Cylindrical fatigue specimens had circumferential V-notches with a range of elastic stress concentration factors (kt=1.97 4.07).
The fatigue growth of a circumferential external surface flaw in a thick-walled round pipe subjected to rotary bending is simulated numerically.
The fatigue cracks initiated at a circumferential location in the tube commensurate with high tensile bending stress and the stiffest region of the crown (highest stress concentration).
Low cycle fatigue tests were carried out using circumferential notched specimens.
Comparison with the results obtained for a similar piping component with a circumferential butt weld allowed the determination of an experimental fatigue strength reduction factor.
The two elbows with axial notch at crown location have shown less fatigue life compared to that of one elbow with circumferential notch at extrados and one elbow with circumferential notch at intrados.
Such stratified temperature fluid profiles give rise to circumferential metal temperature gradients through the pipe leading to high stresses causing fatigue damage.
The axial propagating wave of the n=2 circumferential mode in a pipe can cause large vibration when the wave cuts on and may cause fatigue damage or transmit structure-borne noise along the pipe.
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.
Previous studies have suggested clinical factors such as the circumferential extent of the tumor, carcinoembryonic antigen (CEA) level, distance from the anal verge [ 4], temporal pattern of fatigue during CRT [ 5] and treatment interval between radiation and surgical resection [ 6] to correlate significantly with clinical response.
