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Storm, J. (author), Rocha, I.B.C.M. (author), van der Meer, F.P. (author)
Simulating the mechanical response of advanced materials can be done more accurately using concurrent multiscale models than with single-scale simulations. However, the computational costs stand in the way of the practical application of this approach. The costs originate from microscale Finite Element (FE) models that must be solved at every...
journal article 2024
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Mirkhalaf, Mohsen (author), Rocha, I.B.C.M. (author)
During the last few decades, industries such as aerospace and wind energy (among others) have been remarkably influenced by the introduction of high-performance composites. One challenge, however, for modeling and designing composites is the lack of computational efficiency of accurate high-fidelity models. For design purposes, using...
journal article 2024
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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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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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Starkova, Olesja (author), Gagani, Abedin I. (author), Karl, Christian W. (author), Rocha, I.B.C.M. (author), Burlakovs, Juris (author), Krauklis, Andrey E. (author)
Polymers and polymer composites are negatively impacted by environmental ageing, reducing their service lifetimes. The uncertainty of the material interaction with the environment compromises their superior strength and stiffness. Validation of new composite materials and structures often involves lengthy and expensive testing programs....
journal article 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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Krauklis, Andrey E. (author), Karl, Christian W. (author), Rocha, I.B.C.M. (author), Burlakovs, Juris (author), Ozola-Davidane, Ruta (author), Gagani, Abedin I. (author), Starkova, Olesja (author)
Service lifetimes of polymers and polymer composites are impacted by environmental ageing. The validation of new composites and their environmental durability involves costly testing programs, thus calling for more affordable and safe alternatives, and modelling is seen as such an alternative. The state-of-the-art models are systematized in...
review 2022
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Barroso, Elias Saraiva (author), Ribeiro, Leonardo Gonçalves (author), Alves Maia, M. (author), Rocha, I.B.C.M. (author), Parente, Evandro (author), de Melo, Antônio Macário Cartaxo (author)
This paper presents BIOS (acronym for Biologically Inspired Optimization System), an object-oriented framework written in C++, aimed at heuristic optimization with a focus on Surrogate-Based Optimization (SBO) and structural problems. The use of SBO to deal with structural optimization has grown considerably in recent years due to the...
journal article 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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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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Rocha, I.B.C.M. (author)
Although being a crucial step in structural design of laminated composites, prediction of their long-term mechanical performance remains a challenging task for which no comprehensive and reliable solution is currently available. Nevertheless, structures such as wind turbine blades, of which laminated composites constitute the main load bearing...
doctoral thesis 2019
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Rocha, I.B.C.M. (author), van der Meer, F.P. (author), Raijmaekers, S. (author), Lahuerta, F. (author), Nijssen, R. P.L. (author), Mikkelsen, L. P. (author), Sluys, Lambertus J. (author)
This work investigates hygrothermal aging degradation of unidirectional glass/epoxy composite specimens through a combination of experiments and numerical modeling. Aging is performed through immersion in demineralized water. Interlaminar shear testes are performed after multiple conditioning times and after single immersion/redrying cycles....
journal article 2019
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Rocha, I.B.C.M. (author), van der Meer, F.P. (author), Raijmaekers, S. (author), Lahuerta, F. (author), Nijssen, R. P.L. (author), Sluys, Lambertus J. (author)
This paper investigates the viscoelastic/viscoplastic/fracture behavior of an epoxy resin. A state-of-the-art pressure-dependent elastoplastic constitutive model (Melro et al. 2013) is expanded to include viscoelasticity, viscoplasticity and a modified damage formulation with linear softening and shrinking pressure-dependent fracture surface. A...
journal article 2019
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van der Meer, F.P. (author), Raijmaekers, Sibrand (author), Rocha, I.B.C.M. (author)
Characterization of the mechanical properties of the fiber/matrix interface is a challenge that needs to be addressed to enable accurate micromechanical modeling of failure in composite materials. In this paper a numerical investigation is presented into one of the tests that has been proposed for measuring these interfacial properties. A new...
journal article 2019
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Rocha, I.B.C.M. (author), van der Meer, F.P. (author), Taumaturgo Mororo, L.A. (author), Sluys, Lambertus J. (author)
Accurate numerical modeling of fracture in solids is a challenging undertaking that often involves the use of computationally demanding modeling frameworks. Model order reduction techniques can be used to alleviate the computational effort associated with these models. However, the traditional offline-online reduction approach is unsuitable...
journal article 2019
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Rocha, I.B.C.M. (author), Raijmaekers, S (author), van der Meer, F.P. (author), Nijssen, R. P.L. (author), Fischer, H. R. (author), Sluys, Lambertus J. (author)
A combined experimental and numerical investigation is conducted on the anisotropic water diffusion behaviour of unidirectional glass/epoxy composites. Experimental diffusivity values are obtained by immersing thin material slices for each of its planes of orthotropy extracted from a thick composite panel and interphase measurements are...
journal article 2017
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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 material system applied in wind turbine blades was used to evaluate degradation processes induced by water ingression. Composite and neat epoxy specimens were conditioned in demineralised water at 50 °C for 4800 h and tested quasi-statically and in fatigue. Comparing results from mechanical tests in composite...
journal article 2017
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Rocha, I.B.C.M. (author), van der Meer, F.P. (author), Nijssen, RPL (author), Sluys, Lambertus J. (author)
In this work, a numerical framework for modelling of hygrothermal ageing in laminated composites is proposed. The model consists of a macroscopic diffusion analysis based on Fick's second law coupled with a multiscale FE<sup>2</sup> stress analysis in order to take microscopic degradation mechanisms into account. Macroscopic material points...
journal article 2017
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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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