Mechanical properties of laminated bamboo under off-axis compression

Yang, Dong; Li, Hai Tao; Xiong, Zhenhua; Mimendi, Leonel; Lorenzo, Rodolfo; Corbi, Ileana; Corbi, Ottavia; Hong, Chaokun

doi:10.1016/j.compositesa.2020.106042

Cited by 59 publications

(24 citation statements)

References 28 publications

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“…When the oil heat-treated temperature is higher than 140 °C, the bending strength increases first and then decreases. The bending strength of the bamboo samples increase by 8.46%, 19.26% and 17.25%, respectively, after oil heat treatment at 160, 180 and 200 °C for 2 h. At the beginning of oil heat treatment, the moisture content at the fiber saturation point decreases, and the dimensional stability improves, resulting in the increase of the bending strength [52,53]. At the same temperature, the bending strength decreases with the time increasing, and it is mainly due to the degradation of chemical components including cellulose and hemicellulose.…”

Section: Effect Of Oil Heat Treatment On Physical and Mechanical Properties Of Bamboomentioning

confidence: 99%

The effect of oil heat treatment on biological, mechanical and physical properties of bamboo

Hao

Wang

Wang³

et al. 2021

J Wood Sci

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Bamboo is now widely used in construction, papermaking, textile, furniture and other fields because of its renewable, fast-growing, high-strength, high-yield and easy processing. However, compared with wood, bamboo and bamboo products are more vulnerable to damage by fungi and pests. An effective and eco-friendly method is urgently needed to improve their physical and chemical properties, decay resistance and anti-mildew properties, and hydrophobic properties. Here, bamboo was heated with methyl silicone oil. The effect of different temperatures (140 °C–200 °C) and different times (2 h–6 h) on the properties of bamboo was studied systematically, including chemical composition, physical and mechanical properties, surface wettability, decay resistance and anti-mildew property. No starch granules were observed inside the parenchymal cell lumen of bamboo specimen heat treated at 200 °C for 6 h. And with the increase of heat treatment temperature and time, the content of cellulose and hemicellulose decreases gradually while relative content of lignin increases due to its better thermal stability. Accordingly, the surface wettability decreases due to the changes of the surface functional groups and micro-morphologies. Under the condition of oil heat treatment at 160 °C for 2 h, the compressive strength parallel to grain of bamboo samples reach the maximum of 109.52 MPa. With further increase of heating temperature, the corresponding compressive strength decreases. The resulted bending strength and MOE both display similar changing trend. However, the optimal parameter is at 180 °C for 2 h, with the highest bending strength and MOE values of 142.42 MPa and 12,373.00 MPa, respectively. Finally, the decay resistance and anti-mildew property are dramatically enhanced with increased heat treatment temperature and time. All the corresponding changing mechanisms are investigated in depth and in detail. Our results provide comprehensive process parameters and micro-mechanism for the performance of oil heat treatment of bamboo, which can be used to guide the actual production.

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Section: Effect Of Oil Heat Treatment On Physical and Mechanical Properties Of Bamboomentioning

confidence: 99%

The effect of oil heat treatment on biological, mechanical and physical properties of bamboo

Hao

Wang

Wang³

et al. 2021

J Wood Sci

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“…The stiffness of the GO nano-platelets can be formulated with five elastic parameters, which are illustrate as below: The stiffness tensor for GO nano-platelets can be demonstrate as equation 31. This equation is based on Hill's elastic coefficients [67]. And:…”

Section: Stiffness Analysismentioning

confidence: 99%

Theoretical and Experimental investigation of PVMQ/ EPDM-g-MA/CR blends: Rheological, Compatibility and Mechanical Properties

Azizli

Vafa

Barghamadi

et al. 2021

Preprint

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The main problem of uncompatibilize rubbers nano-composites in polymeric matrix are accumulation and agglomeration of graphene oxide. In this study, EPDM-g-MA was used as a compatibilizer for better dispersion of graphene oxide (GO) in the phenyl-vinyl-methyl-polysiloxane/chloroprene rubber (PVMQ/CR) matrix. To achieve this purpose mechanical characterizations, rheology, morphology and curing characterizations of nano-composite was investigated. SEM and TEM were used to assess surface characteristics, morphology and dispersion of EPDM-g-MA in PVMQ/CR nano-composite, which showed the size of EPDM-g-MA in the blends became smaller, denser and more uniform. Also, the results showed that, by increasing the GO nano-platelets in PVMQ/CR matrix during the reaction with EPDM-g-MA, curing properties was improved such a way that optimum curing time and scorch time were decreased and also MH–ML and cure rate index (CRI) were increased and also toughness strength enhanced. In addition, the mechanical properties indicated that tensile strength, fatigue strength, hardness, elongation-at-break and modulus increased by the incorporation with GO nano-platelets.

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“…Mahdavi et al [26] found that the stiffness of LBL was comparable to that of wood, showing that LBL can be used in building structures. Yang et al [27] studied the off-axis compressive performance of LBL and examined the applicability of the commonly used strength criteria on LBL. Karyadi et al [28] investigated the mechanical properties of box-section LBL beams with different sidewall thickness and found that the strength of the beam significantly increased with the increase of the sidewall thickness.…”

Section: Introductionmentioning

confidence: 99%

Slenderness Ratio Effect on the Eccentric Compression Performance of Chamfered Laminated Bamboo Lumber Columns

Zhou¹,

Li²,

Dauletbek³

et al. 2022

Journal of Renewable Materials

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Eccentric compression tests on 15 chamfered laminated bamboo lumber (LBL) columns with a height ranging from 600 to 3000 mm were conducted in order to study the eccentric mechanical performance. The failure of all specimens was caused by the crack of bamboo fiber in the tensile region. When the ultimate strength was reached, except specimens with a height of 600 mm, all other specimens could bear large deformation, showing good ductility. The lateral displacements of the specimens under eccentric compression were approximately parabolic in the direction of column height. The ultimate bending moment of LBL columns with different slenderness ratios under compression with the same initial eccentricity was a fixed value. The relationship between ultimate capacity, axial displacement, lateral displacement, and slenderness ratio was analyzed based on test results. It was found that the plane section assumption could be used to express the stress and strain distribution of chamfered LBL columns under eccentric compression. A method for calculating the ultimate bearing capacity was proposed using a constitutive model based on the Ramberg-Osgood relation and the empirical formula for calculating the ultimate capacity was given on the basis of the former research as well as the test results in this paper.

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Mechanical properties of laminated bamboo under off-axis compression

Cited by 59 publications

References 28 publications

The effect of oil heat treatment on biological, mechanical and physical properties of bamboo

The effect of oil heat treatment on biological, mechanical and physical properties of bamboo

Theoretical and Experimental investigation of PVMQ/ EPDM-g-MA/CR blends: Rheological, Compatibility and Mechanical Properties

Slenderness Ratio Effect on the Eccentric Compression Performance of Chamfered Laminated Bamboo Lumber Columns

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