Hello everyone, I am currently doing my masters research project on fracture mechanics. My problem is such that I have a flat circular disc(brittle) which is simply supported around its circumference. The top surface of the disc is subjected to a point load at its centre. the bottom surface has a crack of a given length and a depth of less that half the thickness of the plate ( part through crack). This crack passes through the centre of the plate. What kind of forces will the crack experience? and how can I calculate the stress intensity factor at any point on this crack. There has been a lot of work previously carried out for plates with remote tensile and bending loads on the edges of the plate. I am not sure which category my problem falls into because I am applying a local force at the centre. thanks in advance. Any help will be deeply appreciated.