APPLICATION OF DIGITAL SPECKLE CORRELATION METHOD FOR EXAMINING DEFORMATION BEHAVIOUR OF MOSO BAMBOO (PHYLLOSTACHYS PUBESCENS)

We studied the deformation behaviour of bamboo under loading. Modulus of elasticity (MOE) in tension parallel to grain with respect to age, damage behaviours during tension and compression loading of moso bamboo (Phyllostachys pubescens) were recorded via digital speckle correlation method (DSCM). DSCM could be successfully used in determining MOE because the differences in results compared with those obtained using conventional extensometer were within 5%. MOE in tension parallel to grain obtained by DSCM maintained an increasing trend with increasing age. During the tension and compression processes, samples had large strain concentrations and gradients before damage. Since DSCM could be used in advance for reflecting damage behaviours and predicting failure site, it was possible to show the whole complex damage process.