Relaxation of Residual Stresses in a Surface-Hardened Prismatic Specimen with a Stress Concentrator of a Semicircular Profile under Conditions of High-Temperature Creep
Author details
- Samara State Technical University, Samara, Russian Federation
- Samara State Technical University, Samara, Russian Federation
- Syzran Branch of Samara State Technical University, Syzran, Russian Federation
Abstract
The study presents a numerical method for analyzing the relaxation kinetics of residual stresses in a prismatic sample with semi-circular notches after prior vibro-impact ultrasonic sur- face plastic hardening by shot peening under high-temperature creep conditions, based on the finite element method. The method includes the stage of reconstructing (recovering) residual stresses in a smooth hardened specimen based on known experimental information, solving problems of stress redistribution after notch application, and calculating the kinetics of residual stresses under creep conditions. To illustrate the method, problems are solved for a prismatic sample of 100×10×10 mm with notch radii of 0.1 to 0.5 mm from EP742 alloy at a temperature of 650°C under thermal exposure for 300 hours. The compliance of the calculated data using the developed method with experimental data and grid method calculations was verified in the spe- cial case of a smooth specimen. The kinetics of residual stress distribution due to creep from the depth of the notch root into the sample at different time intervals over 300 hours was analyzed. Based on the calculation data, it was shown that the highest relaxation rate is observed in stress concentrators with ρ = 0.1 mm and ρ = 0.2 mm, but in all cases, after 300 hours of creep, com- pressive residual stresses are maintained in the area adjacent to the notch as well as away from the concentrator. It is shown that the notches practically do not affect the geometry of the sam- ples compared to the hardened smooth samples, while a reduction in the deflection of the hard- ened samples is observed during the creep process.
Keywords
РЕЛАКСАЦИЯ ОСТАТОЧНЫХ НАПРЯЖЕНИЙ В ПОВЕРХНОСТНО-УПРОЧНЕННОМ ПРИЗМАТИЧЕСКОМ ОБРАЗЦЕ С КОНЦЕНТРАТОРОМ НАПРЯЖЕНИЙ ПОЛУКРУГЛОГО ПРОФИЛЯ В УСЛОВИЯХ ВЫСОКОТЕМПЕРАТУРНОЙ ПОЛЗУЧЕСТИ
Разработан численный метод анализа кинетики процесса релаксации остаточных напряже- ний в призматическом образце с надрезами полукруглого профиля после опережающего вибро- ударного ультразвукового поверхностнопластического упрочнения дробью в условиях высоко- температурной ползучести, базирующийся на методе конечных элементов. Метод включает этап реконструкции (восстановления) остаточных напряжений в гладком упрочненном образце по известной экспериментальной информации, решения задач о перераспределении напряжений после нанесения надреза и расчета кинетики остаточных напряжений в условиях ползучести. В качестве иллюстрации метода решены задачи для призматического образца 100×10×10 мм с радиусами надрезов 0,1×0,5 мм из сплава ЭП742 при температуре 650°С в условиях темпера- турной выдержки длительностью 300 ч. Выполнена проверка соответствия данных расчета по разработанному методу экспериментальным данным и данным расчета методом сеток в частном случае для гладкого образца. Проанализирована кинетика распределения остаточных напряже- ний вследствие ползучести по глубине от дна концентратора вглубь образца в различные мо- менты времени на интервале 300 ч. На основании данных расчетов показано, что наибольшая скорость релаксации наблюдается в концентраторах напряжений при ρ = 0,1 и 0,2 мм, но во всех случаях после ползучести в течение 300 ч сохраняются сжимающие остаточные напряжения как в области, прилегающей к надрезу, так и вдали от концентратора. Показано, что надрезы прак- тически не оказывают влияния на изменение геометрии образцов, по сравнению с упрочненными гладкими образцами, при этом наблюдается уменьшение величины прогиба упрочненных образ- цов в процессе ползучести.
Ключевые слова
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Article information
- Published
- 25 November 2024
- Issue date
- 25 November 2024
- Issue
- No. 4 (2024)