The present paper discusses issues related to dynamic deformation and failure of the jet engine case impacted by released blade of rotating rotor.It is shown that due to a local area of deformation of the jet engine c...The present paper discusses issues related to dynamic deformation and failure of the jet engine case impacted by released blade of rotating rotor.It is shown that due to a local area of deformation of the jet engine case impacted by the released blade acceptable failure criterion for the case can be obtained on the base of model tests and corresponding numerical simulations.The equation of motion based on the variation principle of balance of virtual powers of work.The plasticity models of the materials are based on the von Mises yield surface with associated flow rule and isotropic hardening low depends on the strain rate.Numerical solutions of the problem are implemented by the finite element method and explicit scheme of numerical integration in time,realized in the code LOGOS.The uncoupled ductile fracture model is applied with the equivalent plastic strain as failure criterion.Validity of computer simulations is supported by proximity of numerical and experimental data for the depth of cutting of the targets at the impact sides and perforation and perforation time of the targets.Analysis of the principal strains and equivalent plastic strains as well as stress triaxiality parameters during the deformation process up to the failure of the targets is also presented.It is shown that destruction of the plane model of the jet engine case is initiated on the impact side when the equivalent plastic strain normalized by the elongation reaches the levelε_(pl1)^(f)=2.5 with triaxial compression and perforation of the plate takes place ifε_(pl2)^(f)=1.2 on the opposite side of the target plate with biaxial tension.展开更多
文摘The present paper discusses issues related to dynamic deformation and failure of the jet engine case impacted by released blade of rotating rotor.It is shown that due to a local area of deformation of the jet engine case impacted by the released blade acceptable failure criterion for the case can be obtained on the base of model tests and corresponding numerical simulations.The equation of motion based on the variation principle of balance of virtual powers of work.The plasticity models of the materials are based on the von Mises yield surface with associated flow rule and isotropic hardening low depends on the strain rate.Numerical solutions of the problem are implemented by the finite element method and explicit scheme of numerical integration in time,realized in the code LOGOS.The uncoupled ductile fracture model is applied with the equivalent plastic strain as failure criterion.Validity of computer simulations is supported by proximity of numerical and experimental data for the depth of cutting of the targets at the impact sides and perforation and perforation time of the targets.Analysis of the principal strains and equivalent plastic strains as well as stress triaxiality parameters during the deformation process up to the failure of the targets is also presented.It is shown that destruction of the plane model of the jet engine case is initiated on the impact side when the equivalent plastic strain normalized by the elongation reaches the levelε_(pl1)^(f)=2.5 with triaxial compression and perforation of the plate takes place ifε_(pl2)^(f)=1.2 on the opposite side of the target plate with biaxial tension.
