Creep buckling of an eccentrically loaded column

A number of experimenters investigating the buckling of columns at elevated temperatures [1–3] have noted a significant scatter of the experimental values of the buckling time. Below, an attempt is made to account for this scatter in terms of eccentricity in the application of the load.     

Creep buckling of axially compressed circular cylindrical shells of a zirconium alloy: Experiment and computer simulation

Experiments were performed to study the deformation and buckling of axially compressed circular cylindrical shells of Zr2.5Nb zirconium alloy under creep conditions. Computer simulation using the MSC.Marc 2012 software was conducted by step-by-step integration of the equations of quasistatic deformation of thin shells using Norton’s law of steady creep. The results of the experiment and computer simulation show that the buckling modes are a combination of axisymmetric bulges located near one end or both ends of the shell and axisymmetric buckling modes with the formation of three or four waves in the circumferential direction. A comparison is made of the time dependences of the axial strain of the shells obtained in the experiment and by computer simulation. It is shown that for large axial compressive stresses, these dependences are in satisfactory agreement. For lower values of these stresses, the difference between the theoretical and experimental dependences is greater.     

On rupture attributable to creep

The results of creep rupture tests carried out in a plane-stressed state are presented; the experiments confirm the validity of an earlier energy approach as regards the time to rupture under creep conditions [1],Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 6, pp. 140–143, November–December, 1973.     

Stability of glass-reinforced plastic columns

The stability of circular columns of unidirectional glass-reinforced plastic (EF-32-301) is investigated for two types of end conditions: hinged at both ends and one end hinged, the other fixed. The experimental data are compared with theory [1]. A relationship is established between the change in reduced length and the shear parameter.Institute of Hydrodynamics, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Mekhanika Polimerov, Vol. 4, No. 5, pp. 906–910, September–October, 1968.