中文摘要：

目的研究木材能量吸收特性。方法采用横纹压缩试验。结果径向横压应力-应变曲线呈现线弹性区、平台区和密实化区等3个阶段,径向横压比例极限大于弦向。当绝对含水率为13.1%、径向横压应变为0.55时,能量吸收值和缓冲系数分别为3.919 MJ·m3和2.847。当绝对含水率为13.1%、弦向横压应变为0.11时,吸收能量值和缓冲系数仅为0.472 MJ·m3和12.746,且木材已压溃失效。随着绝对含水率的下降,横纹压缩强度、吸能能力和径向横压最大吸能效率均呈上升趋势,最大横纹压缩强度、能量吸收值和径向吸能效率分别为10.15 MPa,4.430 MJ·m3和0.362%,而弦向横压时吸能效率呈下降趋势。结论木材绝对含水率和纹理方向对木材能量吸收有一定影响。

英文摘要：

Objective To investigate the energy absorption capacity of hard pine wood with different moisture content. Methods Across-compression tests were carded out. Results The radial across-compressive stress-strain curve of hard pine was composed of three stages, which were linear elasticity region, platform region and densification region. The proportional limit stress of radial across-compression was higher than that of tangential across-compression. When the absolute moisture content was 13.1%, the energy absorption capacity of radial across-compression and cushioning coefficient were 3.919 MJ ~ m3 and 2.847 at 0.55 strain, respectively. The energy absorption capacity of tangential across-compression and cushioning coefficient were only 0.472 MJ. m3 and 12.746 at 0.11 strain, respectively. Meanwhile, the wood was completely destroyed. When the absolute moisture content decreased, the across-compressive stress, energy absorption capacity and maximum energy absorption efficiency of radial across-compression were increased. The maximum across-compression strength, energy absorption capacity and energy absorption of radial across-compression were 10.15 MPa, 4.430 MJ- m3 and 0.362%, respectively. However, the energy absorption efficiency of tangential across-compression was decreased when the moisture content decreased. Conclusion The energy absorption capacity of wood was influenced by the absolute moisture content and the direction of wood grain.