Recently a theoretical frame and an experimental procedure to average the heat energy dissipated in a volume surrounding the tip a fatigue crack, Q*, was proposed by the authors. Such a technique is based on temperature maps measured by means of an infrared camera. The aim of this paper is the size definition of the structural volume for fatigue life assessment of cracked and severely notched specimens made of AISI 304L stainless steel. In view of this, the averaged heat energy at the crack tip was equaled to that measured in smooth specimens for the same characteristic fatigue life. The averaged heat energy Q* was subsequently adopted to analyse the fatigue behavior of cracked as well as severely notched specimens.
THE HEAT ENERGY DISSIPATED IN A CONTROL VOLUME TO CORRELATE THE FATIGUE STRENGTH OF SEVERELY NOTCHED AND CRACKED STAINLESS STEEL SPECIMENS
MENEGHETTI, GIOVANNI;RICOTTA, MAURO;RIGON, DANIELE
2017
Abstract
Recently a theoretical frame and an experimental procedure to average the heat energy dissipated in a volume surrounding the tip a fatigue crack, Q*, was proposed by the authors. Such a technique is based on temperature maps measured by means of an infrared camera. The aim of this paper is the size definition of the structural volume for fatigue life assessment of cracked and severely notched specimens made of AISI 304L stainless steel. In view of this, the averaged heat energy at the crack tip was equaled to that measured in smooth specimens for the same characteristic fatigue life. The averaged heat energy Q* was subsequently adopted to analyse the fatigue behavior of cracked as well as severely notched specimens.
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