Optical methods applied to the investigation of fracture mechanics

Alexis Lagarde; Mario Cottron

doi:10.1117/12.195502

30 November 1994 Optical methods applied to the investigation of fracture mechanics

Alexis Lagarde, Mario Cottron

Proceedings Volume 2342, Interferometry '94: Photomechanics; (1994) https://doi.org/10.1117/12.195502
Event: International Conference on Interferometry '94, 1994, Warsaw, Poland

Abstract

Because of the increase of catastrophic crack propagations at the middle of this century, it became necessary to develop a fracture theory in order to extend the life of structures and for evident reasons of security. These first search works have given a better understanding of the fracture in a linear medium by defining the stress distribution around a crack-tip. The stress singularity is then characterized for each fracture mode by a factor independent of the mechanical properties of the material, the stress intensity factor. This linear theory is always useful because of the common employment of brittle materials. A few decades after, the progress in the study of non-linear behaviors has induced a theory of ductile fracture. For this kind of material, the singularity amplitude is then characterized by the energy release rate. These theoretical works have required the development of experimental methods to test some results to understand special fracture phenomena. Among the experimental methods, the optical ones, which allow non-contact and so non-disturbing measurements, are every powerful. The advent of the laser, the use of image processing and numerical procedure to analyze the experimental data allows by optical methods the determination of stresses or kinematic values with a high precision. Our purpose is to present a few optical methods and the associated analysis techniques developed in our laboratory which seem to be well adapted to measure characteristic parameters of brittle or ductile fracture.

Citation Download Citation

Alexis Lagarde and Mario Cottron "Optical methods applied to the investigation of fracture mechanics", Proc. SPIE 2342, Interferometry '94: Photomechanics, (30 November 1994); https://doi.org/10.1117/12.195502

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