PREDICTED MODEL OF SECTION STRESS DISTRIBUTION AND BENDING STRENGTH OF FIBERBOARD BASED ON VERTICAL DENSITY PROFILE
To study the impact of VDP on the bending process of fiberboard, this paper deeply researched into the dynamic changes of section stress distribution of fiberboard during the process of loading and bending and built a static bending strength predicting model, which is based on the piecewise function by simulating fiberboard VDP, theory of elasticity and plasticity, lamella inter-bedded theory and VDP model. The results show: The bending process of fiberboard can be divided into two stages which are elasticity period and elasticity-plasticity period. The latter includes both elasticity region and plasticity region, and compression region comes to elasticity bending before pulling region. The curve of bending section stress distribution is nonlinear and affected by loads and VDP. Critical section stress distribution of bending breakage and breakage load can be predicted by VDP with other condition unchanged. The value of static bending strength predicted by model is basically consistent with testing data. And the static bending strength is closely related to qualification factors of VDP. Fiberboard with high average density doesn’t always contain high static bending strength. VDP is a significant physical parameter which has impact on the bending process and performance of fiberboard, so it must be optimized and controlled in production according to for specific purpose.
Yang Zhang Zhiming Yu Wanzhao Li
Department of wood science and technology Beijing Forestry University Qinghua east road 35,Haidian district 100083,Beijing,China
国际会议
桂林
英文
1-12
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）