Short-fibre thermoset composites

Caprino, G.

doi:10.1533/9781855738577.3.269

Cited by 5 publications

(2 citation statements)

References 59 publications

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“…Consequently, the specimens are exceptionally sensitive to heat because the specimens of GRP in CSM form are matrix dominated composite laminates and its mechanical properties reduce more dramatically at 75 °C compared to the room temperature and 50 °C. The results demonstrate that the adopted stress level has strong influences on the trend confirming the work of Caprino 19 . Alternatively, the higher the ratio of the maximum applied stress σ max to the composite strength, the larger is the modulus reduction for a given number of cycles resulting less fatigue life.…”

Section: Discussionsupporting

confidence: 68%

A fatigue life prediction model for Chopped Strand Mat GRP at elevated temperatures

Sul

Prusty

Pan

2010

Fatigue Fract Eng Mat Struct

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A B S T R A C T Experimental and analytical investigations for the low cycle-fatigue life prediction ofGlass-Reinforced Polymer (GRP) in Chopped Strand Mat (CSM) form are studied. Based on the theories of modulus degradation and residual strength degradation, a novel model is proposed for the prediction of progressive stiffness loss in terms of tension-tension fatigue load and the number of cycles. The proposed model involves various loadings and environmental variables, which makes the reliable predictions suitable for structural analysts. Experiments were carried out at room and elevated temperatures to evaluate the validity of the proposed prediction model for the characterisation of temperature-dependent behaviour in fatigue. Predictions using the proposed model are in good agreement with the experiments that justify the use of the model to determine the extent of low-cycle fatigue damage accumulation in GRP-CSM at room and elevated temperatures.Keywords fatigue life prediction; Glass fibres; rate dependence; short fibre composite; temperature dependence. I N T R O D U C T I O NA wide range of structures or components are commonly manufactured using fibre-reinforced polymer composites. The requirements that are not just to enhance operational performance but also to reduce the overall cost have caused widespread use of GRP in CSM form particularly in the maritime industry. It is common to get temperatures in excess of 65 • C on boats with white gel coats, while temperatures up to 85 • C have been measured with red gel coats, and well over 95 • C with black gel coats in the tropics. 1 Despite the fact that gel goats are commonly used to attempt for temperature control in composite bodies, mechanical properties of CSM-GRP at elevated temperature have not been thoroughly investigated. There are essentially three types of fatigue beCorrespondence: G. Prusty. haviour prediction model for composites namely, (a) theories based on conventional S-N curves, (b) theories based on changes in elastic modulus and residual strength, and (c) theories based on actual damage mechanisms. Most of the prediction models developed from these theories have been based on residual strength or residual stiffness. Whitney 1 illustrated a residual strength model for both tensile and compressive strength degradation as competing failure modes. An equation for strength degradation model was developed based on a three parameter Power Law. The suggested prediction model is not able to account for the failure mode with delamination. Hence, if delamination played a significant role in the failure mechanism of a particular composite material, the model would be definitely inadequate to get a reliable prediction. Rotem and Nelson 2 proposed a prediction model that relates the residual strength of composite with a temperature-shifting factor by assuming constant residual

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Section: Discussionsupporting

confidence: 68%

A fatigue life prediction model for Chopped Strand Mat GRP at elevated temperatures

Sul

Prusty

Pan

2010

Fatigue Fract Eng Mat Struct

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“…Caprino [54] attributed the difference in the fibre length threshold to both the dissimilar loading modes (T-C vs T-T) and the specific matrices used (polyester vs epoxy). Generally, in static tension, mechanical behaviour is governed by the reinforcement, even though the length of the fibres may be short (up to 3 mm) [54,55,56,57]. Figure 16 shows how the CF aspect ratio influences the fatigue properties of carbon short-fibre reinforced plastics (CSFRP).…”

Section: Short Fibre Cfrp Composites In Fatiguementioning

confidence: 99%

The fatigue of carbon fibre reinforced plastics - A review

Alam

Mamalis

Robert

et al. 2019

Composites Part B: Engineering

256

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Engineering structures are often subjected to the conditions of cyclic-loading, which onsets material fatigue, detrimentally affecting the service-life and damage tolerance of components and joints. Carbon fibre reinforced plastics (CFRP) are high-strength, lowweight composites that are gaining ubiquity in place of metals and glass fibre reinforced plastics (GFRP) not only due to their outstanding strength-to-weight properties, but also because carbon fibres are relatively inert to environmental degradation and as such, show potential as corrosion resistant materials. The effects of cyclic loading on the fatigue of CFRP are detailed in several papers. As such, collating research on CFRP fatigue into a single document is a worthwhile exercise, as it will benefit the engineering-readership interested in designing fatigue resistant structures and components using CFRP. This review article aims to provide the most relevant and up-to-date information on the fatigue of CFRP. The review focuses in particular on defining fatigue and the mechanics of cyclically-loaded composites, elucidating the fatigue response and fatigue properties of CFRP in different forms, discussing the importance of environmental factors on the fatigue performance and service-life, and summarising the different approaches taken to modelling fatigue in CFRP.

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Problems in short-fiber composites and analysis of chopped fiber-reinforced materials

Monfared

2020

New Materials in Civil Engineering

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Short-fibre thermoset composites

Cited by 5 publications

References 59 publications

A fatigue life prediction model for Chopped Strand Mat GRP at elevated temperatures

A fatigue life prediction model for Chopped Strand Mat GRP at elevated temperatures

The fatigue of carbon fibre reinforced plastics - A review

Problems in short-fiber composites and analysis of chopped fiber-reinforced materials

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