The role of reinforcement architecture on impact damage mechanisms and post-impact compression behaviour

Bibo, G.A.; Hogg, P.J.

doi:10.1007/bf00353091

Cited by 172 publications

(72 citation statements)

References 128 publications

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“…At higher volume fractions, the matrix is sufficiently restrained and the stress is more evenly distributed. This results in reinforcing effects outweighing the effects of the stress concentrations and results in increase of impact strength at higher fibre loading [13]. Although, benefit was seen in higher fibre loading, however, the fibre loading was limited to 25 wt% due to limited wettability of the resin; and higher than 25 wt% (for example 30 wt%) the polyester resin could not wet the fiber sufficiently and could not penetrate into the fiber mass.…”

Section: Results and Discussion 31 Impact Propertiesmentioning

confidence: 99%

“…At higher volume fractions, the matrix is sufficiently restrained and the stress is more evenly distributed. This results in reinforcing effects outweighing the effects of the stress concentrations and results in increase in flexural strength and modulus [13,16]. Although, the flexural behavior of composites without LNR tended to behave like composite with LNR, however, generally a slight reduction of strength and modulus were found for composites with LNR.…”

Section: Flexural Strength Of Compositementioning

confidence: 99%

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Mechanical properties and environmental stress cracking resistance of rubber toughened polyester/kenaf composite

Bonnia

Ahmad²,

Zainol

et al. 2010

Express Polym. Lett.

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Abstract. In this study rubber-toughened polyester-kenaf fibre composites were prepared by adding various percentages of kenaf fibre in unsaturated polyester resin and subsequently cross linked using a mixture of organic peroxide methyl ethyl ketone and cobalt octanoate. Three percent (3%) of liquid natural rubber (LNR) were added as a toughening agent. The mechanical properties of the composites were evaluated by impact and flexural testing. Environmental stress cracking resistance (ESCR) of polyester-kenaf composite in acid and base medium was also studied. It was found that the addition of LNR increased impact strength by about 66% and flexural strength by 70%. Measurement of ESCR shows that the composite has the fastest diffusion rate in acid medium, followed by that in base medium and then without medium. Bonding mechanisms were assessed by scanning electron microscope and FTIR analysis.

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Section: Results and Discussion 31 Impact Propertiesmentioning

confidence: 99%

“…At higher volume fractions, the matrix is sufficiently restrained and the stress is more evenly distributed. This results in reinforcing effects outweighing the effects of the stress concentrations and results in increase in flexural strength and modulus [13,16]. Although, the flexural behavior of composites without LNR tended to behave like composite with LNR, however, generally a slight reduction of strength and modulus were found for composites with LNR.…”

Section: Flexural Strength Of Compositementioning

confidence: 99%

Mechanical properties and environmental stress cracking resistance of rubber toughened polyester/kenaf composite

Bonnia

Ahmad²,

Zainol

et al. 2010

Express Polym. Lett.

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“…This might improve interfacial adhesion between the fibers and matrices after BMA is introduced, improving the tensile strength and flexural strength of composites BMA-10 and BMA-20. The long molecular chains of BMA in the composites helped disperse instantaneous loading and effectively prevented stress concentration when the composites were loaded (Bibo et al 1996). This is responsible for the increase in the elongation at break, flexural strain, and impact strength of the composites with 10 or 20 wt.% BMA.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Mechanical and Thermal Properties of Hemp Fiber-Unsaturated Polyester Composites Toughened by Butyl Methacrylate

et al. 2015

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Hemp fiber-reinforced unsaturated polyester (UPE) composites were prepared by hand lay-up compression molding. The UPE resins were modified with butyl methacrylate (BMA) to improve the flexibility and toughness of the hemp-UPE composites. The results indicate that the toughness of the composites significantly increased as BMA usage increased. Compared to the unmodified UPE composites, the composites obtained from BMA-modified UPE resins had 27.4, 63.0, and 36.6% greater elongation at break, flexural strain, and impact strength, respectively. The optimum BMA usage to achieve an adequate balance of stiffness and toughness is 20 to 30%. Dynamic mechanical analysis (DMA) indicated that incorporation of BMA significantly decreased the storage modulus and glass transition temperature of the composites and increased its damping parameter due to the introduction of flexible segments into the UPE resins. Thermogravimetric analysis showed that the thermal stability of the composites decreased slightly following the incorporation of BMA. Scanning electron microscopy images of the impact-fractured surfaces of the composites revealed that BMA incorporation improved interfacial adhesion between hemp fibers and UPE matrices and that the main mechanism for the increase in the toughness of the composites was the added ductility of the matrices.

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“…It has been reported that tensile, compressive, and exural strengths can be reduced signicantly in the presence of impact damage [92,93]. In order to design damage tolerant structures, considerable amount of research has been aimed at the study of the residual strengths under in-plane loads, however, those under bending loads have not received much attention [94].…”

Section: Residual Strengthmentioning

confidence: 99%

Identification of the local stiffness reduction of a damaged composite plate using the virtual fields method

Kim

Pierron

Wisnom

et al. 2007

Composites Part A: Applied Science and Manufacturing

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For the purpose of returning to Earth And I do not call one a Brahmana on account of his birth or of his origin from (a particular) mother; (but) the one who is possessed of nothing and seizes upon nothing, him I call a Brahmana.The man who is free from anger, endowed with (holy) works, virtuous, without desire, subdued, and wearing the last body (antimasarira), him I call a Brahmana.The man who is not hostile amongst the hostile, who is peaceful amongst the violent, not seizing (upon anything) amongst those that seize (upon everything), him I call a Brahmana.Whosoever has passed over this quagmire dicult to pass, (who has passed over) revolution (samsara) and folly, who has crossed over, who has reached the other shore, who is meditative, free from desire and doubt, calm without seizing (upon anything), him I call a Brahmana. Sutta Nipata, Book 3, Chapter 9 AcknowledgementsThis thesis is the record of my four years' exploration into a new world and myself.

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The role of reinforcement architecture on impact damage mechanisms and post-impact compression behaviour

Cited by 172 publications

References 128 publications

Mechanical properties and environmental stress cracking resistance of rubber toughened polyester/kenaf composite

Mechanical properties and environmental stress cracking resistance of rubber toughened polyester/kenaf composite

Mechanical and Thermal Properties of Hemp Fiber-Unsaturated Polyester Composites Toughened by Butyl Methacrylate

Identification of the local stiffness reduction of a damaged composite plate using the virtual fields method

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