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Experimental damage tolerance evaluation of thick fabric carbon/epoxy laminates under low-velocity and high-velocity impact and compression-after-impact

van Hoorn, N. (author), Kassapoglou, C. (author), Turteltaub, S.R. (author), van den Brink, Wouter (author)

Impact experiments of thick fabric carbon/epoxy laminate specimens, with small thickness ratio, are conducted at distinct energy levels and thicknesses to characterise the damage process. These specimens and loading conditions are representative of a new generation of critical structural components in aviation, such as wing spars, landing...

journal article 2022

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Elucidating the effect of cohesive zone length in fracture simulations of particulate composites

Ponnusami, Sathiskumar Anusuya (author), Krishnasamy, J. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)

The influence of the cohesive zone length on the crack driving force is quantified and analyzed in a representative system of particles dispersed in a matrix of a composite material. For heterogeneous material systems, e.g. particulate composites, it is known that as a crack approaches the particles, the crack driving force may increase ...

journal article 2022

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Uncertainty quantification of the lifetime of self-healing thermal barrier coatings based on surrogate modelling of thermal cyclic fracture and healing

Kumthekar, A. (author), Ponnusami, Sathiskumar A. (author), van der Zwaag, S. (author), Turteltaub, S.R. (author)

Computationally-efficient surrogate models based on a Polynomial Chaos Expansion (PCE) are developed to quantify the uncertainties in the fracture behavior and lifetime of a self-healing thermal barrier coating system (SH-TBC) and a benchmark conventional TBC system. The surrogate models are built using deterministic information from...

journal article 2022

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Thermal cyclic behavior and lifetime prediction of self-healing thermal barrier coatings

Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)

The thermal cyclic behavior of self-healing thermal barrier coatings (SH-TBC) is analyzed numerically to develop a lifetime prediction model. Representative microstructures are studied adopting a unit cell based multiscale modeling approach along with a simplified evolution model for the thermally-grown oxide layer (TGO) to study the...

journal article 2021

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Energetically-consistent multiscale analysis of fracture in composites materials

Turteltaub, S.R. (author), Suárez-Millán, Rubén (author)

Two distinct length scale transition methodologies are developed to establish effective traction-separation relations for fracture in composite materials within a hierarchical multiscale framework. The two methodologies, one kinetics-based and the other kinematics-based, specify effective fracture properties that satisfy a surface-based Hill...

journal article 2020

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An enhanced curvature-constrained design method for manufacturable variable stiffness composite laminates

Hong, Z. (author), Peeters, D.M.J. (author), Turteltaub, S.R. (author)

In this paper, design strategies are developed to explore better approaches of enforcing local layer-wise curvature constraints in the optimization of variable stiffness laminates in order to ensure the manufacturability of optimized designs based on the limitations of automated fiber placement. The methods developed here aim to improve an...

journal article 2020

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A comparative analysis of Lagrange multiplier and penalty approaches for modelling fluid-structure interaction

Brandsen, J.D. (author), Viré, A.C. (author), Turteltaub, S.R. (author), van Bussel, G.J.W. (author)

Purpose: When simulating fluid-structure interaction (FSI), it is often essential that the no-slip condition is accurately enforced at the wetted boundary of the structure. This paper aims to evaluate the relative strengths and limitations of the penalty and Lagrange multiplier methods, within the context of modelling FSI, through a...

journal article 2020

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Multiscale modeling of the effect of sub-ply voids on the failure of composite materials

Turteltaub, S.R. (author), de Jong, Gijs (author)

A multiscale fracture model is developed to study the influence of defects appearing at a microscale in a fiber-reinforced composite laminate. The model establishes a link between the geometrical characteristics of sub-ply imperfections that may be created during manufacturing and the overall fracture strength and fracture energy of the...

journal article 2019

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Numerical Investigation into the Effect of Splats and Pores on the Thermal Fracture of Air Plasma-Sprayed Thermal Barrier Coatings

Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)

The effect of splat interfaces on the fracture behavior of air plasma-sprayed thermal barrier coatings (APS-TBC) is analyzed using finite element modeling involving cohesive elements. A multiscale approach is adopted in which the explicitly resolved top coat microstructural features are embedded in a larger domain. Within the computational...

journal article 2019

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A micromechanical fracture analysis to investigate the effect of healing particles on the overall mechanical response of a self-healing particulate composite

Ponnusami, S.A. (author), Krishnasamy, J. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)

A computational fracture analysis is conducted on a self-healing particulate composite employing a finite element model of an actual microstructure. The key objective is to quantify the effects of the actual morphology and the fracture properties of the healing particles on the overall mechanical behaviour of the (MoSi2) particle-dispersed...

