Explicit algorithms have been applied to study quasi-static large deformation contact problems with the use of some non-physical acceleration methods for the improvement of computation efficiency. Numerical errors caused by those non-physical acceleration methods are studied in this paper. It is found that oscillation will be introduced if one uses dynamic approach to study a quasi-static problem. Numerical errors caused by dynamic approach will be increased when non-physical acceleration techniques, such as Speed-Up-Loading and Mass-Scaling, are applied.

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