List of Journal Publications
2013
6.
Vandoren, B., Proft, K. De, Simone, A., Sluys, L. J.
Mesoscopic modelling of masonry using weak and strong discontinuities Journal Article
In: COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, vol. 255, pp. 167–182, 2013.
Abstract | BibTeX | Tags: Damage, GFEM, Masonry, Mesoscopic model, Partition of unity, Weak discontinuities | Links:
@article{Vandoren2013a,
title = {Mesoscopic modelling of masonry using weak and strong discontinuities},
author = {B. Vandoren and K. De Proft and A. Simone and L. J. Sluys},
doi = {10.1016/j.cma.2012.11.005},
year = {2013},
date = {2013-01-01},
journal = {COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING},
volume = {255},
pages = {167–182},
publisher = {ELSEVIER SCIENCE SA},
abstract = {A mesoscopic masonry model is presented in which joints are modelled by weak and strong discontinuities through the partition of unity property of finite element shape functions. A Drucker-Prager damage model describes joint degradation whereas the bricks remain linear elastic throughout the simulations. Analogies and differences amongst strong and weak discontinuity models are discussed, with special emphasis on kinematic description and implementation. Mesh sensitivity and performance of the presented models are illustrated by two-brick, three-point bending and shear wall tests.},
keywords = {Damage, GFEM, Masonry, Mesoscopic model, Partition of unity, Weak discontinuities},
pubstate = {published},
tppubtype = {article}
}
A mesoscopic masonry model is presented in which joints are modelled by weak and strong discontinuities through the partition of unity property of finite element shape functions. A Drucker-Prager damage model describes joint degradation whereas the bricks remain linear elastic throughout the simulations. Analogies and differences amongst strong and weak discontinuity models are discussed, with special emphasis on kinematic description and implementation. Mesh sensitivity and performance of the presented models are illustrated by two-brick, three-point bending and shear wall tests.
2011
5.
Radtke, F. K. F., Simone, A., Sluys, L. J.
A partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites Journal Article
In: INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, vol. 86, no. 4-5, pp. 453–476, 2011.
Abstract | BibTeX | Tags: Damage, Fibre-reinforced composite, Fibre-reinforced concrete, Finite element method, Partition of unity finite element method | Links:
@article{Radtke2011,
title = {A partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites},
author = {F. K. F. Radtke and A. Simone and L. J. Sluys},
doi = {10.1002/nme.3056},
year = {2011},
date = {2011-01-01},
journal = {INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING},
volume = {86},
number = {4-5},
pages = {453–476},
abstract = {We present a partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites. Fibres are superimposed on a background mesh without meshing them. The constitutive behaviour of the matrix material, the fibre material and the fibre-matrix bond can be independently defined. A concise derivation of the discrete governing equations is given for two classes of continuum damage models describing the matrix material. A non-linear bond-slip law including debonding and fibre pull-out behaviour is used. Several examples illustrate the potential of the proposed approach.},
keywords = {Damage, Fibre-reinforced composite, Fibre-reinforced concrete, Finite element method, Partition of unity finite element method},
pubstate = {published},
tppubtype = {article}
}
We present a partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites. Fibres are superimposed on a background mesh without meshing them. The constitutive behaviour of the matrix material, the fibre material and the fibre-matrix bond can be independently defined. A concise derivation of the discrete governing equations is given for two classes of continuum damage models describing the matrix material. A non-linear bond-slip law including debonding and fibre pull-out behaviour is used. Several examples illustrate the potential of the proposed approach.
2010
4.
F., Radtke F. K., A., Simone, J., Sluys L.
A computational model for failure analysis of fibre reinforced concrete with discrete treatment of fibres Journal Article
In: ENGINEERING FRACTURE MECHANICS, vol. 77, no. 4, pp. 597–620, 2010.
