干燥处理材的动态粘弹性研究

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1、月tf●异很小．干燥处理材和对照材在轴向上的贮存模量随温度升高而降低的程度最小，在径向上次之，在弦向上的降低程度最大。干燥处理材和对照材在轴向的力学损耗峰温度低于木材横向的力学损耗峰温度。弦向上的力学松弛过程的强度最大，轴向上力学松弛过程的强度最小，表明木材弦向表现出更多的粘性性质。(5)干燥处理材和对照材在拉伸形变模式下的贮存模量和损耗模量分别大于在弯曲形变模式下的贮存模量和损耗模量。形变模式的选择对于燥处理材和对照材损耗模量的比较结果以及对轴向力学松弛过程的损耗峰温度有明显的影响。关键词：干燥处理材，动态粘弹性，含水率，各向异性，形变模式一，’‘1。卢}‘AB

2、STRACTDynamicViscoelasticPropertiesforWoodTreatedbyDifferentDryingMethodsJialiJiang(WoodScienceandTechnology)DirectedbyProf．JianxiongLuInordertoinvestigatetheeffectofdryingmethodsonphysicalandmechanicalpropertiesofwood，andprovidetheoreticalbasisandscientificinstructionsfordryingtechni

3、ques，techniquesprocessingandhighlyadditionalvaluematerialsofplantationwood，thedynamicviscoelasticpropertiesofwoodtreatedbyhightemperaturedrying(HTD，115"C)，lowtemperaturedrying(LaD，65。C)andfreezevacuumdrying(FVD)methodswerestudiedrespectivelyinthisstudy．Dynamicviscoelasticpropertiesofw

4、oodtreatedbythreedryingmethodsweTeexaminedundercompletelydriedstate，anddynamicviscoelasticpropertiesofdryingtreatedwoodanduntreatedwoodwerealsoexaminedrespectivelyundervariousequilibriummoisturecontents．Theeffectofwaterondynamicviscoelasticpropertiesofbothdryingtreatedanduntreatedwood

5、werediscussed,andtheapparemactivationenergyoftwomechanicalrelaxationprocesswerecalculated．Thedynamicviscoelasticpropertiesinlongitudinal，radialandtangentialdirectionswerealsoinvestigated，thereasonsfordifferencesamongthreedirectionswereanalysed．Thesamenessanddifferenceofdynamicviscoela

6、sticpropertiesofbothdryingtreatedanduntreatedwoodwerefinallyinvestigatedundersinglecantileverbendingmodeandtensionmode．nlemainresearchresultsaresummarizedasfollows：(1)Thestomgemodulusofdryingtreatedwoodanduntreatedwoodweredecreasedwithtemperatureincreasing，andthistrendwasalmostnotaffe

7、ctedbymoisturecontent，testingfrequency,structuraldirectionandstrainmodeofwood．ThedecreasedextentofstoragemodulusofHTDspecimenswerelowerthanthatoftheothertwodryingtreatedwoodanduntreatedwoodwithtemperatureincreasing，andthedecreasedextentofFVDspecimensweremaximal．Theresultsindicatedthat

8、theri