Damage and failure mechanisms associated with photoablation of biological tissues
- Poulter Laboratory, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025 (United States)
- Lawrence Livermore National Laboratory, 7000 East Avenue, P.O. Box 808, Livermore, California 94551 (United States)
This paper aims to examine the processes associated with failure of the cornea and other collagenous tissues during photoablation. Two different constitutive models are applied to simulate a series of laser deposition experiments into porcine reticular dermis (1), a biological tissue similar to the cornea in composition and photoablation characteristics. The first of our constitutive models, DFRACT, is a physically motivated, micromechanical model based on the nucleation and growth of spherical voids (2). The second is a relatively simple model that allows the material to vaporize and thermally soften. The simulation results reproduce the prominent features observed experimentally thereby shedding a new light on the operative mechanisms during photoablation. The good qualitative agreement between the simulated stress histories and the stress histories measured during the experiments also demonstrates the effectiveness of micromechanical damage and failure modeling as a viable tool for optimizing existing laser surgery procedures and designing new ones. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 561866
- Report Number(s):
- CONF-950846-; ISSN 0094-243X; TRN: 9716M0125
- Journal Information:
- AIP Conference Proceedings, Vol. 370, Issue 1; Conference: American Physical Society biennial conference on shock compression of condensed matter, Seattle, WA (United States), 13-18 Aug 1995; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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