Author(s): Aleksander T. Bekker; Sergei G. Gomolski; Vladimir A. Takhteev
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Abstract: The boundary conditions on contact of samples with punch plate under the testing can be realized corresponding to the absence of friction, infinite frietion or finite friction. With the aim of analysis if boundary conditions on stress and strain state the cylinder with diameter equal to height was consid· ered. The finite element method was used to find the stresses in the gravity centers of elements under different boundary eonditions. An analysis of stress and strain state showed that the stress distribution under zero friction was considerably differ from the same with friction. Under the finite and infinite friction the dangerous stress and strain state is formed close to points on the bound of loaded sides. The equivalent stresses were determined for this regions according to different strength theories. The stress analysis showed that if the failure was formed under the same stress level than the registered forces at the failure moment were considerably differ leading to large big of strength values for materials.
Year: 1996