<論文>光干渉法によるき裂先端近傍の微小面外変位計測

概要

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Infinitesimal out-of-plane displacements around the crack tip are evaluated by the optical interferometer. Twyman-Green interferometer is applied to a frozen-stress model of Araldite B, and the validity of the optical interferometric technique to the engineering fracture problems is confirmed. Subsequently, variations of out-of-plane displacement at the vicinity of crack tip of Plexiglas plate with increasing load is determined by Fizeau interferometer. As the results, interference fringe patterns around the crack tip are clearly obtained, and the maximum out-of-plane dis-placement in this studying condition is measured as about 5μm. This experimentally determined value is small in comparison with the theoretical value which can be calculated through the two-dimensional theory with the plane-stress assumption. This phenomenon explains that there is the three-dimensional stress near the crack tip.
鈴鹿工業高等専門学校の論文
2003-01-31