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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 …
Notch Size Effects In Hcf Behavior Of Ti–6al–4v, George Haritos, Theodore Nicholas, David Lanning
Notch Size Effects In Hcf Behavior Of Ti–6al–4v, George Haritos, Theodore Nicholas, David Lanning
Dr. George K. Haritos
The high cycle fatigue (HCF) behavior of Ti–6Al–4V is investigated for cylindrical specimens having three sizes of geometrically similar circumferential V-notches, each with an elastic stress concentration factor, Kt, of approximately 2.78. A step loading technique for obtaining a point on a constant life (106 cycles) Haigh diagram from a single test specimen was implemented. Tests were performed at stress ratios of R=0.1, 0.5, and 0.8 for specimens machined from two different product forms of Ti–6Al–4V, bar and plate forgings. Results indicate that while there is a definite notch size effect in the Ti–6Al–4V bar within …