基于数字散斑相关方法的竹材变形特性

Deformation Behavior of Bamboo based on DSCM

利用数字散斑相关方法(DSCM)测定5个竹龄的竹材顺纹抗拉弹性模量,并实时拍摄竹材拉伸和压缩过程中的位移变化,得出竹材抗拉和抗压试样的应变场。结果表明:从竹青至竹黄,顺纹抗拉弹性模量大致呈减小的趋势;随着竹龄的增大,顺纹抗拉弹性模量逐渐增加。竹材破坏过程复杂且能够直观地反映破坏的全过程,与人们肉眼观察相比,DSCM可提前反映试样状态并预见试样的破坏点。

Digital speckle correlation method（DSCM）was used in studying modulus of elasticity（MOE）in tension parallel to grain of bamboo and displacements which contribute to the strain fields of samples during the tension and compressive process. It was showed the MOE in tension parallel to grain kept a decreasing trend from the outer to inner layers of stalks, and it increased with age increasing. Besides, bamboo damage was complex and the whole damage process could be reflected by DSCM intuitively. In addition,DSCM could show the damage state of samples in advance and anticipate failure sites.