Abstract | BibTeX | Tags: Damage, Failure analysis, Fibre reinforced concrete, Finite element method | Links:
@article{F.K.F.2010a,
title = {A computational model for failure analysis of fibre reinforced concrete with discrete treatment of fibres},
author = {Radtke F. K. F. and Simone A. and Sluys L. J.},
doi = {10.1016/j.engfracmech.2009.11.014},
year = {2010},
date = {2010-01-01},
journal = {ENGINEERING FRACTURE MECHANICS},
volume = {77},
number = {4},
pages = {597–620},
abstract = {Failure patterns and mechanical behaviour of high-performance fibre reinforced cementitious composites depend on the distribution of fibres within a specimen. In this contribution, we propose a novel computational approach to describe failure processes in fibre reinforced concrete. A discrete treatment of fibres enables us to study the influence of various fibre distributions on the mechanical properties of the material. To ensure numerical efficiency, fibres are not explicitly discretized but they are modelled by applying discrete forces to a background mesh. The background mesh represents the matrix while the discrete forces represent the interaction between fibres and matrix. These forces are assumed to be equal to fibre pull-out forces. With this approach experimental data or micro mechanical models, including detailed information about the fibre–matrix interface, can be directly incorporated into the model.},
keywords = {Damage, Failure analysis, Fibre reinforced concrete, Finite element method},
pubstate = {published},
tppubtype = {article}
}
Failure patterns and mechanical behaviour of high-performance fibre reinforced cementitious composites depend on the distribution of fibres within a specimen. In this contribution, we propose a novel computational approach to describe failure processes in fibre reinforced concrete. A discrete treatment of fibres enables us to study the influence of various fibre distributions on the mechanical properties of the material. To ensure numerical efficiency, fibres are not explicitly discretized but they are modelled by applying discrete forces to a background mesh. The background mesh represents the matrix while the discrete forces represent the interaction between fibres and matrix. These forces are assumed to be equal to fibre pull-out forces. With this approach experimental data or micro mechanical models, including detailed information about the fibre–matrix interface, can be directly incorporated into the model.
2008
3.
Pedersen, R. R., Simone, A., Sluys, L. J.
An analysis of dynamic fracture in concrete with a continuum visco-elastic visco-plastic damage model Journal Article
In: ENGINEERING FRACTURE MECHANICS, vol. 75, no. 13, pp. 3782–3805, 2008.
Abstract | BibTeX | Tags: Damage, Stefan effect, Visco-elasticity, Visco-plasticity | Links:
@article{Pedersen2008,
title = {An analysis of dynamic fracture in concrete with a continuum visco-elastic visco-plastic damage model},
author = {R. R. Pedersen and A. Simone and L. J. Sluys},
doi = {10.1016/j.engfracmech.2008.02.004},
year = {2008},
date = {2008-01-01},
journal = {ENGINEERING FRACTURE MECHANICS},
volume = {75},
number = {13},
pages = {3782–3805},
abstract = {We present a rate-dependent continuum model for the dynamic modelling of concrete. Rate dependency is included by means of visco-elastic and visco-plastic constitutive relationships. The inclusion of the Stefan effect, described by a visco-elastic model, results in an increased tensile strength with increasing loading rate. An additional rate effect comes from the visco-plastic contribution which, from a mechanical standpoint, can be related to the micro-inertia of the material surrounding the crack tip. Static and dynamic examples show the capabilities of the model with respect to localization, hysteresis and dissipation of energy.},
keywords = {Damage, Stefan effect, Visco-elasticity, Visco-plasticity},
pubstate = {published},
tppubtype = {article}
}
We present a rate-dependent continuum model for the dynamic modelling of concrete. Rate dependency is included by means of visco-elastic and visco-plastic constitutive relationships. The inclusion of the Stefan effect, described by a visco-elastic model, results in an increased tensile strength with increasing loading rate. An additional rate effect comes from the visco-plastic contribution which, from a mechanical standpoint, can be related to the micro-inertia of the material surrounding the crack tip. Static and dynamic examples show the capabilities of the model with respect to localization, hysteresis and dissipation of energy.
2004
2.
Simone, A., Sluys, L. J.
The use of displacement discontinuities in a rate-dependent medium Journal Article
In: COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, vol. 193, no. 27-29, pp. 3015–3033, 2004.
