Modeling the Mechanical Behavior of Aluminum Laminated Metal Composites DuringHigh Temperature Deformation

摘要

A constitutive model for deformation of a novel laminated metal composite (LMC)which is comprised of 21 alternating layers of Al 5182 alloy and Al 6090/SiC/25p metal matrix composite (MMC) has been proposed. The LMC as well as the constituent or neat structures have been deformed in uniaxial tension within a broad range of strain rates (i.e. 10(exp-6) to 10/s) and moderate to high homologous temperatures (i.e. 0.3 >= 0.95 Tm ). The LMC structure exhibits a behavior somewhat closer to the MMC layers. The results of these experiments have lead to a thorough characterization of the neat layer's mechanical behavior and a subsequent semi-empirical constitutive rate equation for both the Al 5182 and Al 6O9O/SiC/25p. These predictive relations for the neat layers have been coupled with a proposed model for deformation. This deformation model has led to the development of a constitutive relationship between flow stress and applied strain rate for the laminated structure which has been compared with experimental data.