First pseudo-grain failure model for inelastic composites with misaligned short fibers

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tDamage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (lCT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, matrix microcracks appear and grow regardless the RH contents. For RH = 100%, these microcracks are also accompanied by many matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.

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“…composite microstructure, damage mechanisms, polymer rheology, hygrothermal conditions, loading level and paths, etc. [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Arif

Meraghni

Chemisky

et al. 2014

Composites Part B: Engineering

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“…Also relying on a two-step homogenization procedure, Kammoun et al [17] recently proposed an alternative model for brittle failure called First Pseudo-Grain Failure (FPGF) by analogy with the "First Ply Failure" concept used for laminates .…”

Section: Introductionmentioning

confidence: 99%

Micromechanical modeling of the progressive failure in short glass–fiber reinforced thermoplastics – First Pseudo-Grain Damage model

Kammoun

Doghri

Brassart

et al. 2015

Composites Part A: Applied Science and Manufacturing

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“…Fibre configuration is extracted from work by Kammoun et al [8] (E F = 76 GPa, distributed orientations with preferential orientation in the injection flow direction). In the present implementation, the fibre distribution is modelled using 10 fibre media with angles of orientation varying from 0 to 90 • , by step of 10 • , with respect to the injection flow direction and a suitable volume fraction is associated to each fibre media, as shown in Fig.…”

Section: Example Of Applicationmentioning

confidence: 99%

A viscoelastic-viscoplastic model for short-fibre reinforced polymers with complex fibre orientations

Nciri

Notta‐Cuvier

Lauro

et al. 2015

EPJ Web of Conferences

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Abstract. This paper presents an innovative approach for the modelling of viscous behaviour of short-fibre reinforced composites (SFRC) with complex distributions of fibre orientations and for a wide range of strain rates. As an alternative to more complex homogenisation methods, the model is based on an additive decomposition of the state potential for the computation of composite's macroscopic behaviour. Thus, the composite material is seen as the assembly of a matrix medium and several linear elastic fibre media. The division of short fibres into several families means that complex distributions of orientation or random orientation can be easily modelled. The matrix behaviour is strain-rate sensitive, i.e. viscoelastic and/or viscoplastic. Viscoelastic constitutive laws are based on a generalised linear Maxwell model and the modelling of the viscoplasticity is based on an overstress approach. The model is tested for the case of a polypropylene reinforced with short-glass fibres with distributed orientations and subjected to uniaxial tensile tests, in different loading directions and under different strain rates. Results demonstrate the efficiency of the model over a wide range of strain rates.

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First pseudo-grain failure model for inelastic composites with misaligned short fibers

Cited by 78 publications

References 35 publications

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Micromechanical modeling of the progressive failure in short glass–fiber reinforced thermoplastics – First Pseudo-Grain Damage model

A viscoelastic-viscoplastic model for short-fibre reinforced polymers with complex fibre orientations

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