Model for Predicting the Mechanical Properties of Composites at Elevated Temperatures

Springer, George Ś.

doi:10.1177/073168448400300105

Cited by 45 publications

(14 citation statements)

References 3 publications

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“…Dutta and Hui (2000) related the current elastic modulus to the current temperature as well as the current mass density of the composite. The early model by Springer (1984) related current material properties to the loss of mass density. In Bai et al (2008), who considered different material states in different temperature ranges, a kinetic theory was employed to model the degradations of stiffness, viscosity, and the coefficient of thermal expansion.…”

Section: Temperature Distributionmentioning

confidence: 99%

Structural integrity of polymer matrix composite panels in fire

2012

Failure Mechanisms in Polymer Matrix Composites

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Section: Temperature Distributionmentioning

confidence: 99%

Structural integrity of polymer matrix composite panels in fire

2012

Failure Mechanisms in Polymer Matrix Composites

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“…Recent studies 7–11 have shown that composite materials significantly degrade when subjected to even relatively low levels of thermal loading. Efforts have been made in order to provide experimental and analytical techniques that could be used to predict when failure occurs in composite materials due to elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

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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“…Detailed degradation mechanisms for environmental exposure are studied by Tsai [18] and Springer [19][20], but it is apparent that most of the models predicting temperature and moisture effects are based on empirical formulations which badly need test data. Moreover, the existing moisture and temperature induced degradation data are mostly for single fiber composites and property like Poisson's ratio is rarely studied under such influence.…”

Section: Introductionmentioning

confidence: 99%

Moisture and Temperature Induced Degradation in Tensile Properties of Kevlar-Graphite/Epoxy Hybrid Composites

Haque

Mahmood

Walker

et al. 1991

Journal of Reinforced Plastics and Composites

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This paper presents results of a comparative study of the effects of moisture and temperature on tensile properties of Kevlar 49/epoxy, graphite/epoxy, single fiber and Kevlar 49-graphite/epoxy hybrid composites. The work reported here shows variations in tensile strength, elastic modulus and Poisson's ratio with changes in the hygrothermal conditions. A temperature range of 23°C to 150°C was considered for both dry and wet specimens exposed to moisture for 200 days. Moisture was introduced into the specimen by immersion in distilled water. Effects of the kind of outer fiber of the same hybrid system was also studied for better understanding of the behavior of hybrid composites. Variation in the tensile modulus determined by various test methods is also reported.The results indicate that moisture and temperature degrade the tensile strength of hybrid and single fiber composites. The tensile modulus of Kevlar 49-graphite/epoxy is comparatively higher than that of Kevlar 49/epoxy. The degradation of the tensile modulus is mostly temperature dependent. The presence of moisture either increases or decreases the tensile modulus depending upon the laminate and exposure conditions. Poisson's ratio in general appears to increase with temperature. In the presence of moisture the Poisson's ratio further increases between the temperatures of 45°C to 150°C.

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Model for Predicting the Mechanical Properties of Composites at Elevated Temperatures

Cited by 45 publications

References 3 publications

Structural integrity of polymer matrix composite panels in fire

Structural integrity of polymer matrix composite panels in fire

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

Moisture and Temperature Induced Degradation in Tensile Properties of Kevlar-Graphite/Epoxy Hybrid Composites

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