Experimental calibration of the bond-slip relationship of different CFRP-to-timber joints through digital image correlation measurements

Nowadays, the use of Digital Image Correlation (DIC) technique has spread and it is being used in several engineering areas to measure displacements. The available data obtained from DIC measurement evaluate bond performance between a Carbon fibre Reinforced Polymer (CFRP) externally bonded timber substrate scarce. From existing with other materials, this contactless revealed be quite useful but its accuracy well-established techniques, such as electric strain gauges not well understood yet. Therefore, current work aims study 2D measurements within low-cost perspective. To that end, CFRP-to-timber joints were tested under single-lap shear test different bonding techniques considered well. Some flaws intrinsically derived complicate assessment, fluctuations generated displacements field, are identified, bypass problem new methodology proposed. This based on two closed-form solutions that, after defining local global behaviours joints, allowed eliminate found measurements, facilitating estimation comprehension full debonding process which was achieved good proximity homologous gauge measurements.