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A fem study of the overlapping ratio effect on superplastic formation of metal matrix composites

Tehrani, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. In aerospace applications structures weight is considered as a major performance parameter. One of the most effective manufacturing methods for weight reduction is superplastic forming. By this technique, not only the weight, but also the stress concentration, the cost, and the manufacturing time are noticeably reduced. Additionally, the components with complicated shapes could be formed in a single manufacturing step. Due to the wide demand for whiskers reinforced metal matrix composites (MMCs) in aerospace industries, many research works have been designed to extend the borders of superplastic forming to MMCs materials. In the present study, a 3-D symmetric micromechanical finite element model is developed to predict the superplastic behavior ofAl/SiCw composite. Here, the effects of fibers Overlapping Ratio (OR) on the superplastic forming process are highlighted. In most of the available numerical studies this phenomenon has been ignored. Here, the Internal Stress Superplasticity (ISS) mechanism is considered.This mechanism involves a thermal cycling load (e.g. 100o-450°-100°c, with 50s heating and 150s cooling period) accompanied by a constant biasing mechanical load (e.g. 2, 4, 7, 10 MPa). The effects of different overlapping ratios (i.e. 0.25 < OR < 1) on plastic strain response of the MMC are investigated. According to the results, the total plastic strain, which is accumulated during 40 thermal cycles, increases in the range of overlapping ratio of0.5
  5. Keywords:
  6. 3-D Symmetric model ; Finite element method (FEM) ; Metal matrix composites (MMCs) ; Overlapping ratio (OR) ; Metal matrix composites ; Micromechanical finite element model ; Overlapping ratio ; Performance parameters ; Reinforced metal matrix composites ; Superplastic forming ; Superplastic forming process ; Symmetric model ; Aerodynamics ; Aerospace applications ; Aerospace industry ; Finite element method ; Manufacture ; Mechanisms ; Plastic deformation ; Stress concentration ; Superplasticity ; Thermal cycling ; Metallic matrix composites
  7. Source: 27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010, 19 September 2010 through 24 September 2010, Nice ; Volume 3 , 2010 , Pages 1836-1843 ; 9781617820496 (ISBN)
  8. URL: http://www.icas.org/ICAS_ARCHIVE/ICAS2010/PAPERS/642.PDF