Experimental Studies on Strength Behaviour of Notched Glass/Epoxy Laminated Composites under Uni-axial and Bi-axial Loading

Guptha, V. L. Jagannatha; Sharma, Ramesh S.

doi:10.1007/s40032-017-0413-7

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…They are phenomenological models based on curve fitting. Tsai-Wu and Tsai-Hill are commonly used firstgeneration failure criteria for predicting failure of orthotropic materials ( [13], [14], [15]). Though these criteria could predict failure of material point they don't account for the influence of strength and stiffness degradation.…”

Section: Hashing Damage Criteriamentioning

confidence: 99%

Effect of ply orientation, staking sequence and notch geometry on the failure behaviour of glass fibre-reinforced epoxy composite laminates: A numerical investigation

Mohammad

2022

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

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A detailed numerical failure analysis was conducted for unidirectional glass fibre-reinforced epoxy composite laminates having an elliptical cut-out at the centre using Hashin’s damage model. The major axis, a, of the elliptical cut-out was fixed while the minor axis, b, was varied in such a way, that its upper extreme represented a situation of the plate with a circular hole, while the lower extreme of it represented the presence of a sharp crack in the structure. For angle ply cases, plies oriented along the material direction predicted an ever-increasing load replicating an elastic analysis without any damage accumulation. Such exceptionally higher stiffness and resistance to deformation were much anticipated, as the uni-axial tensile load was applied along fibre direction which shares a large portion of the load in comparison to the matrix material. While the plies oriented perpendicular to the direction of the material behaved as the weakest stack-up sequence in resisting uni-axial tensile load. Multi-angle hybrid composites predicted uneven failure behaviour. For the different combinations of multi-angle layups and minor axis, b, different trends for peak loads were observed. Interestingly, extension-shear coupling was observed for a few configurations which were marginally negligible for others. The variation of opening stress along the transverse direction predicts some very interesting observations. For the higher value of b, the opening stress decreases as we moved away from the irregularity. However, the situation of a plate with a sharp crack (b → 0) showed the effect of crack tip blunting. Near the vicinity of the sharp crack, the opening stress first dropped, then picked up, and again kept on decreasing as we move away. The drop in the stress near the vicinity of the sharp crack is attributed to the blunting of the crack tip.

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Section: Hashing Damage Criteriamentioning

confidence: 99%

Effect of ply orientation, staking sequence and notch geometry on the failure behaviour of glass fibre-reinforced epoxy composite laminates: A numerical investigation

Mohammad

2022

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

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“…Therefore joining related irregularities are often investigated in literature. 16 FRP components are connected using bolted joints, adhesion joints or a combination of both. The bolted joints offer low creep compliance, thermal stability and easy repair benefits.…”

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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“…Jagannatha Guptha and Sharma 11 experimentally studied the failure and damage behaviours of glass fiber composite laminates with open hole under uniaxial and bi-axial loading statue. Effect of fiber orientation had been studied.…”

Section: Introductionmentioning

confidence: 99%

An approximate analytical model for modification of size effect law for open-hole composite structure under biaxial load

Abdellah

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Nominal strength prediction remains the main challenge in the field of design and manufacturing of composite laminates. An approximate model to study the stress distribution around a circular hole in composite laminates is derived in this study. This model is constructed using well-known cohesive zone models and mainly depends on the un-notch strength and in-plane fracture toughness. The model attempts to modify and extend the specimen size effect curves, extracted using two-parameter cohesive laws (linear, exponential, and constant), into a biaxial stress state. It successfully predicts the damage initiation, propagation, and fracture of multidirectional composite laminates. Moreover, the stress concentration factor for a composite plate under varying biaxiality is calculated.

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Experimental Studies on Strength Behaviour of Notched Glass/Epoxy Laminated Composites under Uni-axial and Bi-axial Loading

Cited by 5 publications

References 22 publications

Effect of ply orientation, staking sequence and notch geometry on the failure behaviour of glass fibre-reinforced epoxy composite laminates: A numerical investigation

Effect of ply orientation, staking sequence and notch geometry on the failure behaviour of glass fibre-reinforced epoxy composite laminates: A numerical investigation

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

An approximate analytical model for modification of size effect law for open-hole composite structure under biaxial load

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