Study of crack propagation in stress concentrator zones under thermal pulse loading in parts with casting defects

Olga Shypul, Vitalii Myntiuk, Denys Tkachenko, Oleksiy Pavlenko, Dmytro Brega, Yevgen Tsegelnyk

Abstract


The subject of the study is the processes of crack formation under the action of thermal pulse loads on the example of a body part of an aviation unit. The aim of the work is to determine the influence of existing stress concentrators in parts obtained by the casting method on the possibility of their processing by the thermal pulse method. The main tasks of the study include establishing the regularities of crack development depending on the geometric concentrators of parts and imposing restrictions on the modes of thermal pulse processing. The methods of the study include methods of mathematical modeling of the problem of thermoelasticity during thermal pulse loading and modeling of brittle fracture in the zone of the highest stress concentration with the determination of stress intensity coefficients for the case of normal separation, transverse and longitudinal displacements and the J-integral. Verification of the calculation models is based on the criterion of calculation coincidence and determination of the optimal size of finite elements of the calculation areas on test problems. As a result of the study, the dependences of crack opening on the sizes of geometric stress concentrators were determined, taking into account the presence of pores in the metal structure of the casting part. The conclusions provide recommendations for the use of the obtained regularities. Further research should be focused on improving the method for assigning modes of thermal pulse processing of parts from the point of view of the crack resistance of the part structure.

Keywords


crack resistance; thermoelasticity; thermal pulse processing; stress intensity factor; J-integral; pores

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DOI: https://doi.org/10.32620/aktt.2025.2.06