A finite deformation elasto-plastic cyclic constitutive model for ratchetting of metallic materials. (October 2016)

• Record Type: Journal Article
• Authors: Zhu, Yilin; Poh, Leong Hien
• Is Part Of: International journal of mechanical sciences. Volume 117(2016)
• Page Start: 265
• Page End: 274
• Publication Date: 2016-10
• Subjects: Logarithmic stress rate -- Ratchetting -- Cyclic constitutive model -- Kinematic hardening rule -- Finite deformation; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2016.08.018
• Languages: English
• ISSNs: 0020-7403

Abstract

Abstract: A finite deformation elasto-plastic cyclic constitutive model is developed for the ratchetting behavior of metallic materials. Compared to existing models, an improved description is achieved by introducing a modified "A-F" kinematic rule and a nonlinear isotropic hardening rule proposed by Chaboche. In the proposed kinematic hardening rule, the back stress is decomposed into two parts, with each addressing an "A-F" evolution rule consisting of a linear hardening and a dynamic recovery term – as done by Armstrong and Frederick. The dynamic recovery coefficients are postulated here to decrease with deformation, instead of being constants as per standard A-F rule. In addition, a ratchetting coefficient is introduced into each dynamic recovery term to better describe the ratchetting behavior. The predictive capability of the proposed model is demonstrated by benchmarking its results against experimental data for monotonic stress-strain responses, cyclic hardening and ratchetting behavior of metallic materials. Highlights: A finite elasto-plastic constitutive model is developed with a new kinematic hardening rule. The proposed rule introduces considerably less material parameters than many existing rules. Easy calibration of material parameters for the proposed rule. The proposed model describes the monotonic and cyclic deformations of metallic materials reasonably well.