An empirical-mathematical model for predicting and optimizing mechanical properties of cold roll bonded Al1050/SUS304 bilayer sheets

Metallic bilayers have been recently utilized to achieve a wide range of mechanical, physical, and thermal properties. Al/SUS bilayer sheets have found increasing applications in the automotive and food industries due to their enhanced corrosion and wear resistance and low weight. The experiment was first designed considering three parameters at three levels using the Box-Benken design of the experiment method. The mechanical properties such as yield strength, ultimate strength, and elongation were determined by the tensile test. Then, the response parameters were optimized. The variables were modeled by the response surface method. Based on the results, in the RSM, the thickness of the Al layer had the highest impact on the yield strength and ultimate strength. Optimizing three response parameters, these parameters reached their highest values for t_Al=2mm, t_sus=1.5mm, and r=61% which resulted in the yield strength, ultimate strength, and elongation values of 227 MPa, 534 MPa, and 26.9%, respectively.