DOI:10.11929/j.swfu.202208049引文格式:李猛,佘艳华,贺才豪,等.不同温度下的柏木构件顺纹压缩损伤规律研究[J].西南林业大学学报(自然科学),2023,43(5):153–163.不同温度下的柏木构件顺纹压缩损伤规律研究李猛佘艳华贺才豪何佳明陈迪(长江大学城市建设学院,湖北荆州434023)摘要:为准确判定木构件损伤断裂时裂纹萌生规律,有效评估木材损伤程度,本试验以绝干后的柏木构件为研究对象,利用声发射技术和数字图像系统进行原位检测。通过分析声发射参数变化和裂纹表面区域应变曲线变化特征,探究不同温度下木材裂纹的萌生规律以及起裂荷载。结果表明:在120、140、160、180℃温度下的柏木构件极限均荷载下降幅度分别为16.2%、6.8%、66.4%;结合声发射参数数据对应的荷载值与DIC损伤云图可以分析木构件在初始破坏阶段的起裂荷载分别为125、62、40、32kN。可见,温度越高木材极限荷载和起裂荷载越低,温度对木材力学退化性能影响明显。关键词:木构件;高温;声发射;数字图像相关法;起裂荷载中图分类号:S781文献标志码:A文章编号:2095−1914(2023)05−0153−11StudyonCompressionDamageLawofCypressUnderDifferentTemperaturesLiMeng,SheYanhua,HeCaihao,HeJiaming,ChenDi(SchoolofUrbanConstruction,YantzeUniversity,JingzhouHubei434023,China)Abstract:Inordertoaccuratelydeterminethecrackinitiationlawofwoodcomponentduringdamageandfractureandeffectivelyevaluatethedegreeofwooddamage,inthisexperiment,cypresscomponentsunderdiffer-enttemperatureenvironmentsweretakenastheresearchobject.Itwasusedtoin-situdetectthecompressiondam-ageevolutionofcypresscomponentsatdifferenttemperaturebyacousticemissiontechonlogyanddigitalimagesystem.Byanalyzingthechangeofacousticemissionparametersandthestraincurveofthecracksurfacearea,thecrackinitiationlawandcrackinitiationloadofwoodatdifferenttemperatureswereexplored.Theresultsshowedthatthedecreaseinultimatemeanloadofcypressmembersat120,140,160and180℃were16.2%,6.8%and66.4%,respectively;theloadvaluecorrespondingtotheacousticemissionparameterdataandtheDICdamageclouddiagramcanbeusedtoanalyzethatthecrackinitiationloadofcypresscomponentatthecrackiniti-ationstageis125,62,40and32kNrespectively.Itwasshowthatthehigherthetemperature,th...