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The purpose of this paper is to understand the effect of surface roughness of the specimen on obtaining the creep characteristics by using bending creep tests. To this aim, a numerical study has been performed on the creep damage development of the specimen by implementing the different surface roughness into finite element models. The work may shed some light on the influence of different surface roughness on the stress distribution, the net section stress, and the indentation creep stress index were analyzed. Introduction There is a continued trend towards the progressive use of higher temperatures to achieve improved efficiencies in, for example, electric power generation equipment, gas turbines and chemical reactors in the last decades. This trend is resulting in an increased need for more reliable lifetime prediction methods for components subjected to creep loading [1-6]. A typical creep curve can conveniently be divided into three stages: primary creep stage, secondary or steady state creep stage and tertiary creep stage. For the engineering application, the secondary stage has been widely studied for its steady state creep rate merits, which is often possible to express creep strain rate, ) (t ε& , in the form [1]: ) exp( ) ( ) ( RT Q B T A t n n − = = σ σ ε& (1) where, σ is the stress, Q is the activation energy for creep deformation; n is stress exponent, and B is the creep constant. R is the gas constant and T is the absolute temperature. Ref [12] has initially studied the creep deformation and the steady-state deflection rate of the three points bending creep of the specimen is shown as follows:

Effect of Surface Roughness on the Determination of the Creep Properties of Material by Using Three Points Bending Creep Test