Study on the possibility of increasing the maximum allowable stresses in fibre-reinforced plastics

Sánchez-Heres, Luis Felipe; Ringsberg, Jonas W.; Johnson, Erland

doi:10.1177/0021998312452763

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…There is a need to clearly define failure of composites. From comparative studies between deterministic and probabilistic analyses of cross-ply laminates under tension Sánchez-Heres et al [10] concluded that an increased understanding is required regarding the effects of progressive matrix cracking in order to reach a safer structure.…”

Section: Fig 1 Damage Developmentmentioning

confidence: 99%

Models for Intralaminar Damage and Failure of Fiber Composites - A Review

Rohwer

2016

FU Mech Eng

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In order to fully exploit the potential of structures made from fiber composites, designers need to know how damage occurs and develops and under what conditions the structure finally fails. Anisotropy and inhomogeneity cause a rather complex process of damage development which may be one reason for an exceptionally large number of existing models. This paper intends to provide an overview over those models and give some hints about current developments. As such it is an updated version of a recent publication [1]. The survey is limited to laminates from unidirectional layers out of straight continuous fiber polymer composites under quasi-static loading. Furthermore, focus is laid on intralaminar damage.Many failure models smear out the inhomogeneity between fibers and the matrix. Simply limiting each stress component separately can lead to surprisingly good results as documented in the first World-Wide Failure Exercise. Interpolation criteria consider mutual influence of normal and shear stresses, predominantly through a quadratic failure condition. Traditionally one distinguishes between interpolation criteria and physically based ones. As an important physical effect the difference between fiber failure and inter-fiber failure is considered. Furthermore, stress invariants are taken as a basis, increased shear strength under compression is accounted for, and characteristic failure modes are captured. Fibers and the matrix material are characterized by a large disparity in stiffness and strength. Micromechanical models consider this inhomogeneity but suffer from the difficulty to determine relevant material properties. Compressive strength in fiber direction has attracted special attention. However, the role of kink band formation, which is observed in the failure process, seems to be not yet fully understood.In summary it must be concluded that despite the tremendous effort which has been put into the model development the damage and failure simulation of fiber composites are not in a fully satisfying state. That is partly due to lack of accurate and reliable test results.

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Section: Fig 1 Damage Developmentmentioning

confidence: 99%

Models for Intralaminar Damage and Failure of Fiber Composites - A Review

Rohwer

2016

FU Mech Eng

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“…There is a need to clearly define failure of composites. From studies with crossply laminates, Sa´nchez-Heres et al 9 found out that an increased understanding is required regarding the effects of matrix cracks, and therefore the maximum allowable crack density, in order to reach a safer structure.…”

Section: Introductionmentioning

confidence: 99%

Predicting fiber composite damage and failure

Rohwer¹

2014

Journal of Composite Materials

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Considerable effort has been put into the development of models describing damage and failure of fiber composites. This paper aims at providing an overview of models for intralaminate fracture of continuous fiber-reinforced polymer composites under quasi-static load. The models are grouped into homogeneous ones, those with some effect of inhomogeneity between fibers and the matrix, and fully inhomogeneous ones. Even a world-wide competition was not able to decide for the one and only homogeneous model. Accounting for the inhomogeneity between fibers and the matrix allows being more close to the real behavior on the account of higher computational effort. They suffer, however, from the difficulty to gather reliable material data. In summary, it must be concluded that a fully satisfying solution is not yet available. Consequently, for the time being, a real test remains the authentic way to secure structural strength.

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