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Fracture toughness of partially welded joints of SUS316 stainless steel at 4 K by large bend-bar tests

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9 Author(s)
Nishimura, A. ; Nat. Inst. for Fusion Sci., Gifu, Japan ; Tobler, R.L. ; Tamura, H. ; Imagawa, S.
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SUS 316 stainless steel bars were partially welded and tested in 3-point bending to evaluate the effect of natural cracks on fusion zone toughness at 4 K. The specimens had a cross-section 87.5 mm×175 mm and were fractured in liquid helium using a 10 MN cryogenic mechanical testing machine. In two tests, unstable fracture occurred at maximum load and at critical stress intensity factors Kmax=227 and 228 MPa√m. Results indicate a high resistance to fracture initiation but no stable tearing. Therefore, no resistance to crack propagation may exist in a fusion zone at a weld root under cryogenic temperature

Published in:

Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 4 )

Date of Publication:

Jul 1996

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