Experimental and Numerical Fracture Toughness Evaluation of Spiral Seam Weld of API X65 Steel

Ali Farrahi; Seyed Hojjat Hashemi

doi:10.62676/2d4bh946

Authors

Ali Farrahi K.N.Toosi University of Technology Author
S.H. Hashemi Birjand University Author

DOI:

https://doi.org/10.62676/2d4bh946

Keywords:

Fracture toughness, API X65 steel, Spiral seam weld, SENT, GTN Model

Abstract

In this research fracture toughness of spiral seam weld of API X65 is measured through the ASTM E1820 standard recommendations. According to thin-wall pipe of API X65 in this research, specimen sizes could not satisfy the plain strain condition of ASTM E399 therefore, indirect method is accomplished by evaluating the crack tip opening displacement. According to the nature of welding procedure and inhomogeneous probable defects in the different regions of seam weld, δ-R curve with multi-specimen technique of single-edge notched bend (SENB) specimens is applied for test procedure in this research. The measured CTOD and K_1C are 0.23 mm and 265 MPam^3/2respectively. Furthermore, Three-dimensional finite element method numerical evaluation of crack propagation with GTN model has been performed. Good agreement with the other researches was observed for CTOD and fracture toughness of tested material. The difference was about 10 percent.

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