Observation of Stress Field Around an Oscillating Crack Tip in a Quenched Thin Glass Plate

Abstract

The variation of stress field around an oscillating crack tip in a quenched thin glass plate is observed using instantaneous phase-stepping photoelasticity. The successive images around the propagating crack are recorded by a CCD camera that is equipped with a pixelated microretarder array. Then, the phase maps of the principal stress difference and the principal direction are easily obtained even though the photoelastic fringes cannot be visualized. The path of the crack growth as well as the stress intensity factors and the crack tip constraint are obtained from these phase distributions. Results show that the mode I stress intensity factor and the crack tip constraint vary remarkably with the crack growth. In addition, the results show that the mode-II stress intensity factor exists even though the crack propagates smoothly.

Experimental–numerical hybrid stress analysis for a curving crack in a thin glass plate under thermal load

“…When the specimen is quenched, the crack starts to propagate at almost the same speed as the descending speed, as described in a Ref. [23].…”

“…Then, the variation of the crack tip stress fields during the crack propagation has been evaluated [22][23][24]. In these studies, the crack growth behavior was discussed by evaluating the stress intensity factors and the T-stress experimentally and theoretically.…”

A Novel Experimental Approach for Calculating Stress Intensity Factors from Isochromatic Data

“…Since then, this approach has been extensively used by many different authors to report stress intensity factor results for a multiplicity of fracture mechanics problems [7][8][9]. Moreover, the method has been successfully extended to other experimental techniques [10][11][12][13][14] as a standard and straightforward methodology for calculating fracture parameters.…”

Prediction of crack paths in a quenched glass plate by using peridynamic theory

“…Furthermore, the lengths of the confined lateral cracks were smaller than those in the middle of the plate. Recently, Yoneyama et al (2008) also revisited the oscillatory behavior of a crack growth in a quenched thin glass plate by employing the technique of instantaneous phase-stepping photoelasticity. They extracted the time-variations of the stress intensity factors, K I and K II , as well as the crack tip constraint, T -stress by analyzing the principal stress difference.…”