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Study of fatigue properties of materials through cyclic automated ball indentation and cyclic small punch test methods
Published in Trans Tech Publications Ltd
2017
Volume: 734 KEM
   
Pages: 273 - 284
Abstract
One of the important inputs while estimating the remaining life of critical components is the fatigue property of materials. Fatigue data, in the form of stress vs. cycles to failure (or) strain vs. cycles to failure (or) fatigue crack growth rate data is used to predict the residual life. Material's fatigue property degrades with time and usage; hence, it is appropriate to use the current properties for remaining life assessment. Often the quantity of material available for generating fatigue data is limited, especially, if the material is scooped out of existing component of a power plant. Further, fatigue response being probabilistic in nature, requires multiple specimens to be tested at any given stress/strain levels. This has prompted us to develop test procedures to determine the fatigue data of materials from a limited volume of material. This paper presents the results of cyclic ball indentation test method as well as cyclic small punch test method that is used to generate the fatigue data at different stress levels. There are several fine details relating to these test techniques - viz., establishing a equivalent damage criteria for failure life with standard LCF/HCF test specimens. The influence of one of the variables, viz., friction at the specimen-Tool interface of a small punch test is investigated through numerical simulation and the results are presented here. © 2017 Trans Tech Publications, Switzerland.
About the journal
JournalKey Engineering Materials
PublisherTrans Tech Publications Ltd
ISSN10139826
Open AccessNo
Concepts (13)
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    Fatigue crack propagation
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    Outages
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    Service life
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    Strain
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    BALL INDENTATION
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    BALL INDENTATION TESTS
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    Critical component
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    CURRENT PROPERTIES
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    FATIGUE PROPERTIES
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    Hysteretic energy
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    REMAINING LIFE ASSESSMENTS
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    SMALL PUNCH TEST
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    Fatigue of materials