The specific heat loss per cycle (Q parameter) evaluated experimentally by means of the so-called cooling gradient technique was used in previous works to synthesise 140 experimental fatigue test results generated from plain and bluntly notched specimens made of AISI 304L stainless steel. Since the cooling gradient was measured by means of thermocouple wires attached to the specimen’s surface with a 1.5-to-2 mm glue dot diameter, notches with tip radii greater than 3 mm were used, because the glue dot diameter would have been too large to capture the specific heat loss at the tip of sharper notches. Therefore in this contribution the cooling gradient was measured by means of a FLIR SC7600 infrared camera, equipped with proper lens and a spacer ring to achieve a 20 m/pixel spatial resolution and fully reversed axial fatigue tests were carried out on 4-mm-thick, hot-rolled AISI 304L stainless steel specimens, characterized by 3, 1 and 0.5 mm notch tip radii.. Finally, the new fatigue test results could be successfully included in the existing heat energy -based scatter band previously calibrated.

THE USE OF THE HEAT ENERGY LOSS TO CORRELATE THE FATIGUE STRENGTH OF SEVERELY NOTCHED STAINLESS STEEL SPECIMENS

RIGON, DANIELE;RICOTTA, MAURO;MENEGHETTI, GIOVANNI
2017

Abstract

The specific heat loss per cycle (Q parameter) evaluated experimentally by means of the so-called cooling gradient technique was used in previous works to synthesise 140 experimental fatigue test results generated from plain and bluntly notched specimens made of AISI 304L stainless steel. Since the cooling gradient was measured by means of thermocouple wires attached to the specimen’s surface with a 1.5-to-2 mm glue dot diameter, notches with tip radii greater than 3 mm were used, because the glue dot diameter would have been too large to capture the specific heat loss at the tip of sharper notches. Therefore in this contribution the cooling gradient was measured by means of a FLIR SC7600 infrared camera, equipped with proper lens and a spacer ring to achieve a 20 m/pixel spatial resolution and fully reversed axial fatigue tests were carried out on 4-mm-thick, hot-rolled AISI 304L stainless steel specimens, characterized by 3, 1 and 0.5 mm notch tip radii.. Finally, the new fatigue test results could be successfully included in the existing heat energy -based scatter band previously calibrated.
2017
Proceedings International Symposium on Notch Fracture (ISNF)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3219088
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