Analysis of the impression creep test method using a rectangular indenter for determining the creep properties in welds

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Abstract

The results of a theoretical and finite element investigation of an impression creep test method using a long rectangular indenter under plane strain conditions, rather than the conventional cylindrical indenter, are presented. The application of the technique for determining the creep properties of the various zones within welds is considered. The finite element method is used to obtain accurate (creep) or approximate (elasto-plastic limit load) reference stress solutions for the rectangular indenters placed at several positions in the base material, heat affected zone and weld metal. The effect of varying the geometric test parameters is reported. The possible advantages of the technique for determining some of the important creep properties in welded structures are identified.

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    Citation Excerpt :

    Impression creep specimen with small size can be easily scooped from small components [6]. In order to ensure the accuracy of the creep test, the strength and creep resistance of the indenter material must be 1 to 2 orders of magnitude higher than material to be tested [7]. For nickel-based alloys, which are commonly used at high temperature conditions, no available material can be as indenter.

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