Moscow Polytechnic University, Moscow, Russia

S. A. Tipalin, Cand. Eng., Prof., Dept. of Metalworking and Additive Technologies (OMD&AT), e-mail: tsa_mami@mail.ru
B. Y. Saprykin, Senior Lecturer, Dept. of OMD&AT, e-mail: saprykin-boris@mail.ru
N. D. Borisov, Postgraduate Student, Dept. of OMD&AT, e-mail: nicbor1998@gmail.com

The calculation of technological parameters and the prediction of the behavior of the workpiece during deformation are directly interrelated with the properties of the material. The use of multilayer steel sheets with a connecting elastic-viscous layer changes the flow of the layers and radically changes the stress gradients in the deformable material. The use of multilayer materials (steel-polymer-steel) reduces noise and vibration in finished products, which makes the use of data very promising. The paper considers a numerical study of the bending of a billet consisting of two 0.5 mm thick sheet layers of 08 steel connected by an elastic-viscous connecting layer. The thickness of the layer is 0.05 mm and its shear properties were determined experimentally. During the numerical simulation, data were obtained on the distribution of radial and tangential stresses in each metal sheet and the degree of material thinning depending on the relative bending radius of the material. The stress and thinning distributions for multilayer and single-layer materials are compared. During the research, it was revealed that the inner layer of the multilayer sheet increases its thickness during bending, and the outer layer is thinned. At the same time, the degree of intensity of the thinning of the outer layer exceeds the thickening of the inner layer by an order of magnitude. The total thinning of two layers of material is one and a half times higher than the thinning of a single-layer material of the same brand with a similar thickness. A comparison of the bending moment of a two-layer and a single-layer sheet of equal thickness showed that the bending moment of a homogeneous material is approximately twice that of a monolithic workpiece. These features must be taken into account when developing the technological process of bending parts made of multilayer materials.

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2. Аntiphon® MPMTM structure-borne sound damping laminate. Avaiulable at: https://antiphon.se/en/products-and-applications/mpm-structure-borne-sound-damping-laminate

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