron diffraction
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