Compressive Failure Mechanism of Structural Bamboo Scrimber.

Xiangya Luo,Haiqing Ren,Yong Zhong,Xueyu Wang

doi:10.3390/polym13234223

Xiangya Luo, Haiqing Ren + Show 2 more

Open Access

https://doi.org/10.3390/polym13234223

Copy DOI

Abstract

Bamboo scrimber is one of the most popular engineering bamboo composites, owing to its excellent physical and mechanical properties. In order to investigate the influence of grain direction on the compression properties and failure mechanism of bamboo scrimber, the longitudinal, radial and tangential directions were selected. The results showed that the compressive load–displacement curves of bamboo scrimber in the longitudinal, tangential and radial directions contained elastic, yield and failure stages. The compressive strength and elastic modulus of the bamboo scrimber in the longitudinal direction were greater than those in the radial and tangential directions, and there were no significant differences between the radial and tangential specimens. The micro-fracture morphology shows that the parenchyma cells underwent brittle shear failure in all three directions, while the fiber failure of the longitudinal compressive specimens consisted of ductile fracture, and the tangential and radial compressive specimens exhibited brittle fracture. This is one of the reasons that the deformation of the specimens under longitudinal compression was greater than those under tangential and radial compression. The main failure mode of bamboo scrimber under longitudinal and radial compression was shear failure, and the main failure mode under tangential compression was interlayer separation failure. The reason for this difference was that during longitudinal and radial compression, the maximum strain occurred at the diagonal of the specimen, while during tangential compression, the maximum strain occurred at the bonding interface. This study can provide benefits for the rational design and safe application of bamboo scrimber in practical engineering.

Highlights

Bamboo scrimber has become one of the most well-known bamboo engineering products, due to its high raw material utilization rate and good mechanical properties, and it has been widely used in the construction field [7]
For natural bamboo, the compression deformation in the radial direction was much larger than that in the longitudinal direction [21]. This difference was due to the changes in the micro-structure and chemical components of the bamboo scrimber [22]
CoInncolrudseior ntos reveal the influence of grain direction on the compression properties and failureInmoercdhearntoisrmevseoaflbthame ibnoflouescnrciemobfegrr, athinedloirnegctiitoundionnalt,hreacdoimalparnedsstiaonngpernotpiaelrtdieirseacntidons wfaeirleusreelmecetecdha. nMisomresoovfebr,atmhebolooasdc–ridmisbpelra,ctehme elonntgciuturvdeins,acl,ormadpiraelsasniodntapnrogpenertitaielsd,imreacctiroonasnd mwicerroe-fsaeilleucrteedm. oMrpohreoolovgery, tshtreeslosasdta–tdeiaspnldacsetrmaienntfieculdrvwees,recoamnaplryezsesdio. nThperompaeirntiecso,nmclaucsrioons aarendsummicmroa-rfiazieludreasmfoolrlpohwoslo: gy, stress state and strain field were analyzed

Summary

Introduction

Bamboo is an environmentally friendly biological material with superior physical and mechanical properties, which is widely distributed in Asia, America and other places [1,2]. Bamboo has a short growth cycle and can be harvested every 3–5 years. It has been used in the construction field for a long time. Due to its small diameter and hollow structure, the further application of bamboo in the construction field is limited [3]. Some bamboo engineering products, such as bamboo scrimber [4], bamboo laminated timber [5] and bamboo particleboard [6], were explored. Bamboo scrimber has become one of the most well-known bamboo engineering products, due to its high raw material utilization rate (above 90%) and good mechanical properties, and it has been widely used in the construction field [7]

Methods

Results

Conclusion