Abstract
MLCF tests were performed on CP-Ti under load-controlled mode. Both axial and torsional strain responses show three softening stages. CP-Ti shows a significant asymmetric strain response with obvious ratcheting phenomena under symmetric multiaxial stress loading. The critical plane of CP-Ti under load-controlled mode is more closely aligned with the maximum principal stress plane proved by OM observation. Based on this, a new KBMSS-P stress parameters model is proposed to overcome the variability of strain plane under stress loading. It can be further combined with strain parameters KBM-P model by use of the Heaviside function to accommodate different control modes.
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