Elasto-Plastic-Creep Constitutive Equation of an Al-Si-Cu High-Pressure Die Casting Alloy for Thermal Stress Analysis

Yuichi Motoyama, Hidetoshi Shiga, Takeshi Sato, Hiroshi Kambe, Makoto Yoshida

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Accurate simulation of residual stress and deformation is necessary to optimize the design and lifetime of casting components. Therefore, the recovery and strain-rate dependence of the stress–strain curve have been incorporated into empirical constitutive equations to improve the thermal stress analysis accuracy. Nevertheless, these equations present several difficulties related to the determination of material constants and their physical bases. This study suggested an empirical elasto-plastic-creep constitutive equation incorporating these phenomena. To determine the material parameters used in this constitutive equation, this study investigated tensile test methods to obtain stress–strain curves that most closely resemble those during or immediately after casting for the Al-Si-Cu high-pressure die-casting alloy JIS ADC 12 (A383.0), which exhibits natural aging. Results show that solution heat treatment with subsequent cooling to the test temperature should be applied to obtain stress–strain curves used for the thermal stress analysis of high-pressure die casting process of this alloy. The yield stresses obtained using the conventional heating method were 50-64 pct higher than those of the method described above. Therefore, the conventional method is expected to overestimate the overestimation of the predicted residual stress in die castings. Evaluation of the developed equation revealed that it can represent alloy recovery and strain-rate dependence.

    Original languageEnglish
    Pages (from-to)5598-5608
    Number of pages11
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    Volume47
    Issue number11
    DOIs
    Publication statusPublished - 2016 Nov 1

    Fingerprint

    Die casting
    stress analysis
    constitutive equations
    thermal stresses
    Constitutive equations
    Stress analysis
    Thermal stress
    Creep
    plastics
    Plastics
    Strain rate
    Residual stresses
    Casting
    Die castings
    strain rate
    residual stress
    Recovery
    curves
    recovery
    Yield stress

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys

    Cite this

    Elasto-Plastic-Creep Constitutive Equation of an Al-Si-Cu High-Pressure Die Casting Alloy for Thermal Stress Analysis. / Motoyama, Yuichi; Shiga, Hidetoshi; Sato, Takeshi; Kambe, Hiroshi; Yoshida, Makoto.

    In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 47, No. 11, 01.11.2016, p. 5598-5608.

    Research output: Contribution to journalArticle

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