Modeling of strain rate effects for concrete with viscoelasticity and retarded damage

Häußler‐Combe, Ulrich; Kühn, Tino

doi:10.1016/j.ijimpeng.2012.08.002

Cited by 29 publications

(18 citation statements)

References 19 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Also, a common use of dynamic strength increase factors depending on an assumed constant strain rate value seems inappropriate. Phenomenological rules should be replaced with sound approaches on the basis of physical behavior [46].…”

Section: Constitutive Equations For the Rate Dependent Multi-laminatementioning

confidence: 99%

Multi-Laminate Rate-Dependent Modelling of Static and Dynamic Concrete Behavior through Damage Formulation

Sadrnejad

Hoseinzadeh

2017

Scientia Iranica

View full text Add to dashboard Cite

Mathematical simulation of the nonlinear tri-dimensional mechanical behavior of quasi-brittle materials like concrete is one of the biggest challenges in the engineering science. It is vital to have the knowledge of the response of concrete specimens subjected to low and high strain rate deformation for the analysis of concrete structures under the static and dynamic loading cases. The behavior of this material is generally known to be strain rate sensitive. Among phenomena of different orientation, the multi plane models, like multi-laminate models using a constitutive equation in a vectorial form rather than tensorial form by means of capturing interactions, can meet this goal adequately. This paper suggests a robust rate dependent damage based model in the multi-planes framework accomplished with minimum parameters for calibration and appropriate for engineering purposes. This damage formulation has been built on the basis of two types of essential damage, axial damage and shear damage, that basically can happen on each sampling plane and based on this concept two new axial and shear damage functions are proposed. Model verification has been studied under different compressive and tensile loading rates, comparing the results of the proposed model with the experimental data and Mohr-Coulomb failure criterion envelope line.

show abstract

Section: Constitutive Equations For the Rate Dependent Multi-laminatementioning

confidence: 99%

Multi-Laminate Rate-Dependent Modelling of Static and Dynamic Concrete Behavior through Damage Formulation

Sadrnejad

Hoseinzadeh

2017

Scientia Iranica

View full text Add to dashboard Cite

show abstract

“…A history function, derived from a simple Maxwell rheological model, is used to retard the evolution of damage, representing the resistance to micro-cracks growth due to inertia effects. Recently, Haussler-Combe and Kuhn [11] proposed a model to address both viscosity and retarded damage.…”

Section: Rate-dependent Damage Modelmentioning

confidence: 99%

“…Furthermore, it has also been observed that the stress-strain relations in a dynamic setting change with a variation of strain rates in time, i.e. the load history [11]. In other words, in case of an abrupt variation of the strain rate, its effects are not 'felt' instantaneously due to micro dynamic (inertia) phenomena.…”

Section: Introductionmentioning

confidence: 99%

Simulation of dynamic behavior of quasi-brittle materials with new rate dependent damage model

Pereira

Weerheijm²,

Sluijs³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

View full text Add to dashboard Cite

Abstract. In concrete often complex fracture and fragmentation patterns develop when subjected to high straining loads. The proper simulation of the dynamic cracking process in concrete is crucial for good predictions of the residual bearing capacity of structures in the risk of being exposed to extraordinary events like explosions, high velocity impacts or earthquakes.As it is well known, concrete is a highly rate dependent material. Experimental and numerical studies indicate that the evolution of damage is governed by complex phenomena taking place simultaneously at different material scales, i.e. micro, meso and macro-scales. Therefore, the constitutive law, and its rate dependency, must be adjusted to the level of representation. For a proper phenomenological (macroscopic) representation of the reality, the constitutive law has to explicitly describe all phenomena taking place at the lower material scales. Macro-scale inertia effects are implicitly simulated by the equation of motion.In the current paper, dynamic crack propagation and branching is studied with a new rate-dependent stress-based nonlocal damage model. The definition of rate in the constitutive law is changed to account for the inherent meso-scale structural inertia effects. This is accomplished by a new concept of effective rate which governs the dynamic delayed response of the material to variations of the deformation (strain) rate, usually described as micro-inertia effects. The proposed model realistically simulates dynamic crack propagation and crack branching phenomena in concrete.

show abstract

“…The higher velocity in dynamic experiments leads to assumed strain rate effects of the concrete material which is verified by many authors with different significance within the compressive [1] and tensile [2] domain. Nevertheless of the structural influences this effect can be described by numerical models for example as a viscous effect at low rates or a crack retardation effect at higher velocities [3]. With numerical benchmarks of standard experiments it could be shown that the structural and material response could not really separated and therefore the results are difficult to transfer to other structures [4].…”

Section: Principlesmentioning

confidence: 99%

Behavior of RC-slabs under impact-loading

Kühn

Curbach

2015

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

Abstract. In this paper the current state of a research project on the behavior of reinforced concrete slabs subjected to impact loads are presented. As one part of the project several slabs were tested under varying conditions. As a result there failure behavior is analyzed and parameter dependences are studied. Variations like the drop height and drop mass and there substituted drop velocity and energy, the influence of the concrete strength and the level of reinforcement are part of the full project. Additional parameters like impactor size and shapes are evaluated in peripheral. Due to the large number of slabs and parameters combination a consistent database will be created for later benchmark tests and calibration of prediction models. The presented paper gives some insight in the methodology, the problems which need to be solved and first principal example results for public discussion.

show abstract

Modeling of strain rate effects for concrete with viscoelasticity and retarded damage

Cited by 29 publications

References 19 publications

Multi-Laminate Rate-Dependent Modelling of Static and Dynamic Concrete Behavior through Damage Formulation

Multi-Laminate Rate-Dependent Modelling of Static and Dynamic Concrete Behavior through Damage Formulation

Simulation of dynamic behavior of quasi-brittle materials with new rate dependent damage model

Behavior of RC-slabs under impact-loading

Contact Info

Product

Resources

About