【摘要】：為開發(fā)碳纖維/木基復(fù)合材,設(shè)計(jì)了全桉木、全楊木、楊桉交錯(cuò)、桉楊交錯(cuò)四種結(jié)構(gòu)用桉楊復(fù)合膠合板,采用碳纖維(CF)進(jìn)行表面增強(qiáng),研究增強(qiáng)前后桉楊復(fù)合膠合板的物理力學(xué)性能以及保溫性能,探討老化前后四種結(jié)構(gòu)之間的性能變化。結(jié)果表明:經(jīng)碳纖維表面增強(qiáng)后,桉楊交錯(cuò)結(jié)構(gòu)吸水厚度膨脹率為2.6%,下降幅度為44.7%,吸水率下降幅度為46.5%;四種結(jié)構(gòu)浸漬剝離性能均滿足標(biāo)準(zhǔn),最好為桉楊交錯(cuò)結(jié)構(gòu);桉楊交錯(cuò)結(jié)構(gòu)老化前縱向靜曲強(qiáng)度為98.5 MPa,提高率為107.4%,縱向彈性模量為15810 MPa,提高率為129.8%,老化后楊桉交錯(cuò)結(jié)構(gòu)縱向彈性模量為10150 MPa,提高率為176.3%,且楊桉交錯(cuò)結(jié)構(gòu)膠合強(qiáng)度可達(dá)1.74 MPa,但對(duì)于橫向靜曲強(qiáng)度、彈性模量和膠合強(qiáng)度提高均較小。綜合而言,碳纖維增強(qiáng)后物理力學(xué)性能較好的結(jié)構(gòu)為楊桉交錯(cuò)和桉楊交錯(cuò),總體反映了桉楊復(fù)合膠合板結(jié)構(gòu)上縱橫強(qiáng)度比差異較大,在實(shí)際應(yīng)用中根據(jù)需求調(diào)整縱橫強(qiáng)度設(shè)計(jì)比例;經(jīng)碳纖維表面增強(qiáng)后桉楊復(fù)合膠合板導(dǎo)熱系數(shù)均值為0.44 W/(m·℃),導(dǎo)熱系數(shù)值接近保溫材料,碳纖維表面增強(qiáng)后對(duì)其保溫性能影響不明顯。
[Abstract]:In order to develop carbon fiber / wood based composites, eucalyptus composite plywood, all poplar interlaced and eucalypt interlaced were designed. Carbon fiber (CF) was used to strengthen the surface of eucalyptus composite plywood. The physical and mechanical properties and thermal insulation properties of eucalyptus composite plywood before and after strengthening were studied, and the changes of properties between the four structures before and after aging were discussed. The results showed that the water absorption thickness expansion rate of eucalyptus staggered structure was 2.6%, the decrease range was 44.7%, and the water absorption rate decreased by 46.5%, and the dipping and peeling properties of the four structures met the standard, and the best one was eucalyptus staggered structure. Before aging, the longitudinal static bending strength and longitudinal elastic modulus of eucalyptus staggered structure were increased by 107.4% and 15810 MPa, respectively. After aging, the longitudinal elastic modulus of Eucalyptus grandis staggered structure was increased by 176.3%, and the bonding strength of Eucalyptus eucalyptus staggered structure reached 1.74 MPa, but the increase of elastic modulus and bonding strength was small for transverse static bending strength. To sum up, the structures with good physical and mechanical properties after carbon fiber reinforcement are eucalyptus and eucalyptus interlaced, which generally reflects the great difference of longitudinal and transverse strength ratio on eucalyptus composite plywood structure, and adjusts the design ratio of longitudinal and transverse strength according to the demand in practical application. The average thermal conductivity of eucalyptus composite plywood strengthened by carbon fiber surface is 0.44 W / (m 路鈩，

本文編號(hào)：2511397