Experimental characterization, material modeling, identification and finite element simulation of the thermo-mechanical behavior of a zinc die-casting alloy. (February 2018)

• Record Type: Journal Article
• Authors: Martinez Page, Maria Angeles; Hartmann, Stefan
• Is Part Of: International journal of plasticity. Volume 101(2018:Feb.)
• Page Start: 74
• Page End: 105
• Publication Date: 2018-02
• Subjects: Thermo-viscoplasticity -- Zinc die-casting alloy -- Stress algorithm -- Thermomechanical experiments; Plasticity -- Periodicals; Plasticité -- Périodiques; Plasticity; Periodicals; 620.11233
• DOI: 10.1016/j.ijplas.2017.10.010
• Languages: English
• ISSNs: 0749-6419

Abstract

Abstract: Many industrially manufactured parts consist of a zinc die-cast material. Since classical constitutive models cannot predict the thermo-mechanical structural behavior of such a material – which exhibits highly non-linear rate-dependent effects, distinct aging properties as well a size-dependence of thin-walled parts –, it is necessary to carry out mechanical experiments under varying conditions as a basis for constitutive modeling. In this article, one major goal is the investigation of the rate-dependence at different temperatures of a zinc die-casting alloy. On the basis of several experiments on thin-walled, cylindrical tubes of Zamak 5, a thermo-mechanically consistent thermo-viscoplasticity model without a yield surface is proposed. Moreover, a concept of material parameter identification is provided and the implementation of the model into a finite element program is shown. Finally, the applicability of the model is proven by comparing an experiment of a complex component part with finite element simulations. Highlights: Extensive thermo-mechanical experiments of zinc die-casting material under torsion, tension and compression. Provision of temperature-dependent thermal parameters. Development of a thermo-mechanically consistent constitutive model. Development of a new stress algorithm without local iterations. Validation of the simulation using a specimen with very complex geometry.