RESEARCH OF GLASS BEAMS FOR FOUR-POINT BENDING USING THE METHOD OF DIGITAL IMAGE CORRELATION

The main elements of glassstructures commonly used in construction arebending elements. use glass beams with alarge ratio cross-sectional height to width is mostoften encountered practical use. This type ofstructure characterized by the phenomenon lossof stability from plane.Optical research methods are becoming moreand more popular due convenience and lackof direct contact test specimen. Such aresearch method digital imagecorrelation. In general, requiresspecialized hardware for a single experimentwithout need record images at high speed, itis also promising publicly available user'smirrorless camera as recording device.The subject study was beamssubjected four-point bending. Six double-layerglass were manufactured study. Thebeams tested stepwise increase loadon special rig made glassbeams. relative deformations recordedusing correlation imagesand mechanical strain gauges.The paper describes usingmirrorless cameras colour matrix studyglass Themethodology consisted selecting rightequipment determining characteristics ofthe obtain information theimages prepare them analysis. imageswere de-colorized white balance wasadjusted using photo editor. ready foranalysis transferred specialized softwareGOM Correlate Pro.The four-pointbending. values maximum stresses wereobtained equilibrium equation thesection, obtainedaccording readings devices,and images.Failure occurred layerswith initial crack formation lowe mosttensile zone, then propagated tuliplike pattern upper zone.The confirmed disadvantage glassbeams large height-to-width ratio, namely theloss in-plane stability.The image usingpublicly user performed well,often showing destructive close tothe theoretical obtained calculation. It isrecommended this furtherresearch