Efficient pseudo-inverse approach for damage prediction in cold forging process simulation

Abstract

This article presents an efficient pseudo-inverse approach for the damage prediction in cold forging process simulation. Pseudo-inverse approach combines the advantages of the fast inverse approach and accurate incremental approaches. Some intermediate configurations are created geometrically and corrected mechanically to well describe the deformation path. The formulation of an axi-symmetrical element based on pseudo-inverse approach is presented. A strain-based damage model is introduced in the flow theory of plasticity. A direct scalar integration algorithm of plasticity-damage is developed, leading to a fast and robust algorithm for large strain increments. The cold forging processes of two axi-symmetrical parts are simulated to validate pseudo-inverse approach by the incremental approach ABAQUS/Explicit. Pseudo-inverse approach gives very good results, but uses much less CPU time.

Inverse problems of damage mechanics for a hub of a friction pair

“…Despite the extremely small sizes of such irregularities, they affect the different service properties of tribo-conjugation (Bhushan, 1998; Carbone and Bottiglione, 2011; Czifra and Horvath, 2011; Thomas, 1982). In the contemporary stage of engineering, optimal design of friction pair details providing increase of efficiency of friction pair elements is a of great value (Gadzhiev and Mirsalimov, 2004; Halouani et al., 2014; Mirsalimov, 2006a, 2006b, 2008, 2009a, 2009b, Mirsalimov et al., 2013; Meng et al., 2014; Sayyad and Kumar, 2012; Shang et al., 2013). The solution of a mechanics problem on definition of such a function of displacements of external contour points of a hub at which the stress field formed by it would decelerate the crack growth in the hub is of considerable interest.…”