文献类型：期刊文献

中文题名：周向约束对木材压缩吸能特性的影响

英文题名：Effect of Circumferential Constraint on Wood Compressive Energy Absorption Characteristics

作者：孔静[1] 吕文华[1] 徐诗雨[1] 杨志一[1]

第一作者：孔静

机构：[1]中国林业科学研究院木材工业研究所,北京100091

年份：2024

卷号：52

期号：4

起止页码：129-134

中文期刊名：东北林业大学学报

外文期刊名：Journal of Northeast Forestry University

收录：CSTPCD;;北大核心:【北大核心2023】；CSCD:【CSCD_E2023_2024】；

基金：中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022MA001);国家自然科学基金面上项目(32371805)。

语种：中文

中文关键词：准静态压缩;周向约束;应力-应变曲线;破坏形态;吸能特性

外文关键词：Quasi-static compression;Circumferential constraint;Stress-strain curve;Failure mode;Energy absorption characteristics

分类号：S781;S791.29

摘要：通过准静态压缩试验,考察轻木、泡桐、杉木、毛白杨4种木材在周向约束条件时,顺纹和横纹的压缩力学行为、破坏形态、吸能特性,并利用t检验分析其差异显著性。结果表明:①周向约束木材的顺纹压缩应力-应变曲线仍表现为“三阶段”特征,周向约束可抑制木材剪切扩展、大幅屈曲变形等非稳态破坏,曲线平台阶段应力基本与破坏强度持平。②泡桐、杉木、毛白杨顺纹压缩的吸能能力、平台阶段平稳性显著提高,其单位体积吸能值分别提高了15.51%、53.02%、48.15%,理想吸能率增大了35.93%、24.24%、86.00%。③周向约束木材的径向与弦向压缩力学行为、吸能特性相似,木材压头侧边纤维受试样中部拉伸和剪切作用发生竖向剥离,并沿压缩方向产生裂纹。④与无约束压缩相比,周向约束轻木、泡桐横纹压缩应力-应变曲线形状无明显变化,径向压缩单位体积吸能值分别提高了325.51%、182.60%,弦向压缩单位体积吸能值分别提高了430.57%、255.66%;杉木、毛白杨周向约束时横纹压缩应力-应变曲线变为无平台区的“两阶段”形式,理想吸能率均显著降低。
Through quasi-static compression tests,the compressive mechanical behavior,failure modes,and energy absorption characteristics of four types of wood,including Ochroma pyramidalea,Paulownia fortunei,Cunninghamia lanceolata and Populus tomentosa,under circumferential constraint conditions were investigated,and the significant differences were analyzed by t-test.The results showed that:①The stress-strain curve of longitudinal compression of wood under circumferential constraint still exhibited a“three-stage”characteristic,with circumferential constraint inhibiting shear extension and large buckling deformation,and the stress in the plateau stage was basically equal to the failure strength.②The energy absorption capacity and stability in the plateau stage of Paulownia fortunei,Cunninghamia lanceolata and Populus tomentosa under longitudinal compression were significantly improved,with the specific energy absorption values per unit volume increasing by 15.51%,53.02%,and 48.15%,respectively,and the ideal energy absorption rates increasing by 35.93%,24.24%,and 86.00%.③The radial and tangential compression mechanical behavior and energy absorption characteristics of wood under circumferential constraint were similar,with the fibers on the compression side of the wood sample experiencing vertical delamination due to tension and shear in the middle,and cracks forming along the compression direction.④Compared to unconstrained compression,the shape of the stress-strain curve of tangential compression of Ochroma pyramidalea and Paulownia fortunei under circumferential constraint showed no significant changes,with the specific energy absorption values per unit volume increasing by 325.51%and 182.60%for radial compression,and by 430.57%and 255.66%for tangential compression of Cunninghamia lanceolata and Populus tomentosa,the stress-strain curve of tangential compression under circumferential constraint changed to a“two-stage”form without a plateau region,and the ideal energy absorption rates significantly decreased for Cunninghamia lanceolata and Populus tomentosa.