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Träfflista för sökning "L773:1946 3979 OR L773:1946 3987 srt2:(2019)"

Sökning: L773:1946 3979 OR L773:1946 3987 > (2019)

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1.
  • Molker, Henrik, 1979, et al. (författare)
  • Industrial framework for identification and verification of hot-spots in automotive composite structures
  • 2019
  • Ingår i: SAE International Journal of Materials and Manufacturing. - : SAE International. - 1946-3987 .- 1946-3979. ; 12:2, s. 17-120
  • Tidskriftsartikel (refereegranskat)abstract
    • In this article, a framework for efficient strength analysis of large and complex automotive composite structures is presented. This article focuses on processes and methods that are compliant with common practice in the automotive industry. The proposed framework uses efficient shell models for identification of hot spots, automated remodelling and analysis of found hot spots with high-fidelity models and finally an automated way of post-processing the detailed models. The process is developed to allow verification of a large number of load cases in large models and still consider all potential failure modes. The process is focused on laminated composite primary structures. This article highlights the challenges and tools for setting up this framework.
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2.
  • Öberg, Christian, et al. (författare)
  • Monotonic and Cyclic Creep of Cast Materials for Exhaust Manifolds
  • 2019
  • Ingår i: SAE International Journal of Materials & Manufacturing. - : SAE INT. - 1946-3979 .- 1946-3987. ; 12:2, s. 149-162
  • Tidskriftsartikel (refereegranskat)abstract
    • Cast materials are creep tested between 600 and 900 degrees C using three methods: (i) tensile testing at different strain rates, (ii) stress relaxation during thermal cycling and (iii) traditional creep tests at constant load. Comparisons are made between fast and slow methods and between monotonic and cyclic deformation modes. The tested materials, SiMo51, SiMo1000, Ni-resist D5S and HK30, are used for exhaust manifolds in heavy-duty diesel engines. The fast and cheap methods, (i) and (ii), were used on all materials, while the tedious and costly method, (iii), was used on SiMo51 only. The creep rates from monotonic tensile tests and stress relaxations during thermal cycling agree well. There is no difference between monotonic and cyclic creep rates, and cyclic rates are practically unchanged with the number of thermal cycles. No or small differences in creep rates are observed when comparing tension and compression, although three of the materials include large graphite nodules. At 700 degrees C, a Norton plot for SiMo51 shows coinciding results for tensile test and compressive stress relaxations, whereas the minimum creep rates from constant load tests fall one order of magnitude lower, but with the same slope. For all materials, the Norton creep parameters are evaluated with accurate reproduction of the experimental data. For HK30, two sets of parameters are needed because of deformation hardening.
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