TY  - CHAP
A1  - Staat, Manfred
A1  - Heitzer, Michael
T1  - The restricted influence of kinematic hardening on shakedown loads
N2  - Structural design analyses are conducted with the aim of verifying the exclusion of ratcheting. To this end it is important to make a clear distinction between the shakedown range and the ratcheting range. In cyclic plasticity more sophisticated hardening models have been suggested in order to model the strain evolution observed in ratcheting experiments. The hardening models used in shakedown analysis are comparatively simple. It is shown that shakedown analysis can make quite stable predictions of admissible load ranges despite the simplicity of the underlying hardening models. A linear and a nonlinear kinematic hardening model of two-surface plasticity are compared in material shakedown analysis. Both give identical or similar shakedown ranges. Structural shakedown analyses show that the loading may have a more pronounced effect than the hardening model.
KW  - Biomedizinische Technik
KW  - Einspielen <Werkstoff>
KW  - Shakedown
KW  - Ratcheting
KW  - Bruchmechanik
KW  - shakedown
KW  - material shakedown
KW  - linear kinematic hardening
KW  - nonlinear kinematic hardening
KW  - ratchetting
Y1  - 2002
ER  - 
TY  - CHAP
A1  - Staat, Manfred
A1  - Heitzer, Michael
T1  - Direct static FEM approach to limit and shakedown analysis
N2  - Safety and reliability of structures may be assessed indirectly by stress distributions. Limit and shakedown theorems are simplified but exact methods of plasticity that provide safety factors directly in the loading space. These theorems may be used for a direct definition of the limit state function for failure by plastic collapse or by inadaptation. In a FEM formulation the limit state function is obtained from a nonlinear optimization problem. This direct approach reduces considerably the necessary knowledge of uncertain technological input data, the computing time, and the numerical error. Moreover, the direct way leads to highly effective and precise reliability analyses. The theorems are implemented into a general purpose FEM program in a way capable of large-scale analysis.
KW  - Einspielen <Werkstoff>
KW  - Nichtlineare Optimierung
KW  - Shakedown
KW  - Shakedown
KW  - limit load
KW  - lower bound theorem
KW  - nonlinear optimization
KW  - reliability
Y1  - 2000
ER  - 
TY  - CHAP
A1  - Staat, Manfred
A1  - Heitzer, Michael
ED  - Staat, Manfred
ED  - Heitzer, Michael
T1  - Probabilistic limit and shakedown problems
T2  - Numerical methods for limit and shakedown analysis. Deterministic and probabilistic problems
Y1  - 2003
SN  - 3-00-010001-6
N1  - NIC Series
VL  - 15
SP  - 217
EP  - 268
PB  - John von Neumann Institute for Computing (NIC)
CY  - Jülich
ER  - 
TY  - BOOK
A1  - Staat, Manfred
A1  - Heitzer, Michael
T1  - Numerical methods for limit and shakedown analysis. Deterministic and probabilistic problems.
Y1  - 2003
SN  - 3-00-010001-6
N1  - NIC Series Vol. 15 / Ed. by Staat, M; Heitzer, M.
PB  - John von Neumann Institute for Computing (NIC)
CY  - Jülich
ER  - 
TY  - BOOK
A1  - Staat, Manfred
A1  - Heitzer, M.
A1  - Yan, Ai-Min
A1  - Khoi, Vu Duc
A1  - Nguyen, Dang Hung
A1  - Valdoire, F.
A1  - Lahousse, A.
T1  - Limit Analysis of Defects
Y1  - 2000
SN  - 0944-2952
N1  - Bericht des Forschungszentrums, Jül-3746, Jülich (2000)
PB  - Forschungszentrum Jülich
CY  - Jülich
ER  - 
TY  - JOUR
A1  - Staat, Manfred
A1  - Heitzer, M.
A1  - Reiners, H.
A1  - Schubert, F.
T1  - Shakedown and ratchetting under tension–torsion loadings: analysis and experiments
JF  - Nuclear Engineering and Design. 225 (2003), H. 1
Y1  - 2003
SN  - 0029-5493
SP  - 11
EP  - 26
ER  - 
TY  - JOUR
A1  - Staat, Manfred
A1  - Heitzer, M.
A1  - Lang, H.
A1  - Wirtz, K.
T1  - Direct Finite Element Route for Design-by-Analysis of Pressure Components
JF  - International Journal of Pressure Vessels and Piping. 82 (2005), H. 1
Y1  - 2005
SN  - 0308-0161
SP  - 61
EP  - 67
ER  - 
TY  - JOUR
A1  - Staat, Manfred
A1  - Heitzer, M.
T1  - Limit and Shakedown Analysis for Plastic Safety of Complex Structures
JF  - Transactions of the 14th International Conference on Structural Dynamics in Reactor Technology (SMiRT-14) / Livolant, M. [ed]
Y1  - 1997
N1  - Vol. B, Paper B02/2
SP  - 33
EP  - 40
CY  - Lyon
ER  - 
TY  - JOUR
A1  - Staat, Manfred
A1  - Heitzer, M.
T1  - Limit and Shakedown Analysis Using a General Purpose Finite Element Code
JF  - Proceedings of NAFEMS World Congress '97 on Design, Simulation & Optimisation : reliability & applicability of computational methods ; Stuttgart, Germany, 9 - 11 April 1997
Y1  - 1997
SN  - 1-87437-620-4
SP  - 522
EP  - 533
PB  - NAFEMS
CY  - Glasgow
ER  - 
TY  - JOUR
A1  - Staat, Manfred
A1  - Heitzer, M.
T1  - Reliability Analysis of Elasto-Plastic Structures under Variable Loads
JF  - Inelastic analysis of structures under variable loads : theory and engineering applications / Maier, G.; Weichert, D. [ed]
Y1  - 2000
SN  - 0-7923-6645-X
SP  - 269
EP  - 288
PB  - Kluwer Academic Publ.
CY  - Dordrecht
ER  -