Physical model) material stress-strain relationship. In order to carry out the elastoplastic analysis of the disc spring, the stress-strain relationship of the disc spring material was determined by a simple tensile test. The elastic modulus of the material is 2103@105MPa, the Poisson's ratio is 013, and the yield strength is about 1500MPa. In order to more accurately simulate the nonlinear characteristics of the material, a piecewise linear material model is used in the calculation to completely simulate the stress-strain of the material. relationship. 2) Plastic model 1. The definition of the plastic model mainly includes the yield criterion, the hardening criterion and the flow rule <3>. The yield criterion defines the limit of the elastic behavior of the material. Considering that the disc spring material is a tough material with better performance, the Mises yield criterion is adopted here, that is, the stress intensity of the structure is the Mises equivalent stress. The hardening criterion defines the yielding condition after plastic deformation. The piecewise linear follow-up hardening model is used in this paper. The relative magnitude of the plastic strain increment tensor component can be determined by the flow law. The law of flow is derived from the plastic potential function. When the strain potential energy function is assumed to be the same as the yield function, the flow law is called the flow law associated with the yield function. This paper uses the flow rule associated with the Mises yield function. 3) Geometric equations. The geometric equation defines the relationship between displacement and strain. Considering that the disc spring structure calculated in this paper is very deformed, a large deformation nonlinear geometric equation is used for this purpose. The finite element mesh model and the boundary conditions consider the entire problem to have axis symmetry in structure and load, so the analysis uses an axisymmetric model. All units are quadrilateral axisymmetric units. What are the boundary conditions? The axial displacement of the point is fixed by the constraint, and the axial time-varying displacement of the point. It can be seen that in the first loading and unloading cycle, the loading curve and the unloading curve are quite different. This result indicates that the plasticity of the disc spring material is significant in the first loading and unloading cycle, and the disc spring structure exhibits a strong material nonlinearity. After the first flattening, the difference between the subsequent loading and unloading curves is small, and it can be considered that the plastic influence of the material has been eliminated, and the structure enters the stable/steady state, and the overall performance is nonlinear elasticity. The nonlinearity here is mainly caused by the large deformation of the structure and belongs to geometric nonlinearity. Since the structure has a strong geometric nonlinearity, it is not possible to directly obtain the unloading curve before unflattening. To this end, a load-unload calculation of a plurality of different axial displacement loads is performed on the disc spring, and the loading and unloading curve of the obtained single-chip disc spring is as shown. The loading-unloading sequence is (0-013-0-018-0-113-0-118-0-213-0-218-0-31228-0) mm. The stress distribution and deformation of the disc spring when the first compression to the working position 8 gives the distribution of the Mises equivalent stress, the radial normal stress, the axial normal stress and the circumferential normal stress of the disc spring when first compressed to the working position, respectively. The dotted line indicates the contour of the disc spring before it is deformed (the same below). Cylindrical Roller Bearing ,Cylindrical Roller Thrust Bearing,Cylinder Roller Bearing,Double Row Cylindrical Roller Bearing NINGBO DEMY (D&M) BEARINGS CO.,LTD , https://www.demybmtbearing.com
Analysis of the shaping unit of the disc-shaped elastic member for the disconnection of the flight device frame
Physical model) material stress-strain relationship. In order to carry out the elastoplastic analysis of the disc spring, the stress-strain relationship of the disc spring material was determined by a simple tensile test. The elastic modulus of the material is 2103@105MPa, the Poisson's ratio is 013, and the yield strength is about 1500MPa. In order to more accurately simulate the nonlinear characteristics of the material, the calculation uses