Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)
- Volume 20 Issue 11
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- Pages.3424-3432
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- 1996
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- 1226-4873(pISSN)
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- 2288-5226(eISSN)
DOI QR Code
Development of Modified Creep-Fatigue Damage Model for High Temperature Life Prediction
고온 수명평가를 위한 수정 크립-피로 손상모델의 걔발
- Park, Jong-Joo ;
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Seok, Chang-Sung
(Dept.of Mechanical Engineering, Sungkyunkwan University) ;
- Kim, Young-Jin (Dept.of Mechanical Engineering, Sungkyunkwan University)
- Published : 1996.11.01
Abstract
For mechanical system operating at high temperature, damage due to the interaction effect of creep and fatigue plays an important role. The objective of this paper is to develop a modified creep-fatigue damage model which separately analyzes the pure creep damage for hold time and the creep-fatigue interaction damage during startup and shutdown period. The creep damage was calculated by the general creep damage equation and the creep-fatigue interaction damage was calculated by the modified equation which is based on the frequency modified strain range method with strain rate term. In order to verify the proposed model, a service of high temperature low cycle fatigue tests were performed. The test specimens were made from inconel-718 superalloy and the test parameters were wave shape and hold time. A good agreement between the predicted lives based on the proposed model and experimentally obtained ones was observed.
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