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Alves Maia, M. (author), Rocha, I.B.C.M. (author), Kerfriden, P. (author), van der Meer, F.P. (author)Driven by the need to accelerate numerical simulations, the use of machine learning techniques is rapidly growing in the field of computational solid mechanics. Their application is especially advantageous in concurrent multiscale finite element analysis (FE<sup>2</sup>) due to the exceedingly high computational costs often associated with it...journal article 2023
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Kovacevic, D. (author), Sundararajan, Bharath K. (author), van der Meer, F.P. (author)A microscale numerical framework for modeling creep rupture in unidirectional composites under off-axis loading is presented, building on recent work on imposing off-axis loading on a representative volume element. Creep deformation of the thermoplastic polymer matrix is accounted for by means of the Eindhoven Glassy Polymer material model....journal article 2023
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Rocha, I.B.C.M. (author), Kerfriden, P. (author), van der Meer, F.P. (author)In this work we present a hybrid physics-based and data-driven learning approach to construct surrogate models for concurrent multiscale simulations of complex material behavior. We start from robust but inflexible physics-based constitutive models and increase their expressivity by allowing a subset of their material parameters to change in...journal article 2023
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Kovacevic, D. (author), van der Meer, F.P. (author)In this paper, a micromechanical framework for modeling the rate-dependent response of unidirectional composites subjected to off-axis loading is introduced. The model is intended for a thin slice representative volume element that is oriented perpendicular to the reinforcement of the composite material. The testing conditions from a uniaxial...journal article 2022
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Taumaturgo Mororo, L.A. (author), Poot, A. (author), van der Meer, F.P. (author)The Thick Level Set method (TLS) is an approach for non-local damage modeling in which the damage evolution is linked to the movement of a damage front described with the level set method. More recently, a new version of the TLS, designated as the TLSV2, has been proposed as a new concept for coupling continuum damage modeling and discrete...journal article 2022
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Kovacevic, D. (author), Sundararajan, Bharath K. (author), van der Meer, F.P. (author)In this paper we develop a finite deformation micromechanical framework for modeling rate-dependent failure in unidirectional composites under off-axis loading. The model performance is compared with original experiments on thermoplastic carbon/PEEK composites tested at different strain-rates and off-axis angles. To achieve quantitative...journal article 2022
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Hofman, P. (author), Ke, L. (author), van der Meer, F.P. (author)A common choice for multiscale modeling of the mechanical response of composites is to use periodic boundary conditions (PBCs) on square and cubical representative volume elements (RVEs). However, when strain localization occurs in the micromodel, these PBCs are unable to reproduce the transverse isotropy of composite materials with a random...journal article 2022
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van der Meer, F.P. (author), Kovacevic, D. (author)A micromechanical framework for modeling failure in unidirectional (UD) thermoplastic composites under rate-dependent off-axis loading is presented, with the aim to predict and analyze transverse matrix cracking under various load conditions. The onset of global softening in the micromodel corresponds to macroscopic matrix crack initiation. The...conference paper 2022
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Alves Maia, M. (author), Rocha, I.B.C.M. (author), van der Meer, F.P. (author)In a concurrent (FE2) multiscale modeling is an increasingly popular approach for modeling complex materials. As such, it is especially suited for modeling composites, as their complex microstructure can be explicitly modeled and nested to each integration point of the macroscale. However, this generality is often associated with exceedingly...conference paper 2022
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Ke, L. (author), van der Meer, F.P. (author)Due to the complex underlying microscopic damage processes, the failure behavior of composite materials is challenging to understand and predict. Fracture mechanics approaches [1] and cohesive zone models [2] that simulate delamination generally consider the fracture energy as a material characteristic that exclusively depends on the fracture...conference paper 2022
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Rocha, I.B.C.M. (author), Kerfriden, P. (author), van der Meer, F.P. (author)Concurrent multiscale finite element analysis (FE<sup>2</sup>) is a powerful approach for high-fidelity modeling of materials for which a suitable macroscopic constitutive model is not available. However, the extreme computational effort associated with computing a nested micromodel at every macroscopic integration point makes FE<sup>2</sup>...journal article 2021
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Dekker, R. (author), van der Meer, F.P. (author), Maljaars, Johan (author), Sluys, Lambertus J. (author)A numerical model for corrosion pit propagation under mechanical loading is presented. The level set method is used for corrosion front tracking and also enables the domain to be split into a solid and a pit domain. In the pit the diffusion of atoms originating from the dissolution process occurring at the pit front is simulated. The model is...journal article 2021
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Liu, Y. (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author), Ke, L. (author)The mode-I dynamic fracture energy and failure mechanisms of glass fiber-reinforced polymer composites are investigated with an embedded cell model of the single-edge-notched-tension (SENT) geometry. Under an applied dynamic loading, a crack may propagate in the embedded microstructure, accompanied by the development of a fracture process...journal article 2021
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Mororó, L. A. T. (author), van der Meer, F.P. (author)The thick level set (TLS) method has been proposed as a nonlocal damage model for the modeling of failure in solids being able to deal with crack initiation, branching, and merging. The nonlocality of the TLS is achieved by introducing a characteristic length into the problem. This way, the TLS does not suffer from spurious localization in the...journal article 2021
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Dekker, R. (author), van der Meer, F.P. (author), Maljaars, J. (author), Sluys, Lambertus J. (author)This study presents calibration and validation of a cohesive extended finite element model for fatigue crack propagation in ductile materials. The approach relies on a separation between plasticity around the crack tip and fatigue crack growth at the crack tip such that the influence of plasticity on fatigue driving forces is predicted. This...journal article 2021
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van Woudenberg, T.R. (author), van der Meer, F.P. (author)In the design of steel structures, optimization methods can find minimum weight solutions. However, the solutions tend to have a high diversity of profiles, thereby raising costs. Grouping methods provide a solution by limiting the number of unique profiles, while still providing an optimal solution. This study proposes a new grouping method and...journal article 2021
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Taumaturgo Mororo, L.A. (author), van der Meer, F.P. (author)The Thick Level Set (TLS) method has been proposed as a new approach to the modeling of damage growth in solids. The fronts of damaged zones are implicitly represented as a level set of an auxiliary field whose evolution is accomplished by the level set method. The TLS model contains a characteristic length to obtain a non-local description...journal article 2020
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Rocha, I.B.C.M. (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)This work presents a reduced-order modeling framework that precludes the need for offline training and adaptively adjusts its lower-order solution space as the analysis progresses. The analysis starts with a fully-solved step and elements are clustered based on their strain response. Elements with the highest strains are solved with a local...journal article 2020
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Rocha, I.B.C.M. (author), Kerfriden, P. (author), van der Meer, F.P. (author)Although being a popular approach for the modeling of laminated composites, mesoscale constitutive models often struggle to represent material response for arbitrary load cases. A better alternative in terms of accuracy is to use the FE<sup>2</sup> technique to upscale microscopic material behavior without loss of generality, but the...journal article 2020
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Giesen Loo, Erik (author), van der Meer, F.P. (author)The accuracy of multiscale modeling approaches for the analysis of heterogeneous materials hinges on the representativeness of the micromodel. One of the issues that affects this representativeness is the application of appropriate boundary conditions. Periodic boundary conditions are the most common choice. However, when localization takes...journal article 2020