马尾松、尾赤桉木材蠕变特性常数研究

Creep Characteristic Constants of Woods of Pinus masoniana and Eucalyptus urophylla × camaldulensis

在马尾松 ( Pinusmasoniana )、尾赤桉 ( Eucalyptusurophylla× camaldulensis)板材不同部位以径切面切取小试件各 30枚 ,并各分为 3组 ,分别按材料极限强度的 2 0 %、30 %及 4 0 %进行加载 ,测量木材的蠕变特性曲线 ,确定木材的蠕变特性常数。结果是 :马尾松、尾赤桉抗瞬间弹性变形能力随载荷的增加而增强 ;在相同的载荷下 ,马尾松的抗瞬间弹性变形能力、抗长期粘性蠕变能力及抗延迟弹性蠕变能力均比尾赤桉强 ;应力水平占极限强度比例相同时 ,马尾松的抗瞬间弹性变形能力比尾赤桉强 。

The wood samples collected from tangent planes of lumbers of Pinus masonianaand Eucalyptus urophylla × camaldulensis were used in the stress tests.The creep curves of woods were obtained.For both species,the resistant to instantaneous elastic deformation increases with the increase of loading.At the same load,P masoniana was stronger than E urophylla × camaldulensis in resistant to instantaneous elastic deformation,long term viscous creep and delayed elastic creep.At the same ratio of stress to limit strength,P masoniana has greater resistant to instantaneous elastic deformation than E urophylla × camaldulensis,and was also better than E urophylla × camaldulensis in resistant to long term viscous creep and delayed elastic creep as a whole.