This paper considers the mechanical problem of a semi-infinite piezoelectric medium under sudden thermal load. The medium contains an electrically conducting crack perpendicular to its surface. The transient stresses and electric fields in an uncracked medium are calculated first. Then, these stresses and electric fields are used as the crack surface traction and electric field loads with opposite signs to formulate the mixed boundary value problem. Numerical results for the stress and electric field intensity factors are calculated as a function of normalized time and crack size. Crack propagation behavior is discussed. The parameters that control the transient thermal stress and electric fields are also identified. The maximum thermal shock strength that the material can sustain without catastrophic failure is established according to two distinct criteria: (i) maximum local tensile stress equals the tensile strength of the medium, and (ii) maximum stress intensity factor for the preexisting representative crack equals the fracture toughness of the medium. The results show that the influence of the piezoelectric effects on the thermal stress intensity factor is insignificant.
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October 2004
Research Papers
Thermal Shock Strength of a Semi-infinite Piezoelectric Medium
Bao-Lin Wang,
Bao-Lin Wang
School of Aerospace, Mechanical and Mechatronic Engineering J11, The University of Sydney, Sydney, NSW 2006, Australia
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Yu-Guo Sun
Yu-Guo Sun
School of Aerospace, Mechanical and Mechatronic Engineering J11, The University of Sydney, Sydney, NSW 2006, Australia
Search for other works by this author on:
Bao-Lin Wang
School of Aerospace, Mechanical and Mechatronic Engineering J11, The University of Sydney, Sydney, NSW 2006, Australia
Yu-Guo Sun
School of Aerospace, Mechanical and Mechatronic Engineering J11, The University of Sydney, Sydney, NSW 2006, Australia
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division October 7, 2003; revision received February 21, 2004. Associate Editor: A. M. Sastry.
J. Eng. Mater. Technol. Oct 2004, 126(4): 450-456 (7 pages)
Published Online: November 9, 2004
Article history
Received:
October 7, 2003
Revised:
February 21, 2004
Online:
November 9, 2004
Citation
Wang , B., and Sun, Y. (November 9, 2004). "Thermal Shock Strength of a Semi-infinite Piezoelectric Medium ." ASME. J. Eng. Mater. Technol. October 2004; 126(4): 450–456. https://doi.org/10.1115/1.1789964
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