Residual stresses in preform of stress applying part for Panda type optical fiber with considering of technological imperfections of doping

Investigated the influence of the real doping profile of preform of stress applying part for anisotropic optical fiber Panda on distribution of residual stress field. Boundary value problem of transient heat conduction is solved and found the temperature distribution, then was solved the boundary quasi-static problem of residual stress in the preform of stress applying part. Compared the results obtained in the axisymmetric formulation with a perfectly circular cross-sectional shape with the results of the plane problem, which takes into account the real shape of doped area. Revealed that the irregularity of doping leads to the asymmetry and the local concentration of residual stress fields in the cross section, which may be the cause of the destruction of preform. There are significant changes in the values that are considered important in the study of strength. The difference between the lowest and highest values of maximum principal shear stresses at the boundary between the doped silica and pure silica glasses increased with growing of deviation from the circular cross-section.