Abstract
A performance evaluation model for spindle-toolholder joint system is built by applying the contact finite element method (FEM). Contact detection is implemented at the Gaussian integration points of the contact elements. Contact state is determined by calculating normal distance and normal contact force between every two points on the contact surface. Friction state is determined by calculating tangential contact force. The determinations are introduced into the variable principle of nonlinear FEM based on pure penalty method. The updated FE equations are solved using the full Newton-Raphson method. Deformation and contact stress distribution are studied. The stiffness distribution is derived by calculating the displacement increments under the different forces, based on the stiffness definition. The proposed model can well illustrate and evaluate the joint performance.
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