西北林学院学报2013，Vol.28Issue(2)：173-177,5.DOI:10.3969/j.issn.1001-7461.2013.02.34
红锥木材蠕变特性研究
Creep Characteristics of Castanopsis hystrix Wood
摘要
Abstract
By means of the 4-point loading method on the horse of Castanopsis hystrix wood samples, a short-term (420 min) bending creep test was conducted to obtain bending creep characteristic curve, and then to determine the viscoelastic element constants. The relationship between the creep and the stress level within the strength limitation of the wood was also examined. When the bending stress was σb 20%,the related constants were J0 (instantaneous elastic compliance):7. 101×10-7 cm2 /N,η0 (viscosity coefficient); 573. 604×10-7 min·N/cm2,and ∑J,(delayed elastic compliance):0. 694×10-7 cm2/N. When the bending stress was σb 30%,J0:6. 356×10-7cm2,η0: 513. 636×10-7 min·N/cm2,and ∑ Ji:0. 972 × 10-7 cm2/N. When the bending stress was σb 40%,Jo:8.408× 10-7 cm2/N, η0: 436. 293 ×10-7 min·N/cm2,and ∑Ji 0. 784×10-7 cm2/N. It was concluded that with the increase of stress level, J0 and the∑Ji fluctuated, when the stress level was in the middle (σb 30% ),the value of J0 was low,and ∑Ji was high. Viscosity coefficient η0 decreased step by step when the stress level increased,the reduction amplitude between the interstage creased by 10. 43% and 15. 06%, respectively, indicating that C. Hystrix creep resistant ability droped quickly under the higher stress level.关键词
红锥/木材/蠕变特性/电测法Key words
Castanopsis/ hystrix/ wood/ creep characteristic/ electric measuring method分类
农业科技引用本文复制引用
刁海林,罗建举,蔡道雄..红锥木材蠕变特性研究[J].西北林学院学报,2013,28(2):173-177,5.基金项目
广西林业重大招标项目"主要速生人工林树种材性改良与深加工利用"(桂林科字[2009]第7号). （桂林科字[2009]第7号）
