尾巨桉/金属复合材料层间剪应力分布特征的有限元解析

Finite element analysis of interlayer shear stress distribution of laminated eucalyptus veneer/steel plate composite board

利用三层尾巨桉单板之间嵌入与两张性能相同的金属薄板组成五层尾巨桉单板/金属网层积复合材,并采用预实验优化的热压工艺参数压制成板。采用大型通用有限元分析软件ANSYS 10.0建立了尾巨桉/金属网复合材料的有限元分析模型,模拟了尾巨桉/金属复合材料界面自由边附近与板材内部界面剪切应力分布规律,确定了最可能引起分层破坏的剪切应力的分布规律。结果表明:(1)复合材料四层界面处3个剪切应力的二维应力场分布云图表明自由边附近出现奇异应力的分布特征,自由边处剪切应力τxy的值最大,其最大值为14.0MPa;(2)复合材料四层界面处3个剪切应力的三维应力场分布云图表明在四层界面处剪切应力τxy的应力集中现象都最为明显,最大应力集中值可达25.0 MPa。

The laminated eucalyptus veneer/steel plate composite board was made of three layers eucalyptus veneer（each thicks 2.2 mm） and two layers thin steel plate（each thicks 0.5 mm） which were inlayed between two veneers,by adopting the hot-pressing technology with the parameters optimized throught pre-experiments.A finite element model for the interlayer shear stresses distribution of laminated board was built up by means of the analysis software of ANSYS 10.0.With the model,the distribution law of the interlayer stear stresses at the interfaces free edges nearby and the internal interfaces was simulated,and the most probable interlayer shear stress that caused the composite board delimination failure was found out.The results show that（1） the distribution nephogram of the two-dimensional stress field of the three shear stresses in the four interfaces of the board indicated that there was a distribution of singular stresses near the free edges,and the maximum stress value was 14.0 MPa;（2） the distribution mephogram of the three-dimensional stress field of the three shear stresses in the four interfaces revealed that the phenomenon of shear stresses con centration was most obvious in the four interfaces,and the maximum stress concentraion value was up to 25.0 MPa.