This paper presents numerical ductile tearing simulation results of four complex cracked pipes made of two materials, performed at Battelle, Columbus, OH. In ductile tearing simulation, stress-modified fracture strain model is used, which is determined from tensile test results and fracture toughness test data. Overall good agreement is found in comparing simulation results with experimental load, crack length, and crack mouth opening displacements versus load-line displacement (LLD) data. The effect of the complex crack on J–resistance curves is discussed.
A B S T R A C T In this paper, numerical ductile tearing simulation results are compared with six circumferential through-wall and surface cracked pipes made of two materials (SA-333 Gr. 6 and A106 Gr. B carbon steels), performed at Battelle. For simulation, a model using a simplified fracture strain model is employed, by analysing tensile data of the material. By comparing experimental J-R data with FE simulation results, the damage model dependent on the element size is determined based on the ductility exhaustion concept. The model is used to simulate ductile tearing behaviour of six circumferential through-wall and surface cracked pipes. In all cases, simulated results agree well with experimental load, crack length and crack mouth opening displacement versus load line displacement data.Keywords circumferential cracked pipe test simulation; finite element damage analysis; stress-modified fracture strain.
N O M E N C L A T U R EA, B, C = material constants in multi-axial fracture strain locus, see Eq. 4 a o = initial crack length Δa = crack growth t = pipe thickness r m = mean radius of pipe θ = half circumferential crack angle ε f = (stress-modified) multi-axial fracture strain ε e p , Δε e p = equivalent plastic strain and increment σ e , σ m = effective stress and mean normal stress, respectively σ 1 , σ 2 , σ 3 = principal stress components L e = element size ω, Δω = accumulated and incremental damage, respectively ω c = critical damage for cracking J R = J-resistance A B B R E V I A T I O N CMOD = crack mouth opening displacement C(T) = compact tension FE = finite element LLD = load-line displacement SC = surface cracked TWC = through-wall cracked
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