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Modeling creep and fatigue of copper alloys

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Abstract

This article reviews expressions to quantify the thermal creep and fatigue lifetime for four copper alloys: Cu-Ag-P, Cu-Cr-Zr, Cu-Ni-Be, and Cu-Al2O3. These property models are needed to simulate the mechanical behavior of structures with copper components, which are subjected to high heat-flux and fatigue loading conditions, such as molds for the continuous casting of steel and the first wall in a fusion reactor. Then, measurements of four-point bending fatigue tests were conducted on two-layered specimens of copper alloy and stainless steel, and thermal ratchetting behavior was observed at 250 °C. The test specimens were modeled with a two-dimensional elastic-plastic-creep finite-element model using the ABAQUS software. To match the measurements, a primary thermal-creep law was developed for Cu-0.28 pct Al2O3 for stress levels up to 500 MPa and strain rates from 10−8 to 10−2 s−1. Specifically, \(\dot \varepsilon \)(s−1)=1.43×1010 exp (−197,000/8.31 T(K)) (σ(MPa))2.5 (t(s))−0.9.

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Author notes

  1. G. Li (Graduate Student, Lead Engineer)

    Present address: Department of Nuclear Engineering, University of Illinois, USA

Authors and Affiliations

  1. Heat Transfer and Fluid Systems Design, AEPD, General Electric Aircraft Engines, 45215-6301, Cincinnati, OH

    G. Li (Graduate Student, Lead Engineer)

  2. Department of Mechanical and Industrial Engineering, the University of Illinois at Urbana-Champaign, 61801, Urbana, IL

    B. G. Thomas (Professor)

  3. Department of Nuclear, Plasma and Radiological Engineering, the University of Illinois at Urbana-Champaign, 61801, Urbana, IL

    J. F. Stubbins (Professor and Head)

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  1. G. Li
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  3. J. F. Stubbins
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Li, G., Thomas, B.G. & Stubbins, J.F. Modeling creep and fatigue of copper alloys. Metall Mater Trans A 31, 2491–2502 (2000). https://doi.org/10.1007/s11661-000-0194-z

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  • DOI: https://doi.org/10.1007/s11661-000-0194-z

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