A New Model of Nonlinear Dynamic Creep

Creep and damage in shells of revolution under cyclic loading and heating

“…In this case of loading the essential high cycle fatigue damage appears, but dynamic creep acceleration become marginal and disappears for high values of A [12,16].…”

“…Now it is necessary to combine the laws derived for slow (10) and (11) and fast variation of loads due to forced vibrations (13) and (16). Schematically the process of complex loading is illustrated in Fig.…”

“…Validation of the particular parts of Eqs. (19)-(21) for complex stress state had been done [16,18,19,24,[26][27][28]31]. In addition, the thermodynamic justification of those equations was performed.…”

“…For the case of cyclic variation of temperatures or stresses the approach connected with averaging of resulting creep strain curves has been shown to be effective [11][12][13][14][15]. Such clear physical procedure got its mathematical justification by the way of using the methods of asymptotical expansions and averaging over a period of stress or temperature variation [15][16][17].…”

“…Present investigations which have been done in this direction were focused on particular cases of cyclic creep-damage problems. The phenomenon of so-called dynamic creep [12], when cyclic variation of stresses due to forced vibrations is imposed on the static stress component has been investigated for plane creep problems [16]. Further interaction between damage accumulation from dynamic creep process and high cycle high temperature fatigue has been analyzed for thin shells of revolution in [17].…”