单板条层积材力学性能的预测模型

Prediction model of mechanical properties of parallel strand lumber

以弹性力学能量原理为基础,建立单板条层积材的力学性能预测模型,并采用压制单向薄层复合材料对模型预测值进行验证。验证试验结果表明,与其他常用的几何模型相比,根据能量法建立的模型预测范围更加准确,能量原理得出的预测范围在热压压力小于5 MPa时比较准确。由于完全定向板材的横向搭接长度有限,使得横纹弹性模量的实测值与预测范围偏差较大,但是实际生产板材时,并不存在这种情况,因而在实际生产中模型的预测精度将会提高;而顺纹弹性模量和纵横向剪切模量的预测精度较高。

Based on the elasticity energy principle, the mechanical model of parallel strand lumber was established to forecast the strength of materials. The one-way thin-layer composite material was pressed to verify the correctness of the energy principle predicting scope. The results show that this model can give a high precision of prediction compared with other geometric models. The prediction range has a high precision, especially when the hot pressing is lower than 5 MPa based on the elasticity energy principle. Because of short horizontal lap, the MOE perpendicular to grain was lower than the floor level of prediction range. But in the actual production, this situation hardly existed. The prediction of MOE parallel to grain and aspect shear modulus were well fitted with the testing result.