The simulation model of the diaphragm spring establishes a diaphragm spring as shown in Fig. 2, which has 16 separation fingers, so that its stress deformation and deformation characteristics are periodic every 22.5Â°. Due to the limitations of ANSYS software and the current level of computer hardware, a diaphragm spring 1/4 model was selected for analysis.
The 3D solid model made in the UGNX2.0 environment was cut into 1/4, and the 1/4 solid model was imported from ANSYS 10.0. In the ANSYS solid modeling environment, the A circle and the B circle are added, and the position is as shown in 3. These two circles allow constraints and loads to be applied to the cell boundaries and to the exact location. Limit the number of meshes to each side of the diaphragm spring. The principle is to make the mesh as uniform as possible.
Due to the existence of stress concentration, the unit near the diaphragm spring window should be refined; and for the far-end finger end, because of the distance from the analysis area, their units can be larger to simplify the model, so as not to reduce the calculation accuracy. At the same time, the calculation time is shortened.
In the literature <1>, the axisymmetric unit, the plate and shell element and the three-dimensional solid element are applied for analysis, and the simulation results of the solid element are most ideal. According to this conclusion and the computer experiment environment used, the 8-node solid element (Solid185) is used for mesh division.
The calculation results are solved by the large static deformation method and the FullNewton-Raphson method for the finite element mesh shown in 3. The following results can be obtained. Stress-Deformation Curve This is a relatively simple curve. In the post-processing results, the stress-deformation curve at any point on the diaphragm spring can be directly obtained. 4 is the stress-deformation curve at points I to IV on the diaphragm spring.
Load characteristic curve The load characteristic curve of the diaphragm spring, that is, the displacement curve of the B-circumference force-B circumference Y direction in 3b. The joint force of the B circle refers to the sum of the reaction forces of all the nodes on it. 5 is the load characteristic curve of the diaphragm spring. In the whole process of diaphragm spring stress change, ANSYS uses the stepwise incremental method to calculate the geometric nonlinear finite element method of the clutch diaphragm spring, and records the superposition process. Therefore, it can also simulate the stress change process of the entire deformation of the diaphragm spring.
6 is the stress change that divides the entire displacement loading into three processes. The first is the initial stress state of the diaphragm spring, the fourth is the flattened state at the end of the deformation of the diaphragm spring, and the second and third are intermediate processes. The four processes of stress change to the diaphragm spring are evident.
It can be seen from the image that the four-point stress curve obtained by the finite element method and the AL formula calculation method is quite consistent, and thus the feasibility of the finite element method calculation can be determined.
The diaphragm spring characteristic curves obtained by the finite element method, the experimental method, and the AL empirical formula method are compared. The curves obtained by the three methods are quite consistent, and the curve obtained by the finite element method is closer to the experimental curve, so that the reason can be judged: the finite element method performs a normal simulation calculation on the separation finger effect, but not like AL. The formula ignores its effect.
Conclusion 1) Comparison of the results of axisymmetric elements, plate-shell elements and solid elements for meshing of finite elements: 1 Accuracy: solid element > plate-shell element > axis-symmetric element, and due to the large error of the axisymmetric element, This unit is not recommended for finite element analysis of the diaphragm spring. 2 Calculation time under the same machine configuration: plate and shell unit 2) Calculating the diaphragm spring characteristic curve by nonlinear finite element method is not only feasible, but also very close to the curve of the empirical formula AL method and experimental method, and the trend is consistent. The curve obtained by the finite element method is closer to the experimental curve than the AL formula method. The reason is that the finite element method performs a normal simulation calculation on the separation finger effect, but does not ignore its effect like the AL formula method.
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