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Abstract
A set of fully coupled thermoelasticity equations is derived, based on the dual-hyperbolic two-temperature (Chen and Beraun, 2001) and hot-electron blast (Falkovsky and Mishchenko, 1999) models, to investigate the deformation of metals subjected to ultrashort-pulsed laser heating. Two potential damage mechanisms, thermal (melting) and nonthermal (high stress damage), are identified. The latter is primarily caused from the hot-electron blast force when the lasers are so intense that the induced electron temperature is on the order of the Fermi temperature. The former is the dominating damage mechanism when the laser power is relatively low. It is also found that for a relatively long gold rod, nonthermal damage could occur in the region near the irradiated end. On the other hand, for a very short gold rod, the nonthermal damage could initiate either near the irradiated end or the other boundary, depending upon the magnitudes of the stress in the two regions as well as the tensile and compressive failure strengths.