journal article 2019

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Computational investigation of porosity effects on fracture behavior of thermal barrier coatings

Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)

The influence of microstructural pore defects on fracture behaviour of Thermal Barrier Coatings (TBC) is analysed using finite element analysis involving cohesive elements. A concurrent multiscale approach is utilised whereby the microstructural features of the TBC are explicitly resolved within a unit cell embedded in a larger domain. Within...

journal article 2019

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Modelling the fracture behaviour of thermal barrier coatings containing healing particles

Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)

The performance of a self-healing Thermal Barrier Coating (TBC) containing dispersed healing particles depends crucially on the mismatch in thermomechanical properties between the healing particles and the TBC matrix. The present work systematically investigates this phenomenon based on numerical simulations using cohesive element-based finite...

journal article 2018

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Multiscale analysis of mixed-mode fracture and effective traction-separation relations for composite materials

Turteltaub, S.R. (author), van Hoorn, Niels (author), Westbroek, Wim (author), Hirsch, C.W. (author)

A multiscale framework for the analysis of fracture is developed in order to determine the effective (homogenized) strength and fracture energy of a composite material based on the constituent's material properties and microstructural arrangement. The method is able to deal with general (mixed-mode) applied strains without a priori knowledge...

journal article 2018

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A cohesive-zone crack healing model for self-healing materials

Ponnusami, Sathiskumar A. (author), Krishnasamy, J. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)

A cohesive zone-based constitutive model, originally developed to model fracture, is extended to include a healing variable to simulate crack healing processes and thus recovery of mechanical properties. The proposed cohesive relation is a composite-type material model that accounts for the properties of both the original and the healing...

journal article 2018

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Determination of fracture strength and fracture energy of (metallo-) ceramics by a wedge loading methodology and corresponding cohesive zone-based finite element analysis

Farle, A.M. (author), Krishnasamy, J. (author), Turteltaub, S.R. (author), Kwakernaak, C. (author), van der Zwaag, S. (author), Sloof, W.G. (author)

A wedge loaded testing methodology to determine the fracture energy and strength of (semi-) brittle (metallo-)ceramics is presented. The methodology combines a tailored specimen geometry and a comprehensive finite element analysis based on cohesive zone modelling. The use of a simulation-based approach to extract both fracture strength and...

journal article 2018

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A discontinuous Galerkin residual-based variational multiscale method for modeling subgrid-scale behavior of the viscous Burgers equation

Stoter, Stein K.F. (author), Turteltaub, S.R. (author), Hulshoff, S.J. (author), Schillinger, Dominik (author)

We initiate the study of the discontinuous Galerkin residual-based variational multiscale (DG-RVMS) method for incorporating subgrid-scale behavior into the finite element solution of hyperbolic problems. We use the one-dimensional viscous Burgers equation as a model problem, as its energy dissipation mechanism is analogous to that of turbulent...

journal article 2018

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Residual-based variational multiscale modeling in a discontinuous Galerkin framework

Stoter, Stein K.F. (author), Turteltaub, S.R. (author), Hulshoff, S.J. (author), Schillinger, Dominik (author)

We develop the general form of the variational multiscale method in a discontinuous Galerkin framework. Our method is based on the decomposition of the true solution into discontinuous coarse-scale and discontinuous fine-scale parts. The obtained coarse-scale weak formulation includes two types of fine-scale contributions. The first type...

journal article 2018

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Shape optimization and optimal control for transient heat conduction problems using an isogeometric approach

Wang, Z. (author), Turteltaub, S.R. (author), Abdalla, M.M. (author)

This work is concerned with the development of a framework to solve shape optimization problems for transient heat conduction problems within the context of isogeometric analysis (IGA). A general objective functional is used to accommodate both shape optimization and passive control problems under transient conditions. An adjoint sensitivity...

journal article 2017

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Normalization approaches for the descent search direction in isogeometric shape optimization

Wang, Zhen Pei (author), Abdalla, M.M. (author), Turteltaub, S.R. (author)

In isogeometric shape optimization, the use of the search direction directly predicted from the discrete shape gradient makes the optimization history strongly dependent on the discretization. This discretization-dependency can affect the convergence and may lead the optimization process into a sub-optimal solution. The source of this...

journal article 2017

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Generalized grain cluster method for multiscale response of multiphase materials

Yadegari, S. (author), Turteltaub, S.R. (author), Suiker, A.S.J. (author)

A multiscale approach termed the generalized grain cluster method (GGCM) is presented, which can be applied for the prediction of the macroscopic behavior of an aggregate of single crystal grains composing a multiphase material. The GGCM is based on the minimization of a functional that depends on the microscopic deformation gradients in the...

journal article 2015