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Open AccessArticle

Correlation Factor Study of Small Punch Creep Test and Its Life Prediction

by Cheng Wen 1, Tong Xu 2 and Kaishu Guan 1,*
School of Mechanical and Power Engineering, East China University of Science and Technology, No. 130 Meilong Street, Xuhui District, Shanghai 200030, China
China Special Equipment Inspection & Research Institute, Building 2, Hepingjie, Xiyuan, Chaoyang District, Beijing 100029, China
Author to whom correspondence should be addressed.
Academic Editor: Robert Lancaster
Materials 2016, 9(10), 796;
Received: 8 August 2016 / Revised: 16 September 2016 / Accepted: 19 September 2016 / Published: 24 September 2016
(This article belongs to the Special Issue Selected Papers from SSTT2016)
A small punch test is one of the innovative methods that can be used to evaluate the properties of a material without destructive harm to the in-service component. Conventionally identifying material properties by a uniaxial test is widely applied to engineering. How the properties obtained from a small punch test can be applied with the same utility has been a goal. In 2006, European Code of Practice (CoP) of small punch tests was first released, in which the correlation factor, ksp, was introduced to bridge the gap between the above methods. The author investigates the relationship between a uniaxial creep text and a small punch creep test by exploring the correlation factor ksp. Various sets of experiments and a comparative study of the conventional uniaxial creep test and small punch creep test were carried out. Methods including Norton, Larson-Miller and Time versus Stress relation were employed to identify the value of ksp. Different ksp values were found in different materials, which indicate that ksp values of materials need to be identified separately. In addition, the life prediction of a small punch creep test was carried out and the results of the life prediction predict a reasonable accuracy, which indicates that the small punch creep test is a reliable method for life prediction. View Full-Text
Keywords: small punch creep test; uniaxial creep test; correlation factor; life prediction small punch creep test; uniaxial creep test; correlation factor; life prediction
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Wen, C.; Xu, T.; Guan, K. Correlation Factor Study of Small Punch Creep Test and Its Life Prediction. Materials 2016, 9, 796.

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