An assessment of mechanical behavior and fractography study of glass/epoxy composites at different temperatures and loading speeds

Sethi, Sanghamitra; Ray, Bankim Chandra

doi:10.1016/j.matdes.2014.07.017

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…The experimental results revealed that the material performance reduces above GTT. The results are comparable with the observation made by Sethi et al [10,12] and Dasari et al [11].…”

Section: Flexural Strength Of Glass/epoxy Composite Tested At 1 Mm/mi...supporting

confidence: 92%

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Flexural response of glass/epoxy composites to thermal shocks and conditioning environment in varying loading rate

Shrivastava

Singh

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The structural integrity of composites faces severe challenge in the form of environmental extremes. Therefore, its performance in those cases were of great interest. In the present work, flexural strength of glass/epoxy composites were analysed in the environment of thermal shock generated by cryogenic exposure as well by thermal conditioning. Four cases were chosen, room temperature (RT), cryogenic conditioning (LN), thermal conditioning below (BG) and above glass transition temperature (AG). The exposure time for all the environments was kept constant at 24 hours. These responses are investigated with two sets of loading rates (i) 1 mm/minute and (ii) 10 mm/min. The experimental results indicate that; all three scenarios deeply impact the flexural response of the specimen. The first set experiences changes in flexural strength, strain, and chord modulus by (2.75, -8.52, 11.32), (21.36, 39.75, -6.47), (-35.8, -11.37, -22.94) % with LN, BG and AG condition respectively. Moreover, with high rate of loading these responses change by (-23.89, -28.41, -5.17), (-37.45, -43.56, -1.86), (-19.4, -27.46, 16.37) % respectively. The prolonged exposure indicates a strain hardening phenomenon in LN specimen, which improves the flexural strength with a 1 mm/min loading rate. However, this plasticization of the specimen was unable to bear the load at an elevated rate of loading, and therefore a loss in all the properties is seen with a 10 mm/min loading rate. Therefore, it is anticipated that the properties will further deteriorate with a higher rate of loadings.

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“…The experimental results revealed that the material performance reduces above GTT. The results are comparable with the observation made by Sethi et al [10,12] and Dasari et al [11].…”

Section: Flexural Strength Of Glass/epoxy Composite Tested At 1 Mm/mi...supporting

confidence: 92%

“…The increase in conditioning time provides more relaxation time to the specimen, and therefore flexural performance changes significantly less. Sethi et al [12] reported enhancement in SBS strength of glass/epoxy composite by ~30% at -50°C but at 50°C, it improves only by ~10%.…”

Section: Introductionmentioning

confidence: 99%

Flexural response of glass/epoxy composites to thermal shocks and conditioning environment in varying loading rate

Shrivastava

Singh

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Still, no fibre pull-out was observed at the interface. However, the presence of an extensive matrix surrounding the fibre indicates a lower impact strength, due to the cleavage failure at the interface 24 as indicated in Figure 7(c). The exceeding energy is not sufficient for the crack propagation, and hence resulted in the form of pores (Figure 7c), termed as pinning of the crack 25 at the crack’s plane, without any fibre pull-out.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and machining performance of glass and coconut sheath fibre polyester composites using AWJM

Kalirasu

Rajini

Jappes³

et al. 2015

Journal of Reinforced Plastics and Composites

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This paper aims to address the responses of the AWJM parameters to two different reinforcement sources, viz, bidirectional glass mat (synthetic) and coconut sheath (natural) fibre, in a polymer matrix composite. The machining quality of the cut (kerf taper angle and surface roughness) was analysed, using the multi-objective response based on the L 9 (3 4 ) orthogonal array, using the Taguchi-based experimental grey relational analysis. The mechanical performance of the composites was studied before and after machining, to observe the interfacial adhesion between the fibre and the matrix due to the cutting force, using scanning electron microscopy (SEM). Only very little reduction in tensile strength was found after the machining of the composite in each case, and it indicates lesser stress formation due to the cutting forces. The machining performance of two different composite materials with the same wt % of fibre content was found experimentally; it showed significant changes in the results for both the materials. However, the abrasive particle size was identified as the most significant parameter influencing the quality of the cut in both the composites. A higher crack resistance was found in the glass mat composites due to their better interfacial adhesion capability.

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“…The RT (∼ 30°C fracture surface points to a relatively higher energy absorption compared to the smoother surface appearances for the high‐ and low‐temperature fracture surfaces. Sethi et al [ 23 ] found that the interlaminar shear strength becomes high at low temperatures and this may alter the interfacial failure and groove formation on polyester matrix. It was also observed by Miura et al [ 24 ] that the interlaminar shear strength properties of the reinforced polyester matrix were much improved at very low temperatures by reinforcing with glass fiber and the damaging effect was minimized by the enforcement.…”

Section: Resultsmentioning

confidence: 99%

Tensile properties of glass fiber‐reinforced polyester composites at extreme cold temperatures

Ahmed

Khanna

2020

Polymer Composites

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Glass fiber‐reinforced polymers are widely used in structural systems as load‐bearing elements at both high and low temperatures. This investigation presents the evaluation of glass fiber‐reinforced unsaturated polyester under quasi‐static tension loading at extremely cold temperatures. This work includes the preparation of polyester resin sheets and E‐glass fiber cloth reinforced polyester composite to determine the tensile properties and failure modes over a range of high to very cold temperatures over 60°C to −80°C. The results show that fiber reinforced polyester has higher strength at all temperatures compared to the unreinforced polyester matrix. The reinforced specimens exhibit a more uniform brittle trend at temperatures below room temperature (RT) and a reasonable ductility at and above RT. Tensile properties of the unreinforced material were found to degrade above RT. The composite has the highest strength at the lowest temperature of −80°C. Both monolithic and reinforced polyester are brittle in nature at temperatures below RT, though reinforced composites show slight ductility.

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An assessment of mechanical behavior and fractography study of glass/epoxy composites at different temperatures and loading speeds

Cited by 21 publications

References 19 publications

Flexural response of glass/epoxy composites to thermal shocks and conditioning environment in varying loading rate

Flexural response of glass/epoxy composites to thermal shocks and conditioning environment in varying loading rate

Mechanical and machining performance of glass and coconut sheath fibre polyester composites using AWJM

Tensile properties of glass fiber‐reinforced polyester composites at extreme cold temperatures

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