The failure mode variation in post-buckled GFRP columns with different stacking sequences - Experimental damage analysis and numerical prediction

Podolak, Piotr; Droździel, Magda; Czapski, Paweł; Kubiak, Tomasz; Bieniaś, J.

doi:10.1016/j.ijmecsci.2021.106747

Cited by 9 publications

(8 citation statements)

References 57 publications

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“…In addition, damage and failure modes are influenced by the stacking sequence. However, symmetric and asymmetric stacking sequences displayed negligible differences [ 39 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

Flexural Creep Behaviour of Pultruded GFRP Composites Cross-Arm: A Comparative Study on the Effects of Stacking Sequence

et al. 2022

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Pultruded glass fibre reinforced polymer (pGFRP) composites provide outstanding properties for composite polymer cross arms in power transmission line applications. This study has investigated the effects of various stacking sequences of fibres directions of pGFRP on flexural strength and creep behaviour. The use of static four-point bending flexural tests revealed that Stacking Sequence 2 (±45/0/90/0/90/0) had a significant flexural strength of 399.9 MPa while Stacking Sequence 1 (±45/90/0/±45) had a flexural strength of 242.5 MPa. Furthermore, the four-point bending creep experiments were performed at three distinct stress levels, notably 12%, 24%, and 37% of the ultimate flexural strength, to characterise the creep behaviour of distinct stacking sequences. Moreover, Findley’s power law equation for bending creep behaviour has revealed that the time-dependent reduction factor of Stacking Sequence 1 and Stacking Sequence 2 estimates a drop in flexural modulus of 23% and 10% respectively.

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“…In addition, damage and failure modes are influenced by the stacking sequence. However, symmetric and asymmetric stacking sequences displayed negligible differences [ 39 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

Flexural Creep Behaviour of Pultruded GFRP Composites Cross-Arm: A Comparative Study on the Effects of Stacking Sequence

et al. 2022

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“…[22][23][24][25][26][27][28] Experimental searches not only help to determine the crippling, but also it provides to specify the effecting parameters of the crippling strength and improve an understanding for the mechanics of the composite structures under the effect of compressive loads. In general, it is possible to gather the influential factors in three groups as geometrical effects, [29][30][31][32][33][34] material, [35][36][37][38][39] and boundary conditions. [40][41][42] For geometrical effects, the widths of flanges and webs are generally utilized to specify the buckling performance by increasing the structural stiffness.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, either the percentage and/or the places of the 0 and 45 plies do not assure the high crippling and/or ultimate strengths. 3,10 Podolak et al 38 study the effects of 0 and 45 plies for post-buckling strengths. For that aim, square columns made of glass fiber reinforced polymers (GFRP) are tested and verified numerically.…”

Section: Introductionmentioning

confidence: 99%

“…So that, post-buckling strength can be increased by employing CFRP instead of GFRP. 38,51 In addition, changing the material inclusions can reinforce the laminated structures against crippling. Özbek 37 adds silica nanoparticles into Kevlar epoxy fiber reinforced material and encounters a significant enhancement at the buckling and postbuckling performance of the samples.…”

Section: Introductionmentioning

confidence: 99%

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A new parameter to describe crippling strength: Experimental and theoretical investigations for post‐buckling behaviors of the composite structures

Yıldırım,

Ünal

2023

Polymer Composites

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The post‐buckling strength, which is simply called as crippling, is investigated for laminated composite structures in this study. L profiles that had various stacking sequences of carbon fiber reinforced epoxies were tested. Three different layups configurations were used by changing flange‐to‐thickness ratios. The main objective of this research was to show that flange‐to‐thickness ratio was not the only effecting parameter for crippling. Therefore, a new parameter, EGY number, was developed by considering the positions of 0° and 45° plies. Depending on EGY number, a new semi‐empirical formulation was presented to calculate crippling strength of the laminated composite structures. One of the test results was employed to verification of EGY number. In addition, the test results were validated with finite element analyses. Static, Riks and Dynamic, Explicit computational results were compared to simulate the experiments.Highlights Determination of crippling strength both experimentally and theoretically. Comparison of numerical models: Static, Riks versus Dynamic, Explicit. Developing a new parameter called as EGY number. Developing of a new analytical semi‐empirical formula for crippling strength.

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“…Due to its high specific strength and specific stiffness, fiber-reinforced plastic (FRP) has become one of the best choices for beam structures to balance lightweight and stiffness performance requirements. [3][4][5][6] FRP is a new material that combines fibers and matrix materials in a composite process. Its material properties are significantly variable in different directions, exhibiting anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Distribution law of strain energy density for stiffness design of GFRP, UT/GFRP, and VRB/GFRP hybrid hat‐shaped beams

et al. 2022

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The failure mode variation in post-buckled GFRP columns with different stacking sequences - Experimental damage analysis and numerical prediction

Cited by 9 publications

References 57 publications

Flexural Creep Behaviour of Pultruded GFRP Composites Cross-Arm: A Comparative Study on the Effects of Stacking Sequence

Flexural Creep Behaviour of Pultruded GFRP Composites Cross-Arm: A Comparative Study on the Effects of Stacking Sequence

A new parameter to describe crippling strength: Experimental and theoretical investigations for post‐buckling behaviors of the composite structures

Distribution law of strain energy density for stiffness design of GFRP, UT/GFRP, and VRB/GFRP hybrid hat‐shaped beams

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