Asymmetric flexural behavior from bamboo’s functionally graded hierarchical structure: Underlying mechanisms

Habibi, Meisam K.; Samaei, Arash; Gheshlaghi, Behnam; Lü, Jian; Lu, Yang

doi:10.1016/j.actbio.2015.01.038

Cited by 190 publications

(77 citation statements)

References 21 publications

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“…Through such study, bamboo may be may become established as a conventional structural material. Janssen (1981Janssen ( , 2000 b similar to k = 0.43 reported by Habibi et al (2015) c Duff (1941), Janssen (1981Janssen ( , 2000 and Vaessen and Janssen (1997) d Ghavami et al (2003) and similar to k ≈ 2.2 reported by Nogata and Takahashi (1995) decreases with height increased with height effect of material property gradient on effective culm geometric properties (see Table 1) marginal, less than 5% increase 10-20% increase increase in buckling capacity over that calculated using minimal section (see Table 4) significant: Moso greater than 50% Guadua greater than 25% …”

Section: Discussionsupporting

confidence: 65%

“…The exponent k describes the fibre volume distribution; for instance, k = 1 for a linear distribution and k = 2 for quadratic. Habibi et al (2015) report a value of k = 0.43 for samples of p. edulis (Moso); Dixon and Gibson (2014) report values ranging from k = 1.64 to 2.11 dependent on the height along the Moso culm and Nogata and Takahashi (1995) propose k ≈ 2.2, also for Moso. In order to reasonably bound the results reported in the literature, in this discussion values of k= 0.5, 1.0 and 2.0 will be considered.…”

Section: Materials Properties Through Culm Wall Thicknessmentioning

confidence: 99%

“…1c). The variation in density through the culm wall has been assumed by previous researchers to be linear (Duff 1941;Janssen 1981;Vaessen and Janssen 1997), quadratic (Ghavami et al 2003), exponential (Nogata and Takahashi 1995;Dixon and Gibson 2014) or a power function (Habibi et al 2015) and is known to be species-dependent (Amada et al 1996 and. Regardless, due to the complex variation of the fibers and vascular bundles, the variation of mechanical properties through the culm-wall thickness has been shown to be significant (Richard and Harries 2015) and to have the effect of increasing gross culm stiffness by about 10% as compared to a uniform distribution of the same volume of fibers (Janssen 2000).…”

Section: Introductionmentioning

confidence: 99%

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Geometric and material effects on bamboo buckling behaviour

Harries

Bumstead

Richard

et al. 2017

Proceedings of the Institution of Civil Engineers - Structures

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Bamboo is a functionally graded material that has evolved to resist its primary loading in nature. This study focuses on the effects of geometric and material property variation along the culm length on the capacity of an axially-loaded member. Conservatively, compression capacity may be calculated using the smallest section of the member; however, this results in an inefficient use of the culm and may limit the use of long compression members. A more realistic estimate of capacity is obtained by considering the effects of culm taper on buckling capacity. Culm taper is experimentally investigated for three representative bamboo species. The effects of culm section gradient on geometric properties is examined followed by an assessment of geometric variation along the culm height. Following this, a series of buckling analyses of tapered culms is conducted to illustrate the significant effects of taper on culm compression capacity. This analysis is supplemented with comparisons to experimental culm buckling data. Beyond compressive capacity, the implications of culm taper are discussed in terms of flexural behaviour, design of gridshells (involving pre-bent axial load-carrying members), visual grading of bamboo and ultimately classification of the many species of bamboo presently used in construction worldwide.

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Section: Discussionsupporting

confidence: 65%

Section: Materials Properties Through Culm Wall Thicknessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geometric and material effects on bamboo buckling behaviour

Harries

Bumstead

Richard

et al. 2017

Proceedings of the Institution of Civil Engineers - Structures

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“…At the same time, the loading rates have no influence on the tensile fracture mode. It is well known that bamboo has a kind of functional graded hierarchical structure with the outer layer being stiff and the inner layer being softer [36,40]. From Figure 11 it is easy to see that the hybrid I-II failure mode is the prominent feature, similar to that given in Ref.…”

Section: Macroscopic Tensile Behaviors Of the Bamboos Under Differentsupporting

confidence: 66%

“…In the aspect of structural materials, they could be used as bamboo scaffolds [4][5], bamboo bridges [6], laminated bamboo [7][8][9][10][11], parallel strand bamboo lumber [12][13], bamboo concrete/cement composite structure [14][15][16][17][18][19][20] , bamboo fiber reinforced composites [21][22][23][24][25][26], sound absorbing materials [27] and so on. In the aspect of mechanical properties, researches revealed that bamboos have excellent flexibility and fracture toughness, which are mainly related to their tubular shape [28][29][30][31][32], the selfadaptive distribution of nodes [24,[33][34], the gradient distribution of vascular bundles and the hierarchical fiber/foam-like parenchyma cells [35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Quasi-Static and Tensile Behaviors of the Bamboos

Gong¹,

Cui²,

Zhao³

et al. 2017

Preprint

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Abstract:In this paper, quasi-static axial compression tests are performed on the nodal Moso bamboos to study the size effect on energy absorption of the bamboos and the damage pattern of the multiple bamboo columns. Experimental results show that under the same moisture content, growth age and growing environment, the specific energy absorption (SEA) of the test samples increases with the increase of the out-diameter and thickness of the bamboo columns, indicating that size effect exists for energy absorption of the Moso Bamboos. For the multiple bamboo columns, there are mainly three failure modes for the constituent single bamboo columns: splitting above the node, splitting below the node and splitting through the node. Also, the tensile tests are conducted on three kinds of dog-bone shaped bamboo samples to investigate the macroscopic tensile fracture mode in the longitudinal direction of Moso bamboos. Results show that there is no direct relationship between the fracture pattern and moisture content of the bamboos, as well as the growth age of the bamboos. However, the tensile loading rate and the shape of the dog-bone shaped bamboo sample could affect the macroscopic fracture pattern of the bamboos in some cases.Keywords: moso bamboo; quasi-static behavior; tensile behavior; size effect on energy absorption; damage pattern of the multiple bamboo columns; macroscopic tensile fracture mode

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Mechanical Metamaterials and Their Engineering Applications

et al. 2019

Self Cite

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In the past decade, mechanical metamaterials have garnered increasing attention owing to its novel design principles which combine the concept of hierarchical architecture with material size effects at micro/nanoscale. This strategy is demonstrated to exhibit superior mechanical performance that allows us to colonize unexplored regions in the material property space, including ultrahigh strength-to-density ratios, extraordinary resilience, and energy absorption capabilities with brittle constituents. In the recent years, metamaterials with unprecedented mechanical behaviors such as negative Poisson's ratio, twisting under uniaxial forces, and negative thermal expansion are also realized. This paves a new pathway for a wide variety of multifunctional applications, for example, in energy storage, biomedical, acoustics, photonics, and thermal management. Herein, the fundamental scientific theories behind this class of novel metamaterials, along with their fabrication techniques and potential engineering applications beyond mechanics are reviewed. Explored examples include the recent progresses for both mechanical and functional applications. Finally, the current challenges and future developments in this emerging field is discussed as well.

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Asymmetric flexural behavior from bamboo’s functionally graded hierarchical structure: Underlying mechanisms

Cited by 190 publications

References 21 publications

Geometric and material effects on bamboo buckling behaviour

Geometric and material effects on bamboo buckling behaviour

Quasi-Static and Tensile Behaviors of the Bamboos

Mechanical Metamaterials and Their Engineering Applications

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