Characteristics of Stress Index in Steady State Creep Equation

Mita, Toshihiro; Misumi, Masaaki; Okubo, Masashi

doi:10.1299/jsmemecjo.2004.1.0_433

Cited by 1 publication

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“…Odqvist and J. Hult have reported that a logarithm of the creep coefficient can be linearly plotted as a function of the creep exponent in typical heat resistant steels [4]. The relationship between the creep exponent and a logarithm of the creep coefficient in other materials including non-ferrous metals and ceramics has been investigated by T. Mita et al [5]. As the result, the linear relationship was also observed in the materials, in addition, the gradient and vertical axis intercept on the graph depended on the material.…”

Section: Proposal Of New Parameter For Creep Life Predictionmentioning

confidence: 99%

Creep Life Prediction Method by Using High-Temperature Indentation Creep Test

Ito

Yajima

Arai

2018

The 18th International Conference on Experimental Mechanics

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Abstract:Creep life prediction is very important to maintain safe operation of thermal power plants for a long-term period. In this study, an alternative creep life prediction method was proposed based on a relationship between creep exponent n and creep coefficient k. A high temperature indentation creep test was conducted to identify the creep exponent and creep coefficient for each specimen with different creep damage ratio. Subsequently, the relationship between the creep coefficient and creep exponent for each creep damage ratio was focused on. As a result, it was confirmed that a new parameter introduced based on both creep coefficient and creep exponent linearly increase as the creep damage ratio increases. Furthermore, the is uniquely determined by the creep damage ratio regardless of the temperature and stress conditions. These results indicate that the creep life can be predicted with a high accuracy using the .

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Section: Proposal Of New Parameter For Creep Life Predictionmentioning

confidence: 99%