静态径向加载速率对樟子松吸能特性的影响

Impact of Radial Static Loading Rate on the Scotch Pine Energy Absorption Characteristics

目的研究樟子松在不同静态径向加载速率作用下的能量吸收特性。方法采用横纹径向压缩实验。结果在不同加载速率的作用下,应力-应变曲线都呈现出3个阶段,即弹性阶段,应力平台阶段以及密实化阶段。樟子松存在明显的应变速率敏感性,随着加载速率的增加,应力-应变曲线的应力平台阶段不断上升。当应变为0.06,加载速率为1 mm/min时,应力为4.38 MPa;当加载速率为10和30mm/min时,对应的应力分别为4.71和6.56 MPa。樟子松具有优良的吸能能力,其能量吸收效率可以达到0.7~0.8。其缓冲系数曲线呈＂L＂型,随着应变的增加缓冲系数不断减小,但受加载速率的影响不大。结论不同加载速率对樟子松的能量吸收特性有一定的影响。

This work aimed to study the Scotch pine energy absorption characteristics under the effect of different radial Static loading rate. Across-compression radial tests were carried out. Under different loading rates, the stress-strain curves showed three stages： elastic stage, stress stage and densification stage. There was obvious strain rate sensitivity of Scotch pine, with the increase of loading rate, the plateau stage of stress-strain curves rose gradually. At the strain rate of 0.06, the loading rate was 1 mm/min, the stress was 4.38 MPa; When the loading rates was 10 mm/min and 30 mm/min, the corresponding stress was 4.71 MPa and 6.56 MPa, respectively. Scotch pine had excellent energy absorption capacity, the energy absorption efficiency of samples could reach 0.7~0.8. The cushioning coefficient curves of the samples were ＂L＂ type, and the cushioning coefficient curves decreased with the increase of the strain, but the load rate had little effect. The energy absorption capacity of wood was influenced by different loading rates.