Bending properties evaluation of newly designed reinforced bamboo scrimber composite beams

Zhong, Yong; Wu, Guofang; Ren, Haiqing; Jiang, Zehui

doi:10.1016/j.conbuildmat.2017.03.052

Cited by 74 publications

(35 citation statements)

References 18 publications

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“…The tension strength, compression strength, and shear strength parallel to grain, of the bamboo scrimber were obtained by experiments (Zhong and Wu 2017). …”

Section: Methodsmentioning

confidence: 99%

“…The bending properties of RBSC beam was investigated by experiment. When the beam was loaded to failure, cracking across the neutral plane of the beam was observed in some specimens, and the bearing capacity of the beam was much lower than the beams failed due to tension of the bamboo fiber (Zhong et al 2017). Micro-cracks were introduced into the beam during the manufacturing process, the fracture mechanics may explain the cracking behavior and be used to predict the failure load of the RBSC beam.…”

Section: Introductionmentioning

confidence: 99%

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Mode II Fracture Toughness of Bamboo Scrimber with Compact Shear Specimen

Zhong

Gong

et al. 2017

BioResources

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The mode II fracture toughness of bamboo scrimber was evaluated. A compact shear specimen was chosen as the specimen, while the stress intensity factor KIIC was chosen as the index for the mode II fracture toughness. In total, 54 specimens containing two different grain modes and three different thicknesses were manufactured and subjected to static loading with specially designed loading clamps. The failure modes were observed, and the crack initiating loads were obtained. The stress intensity factor was calculated and analyzed. The failure of all specimens was due to brittleness and occurred instantaneously. Thus, the linear elastic fracture mechanics is applicable to the mode II fracture of bamboo scrimber. The stress intensity factor KIIC was 459.9 MPa·m 1/2 for the F-L grain mode and 358.0 MPa·m 1/2 for the S-L grain mode. There was no significant difference in the stress intensity factor KIIC of specimens where the thickness ranged from 10 mm to 30 mm; a specimen with a thickness of 10 mm can be used to determine the fracture toughness of the bamboo scrimber.

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“…The tension strength, compression strength, and shear strength parallel to grain, of the bamboo scrimber were obtained by experiments (Zhong and Wu 2017). …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mode II Fracture Toughness of Bamboo Scrimber with Compact Shear Specimen

Zhong

Gong

et al. 2017

BioResources

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“…(2) Preparation of CFRP sheets: cut the prepreg CFRP into required sizes, bond them into sheets for the required thickness, and cure them in an incubator for 90 min at 120°C. (3) Preparation of CBSC beams: polish the bamboo scrimber sheets and CFRP sheets with 240 Grit sandpaper to remove oil stains, etc., from the surface to form a certain surface roughness to enhance the bonding force, scrub the surface of the bamboo scrimber and CFRP sheets with alcohol to further remove grease and contaminants, mix Component A and B of Sikadur-330 in a certain proportion and stir it for about 5 min, apply the adhesive to the surface of the bamboo scrimber sheets with a special brush to adhere the element, make sure the thickness of the adhesive layer is 0.3 mm, and then cure it in the incubator for 90 min at 45°C [12].…”

Section: Specimen Preparationmentioning

confidence: 99%

“…A remarkable observation in the study was a pronounced ductile zone in a reinforced beam and a completely brittle zone in an unreinforced beam. Yong et al [12] studied the flexural performance of the reinforced bamboo scrimber composite (RBSC) beam combining the bamboo element and the steel bars. The results indicated that the reinforcement and the bamboo elements could firmly form an integrated composite cross-section.…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Wu¹,

Huang²,

Li³

2019

Journal of Renewable Materials

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This study presents a new structure made up of bamboo scrimber and carbon fiber reinforced polymer (CFRP) to address the low stiffness and strength of bamboo scrimbers. Three-point bending test and finite element model were conducted to study the failure mode, strain-displacement relationship, load-displacement relationship and relationships between strain distribution, contact pressure and deflection, and adhesive debonding. The results indicated that the flexural modulus and static flexural strength of the composite beams were effectively increased thanks to the CFRP sheets. The flexural modulus of the composite specimens were 2.33-2.94 times that of bamboo scrimber beams, and the flexural strength were 1.49-1.58 times that of bamboo scrimber beams. Adhesive debonding had a great influence on the strain distribution and deflection of the composite specimens. It was an important factor for the failure of the CFRP-bamboo scrimber composite specimens. According to the finite element simulation, the strain distribution, contact pressure and deflection also greatly changed with the adhesive debonding. After complete peeling, the deflection of the specimen was 3.09 times that of the unpeeled because it was no longer an integral beam.

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“…During the forming processes of BS, there are many physical and chemical changes to bamboo cells, such as compressing, bonding, and densifying [1][2][3][4][5]. Compared with other bamboo composites, bamboo scrimber has comparatively higher raw material utilization rate because the bamboo bark has not been removed [6][7][8][9][10]. Therefore, bamboo scrimber has a desirable texture, high hardness, and longitudinal strength properties [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of the Performance of Two Kinds of Waterborne Coatings on Bamboo and Bamboo Scrimber

Liu

et al. 2019

Coatings

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For this paper, two kinds of waterborne coatings, polyurethane acrylate (PUA) and epoxy resin, were synthesized and then coated onto neat bamboo and bamboo scrimber (BS), respectively. The coating performance of the samples was investigated. The results showed that, for the two kinds of coatings, there was a chemical reaction occurring between both coatings and the substrates. The permeability with respect to bamboo was higher than that of BS, while that of the epoxy resin coating was better than PUA. However, the PUA film was smoother than epoxy resin. The epoxy resin coating on bamboo had the best adhesion, which was at a 1 level. The abrasion values of the four samples varied in the same substrate. A higher hardness of the coating film was obtained when coated with PUA. In general, the coating performance of bamboo scrimber was poorer than that of bamboo, either coated with PUA or epoxy resin. The epoxy resin had a better coating performance than PUA.

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Bending properties evaluation of newly designed reinforced bamboo scrimber composite beams

Cited by 74 publications

References 18 publications

Mode II Fracture Toughness of Bamboo Scrimber with Compact Shear Specimen

Mode II Fracture Toughness of Bamboo Scrimber with Compact Shear Specimen

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

A Comparison of the Performance of Two Kinds of Waterborne Coatings on Bamboo and Bamboo Scrimber

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