Through-culm wall mechanical behaviour of bamboo

Akinbade, Yusuf; Harries, Kent A.; Flower, Chelsea V.; Nettleship, Ian; Papadopoulos, Christopher; Platt, Shawn

doi:10.1016/j.conbuildmat.2019.04.214

Cited by 72 publications

(24 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Anatomically, bamboo consists of fiber bundles (40%), parenchymal cells (50%), and vessels (10%), as shown in Figure 2 [ 28 , 30 , 31 ]. The mechanical properties of bamboo are correlated to its structure and fiber orientation.…”

Section: Bamboomentioning

confidence: 99%

“…In contrast, at the meso-level, it can be seen through the bamboo culm wall thickness, as shown in Figure 3 , that the fiber distribution is not homogenous. The density of fibers is functionally graded, increasing from inner to the outer region of the wall [ 30 , 32 , 33 ]. In addition, the fiber concentration is higher in the upper half of the culm than the bottom [ 28 , 34 ].…”

Section: Bamboomentioning

confidence: 99%

“…The lack of homogeneity across the bamboo thickness is one of the negative points of using bamboo culm directly in the construction industry. Anatomically, bamboo consists of fiber bundles (40%), parenchymal cells (50%), and vessels (10%), as shown in Figure 2 [28,30,31]. The mechanical properties of bamboo are correlated to its structure and fiber orientation.…”

Section: Bamboomentioning

confidence: 99%

See 2 more Smart Citations

Densification of Bamboo: State of the Art

et al. 2020

View full text Add to dashboard Cite

Densification processes are used to improve the mechanical and physical properties of lignocellulose materials by either collapsing the cell cavities or by filling up the pores, consequently reducing the void volume fraction. This paper focuses on an extensive review of bamboo densification process, which is achieved by compressing the material in the direction perpendicular to the fibers using mainly two different techniques: an open system, thermo-mechanical (TM), or a closed system, viscoelastic-thermal-compression (VTC). The main aim of bamboo densification is to decrease its heterogeneity, as well as to improve its mechanical and physical performance. In addition, densification may occur during the manufacturing of bamboo products in which hot-pressing processes are used to mold bamboo panels. There are over 1600 publications about bamboo, concentrated in the recent decade, mainly about engineered materials. Although several papers regarding bamboo and wood densification are available, very few studies have comprehensively investigated the densification process solely through compression of natural bamboo culms. According to the literature, applying a combination of compression of 6–12 MPa at temperatures between 120–170 °C for 8–20 min can produce materials with higher strength in comparison to the mechanical properties of natural bamboo. The majority of research on bamboo densification indicates that the modified material results in improved properties in terms of density, hardness, bending strength, stiffness, and durability. This paper provides a review that consolidates knowledge on the concept of bamboo culm densification, discusses the roles of parameters that control the process, ascertains the best practice, and finally determines gaps in this field of knowledge.

show abstract

Section: Bamboomentioning

confidence: 99%

Section: Bamboomentioning

confidence: 99%

Section: Bamboomentioning

confidence: 99%

See 1 more Smart Citation

Densification of Bamboo: State of the Art

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The gradient characteristics of plants is beneficial to enhance the flexural rigidity of the plants per unit mass. However, the complex transverse behavior of bamboo in the direction transverse to the fiber does not seem to be like the classic fiber-reinforced composite material ( Akinbade et al., 2019 ). The properties of the bamboo fibers are determined through the chemical composition, tensile test, and SEM test.…”

Section: Dry Gradient and Wet Gradientmentioning

confidence: 99%

Progress in Bioinspired Dry and Wet Gradient Materials from Design Principles to Engineering Applications

Dong

Hong

et al. 2020

iScience

View full text Add to dashboard Cite

Summary Nature does nothing in vain. Through millions of years of revolution, living organisms have evolved hierarchical and anisotropic structures to maximize their survival in complex and dynamic environments. Many of these structures are intrinsically heterogeneous and often with functional gradient distributions. Understanding the convergent and divergent gradient designs in the natural material systems may lead to a new paradigm shift in the development of next-generation high-performance bio-/nano-materials and devices that are critically needed in energy, environmental remediation, and biomedical fields. Herein, we review the basic design principles and highlight some of the prominent examples of gradient biological materials/structures discovered over the past few decades. Interestingly, despite the anisotropic features in one direction (i.e., in terms of gradient compositions and properties), these natural structures retain certain levels of symmetry, including point symmetry, axial symmetry, mirror symmetry, and 3D symmetry. We further demonstrate the state-of-the-art fabrication techniques and procedures in making the biomimetic counterparts. Some prototypes showcase optimized properties surpassing those seen in the biological model systems. Finally, we summarize the latest applications of these synthetic functional gradient materials and structures in robotics, biomedical, energy, and environmental fields, along with their future perspectives. This review may stimulate scientists, engineers, and inventors to explore this emerging and disruptive research methodology and endeavors.

show abstract

“…The lack of detailed design standards-despite recent progress [6]-and incomplete understanding of bamboo structural member behaviour hinder its wider adoption in construction. Specifically, bamboo is a natural composite with hierarchical structure that governs its mechanical behaviour [7][8][9][10]. Fullculm (or round-culm) bamboo flexural members exhibit a particularly complicated mechanical behaviour, which typically entails an initial elastic stage, followed by a stage where stiffness progressively declines, until failure [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Insight into the behaviour of bamboo culms subjected to bending

Mouka

Dimitrakopoulos

Lorenzo

2022

J. R. Soc. Interface.

View full text Add to dashboard Cite

This study describes analytically the behaviour of bamboo culms subjected to bending, and predicts the failure load and stiffness loss after the linear-elastic stage. Basis of the failure load prediction is the identification of the critical failure mechanisms. The study examines analytically four distinct failure mechanisms: Brazier instability, longitudinal tension/compression, tension perpendicular to the fibres and shear parallel to the fibres. It concludes that, for the three bamboo species examined (Moso, Guadua and Kao Jue), critical failure mechanisms are tension perpendicular to the fibres (with potential tension–shear interaction) and longitudinal compression. Which of the two mechanisms occurs first depends on the case-specific material properties and culm radius-to-thickness ratio. Regarding stiffness loss, the main cause is longitudinal splitting. The extent of the stiffness loss depends on crack length, crack number and crack location along the culm circumference. Secondary causes are nonlinear geometric effects at the large deflection stage. Assuming a parabolic deformed shape, a single equation can describe the stiffness loss induced by nonlinear geometric effects, regardless of material properties and culm geometry. Comparing the analytical results with pertinent experimental data, the proposed equations are sufficiently accurate in their prediction of failure load and stiffness loss, although they tend to underestimate both.

show abstract

Through-culm wall mechanical behaviour of bamboo

Cited by 72 publications

References 25 publications

Densification of Bamboo: State of the Art

Densification of Bamboo: State of the Art

Progress in Bioinspired Dry and Wet Gradient Materials from Design Principles to Engineering Applications

Insight into the behaviour of bamboo culms subjected to bending

Contact Info

Product

Resources

About