Crack damage factor expressed by Normalized Cockcroft & Latham (N C&L) criterion was used for estimating the crack damage accumulation during multiple passes equal-channel angular pressing (ECAP) of 6061Al rod. First the simulation of crack damage factor was carried out by a software DEFORM-3D, and then the ECAP experiments of 6061 rod were performed. The damage places were found locating at the upper and bottom surface of the rod after ECAP. It has also been demonstrated that the ECAP routes including route A, Bc and C have strong effects on the strain distribution and the strain accumulation from both the experiment and the simulation.
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