Abstract
The creep buckling of polyethylene cylindrical shells in axial compression has been investigated. The changes in the shape of the shell surface up to loss of stability were measured with a special radial deflection gauge. The experimentally determined shape of the buckled surface at discrete moments of time is approximated by a double Fourier series. The characteristic coefficients of the series of importance in creep buckling are established. From an analysis of the coefficients of the series it follows that the amplitudes of the axisymmetric coefficients diminish with time, while those of the coefficients giving a nonaxisymmetric buckled shape grow.
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