Bending and wrinkling of composite fiber preforms and prepregs. A review and new developments in the draping simulations

Boisse, Philippe; Colmars, Julien; Hamila, Nahiene; Naouar, Naïm; Steer, Q.

doi:10.1016/j.compositesb.2017.12.061

Cited by 177 publications

(96 citation statements)

References 136 publications

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“…In the case of thick yarns and dense structure, the model should either be replaced by a two-scale model, resolving the contact knots in all 3-dimensional details, as in works of S. Lomov, or extended to the bending of yarns at the contact points, as in works of Damien Durville [4,[22][23][24][25] and a simplification in a form of a changing gap-factor can be introduced, imitating the yarn thickness reduction on the contact nodes during the stretching, as in the last example.…”

Section: Discussionmentioning

confidence: 99%

Extension of One-Dimensional Models for Hyperelastic String Structures under Coulomb Friction with Adhesion

2018

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A stretching behavior of knitted and woven textiles is modeled. In our work, the yarns are modeled as one-dimensional hyperelastic strings with frictional contact. Capstan law known for Coulomb's friction of yarns is extended to an additional adhesion due to gluing of filaments on the yarn surface or some chemical reaction. Two-step Newton's method is applied for the solution of the large stretching with sliding evolution in the contact nodes. The approach is illustrated on a hysteresis of knitted textile and on the force-strain curve for a woven pattern and both compared with experimental effective curves.

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Section: Discussionmentioning

confidence: 99%

Extension of One-Dimensional Models for Hyperelastic String Structures under Coulomb Friction with Adhesion

2018

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“…amplitude A, wavelength L, laminate thickness t, maximum fiber misalignment angle θ max , environmental conditions (room temperature or hot-wet), layup and the position of wavy layers within the laminate engineers aim to expand the permissible margin of safety by assessing the effect on stiffness and strength of those production effects, i.e. fiber waviness, porosity, delamination etc.. Additionally, they aim to reduce, or in the best case avoid, them on the process side, increasingly with the help of process simulations such as in [16][17][18].…”

Section: Occurrence and Assessment Of Fiber Wavinessmentioning

confidence: 99%

Numerical and experimental investigation of out-of-plane fiber waviness on the mechanical properties of composite materials

et al. 2020

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The limited capability to predict material failure in composite materials and specifically in wavy composite layers has led to high margins of safety for the design of composite structures. Thus, the full lightweight potential of this class of materials is left unused. To understand the complex failure behavior of composite materials containing out-of-plane fiber waviness under compressive and tensile loading, a non-linear 2D material model was implemented in ABAQUS and validated with extensive experimental test data from compression and tensile tests. Each test was recorded by a stereo camera system for digital image correlation to resolve damage initiation and propagation in detail. This study has shown excellent agreement of numerical simulations with experimental data. In a virtual testing approach various parameters, i.e. amplitude, wavelength and laminate thickness, have been studied. It was found that the failure mode changed from delamination to kink shear band formation with increasing laminate thickness. The wavelength has shown minor influences compared to amplitude and laminate thickness.

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“…Towards this goal, design and production engineers aim to expand the permissible margin of safety by assessing the effect on stiffness and strength of those production effects (i.e., fiber waviness, porosity, delamination, etc.). Additionally, they aim to reduce or, in the best case, avoid them on the process side, increasingly with the help of finite element based process simulations, such as in [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Origin and Classification of Out-of-Plane Fiber Waviness in Composite Materials—A Review

2020

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Out-of-plane fiber waviness, also referred to as wrinkling, is considered one of the most significant effects that occur in composite materials. It significantly affects mechanical properties, such as stiffness, strength and fatigue and; therefore, dramatically reduces the load-carrying capacity of the material. Fiber waviness is inherent to various manufacturing processes of fiber-reinforced composite parts. They cannot be completely avoided and thus have to be tolerated and considered as an integral part of the structure. Because of this influenceable but in many cases unavoidable nature of fiber waviness, it might be more appropriate to consider fiber waviness as effects or features rather than defects. Hence, it is important to understand the impact of different process parameters on the formation of fiber waviness in order to reduce or, in the best case, completely avoid them as early as possible in the product and process development phases. Mostly depending on the chosen geometry of the part and the specific manufacturing process used, different types of fiber waviness result. In this study, various types of waviness are investigated and a classification scheme is developed for categorization purposes. Numerous mechanisms of wrinkling were analyzed, leading to several recommendations to prevent wrinkle formation, not only during composite processing, but also at an earlier design stage, where generally several influence factors are defined.

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Bending and wrinkling of composite fiber preforms and prepregs. A review and new developments in the draping simulations

Cited by 177 publications

References 136 publications

Extension of One-Dimensional Models for Hyperelastic String Structures under Coulomb Friction with Adhesion

Extension of One-Dimensional Models for Hyperelastic String Structures under Coulomb Friction with Adhesion

Numerical and experimental investigation of out-of-plane fiber waviness on the mechanical properties of composite materials

Mechanisms of Origin and Classification of Out-of-Plane Fiber Waviness in Composite Materials—A Review

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