Creep Analysis of an Isotropic Rotating Al—SiC p Composite Disc taking into Account the Phase-specific Thermal Residual Stress

Abstract

Analysis of steady-state creep in a rotating disc made of Al—SiC_p composite has been carried out using isotropic Hoffman yield criterion and the results obtained are compared with those using von Mises yield criterion ignoring difference in yield stresses. The material parameters characterizing difference in yield stresses have been used from experimental results of other studies. The stress and strain rate distributions developed due to rotation have been calculated and compared for both the criteria. It is observed that the stress distribution is not too much affected due to presence of phase specific thermal residual stress. The presence of residual stress has contributed to an increase in the tangential strain rate particularly in the region near the outer radius of the disc, as compared to the tangential strain rate in the disc without residual stress. The radial strain rate, which is compressive, changes significantly due to the presence of residual stress and even becomes tensile in the middle of the disc. It is thus concluded that the presence of residual stress significantly affects the creep in an isotropic rotating disc.

Keywords

residual stress creep rotating disc composites.

References

Arsenault, R.J. and Taya, M. (1987). Thermal Residual Stress in Metal Matrix Composites, Acta Metallurgica, 35: 651.

Anne, G. , Hecht-Mijic, S. , Richter, H. , Van der Biest, O. and Vleugels, J. ( 2006). Strength and Residual Stresses of Functionally Graded Al2O3/ZrO2 Discs Prepared by Electophoretic Deposition, Scripta Materialia, 54: 2053-2056.

Carrera, E. , Rodriguez, A. , Talamantes, J. , Valtierra, S. and Colas, R. ( 2007). Measurement of Residual Stresses in Cast Aluminium Engine Blocks, Journal of Materials Processing and Technology, 189: 206-207.

Sayman, O. ( 2002). Elastic-plastic and Residual Stresses in Symmetric Thermoplastic Laminated Plates Under a Linear Thermal Loading, Composites Science and Technology, 62(9): 1231-1238.

Sayman, O. ( 2006). Stress Analysis of a Thermoplastic Composite Disc Under Uniform Temperature Distribution, Journal of Thermoplastic Composite Materials, 19: 61-77.

Singh, S.B. and Ray, S. ( 2002). Newly Proposed Yield Criterion for Residual Stress and Steady State Creep in an Anisotropic Composite Rotating Disc, Journal of Materials Processing Technology, 143-144: 623-628.

Dieter, G.E. ( 1988). Mechanical Metallurgy, SI Metric edn, McGraw-Hill Book Co. Ltd, London, UK.

Hoffman, O. ( 1967). The Brittle Strength of Orthotropic Materials, Composites Materials, 1: 200-206.

Sherby, O.D. , Klundt, R.H. and Miller, A.K. (1977). Flow Stress, Subgrain Size and Subgrain Stability at Elevated Temperature, Metallurgical Transactions, 8A: 843-850.

10.

Badini, C. ( 1990). SiC Whiskers-Aluminium 6061 Composite: Microstructure and Mechanical Characteristic Anisotropy, Journal of Materials Science, 25: 2607-2614.

11.

Shi, N. , Wilner, B. and Arsenault, R.J. (1992). An FEM Study of the Plastic Deformation Process of Whisker Reinforced SiC/Al Composites, Acta Metallurgica et Materialia, 40: 2841-2854.