Search results | TU Delft Repositories

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Dekhovich, A. (author), Turan, O.T. (author), Jiaxiang, Y. (author), Bessa, M.A. (author)

Data-driven modeling in mechanics is evolving rapidly based on recent machine learning advances, especially on artificial neural networks. As the field matures, new data and models created by different groups become available, opening possibilities for cooperative modeling. However, artificial neural networks suffer from catastrophic...

journal article 2023

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Fatigue life improvement of cracked aluminum 6061‐T6 plates repaired by composite patches

Yousefi, Armin (author), Jolaiy, Saman (author), Hedayati, R. (author), Serjouei, Ahmad (author), Bodaghi, Mahdi (author)

Bonded patches are widely used in several industry sectors for repairing damaged plates, cracks in metallic structures, and reinforcement of damaged structures. Composite patches have optimal properties such as high strength‐to‐weight ratio, easiness in being applied, and high flexibility. Due to recent rapid growth in the aerospace industry,...

journal article 2021

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Analysis of elastoplastic response of maritime structures in breaking waves using a double pendulum with a friction hinge

van Zanten, Renée (author)

Waves impacting on maritime structures can cause damage which endangers the environment around these structures. Due to high hydrodynamic loading, structures can enter the plastic regime, resulting possibly in structural failure. The understanding of the principles related to this structural failure due to waves is a key concept in this research...

master thesis 2020

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Improved Constitutive Model for Mesoscale Modelling of Unidirectional Composites

Rajadhyaksha, Siddhesh (author)

This era of science and technology has seen widespread use of composite materials for a variety of applications ranging from the defense sector to the transport and construction sectors. Composites are mainly comprised of fibres impregnated with a polymeric matrix and have a superior strength to weight ratio as compared to traditional...

master thesis 2020

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Deep learning predicts path-dependent plasticity

Mozaffar, M. (author), Bostanabad, R. (author), Chen, W. (author), Ehmann, K. (author), Cao, J. (author), Bessa, M.A. (author)

Plasticity theory aims at describing the yield loci and work hardening of a material under general deformation states. Most of its complexity arises from the nontrivial dependence of the yield loci on the complete strain history of a material and its microstructure. This motivated 3 ingenious simplifications that underpinned a century of...

journal article 2019

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Prediction of oedometer terminal densities through a memory-enhanced cyclic model for sand

Liu, H. (author), Pisano, F. (author)

Predicting the cyclic response of soils is still challenging in many geotechnical applications. In this area, the continual efforts on the constitutive modelling of cyclic sand behaviour demand new and reliable dataset for model validation - even more so for loading conditions involving numerous loading cycles ('high-cyclic' loading). This paper...

journal article 2019

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Investigating the size effect in SENB specimens with a triaxiality and Lode angle based damage model

Coppejans, Okko (author)

This master thesis is built up around two questions. First: Is it possible to calibrate a ductile failure model, where the strain at failure is a function of stress triaxiality and Lode angle, using only a single SENB specimen? The failure model that is referred to describes local failure in a finite element model to simulate ductile fracture....

master thesis 2017

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Micromechanical validation of a mesomodel for plasticity in composites

van der Meer, F.P. (author)

In this paper, the performance of a recent homogenized orthotropic plasticity model for fiber reinforced composites (Vogler et al. (2013)) is investigated by comparing the model response against a micromechanical model. It is assumed that the micromechanical model which contains a recent plasticity model for polymers (Melro et al. (2013a,b))...

journal article 2016

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Evaluating delamination growth in composites under dynamic loading using infrared thermography

Narayana Swamya, J.K. (author), Lahuerta, F (author), Anisimov, A. (author), Nijssen, R.P.L. (author), Groves, R.M. (author)

In this paper, a method has been developed to use thermography for the quantitative analysis of a delamination area under dynamic loading. To demonstrate this method, a coupon was developed with double shear configuration and an initial delamination consisting of a PTFE insert. The coupon was tested under fatigue loading and an infrared (IR)...

conference paper 2016

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Experimental/numerical characterization of hygrothermal ageing in glass/epoxy composites

Rocha, I.B.C.M. (author), Raijmaekers, S (author), Nijssen, RPL (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)

In this work, a combined experimental/numerical approach is used to investigate the effect of water ingression in glass/epoxy composite specimens. Interlaminar shear (ILS) specimens were immersed at 50◦C for multiple durations and tested. Re-dried specimens were also tested. Significant strength degradation of up to 50% was found for wet...

conference paper 2016

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Experimental/numerical study of anisotropic water diusion in glass/epoxy composites

Rocha, I.B.C.M. (author), Raijmaekers, S (author), Nijssen, RPL (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)

In this work a glass/epoxy composite commonly used in wind turbine blades is exposed to a humid environment at an elevated temperature. To research the anisotropic di_usion behaviour observed in unidirectional composite specimens, experimental results of slices cut along the three directional planes of the laminate immersed in demineralised...

conference paper 2016

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Micromechanics-based validation of a mesomodel for matrix nonlinearity

van der Meer, F.P. (author)

The performance of a mesomechanical constitutive law for composites is assessed through comparison with micromechanical model results. In this paper, results are presented for non-monotonic strain histories obtained from mesomechanical simulation of a shear dominated delamination test.

conference paper 2016

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A plane stress softening plasticity model for orthotropic materials

Lourenco, P.B. (author), De Borst, R. (author), Rots, J.G. (author)

journal article 1997

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Viscoplasticity for instabilities due to strain softening and strain-rate softening

Wang, W.M. (author), Sluys, L.J. (author), De Borst, R. (author)

journal article 1997

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A composite plasticity model for concrete

Feenstra, P.H. (author), De Borst, R. (author)