Modeling of ablation by photospallation using the computer program PUFF/DFRACT

Tarabay H. Antoun; Lynn Seaman; Michael E. Glinsky

doi:10.1117/12.209909

22 May 1995 Modeling of ablation by photospallation using the computer program PUFF/DFRACT

Tarabay H. Antoun, Lynn Seaman, Michael E. Glinsky

Proceedings Volume 2391, Laser-Tissue Interaction VI; (1995) https://doi.org/10.1117/12.209909
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

In general, macroscopic material failure is a manifestation of irreversible changes at the microscopic level. Many tissues, which may appear to be macroscopically homogeneous, are, at a fundamental microscopic level, a composite material. For example, cornea is composed of a hyaluronic acid matrix in which layers of collagen fibers are overlaid in a crossing pattern. The points where the collagen fibers intersect are potential nucleation sites for microscopic defects, which under the action of tensile stress, nucleate, grow and coalesce to form macroscopic failure planes, or spall planes. Using a model based on microstructural evolution, this paper examines the failure process during photoablation. Specifically, the paper describes a physically motivated, micromechanical model based on the nucleation and growth of spherical voids. This model is then used to simulate photoablation of cornea. Potential for using this model to predict the stress wave and material damage measured by experiment is discussed.

Citation Download Citation

Tarabay H. Antoun, Lynn Seaman, and Michael E. Glinsky "Modeling of ablation by photospallation using the computer program PUFF/DFRACT", Proc. SPIE 2391, Laser-Tissue Interaction VI, (22 May 1995); https://doi.org/10.1117/12.209909

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