Determination of Fracture Toughness of High-grade Pipeline Steel Based on Though-thickness-notched Specimen by Small Punch Test

doi:10.3901/JME.2022.12.083

Abstract

Abstract: As a miniature specimen testing technology, small punch test (SPT) has a broad development potential in evaluating the performance deterioration of equipment and materials in petrochemical industry. A method for evaluating fracture toughness of materials by SPT through notches is proposed. Taking X80 high-grade pipeline steel as the target material, the small punch test is carried out to evaluate the fracture toughness of materials. First of all, a through type prefabricated notch specimen is designed and the small punch test is carried out. Secondly, the finite element simulation of the through type prefabricated notch specimen is performed while the model was modified with the test data. And the optimal size of the notched specimen was determined. Finally the J-integral of each contour is obtained by contour integral method and the critical fracture toughness J_C(SP) of small punch test is determined by the crack initiation displacement. Meanwhile, the J_C value of material is obtained by standard SENB three-point bending test. Finally, the relationship between J_C and J_C(SP) of the high-grade pipeline steel was established by using the proposed method with the notched SPT specimen.

Key words: small punch test, fracture toughness, through-thickness notch, J-integral, X80 pipeline steel

CLC Number:

TG115

SONG Ming, ZU Yizhen, MA Shuai, WANG Bingying, CAO Yuguang, JIANG Wenchun. Determination of Fracture Toughness of High-grade Pipeline Steel Based on Though-thickness-notched Specimen by Small Punch Test[J]. Journal of Mechanical Engineering, 2022, 58(12): 83-92.

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