| Title |
Evaluation of Fracture Strength in Mn-Mo-Ni Low Alloy Steels by FE Analysis on Small Punch Test |
| Authors |
이재봉(Jae Bong Lee); 김민철(Min Chul Kim); 오용준(Yong Jun Oh); 박재학(Jai Hak Park); 이봉상(Bong Sang Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Small punch test; Finite element analysis; Critical fracture stress; Pressure vessel steel; Low alloy steel |
| Abstract |
The critical fracture stresses(σ^*_f (sp)) in various low alloy steels for reactor pressure vessel(RPV) have been evaluated by finite element analysis(FEA) of small punch test in the cleavage temperature region(-150 ∼ -196℃). In order to improve the accuracy of the FEA results on small punch tests, the uniaxial stress-strain properties beyond the necking were optimized by comparing the results of uniaxial tensile test and its finite element analysis. The loaddisplacement curves and distances from center to fracture surface(D_f) of FEA results are in good consistence with the experimental results. The σ^*_f(sp) from small punch test in various reactor pressure vessel(RPV) steels were found to have a linear relationship to the values from the precracked specimens(σ^*_f(PCVN)). This result indicates that small punch tests could be a useful method to evaluate the cleavage fracture behavior of the low alloy steels. |