... Abstract In this paper, Perzyna-type viscoplastic rate equations are integrated for a time step by considering the step as stress-driven. Depending on how the increment is imposed (constant, linear etc.), different strategies arise. The secant compliance is obtained by truncated expansion...

... surface. Markers indicate the 14 selected time steps for the hydro-mechanical simulations, adapted from Kempka & Kühn (2013). starting data set for the subsequent hydro-mechanical simulations. For that purpose, a so called one-way hydro- mechanical coupling concept was applied, whereas spatial pore...

...), which is the 1D configuration, we assume that each step of the propa- gation of the localisation zone produces 1 pulse such that timewise the pulses are separated by the time step. Two cases are considered: equal time step T of propa- gation of the localisation zone and randomly disturbed time steps...

... lev- els tj,} = I, , N, with the time steps 6tj = Ij - tj-v- It gives the following time stepping algorithm: for} = I, ,N: find orj: B(j)orj =[M +86tK lorj =cj_ h_ h } h_ , find y'j : A"y'j = hj. Above, Mil is the capacitance matrix, Kil is the con- ductivity matrix, Ail is the stiffness matrix, 8 E...

... with respect to stresses, displacement and deformation etc. which are accepted by numerical calculation. Calculations in this paper includes eleven stages, whose time steps are 100, 1000,2000,3000,, 10,000 respectively. Four stages of 100, 1000, 3000 and 5000 time steps are chosen to interpret the development...

... ABSTRACT: Viscoplasticity is now regarded as a well established framework for the numerical solutions of plasticity problems. In order to numerically implement viscoplasticity in an efficient way, time step control is essential. The determination of the optimum magnitudes of time steps...

... a fictitious quantity in the analysis. This approach, however, requires the establishment of appropriate time steps and, in this paper, we emphasize the study of the computational technique in terms of efficiency, convergence and stability of the numerical implementation. A finite element program is being...