Steel and Composite Structures

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Research on residual stress in SiCf reinforced titanium matrix composites

  • Qu, Haitao (Beijing Aeronautical Manufacturing Technology Research Institute) ;
  • Hou, Hongliang (Beijing Aeronautical Manufacturing Technology Research Institute) ;
  • Zhao, Bing (Beijing Aeronautical Manufacturing Technology Research Institute) ;
  • Lin, Song (Shijiazhuang Tiedao University)
  • Received : 2014.02.21
  • Accepted : 2014.06.24
  • Published : 2014.08.25
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Abstract

This study aimed to theoretical calculate the thermal residual stress in continuous SiC fiber reinforced titanium matrix composites. The analytical solution of residual stress field distribution was obtained by using coaxial cylinder model, and the numerical solution was obtained by using finite element model (FEM). Both of the above models were compared and the thermal residual stress was analyzed in the axial, hoop, radial direction. The results indicated that both the two models were feasible to theoretical calculate the thermal residual stress in continuous SiC fiber reinforced titanium matrix composites, because the deviations between the theoretical calculation results and the test results were less than 8%. In the titanium matrix composites, along with the increment of the SiC fiber volume fraction, the longitudinal property was improved, while the equivalent residual stress was not significantly changed, keeping the intensity around 600 MPa. There was a pronounced reduction of the radial residual stress in the titanium matrix composites when there was carbon coating on the surface of the SiC fiber, because carbon coating could effectively reduce the coefficient of thermal expansion mismatch between the fiber and the titanium matrix, meanwhile, the consumption of carbon coating could protect SiC fibers effectively, so as to ensure the high-performance of the composites. The support of design and optimization of composites was provided though theoretical calculation and analysis of residual stress.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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