Multiscale damage modelling of 3D woven composites under static and impact loads (original) (raw)
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Damage modeling and characterization of a three-dimensional woven composite
1999
The characterization and modeling of the inplane damage behavior of a threedimensional woven composite are conducted with the use of the Mesoscale Composite Damage Theory, developed by Ladevèze. A first analysis of the composite fabric provides the main geometrical properties that can affect the mechanical behavior. A model previously established for aeronautical carbon/epoxy laminates is applied in a simplified version. It assumes an elastic and brittle behavior in the directions of the fibers, and degradation mechanisms like matrix micro-cracking and fiber debonding under a shear stress state. The model utilizes two experimental laws to be identified for the description of damage and inelastic strains. Then, the experimental procedure is presented by means of tensile tests on two relevant kinds of samples. The identification of the elastic, failure, damage and inelastic properties is performed. The comparison between complementary experiments and simulation shows a good fitting for small strains.
Numerical predictions of damage initiation in 3D woven composites under various loading conditions
The strength of three-dimensional woven composites is determined by their reinforcement configuration and the strength of their constituents. In the present work, we consider several criteria to predict initiation of damage in matrix of carbon/epoxy composites subjected to uniform temperature drop and uniaxial tension. The matrix is modeled as the isotropic material with temperature dependence of elastic properties and thermal expansion coefficient. The dilatational strain energy density, the parabolic stress and the Drucker-Prager yield criteria are implemented as a custom subroutine in commercial finite element software package MSC Marc/Mentat. The predicted damage locations are compared with the computed microtomography observations.
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences, 2016
This paper is concerned with predicting the progressive damage and failure of multi-layered hybrid textile composites subjected to uniaxial tensile loading, using a novel two-scale computational mechanics framework. These composites include three-dimensional woven textile composites (3DWTCs) with glass, carbon and Kevlar fibre tows. Progressive damage and failure of 3DWTCs at different length scales are captured in the present model by using a macroscale finite-element (FE) analysis at the representative unit cell (RUC) level, while a closed-form micromechanics analysis is implemented simultaneously at the subscale level using material properties of the constituents (fibre and matrix) as input. The N-layers concentric cylinder (NCYL) model (Zhang and Waas 2014 Acta Mech. 225, 1391-1417; Patel et al. submitted Acta Mech.) to compute local stress, srain and displacement fields in the fibre and matrix is used at the subscale. The 2-CYL fibre-matrix concentric cylinder model is extended...
Durability of a 3D woven composite assisted by finite element multi-scale modelling
HAL (Le Centre pour la Communication Scientifique Directe), 2012
The textile composite studied is a 3D woven composite. A unit cell is defined by using microscopic examinations of the microstructure. A multiscale approach assisted by the finite element method is performed in order to estimate the effective properties of the composite and then to access to local stress field. This approach allows the determination of the kind of load to which warp yarns are subjected. Moreover, detailed analysis of damaged model using different configurations of broken yarns are treated. The evolution of the stress concentration coefficient highlight the load transfers due to consecutive yarn breaks.
Composite Structures, 2016
Damage initiation and evolution of three-dimensional(3D) orthogonal woven carbon fibre composite (3DOWC) is investigated experimentally and numerically. Meso-scale homogenisation of the representative volume element (RVE) is utilised to predict the elastic properties, simulate damage initiation and evolution when loaded in tension. The effect of intrayarnstransverse cracking and shear diffused damage on the in-plane transverse modulus and shear modulus is investigated while one failure criterion is introduced to simulate the matrix damage. The proposed model is based on two major assumptions. First, the effect of the binder yarns, on the in-plane properties, is neglected, so the 3DOWC unit cell can be approximated as a (0 o /90 o ) cross-ply laminate. Second, a micro-mechanics based damage approach is used at the meso-scale, so damage indicators can be correlated, explicitly, to the density of cracks within the material. Results from the simulated RVE are validated against experimental results along the warp (0 o direction) and weft (90 o direction). This approach paves the road for more predictive models as damage evolution laws are obtained from micro mechanical considerations and rely on few well-defined material parameters. This largely differs from classical damage mechanics approaches in which the evolution law is obtained by retrofitting experimental observations.
