Searched for: subject:"Fracture%5C+energy"
(1 - 9 of 9)
document
Vegt, I. (author), Weerheijm, J. (author)
The mechanical response of concrete is represented in the load-deformation curve which shows the response up to maximum strength as well as the post-peak response up to complete failure. Dynamic tests exhibit an extensive rate effect on the tensile strength beyond loading rates of about 50 GPa/s (strain rates > 1/s). Whether the apparent...
conference paper 2015
document
Lu, Y. (author), Xu, J. (author), Weerheijm, J. (author)
This paper presents a numerical modelling study on the simulation of the cracking process and fracture energy in concrete under high strain rate. To capture the stress wave effect and the damage evolution at the meso-length scale, both a homogeneous model with a millimetre-resolution mesh and an explicit heterogeneous mesoscale model with random...
conference paper 2013
document
Forquin, P. (author), Riedel, W. (author), Weerheijm, J. (author)
Owing to their low tensile failure strain, concrete is a difficult material to test under dynamic tensile loading. Indeed, conventional testing apparatuses such as high-speed hydraulic presses or Split Hopkinson Bar facilities rely on a mechanical balance of the specimen implying a short round-trip time in the specimen in comparison with the...
bookPart 2013
document
Weerheijm, J. (author), Forquin, P. (author)
The response of concrete up to complete failure in tension is represented in the load deformation relation. The characteristic parameters are the ultimate strength, stiffness in the ascending branch and the fracture energy. All these parameters depend on concrete composition and environmental conditions, as discussed in the previous chapters....
bookPart 2013
document
Weerheijm, J. (author), Vegt, I. (author)
Data on the dynamic fracture energy of concrete are scarce and also not consistent due to different test methods, data analyses and definitions. In [1] the authors summarized and evaluated the test methods. Suggestions for the standardization of dynamic tensile testing were given. In the current paper the discussion is continued. First,...
conference paper 2011
document
Schlangen, E. (author), Lim, H.S. (author), Weerheijm, J. (author), TNO Defensie en Veiligheid (author)
In the study the effect of scaling the material structure on the fracture behaviour of concrete is investigated. Next to this the size effect of concrete fracture strength and fracture energy is studied. The fracture mechanism of concrete made with different size aggregates are tested numerically. A lattice type fracture model is adopted to...
conference paper 2005
document
van der Pluijm, R. (author), Instituut voor Bouwmaterialen en Bouwconstructies TNO (author)
For the micro-modelling of masonry in numerical programs that take non-linear behaviour into account, a complete description of the behaviour of masonry components has to be available. "Complete" means that, apart from the initial stiffness and the strength, the behaviour beyond the peak in the σ-ε diagram is described. This article gives an...
article 1997
document
Lourenço, P.B. (author), de Borst, R. (author), Rots, J.G. (author), TNO Bouw (author)
A plane stress model has been developed for quasi-brittle orthotropic materials. The theory of plasticity, which is adopted to describe the inelastic behaviour, utilizes modern algorithmic concepts, including an implicit Euler backward return mapping scheme, a local Newton-Raphson method and a consistent tangential stiffness matrix. The model is...
article 1997
document
van Doormaal, J.C.A.M. (author), Weerheijm, J. (author), Sluys, L.J. (author)
In an experimental programme, impact tensile tests were performed on notched and unnotched specimens in a Split Hopkinson Bar apparatus to determine the dynamic fracture energy of concrete. The results have been compared to static experiments. In order to distinguish structural and material response the experiments were numerically simulated....
article 1994
Searched for: subject:"Fracture%5C+energy"
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