Fibre-epoxy composites at low temperatures

Hartwig, G.; Knaak, S.

doi:10.1016/0011-2275(84)90083-3

Cited by 106 publications

(31 citation statements)

References 5 publications

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“…The damage created in the resin could affect these stresses more than do the tensile stresses, controlled basically by the fibres that are less affected by temperature. Finally, at low temperature the matrix becomes brittle and does not allow relaxation of residual stress or stress concentrations [33].…”

Section: Analysis Of Mechanical Propertiesmentioning

confidence: 99%

Analysis of the dynamic flexural behaviour of composite beams at low temperature

Sánchez-Sáez

Barbero

2007

Composites Science and Technology

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In this study, the dynamic flexural behaviour at low temperatures of beams of three carbon/epoxy laminates is evaluated, analysing the influence of temperature on the mechanical strength, stiffness and absorbed energy until failure. Three point bending tests were per formed under dynamic conditions at three different temperatures (20°C, 60°C and 150°C), and the results were compared with those found under static conditions at the same temperatures. Both the mechanical strength and the absorbed energy decreased when the tem perature diminished in all the laminates. No significant influence of temperature was noted on the effective flexural modulus. Two ana lytical models, using the classical laminated theory and the first order shear deformation laminate theory, and a numerical model were used to analyse the experimental results of the tests. The models allowed to ensure the use of the equations, which do not consider inertia forces, to calculate the test parameters, and they provided the specimen support span to neglect shear effects. They served also to deter mine the origin of the noise present in the load measured in the dynamic tests.

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Section: Analysis Of Mechanical Propertiesmentioning

confidence: 99%

Analysis of the dynamic flexural behaviour of composite beams at low temperature

Sánchez-Sáez

Barbero

2007

Composites Science and Technology

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“…They suggest this can be explained by a better fibre-matrix adhesion at lower temperatures, which is supported by fractographic evidence [125].The lowered resistance to delamination growth at 4K is explained by the freezing of the molecular motion of the epoxy resin, which prevents stress relaxation. In addition Shindo et al refer to the work of Hartwig and Knaak [133], showing that 4K thermal residual stresses will arise at the fibre-matrix interface and that the matrix will be embrittled. Shindo et al suggest these effects contribute to the lower resistance to delamination growth at 4K, when compared to 77K.…”

Section: Effect Of Environmental and Testing Conditionsmentioning

confidence: 99%

Methods for the prediction of fatigue delamination growth in composites and adhesive bonds – A critical review

Pascoe

Alderliesten

Benedictus

2013

Engineering Fracture Mechanics

228

145

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An overview is given of the development of methods for the prediction of fatigue driven delamination growth over the past 40 years. Four categories of methods are identified: stress/strain-based models, fracture mechanics based models, cohesive-zone models, and models using the extended finite element method. It is highlighted that most models are phenomenological, based on the observed macro-scale behaviour of test specimens. It is suggested that a more physics based approach, focusing on elucidating the mechanisms involved, is needed to come to a full understanding of the problem of delamination growth.

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“…3a, where the final failure strains reduce with reduction of temperature. This implied that there is a reduction of ductility and increase in brittleness of the composites at low temperature (Hartwig and Knaak 1984). Kim et al (2007) attributed such increase in brittleness at low temperatures predominantly to the fibers, which increased rapidly within a temperature range from RT to −50 • C. On the other hand, the increase in the laminate strength and stiffness is attributed to the strengthening of the matrix.…”

Section: Tension Test Resultsmentioning

confidence: 99%

Durability and failure mechanics of woven carbon composites under repeated impact loading in Arctic conditions

Castellanos

Prabhakar

2018

Multiscale and Multidiscip. Model. Exp. and Des.

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The rise in demand and interest in Arctic exploration has brought new challenges with regard to the mechanical behavior of lightweight offshore structures with fiber-reinforced composite materials. These materials experience drastic changes and degradation in their macro-and microstructures when exposed to seawater and cold temperatures during service. Therefore, it is critical to have a detailed comprehension of the mechanical behavior and failure mechanisms of these materials in Arctic conditions. Within the scope of the current study, low-velocity repeated impact behavior of carbon fiber/vinyl ester composites in Arctic temperature (−50 • C) is investigated. Impact responses, such as the contact force, displacement and absorbed energy, at four impact energies of 20, 25, 30 and 35 J under repeated impact loading until perforation are determined at −50 • C and compared against those at room temperature (25 • C). The number of impacts required for perforation, the rate of reduction in impact force, the degree of damage and the failure mechanisms change significantly with varying impact energies and in situ ambient temperatures, and they are elucidated in detail in this paper.

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Fibre-epoxy composites at low temperatures

Cited by 106 publications

References 5 publications

Analysis of the dynamic flexural behaviour of composite beams at low temperature

Analysis of the dynamic flexural behaviour of composite beams at low temperature

Methods for the prediction of fatigue delamination growth in composites and adhesive bonds – A critical review

Durability and failure mechanics of woven carbon composites under repeated impact loading in Arctic conditions

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