Journal of Composite Materials, 2013
A meso-scale finite element model for static damage in textile composites was established. The impregnated yarn is taken as homogeneous and transverse isotropic material, whose mechanical properties are calculated using Chamis’ equations. The damage modes are determined by using the Tsai-Wu criterion and additional criteria. The Murakami damage tensor is used to calculate the post-damage stiffness matrix. The model has been validated using plain weave and twill weave carbon–epoxy composites. The initiation of inter-fiber matrix cracks and fiber rupture were analyzed using this meso-FE model.
Evaluation of damage initiation models for 3D-woven fibre composites
2019
Three dimensional (3D) fibre-reinforced composites have shown weight efficient strength and stiffness characteristics as well as promising energy absorption capabilities. In the considered class of 3D-reinforcement, vertical and horizontal weft yarns interlace warp yarns. The through-thickness reinforcements suppress delamination and allow for stable and progressive damage growth in a quasi-ductile manner. With the ultimate goal of developing a homogenised computational model to predict how the material will deform and eventually fail under loading, this work proposes candidates for failure initiation criteria. The criteria are evaluated numerically for tensile, compressive and shear tests. The extension of the LaRC05 stress based failure criteria to this class of 3D-woven composites is one possibility. This however, presents a number of challenges which are discussed. These challenges are related to the relative high stiffness in all directions, which produce excessively high shear...
Modeling Damage Modes in 3-D Woven Armor Composite Systems
2006
In this paper a computationally intensive, multi-scale model exhibiting progressive damage in a 3D-woven composite is considered. It is based on evolving some fundamental damage modes in a representative volume element (RVE) of the composite's actual woven architecture. The evolving damage modes affect the local stresses in the composite micro-structure and eventually the overall stresses in the composite. This effect is considered in the RVE via a transformation field analysis (TFA). Since the model is computationally intensive, its numerical requirements in modeling the local microstructure, e.g. the mesh size, are to be understood before it can successfully be used in armor lay-up design studies or in conjunction with Lagrangian impact codes such as DYNA3D. This is a convergence issue which has not been studied before in RVE-TFA theories which use separate meshes at local and global levels. This paper examines the effect of the local micro-mesh size on modeling the weave-level damage progression in the 3Dwoven composites.
Novel Multi-scale Modeling of Woven Fabric Composites for use in Impact Studies
2008
A novel approach to the multi scale modeling of the impact of woven fabrics using LS-DYNA ® has been presented. This new technique entitled 'Hybrid Element Analysis (HEA)' incorporates the use of different finite elements at both a single and multiple level of modeling. A yarn level resolution is maintained around the impact zone or local region, while a homogenized resolution has been used for the far field or global region. The central patch of yarn level resolution uses a combination of solid and shell elements. A new method for modeling individual yarns using shell elements is discussed, which more accurately captures the geometrical contours of the yarn cross section. The surrounding homogenized zone uses shell elements. Interfaces using various types of tie-constraints are created between the different finite elements at the various scales of modeling. The acoustic impedances have been matched across the interfaces. A systematic approach is presented to determine the geometric and material parameters of the homogenized zone. The HEA approach maintains the accuracy of using a fabric model comprised entirely with yarn level resolution utilizing solid elements, but at a fraction of the computational expense. This enables the finite element simulation of multi layered fabric systems with very large domains, which was previously very difficult because of the impractical computational requirements of such an exceedingly large model. Compared to previous numerical multi-scale models, the finite element model using the HEA approach presented in this paper more accurately captures the entire impact event at a lower computational expense, making it a very useful tool for future studies.