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On The Use Of Critical Distance Theories For The Prediction Of The High Cycle Fatigue Limit Stress In Notched Ti–6al–4v ☆, David Lanning, Theodore Nicholas, George Haritos
On The Use Of Critical Distance Theories For The Prediction Of The High Cycle Fatigue Limit Stress In Notched Ti–6al–4v ☆, David Lanning, Theodore Nicholas, George Haritos
Dr. George K. Haritos
Methods are investigated for predicting the high cycle fatigue (HCF) lives of notched cylindrical Ti–6Al–4V specimens using critical distance concepts that employ the stress distribution in the vicinity of the notch. Cylindrical fatigue specimens had circumferential V-notches with a range of elastic stress concentration factors (kt=1.97–4.07). Notched and unnotched specimens were cycled to failure using a step-loading technique to generate points on a Haigh (Goodman) diagram for a constant fatigue life of 106 cycles. Finite element solutions were generated to provide stress distributions for the notched gage sections. The stress distributions were used in the search for a critical distance …