The fracture properties such as mode I and mode II fracture toughness and the critical strain energy release rate for different concrete-concrete jointed interfaces are experimentally determined using Digital Image Correlation technique. Interface beam specimens having different compressive strength materials…
The fracture properties such as mode I and mode II fracture toughness and the critical strain energy release rate for different concrete-concrete jointed interfaces are experimentally determined using Digital Image Correlation technique. Interface beam specimens having different compressive strength materials on either side of a centrally placed vertical interface are prepared and tested under three-point bending in a closed loop servo-controlled testing machine under crack mouth opening displacement control. Digital images are cap- tured before loading (undeformed state) and at different instances of loading. These images are correlated and the surface displacements are computed from which the surface strains, crack opening displacements, load- point displacement, crack length and crack tip location are computed. It is seen that the CMOD and vertical load-point displacement computed using DIC analysis matches well with those measured experimentally. It is shown that the digital image correlation technique can be very useful for determination of fracture parameters.