I have posted a report that updates our work on fracture of notched rods in torsion.  This paper describes additional experiments and computational simulations of the problem.  The paper is given as a hyperlinked PDF with links to animations, images and data to allow further exploration of the results.  Link to paper:  Mode III Fracture in Rods Under Torsion: Experiments and Simulations

Fracture surface reconstructed from segmentation of micro-CT scan of notched PMMA rod fracture in pure torsion loading.  Rod diameter is 19 mm.