铝-木复合材料抗弯性能预测与分析

Bending performance of wood-aluminum composites:prediction and analysis

将铝合金薄板和定向刨花板(OSB)以层叠方式复合得到新型铝-木复合材料(WAC),对不同组坯的铝-木复合材料抗弯性能进行研究,通过三点弯曲加载试验得到铝-木复合材料弯曲破坏形式和抗弯弹性模量,运用经典层合理论建立抗弯弹性模量预测模型,并进行验证。结果表明:将铝合金薄板叠加在最外层的铝-木复合材料结构荷载能力有很大提高,并且纵向弹性模量(MOE)提高了156.55%,横向弹性模量提高了192.79%。考虑胶层影响,在经典层合模型的基础上对铝-木复合材料的弹性模量进行预测,所得预测值和试验值之间相对误差在10%以内。可见经典层合模型可以很好预测铝-木复合材料的弹性模量,铝-木复合材料有着良好的抗弯性能,将铝合金薄板叠加在最外层的结构是最为合理的。

To research bending behavior of wood-aluminum composites （WAC）and the effect of stacking se-quences, orient strand boards （OSB） were laminated with aluminum alloy sheets by different stacking se- quencesto manufacture WACs. Then, the bending modulus of elasticity （MOE） and bearing capacity of the WAC were determined using a three-point bending test. Next, a prediction model was established from classical laminated plate theory and validated based on the effect of the glue line. Experimental results indicated that WAC with the structure locating the aluminum alloy sheeton the surface showed the best bending performance. The peak load of WAC, which composite the aluminum alloy sheeton the surface, was 2-fold greater than OSB. In contrast with OSB, the bending MOE for the aluminum alloy sheeton the surface increased 156.55% along the parallel and 192.79% along the perpendicular. The model based on classical laminated plate theory was precise enough to aim at a theoretical MOE with relative error of less than 10%. （Ch, 3 fig. 3 tab. 18 ref.）