【摘要】 根据幂硬化四点弯曲缺口试样应力场的有限元计算结果,测定了15MnVN钢焊接热影响区的解理断裂应力。结果表明,在硬化指数和载荷比都较小时,由幂硬化有限元解得到的解理断的应力σ_fp与由线性硬化有限元解得到的解理断裂应力σ_fl接近,随硬化指数和载荷比的加大,σ_fp与σ_fl的差别逐渐增大到不可忽略的地步。更多还原

【Abstract】 Based on the results of a FEM analysis of pure bending notched specimen for power hardening material, the cleavage fracture stress of 15MnVN stcel welded heat affected zone was measured. A comparison was made between σ_fp, the cleavage fracture stress obtained according to power hardening FEM analysis and σ_fl, the cleavage fracture stress obtained according to linear hardening FEM analysis. It has been showed that σ_fp, is close to σ_fl when both hardening exponent and applied load are small, the difference between σ_fpandσ_flbecomes innegligible when the hardening exponent is large and when the applied load approaches general yield load.更多还原