Papers by Keyword: Flexural Characteristics

Abstract: A novel kind of parallel strand lumber (PSL) was produced, in which bamboo slivers with viscoelastic deformation were mixed with poplar veneer strands at a weight ratio of 1:4 as raw materials, then the flexural characteristics of PSL were investigated. The results showed that stretching treatment was an effective method to generate viscoelastic deformation of bamboo slivers, which would induce prestress in the bamboo slivers, reinforced PSL. The modulus of rupture (MOR) and modulus of elasticity (MOE) of prestressed bamboo slivers reinforced PSL were 7.84% and 11.76% higher than that of control PSL respectively. The flexural toughness index of prestressed bamboo slivers reinforced PSL was increased by 27.55% compared with control PSL. The presence of prestress in bamboo slivers reinforced PSL significantly enhanced its flexural stiffness and toughness, while it had no obvious effect on its flexural strength.

Abstract: Flexural motion of a cantilever bar can be used to monitor the taper angle measurements of the bar without incorporating any geometric measurement. This provides non-destructive taper measurement with fast processing in manufacturing line. The laser ablation of a free end of the cantilever bar enables to generate a recoil pressure at the irradiated surface while resulting in external forcing function for the initiation of the flexural motion. Consequently, in the present study, laser induced ablation of free end tapered cantilever bar and resulting displacement and frequency of the flexural motion is examined. The study is extended to include influence of positive and negative bar taper angles on the flexural characteristics. In addition, deviation of displacement and frequency of the flexural motion due to tapered bar from the parallel bar is examined. It is found that the flexural characteristics of the tapered bar enable to determine taper angle of the bar with high accuracy.