Prediction of fracture and damage in micro/nano coating systems using cohesive zone elements

Materials Research Letters

Rueß

et al. 2017

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We show here, based on VAlN, TiAlN and the related oxynitrides, that the (brittle) fracture and elastic properties may be consistently modelled from quantum-to continuum mechanics using micromechanical testing to link both scales. The measured elastic moduli match closely with those predicted by density functional theory calculations. Good agreement was also observed between the microcantilever bending experiments and cohesive-zone-finite element modelling. These scale-bridging data serve as a baseline for future improvements of the fracture toughness of these coating systems based on microstructure and coating architecture optimization. IMPACT STATEMENTWe link ab initio calculations with finite element modelling using micro-mechanical testing to consistently model the elastic and fracture behaviour of transition metal nitrides and oxynitrides. ARTICLE HISTORY

Section: Finite Element Simulationmentioning

confidence: 99%

Section: Finite Element Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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From quantum to continuum mechanics: studying the fracture toughness of transition metal nitrides and oxynitrides

Gibson

Materials Research Letters

Rueß

et al. 2017

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“…Application of interface elements to study interface damage usually generates several numerical challenges . Among these are sharp snap‐back problems, the proper choice of number and location of integration points as well as the computation of the material tangent . Over the years, several remedies were proposed to overcome these problems .…”

Section: Introductionmentioning

confidence: 99%

Locking‐free interface failure modeling by a cohesive discontinuous Galerkin method for matching and nonmatching meshes

Bayat

Numerical Meth Engineering

Brepols

et al. 2020

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Summary In this work, modeling of brittle failure of the interface for a linear elastic material is presented. The idea is to integrate a novel extrinsic cohesive zone model into the incomplete interior penalty Galerkin variant of the discontinuous Galerkin (DG) method. As a result, the initial stiffness in the prefailure regime is omitted without having to remesh the crack path during the crack propagation. The interface model is used in combination with different discretization techniques, including matching and nonmatching meshes. This is possible due to the DG method's weak continuity constraint. Moreover, the locking problem in the bulk is cured by the application of a reduced Gaussian integration scheme on the boundary terms. The performance of the new cohesive discontinuous Galerkin elements with different integration schemes is compared with one of the standard intrinsic cohesive models. Due to the elimination of locking, crack initiation at the interface can be realistically displayed.

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Ceramic Matrix Composites (CMC) overcome limitations associated with classical technical ceramics e.g. The fiber bridging effect, resulting from the weak interface bond of matrix and reinforcement, is governed by the use of cohesive zone (CZ) elements [2]. Their high temperature stability and low weight makes them attractive for use in various fields, especially aerospace industry, where they improve engine efficiency compared to metal components.

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mentioning

confidence: 99%

Development of a novel damage approach on the microstructure for modeling woven ceramic matrix composites

Reuvers

Proc Appl Math and Mech

Brepols

et al. 2019

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Ceramic Matrix Composites (CMC) overcome limitations associated with classical technical ceramics e.g. low fracture toughness and brittle failure under mechanical or thermomechanical loading [1]. Their high temperature stability and low weight makes them attractive for use in various fields, especially aerospace industry, where they improve engine efficiency compared to metal components. However current CMCs lack well established material property design databases for a reliable use in critical aerospace structures. Demonstrating the durability of this relatively new class of materials is the challenge to face and therefore the failure mechanisms need to be investigated further. This contribution deals with the successive development of a woven representative volume element (RVE) for arbitrary CMCs. In contrast to previously developed continuum mechanical or laminate theory based modeling approaches, the introduced model combines various damage formulations. The fiber bridging effect, resulting from the weak interface bond of matrix and reinforcement, is governed by the use of cohesive zone (CZ) elements [2]. Whereas the matrix damage is represented using a continuum mechanical approach [3].