I've got an elastomer, NinjaFlex, that I have been tensile testing.
I 3D printed the tensile test specimens. I made some specimens with 100% fill and no voids and some specimens with an 80% infill (with intentional voids). When I put a side crack in both specimens, the 80% infill specimens failed later than the 100% fill specimens.
I was hoping anyone could point me in the right direction of some theory which may explain why this is happening? My initial thoughts are the crack growth dissipates into the voids for the 80% whereas the 100% has no stopping mechanism and continues straight through the specimen.