Untersuchung des anisotropen Kriechverhaltens vorgeschäadigter Werkstoffe am austenitischen

Betten, Josef; El-Magd, Essam; Meydanli, S. C.; Palmen, P.

doi:10.1007/s004190050007

Cited by 15 publications

(11 citation statements)

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“…Examples are theories of rods, plates shells and three-dimensional solids as well as direct variational methods, e.g. Altenbach et al (1998);Betten (2005); Boyle and Spence (1983); Hyde et al (2013);Malinin (1981); Podgorny et al (1984); Skrzypek (1993). Numerical solution techniques, for example the finite element method can be combined with various time step integration techniques to simulate time dependent structural behavior up to critical state of failure.…”

Section: Modeling Approachesmentioning

confidence: 98%

“…Robinson et al (2003a, b), deep drawing sheets, e.g. Betten (1976Betten ( , 2001, forgings Naumenko and Gariboldi (2014) and multi-pass weld metals Hyde et al (2003). In Kawai (1989) these cases series of uni-axial creep tests for specific loading directions are performed in order to establish the material behavior.…”

Section: Creep Ratementioning

confidence: 98%

“…For example one may interrupt the test after a certain creep exposure, cut specimen in different directions and perform subsequent creep tests to establish the effect of the induced anisotropy. Such tests are discussed in Betten et al (1995);El-Magd et al (1996). Another approach is to subject the specimen to the non-proportional loading with varying principal directions, or in other words to rotate the loading with respect to the material without interrupting the test.…”

Section: Multi-axial and Stress State Effectsmentioning

confidence: 99%

“…Topological details of microstructure are not considered. Processes associated with the microstructural changes like hardening, recovery, ageing and damage can be taken into account by means of hidden or internal state variables and corresponding evolution equations (Betten 2005;Chaboche 2008;Lemaitre and Desmorat 2005;Maugin 1992;Rabotnov 1969;Skrzypek and Ganczarski 1998). Various models and methods developed within the solid mechanics can be applied to the structural analysis in the inelastic range.…”

Section: Modeling Approachesmentioning

confidence: 99%

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Analysis of Inelastic Behavior for High Temperature Materials and Structures

Naumenko

Altenbach

2015

Advanced Structured Materials

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This review provides a current status in modeling and analysis of structures for high-temperature applications. Basic features of inelastic behavior of heat resistant alloys are discussed. Typical responses for stationary and varying loading and temperature are presented and classified. Microstructural features and microstructural changes in the course of inelastic deformation at high temperature are discussed. The state of the art on material modeling and structural analysis in the inelastic range at high temperature is resented.Keywords Creep · Low cycle fatigue · Damage mechanics · Length scales · Temporal scales · Structural analysis IntroductionThe aim of this contribution is to give an overview of experimental and theoretical approaches to analyze the behavior of materials and structures subjected to mechanical loading and "high-temperature" environment. The definition of "hightemperature" materials and "high-temperature" structures can be related to the value of the homologous temperature, that is T /T m , where T is the absolute temperature and T m is the melting point of the considered material. Materials that can be efficiently used within the temperature range 0.3 < T /T m < 0.7 are called hightemperature materials. Examples include heat resistant steels, nickel-bases alloys, age-hardened aluminum alloys, cast iron materials and metal matrix composites. Structures that operate in the temperature range 0.3 < T /T m < 0.7 over a long period of time are called high-temperature structures. Examples include turbine

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Section: Modeling Approachesmentioning

confidence: 98%

Section: Creep Ratementioning

confidence: 98%

Section: Multi-axial and Stress State Effectsmentioning

confidence: 99%

Section: Modeling Approachesmentioning

confidence: 99%

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Analysis of Inelastic Behavior for High Temperature Materials and Structures

Naumenko

Altenbach

2015

Advanced Structured Materials

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“…Because of the different orientation of the intergranular decohesions between grains, damage generally develops anisotropically [14,15]. Experimental investigations [16,17] clearly show the strong influence of the anisotropic evolution of damage on the lifetime when the loading direction changes. In order to predict the mechanical response of metals at elevated temperatures in the whole range from primary to tertiary creep, the respective constitutive equations have to include nonlinear viscoplastic deformation and anisotropic damage.…”

Section: Introductionmentioning

confidence: 99%

On a finite-strain viscoplastic law coupled with anisotropic damage: theoretical formulations and numerical applications

Lin

Brocks

2006

Arch Appl Mech

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Based on a dissipation inequality at finite strains and the effective stress concept, a Chabochetype infinitesimal viscoplastic theory is extended to finite-strain cases coupled with anisotropic damage. The anisotropic damage is described by a rank-two symmetric tensor. The constitutive law is formulated in the corotational material coordinate system. Thus, the evolution equations of all internal variables can be expressed in terms of their material time derivatives. The numerical algorithm for implementing the material model in a finite element programme is also formulated, and several numerical examples are shown. Comparing the numerical simulations with experimental observations indicates that the present material model can describe well the primary, secondary and tertiary creep. It can also predict the anisotropic damage modes observed in experiments correctly.

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