EXPERIMENTAL GH SINGULARITY FIELD AROUND GROWING CRACK TIP

The displacement fields ux,uy of growing crack tip for LY12-M material specimens with double edge cracks are measured using Moire method. The experimental singularity fields are compared with GH theoretical field. The size and shape of the experimental GH singularity fields are obtained. The di screpancy of experiment and theory is within ±10%. The experiments show thatthere is (InA/r)α+1 singularity dominant around growing crack tip. The shape of thisregion of dominant singularity are batterfly wing, then ...