| Abstract [eng] |
This research presents the comparison the results obtained by the analytical, the finite element and the experimental methods, while studying the size of crack opening and its contour curve in case of cyclic symmetrical loading of a specimen depending on the cycle number and loading level. The experiment employs a grade 45 steel specimen with a working part of rectangular cross-section, and with the central crack. The analytical method has been applied for calculations using the equations proposed by Irvin and Makhutov, and the programmable systems COSMOSWorks and ANSYS have been used for FEM. In addition, the influence of the specimen geometry on the crack opening has been taken into consideration. The results demonstrate quite adequate coincidence between the results of experimental and finite element methods, while the analytical calculations are accurate only at the crack tip. |
