Fracture Toughness of Symmetric and Asymmetric Layup GFRP Laminates by Experimental and Numerical Methods

Shrivastava, Ruchir; Singh, K.K.

doi:10.1007/978-981-13-9016-6_2

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…Synthetic fibers such as glass, carbon, and basalt are readily available. However, glass fibers are favored in many cases due to their cheap cost [5][6][7][8]. The polymer performance depends upon its glass transition temperature (GTT), and exposure to high or low temperatures may hamper its strength.…”

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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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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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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“…Lourenço et al 20 compared the advantages of CT specimen and Wide Compact Tension (WCT) specimen in studying the transverse fracture performances of pultruded GFRP material, they found WCT specimen more valid and thought the relationship between the fiber layups and fracture property should be studied. Shrivastava and Singh 21 conducted an experiment about the fracture toughness of symmetric and asymmetric layup GFRP laminates and the result indicates that the fracture performance of asymmetric layup is better. Lourenço et al 22 used the pultruded GFRP material with different fiber layups and geometries.…”

Section: Introductionmentioning

confidence: 99%

Translaminar mode-I fracture toughness experiment of pultruded GFRP laminates using extended compact tension specimen

Xiong

Meng

Zhao

et al. 2022

Journal of Composite Materials

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This paper conducted experiments and theoretic analysis of the fracture performance of pultruded GFRP (Glass Fiber Reinforced Polymers) laminates. The mode-I fracture toughness of pultruded GFRP laminates was evaluated by the eccentrically loaded, Extended Compact Tension (ECT) specimen. The geometry of specimen and experimental procedure refer to ASTM E1922. A total of 16 specimens were tested, which included 0° and 90° roving orientation. Finite element analysis with the Virtual Crack Closure Technique (VCCT) was implemented to calibrate the experimental results. A correction function for normalized notch length was proposed for pultruded GFRP translaminar fracture toughness. Carpet plot was designed to discuss the relationship between fiber volume ratio and fracture toughness, which demonstrated that the fracture toughness strongly correlated with the fiber volume ratio. Also, the effect of fraction of 0° layers on fracture toughness and material orthotropy was studied. The relationship of material orthotropy parameter and fracture toughness was discussed.

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“…Fiber-reinforced polymer (FRP) is an influential material in aerospace, marine, automotive industries. [1][2][3][4][5][6] These are highly accepted due to its properties such as high specific strength-to-weight ratio, high stiffness-to-density ratio and high endurance limit. 5,[7][8][9][10][11][12][13][14][15] Moreover, the designing of any structural part inherently requires joining at some point.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] These are highly accepted due to its properties such as high specific strength-to-weight ratio, high stiffness-to-density ratio and high endurance limit. 5,[7][8][9][10][11][12][13][14][15] Moreover, the designing of any structural part inherently requires joining at some point. Therefore joining related irregularities are often investigated in literature.…”

Section: Introductionmentioning

confidence: 99%

An experimental and statistical evaluation of flexural performance of single and double notched glass/epoxy composite

Shrivastava

Kumar

Singh

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The existence of a notch in a composite structure is inevitable. However, its presence automatically changes the stress distribution pattern in the component. The present work analyses the flexural performance of glass/epoxy composite with single and pair holes in different locations and sizes. In paired holes (2 mm diameter), stress concentrations were placed at a distance of 10, 20 and 30 mm. In single hole specimens, the notch locations were at 4, 8 and 12 mm distance with hole diameter of 2, 4 and 6 mm. The work suggests a significant drop (30.21%) of flexural strength with a hole placed at 10 mm, which eventually reduced up to 14 ± 1% with the hole moving further away in a paired configuration. Although, the optimum performance was at 20 mm location with improvement in flexural modulus by 12.27%. The single hole arrangement reiterates the significance of hole location and reports that flexural strength decreases significantly as it moves away from the support end (42.44%). However, this drop is never linear, suggesting a fall between mid-location. The notch size appears as an important element in flexural performance for it changes the stress distribution around the hole and the associated damage propagation. The above analysis supported Weibull statistics and found good agreement with experimental results.

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Fracture Toughness of Symmetric and Asymmetric Layup GFRP Laminates by Experimental and Numerical Methods

Cited by 5 publications

References 14 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

Translaminar mode-I fracture toughness experiment of pultruded GFRP laminates using extended compact tension specimen

An experimental and statistical evaluation of flexural performance of single and double notched glass/epoxy composite

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