The basic assumptions of the slip line method are: the thickness of the sheet flange remains unchanged and is in a plane strain state. The material is isotropic and has no hardening. The influence of friction distribution on plastic flow is not considered... The basics of the slip line method The assumptions are: the thickness of the sheet flange is constant and is in a plane strain state. The material is isotropic and has no hardening. The influence of friction distribution on plastic flow is not considered... The basic assumption of the slip line method is: sheet method The flange thickness remains unchanged and is in a plane strain state. The material is isotropic and has no hardening. The influence of friction distribution on plastic flow is not considered... The basic assumption of the slip line method is: the thickness of the sheet flange remains unchanged, and In a state of plane strain, the material is isotropic and has no hardening. The influence of friction distribution on plastic flow is not considered... The basic assumption of the slip line method is: the thickness of the sheet flange remains unchanged and is in a state of plane strain. The material Isotropic, no hardening, and the influence of friction distribution on plastic flow is not considered... The basic assumption of the slip line method is: the thickness of the sheet flange remains unchanged and is in a plane strain state, the material is isotropic, and there is no hardening , does not consider the influence of friction force distribution on plastic flow... The basic assumptions of the slip line method are: the thickness of the sheet flange remains unchanged and is in a plane strain state, the material is isotropic and has no hardening, and the friction force distribution is not considered Influence on plastic flow... The basic assumptions of the slip line method are: the thickness of the sheet flange remains unchanged and is in a plane strain state. The material is isotropic and has no hardening. The influence of friction distribution on plastic flow is not considered. ..The basic assumptions of the slip line method are: the thickness of the sheet flange remains unchanged and is in a plane strain state, the material is isotropic and has no hardening, and the influence of friction distribution on plastic flow is not considered...