碳纤维增强桉杨复合胶合板的制备及性能研究
发布时间：2019-07-07 19:45
【摘要】：为开发碳纤维/木基复合材,设计了全桉木、全杨木、杨桉交错、桉杨交错四种结构用桉杨复合胶合板,采用碳纤维(CF)进行表面增强,研究增强前后桉杨复合胶合板的物理力学性能以及保温性能,探讨老化前后四种结构之间的性能变化。结果表明:经碳纤维表面增强后,桉杨交错结构吸水厚度膨胀率为2.6%,下降幅度为44.7%,吸水率下降幅度为46.5%;四种结构浸渍剥离性能均满足标准,最好为桉杨交错结构;桉杨交错结构老化前纵向静曲强度为98.5 MPa,提高率为107.4%,纵向弹性模量为15810 MPa,提高率为129.8%,老化后杨桉交错结构纵向弹性模量为10150 MPa,提高率为176.3%,且杨桉交错结构胶合强度可达1.74 MPa,但对于横向静曲强度、弹性模量和胶合强度提高均较小。综合而言,碳纤维增强后物理力学性能较好的结构为杨桉交错和桉杨交错,总体反映了桉杨复合胶合板结构上纵横强度比差异较大,在实际应用中根据需求调整纵横强度设计比例;经碳纤维表面增强后桉杨复合胶合板导热系数均值为0.44 W/(m·℃),导热系数值接近保温材料,碳纤维表面增强后对其保温性能影响不明显。
[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，
本文编号：2511397
[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，
本文编号：2511397
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