Determining uniaxial and multiaxial creep data using the small pin loaded one-bar specimen (OBS) and notched bar specimen (SNS4) Balhassn S. M. Ali*, PhD, MSc, B.Eng E-mail: [email protected]* E-mail: [email protected] Department of Mechanical & Industrial Engineering ABSTRACT Bursa Orhangazi University, Bursa, Turkey This paper presents a novel Nun-destructive small specimen creep testing methods, which are used to obtain creep properties for high temperature components. The specimens design, testing technique and the data conversion procedures are described in this paper. The pin loaded small one-bar specimen (OBS) and notched bar specimen (SNS4) are designed determine the remaining life time for the critical high temperature components operating at creep range. These include components in chemical plants, power generation plants, aero-engines and oil refineries. The small OBS is suitable for use in obtaining both uniaxial creep strain and creep rupture life data whereas the SNS4 is designed to obtain the multiaxial behaviour of the material using small material samples. The conversion relationships between the OBS applied load and the corresponding uniaxial stress, and between the OBS measured load-line deformations and the corresponding uniaxial creep strain and strain rate have been described in this paper. The advantages of these novel testing techniques over other small specimens creep testing techniques are highlighted, recommendations for future research are also given in this paper. Keywords: Small One-bar specimen; small notched specimen; creep test; Conversion factors; Conversion relationship, reference stress method, FE analyses; Specimen Design; nun-destructive creep testing. * Corresponding author Telefax: +90 (224) 4448268 / Ext. 1159 1