Abstract
Dissipated energy ahead of the crack tip represents a useful tool to study the fatigue crack growth. In this regard, different analytical and numerical models were proposed in literature to investigate the role of dissipated energy in fracture mechanics and experimental techniques were used to validate them. The experimental measurement of dissipated energy requires an accurate equipment and suitable techniques that may restrict the applications only to laboratory tests.In this work, an experimental approach by using the thermographic technique has been used to assess the heat dissipated at the crack tip in the cyclic plastic zone. The proposed approach is based on the evaluation of the heat source that occurs at the twice of the loading frequency directly related to the plastic phenomena around the crack tip. This index showed to be more suitable for on field measurement. By monitoring the fatigue crack growth during a fracture mechanics test carried out on the martensitic steel AISI 422, a similar Paris Law model was obtained between the crack growth and the heat dissipated per cycle. Moreover, it was obtained a fourth power dependence of heat dissipated energy and Stress Intensity Factor (SIF) in agreement with numerical and analytical models present in literature.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.