Fracture toughness is the most important reference index in safety assessment, life prediction of nuclear reactor, pressure equipment, and risk assessment of pressure equipment containing defects. Conventional mechanical test specimens require a large amount of materials and cannot be carried out on in-service pressure equipment. The specimen of small punch test (SPT) is much smaller than conventional one, and can be sampled from the surface of pressure equipment. Repair is not acquired after sampling. Many mechanical properties parameters of the material can be determined from the load-displacement curve of test. SPT makes up the deficiencies of conventional mechanical properties test. In this paper, an innovative approach, inverse finite element method (IFEM), is proposed to deal with the load-displacement curve. The procedure of IFEM can be divided into 3 steps. Step 1, a database containing a variety set of material parameters and their corresponding load-displacement curve will be built using FEM. Step 2; a set of matched material parameter of test load-displacement curve will be selected from the database by artificial neutral network (ANN). Step 3, a numerical simulation of fracture toughness test will be performed and fracture toughness Jic will be determined from the result of simulation. Compared with empirical correlation method, IFEM is much more theoretical and needs not to perform a large number of small punch tests and conventional mechanical tests to create a correlation equation between the mechanical property and load-displacement curve. So IFEM is more efficiency and accurate.
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2017 25th International Conference on Nuclear Engineering
July 2–6, 2017
Shanghai, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5779-3
PROCEEDINGS PAPER
Determination of Fracture Toughness From Small Punch Test Using Inverse Finite Element Method for In-Service Equipment Available to Purchase
Kaishu Guan,
Kaishu Guan
East China University of Science and Technology, Shanghai, China
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Tong Xu,
Tong Xu
China Special Equipment Inspection & Research Institute, Beijing, China
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Linling Guo,
Linling Guo
East China University of Science and Technology, Shanghai, China
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Mingxue Fu,
Mingxue Fu
East China University of Science and Technology, Shanghai, China
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Huadong Zhu
Huadong Zhu
State Nuclear Power Engineering Company, Shanghai, China
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Kaishu Guan
East China University of Science and Technology, Shanghai, China
Tong Xu
China Special Equipment Inspection & Research Institute, Beijing, China
Linling Guo
East China University of Science and Technology, Shanghai, China
Mingxue Fu
East China University of Science and Technology, Shanghai, China
Huadong Zhu
State Nuclear Power Engineering Company, Shanghai, China
Paper No:
ICONE25-67406, V001T01A034; 8 pages
Published Online:
October 17, 2017
Citation
Guan, K, Xu, T, Guo, L, Fu, M, & Zhu, H. "Determination of Fracture Toughness From Small Punch Test Using Inverse Finite Element Method for In-Service Equipment." Proceedings of the 2017 25th International Conference on Nuclear Engineering. Shanghai, China. July 2–6, 2017. V001T01A034. ASME. https://doi.org/10.1115/ICONE25-67406
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