Abstract | BibTeX | Tags: Damage, Displacement discontinuities, Partition of unity, Plasticity, Rate dependence, Regularised continuum | Links:
@article{Simone2004b,
title = {The use of displacement discontinuities in a rate-dependent medium},
author = {A. Simone and L. J. Sluys},
doi = {10.1016/j.cma.2003.08.006},
year = {2004},
date = {2004-01-01},
journal = {COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING},
volume = {193},
number = {27-29},
pages = {3015–3033},
abstract = {This paper illustrates the use of displacement discontinuities in a rate-dependent elastoplastic-damage model. Rate-dependency is considered in the framework of Perzyna viscoplasticity. Displacement discontinuities are incorporated using the partition of unity property of finite-element shape functions. A combined continuous–discontinuous approach is proposed in which a discontinuity is only inserted after a certain amount of damage. Various examples illustrate the applicability of the combined approach to granular and quasi-brittle materials with and without fibre-reinforcement.},
keywords = {Damage, Displacement discontinuities, Partition of unity, Plasticity, Rate dependence, Regularised continuum},
pubstate = {published},
tppubtype = {article}
}
This paper illustrates the use of displacement discontinuities in a rate-dependent elastoplastic-damage model. Rate-dependency is considered in the framework of Perzyna viscoplasticity. Displacement discontinuities are incorporated using the partition of unity property of finite-element shape functions. A combined continuous–discontinuous approach is proposed in which a discontinuity is only inserted after a certain amount of damage. Various examples illustrate the applicability of the combined approach to granular and quasi-brittle materials with and without fibre-reinforcement.
2003
1.
Simone, A., Wells, G. N., Sluys, L. J.
From continuous to discontinuous failure in a gradient-enhanced continuum damage model Journal Article
In: COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, vol. 192, no. 41-42, pp. 4581–4607, 2003.
Abstract | BibTeX | Tags: Damage, Discontinuities, Enriched finite-elements, Fracture, Gradient-enhanced continuum, Non-local continuum, Partition of unity | Links:
@article{Simone2003a,
title = {From continuous to discontinuous failure in a gradient-enhanced continuum damage model},
author = {A. Simone and G. N. Wells and L. J. Sluys},
doi = {10.1016/S0045-7825(03)00428-6},
year = {2003},
date = {2003-01-01},
journal = {COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING},
volume = {192},
number = {41-42},
pages = {4581–4607},
publisher = {Elsevier},
abstract = {A computational framework for the description of the combined continuous–discontinuous failure in a regularised strain-softening continuum is proposed. The continuum is regularised through the introduction of gradient terms into the constitutive equations. At the transition to discrete failure, the problem fields are enhanced through a discontinuous interpolation based on the partition of unity paradigm of finite-element shape functions. The inclusion of internal discontinuity surfaces, where boundary conditions are applied without modifications of the original finite-element mesh, avoids the unrealistic damage growth typical of this class of regularised continuum models. Combined models allow for the analysis of the entire failure process, from diffuse microcracking to localised macrocracks. The discretisation procedure is described in detail and numerical examples illustrate the performance of the combined continuous–discontinuous approach.},
keywords = {Damage, Discontinuities, Enriched finite-elements, Fracture, Gradient-enhanced continuum, Non-local continuum, Partition of unity},
pubstate = {published},
tppubtype = {article}
}
A computational framework for the description of the combined continuous–discontinuous failure in a regularised strain-softening continuum is proposed. The continuum is regularised through the introduction of gradient terms into the constitutive equations. At the transition to discrete failure, the problem fields are enhanced through a discontinuous interpolation based on the partition of unity paradigm of finite-element shape functions. The inclusion of internal discontinuity surfaces, where boundary conditions are applied without modifications of the original finite-element mesh, avoids the unrealistic damage growth typical of this class of regularised continuum models. Combined models allow for the analysis of the entire failure process, from diffuse microcracking to localised macrocracks. The discretisation procedure is described in detail and numerical examples illustrate the performance of the combined continuous–discontinuous approach.
