Abstract
An axisymmetric thermomechanical damage model is proposed for airfield concrete pavement under very rapid heating and cooling processes due to high-temperature exhaust gas from vectored thrust engines. This is typical of advanced aircraft during their short vertical take-off and landing routines. The temperature and pore pressure distributions are investigated inside the airfield concrete pavement along the radial and vertical directions. In addition, we derive the three-dimensional thermoelastic stress-strain laws accounting for spherical void effects. Since the temperature range in this study is very large, thermal properties of concrete pavement are treated as functions of temperature. The spatial-temporal temperature field of the airfield concrete pavement is calculated numerically by the explicit finite difference method. Subsequently, the pore pressure distribution is predicted based on the ASME Steam Tables and the foregoing temperature distribution. Within the framework of linear thermoelasticity, the stress distributions are computed as functions of locations and time by the finite element method. Further, Newman's crack growth model is applied to estimate the delamination (thermal spalling) time of the airfield concrete pavement at various locations due to the internal pore pressure.
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