林业机械与木工设备
林業機械與木工設備
임업궤계여목공설비
FORESTRY MACHINERY & WOODWORKING EQUIPMENT
2014年
2期
41-43,46
,共4页
王希俊%申士杰%赵书平%石泽群
王希俊%申士傑%趙書平%石澤群
왕희준%신사걸%조서평%석택군
机械应力分等%四点平弯%四点侧弯%抗弯强度
機械應力分等%四點平彎%四點側彎%抗彎彊度
궤계응력분등%사점평만%사점측만%항만강도
machine stress rating%four-point flat-wise bending%four-point edge-wise bending,modulus of rupture
采用机械应力分等法对天然林落叶松锯材进行动态弹性模量EMSR测定，依据美国标准ASTM D 4761-05测量其四点平弯与侧弯的弹性模量E4f、E4s和抗弯强度（MOR），并分析EMSR与E4f、E4s、MOR的相关性。结果显示，EMSR与E4f、E4s相关性存在较大差异，且后者高于前者。相关系数分别为0.555、0.681。 E4f、E4s与MOR相关性高于EMSR与MOR的相关性，E4s与MOR的相关性高于E4f与MOR的相关性。实验表明，采用机械应力分等法提高木材分等准确性还需进一步研究。
採用機械應力分等法對天然林落葉鬆鋸材進行動態彈性模量EMSR測定，依據美國標準ASTM D 4761-05測量其四點平彎與側彎的彈性模量E4f、E4s和抗彎彊度（MOR），併分析EMSR與E4f、E4s、MOR的相關性。結果顯示，EMSR與E4f、E4s相關性存在較大差異，且後者高于前者。相關繫數分彆為0.555、0.681。 E4f、E4s與MOR相關性高于EMSR與MOR的相關性，E4s與MOR的相關性高于E4f與MOR的相關性。實驗錶明，採用機械應力分等法提高木材分等準確性還需進一步研究。
채용궤계응력분등법대천연림락협송거재진행동태탄성모량EMSR측정，의거미국표준ASTM D 4761-05측량기사점평만여측만적탄성모량E4f、E4s화항만강도（MOR），병분석EMSR여E4f、E4s、MOR적상관성。결과현시，EMSR여E4f、E4s상관성존재교대차이，차후자고우전자。상관계수분별위0.555、0.681。 E4f、E4s여MOR상관성고우EMSR여MOR적상관성，E4s여MOR적상관성고우E4f여MOR적상관성。실험표명，채용궤계응력분등법제고목재분등준학성환수진일보연구。
Dynamic elastic modulus of Chinese larch (Larix gmelinii) sawn lumber is tested with the machine stress rating method. Based on American standard ASTM D 4761-05, the elastic modulus of its four point flat-wise bending and edge-wise bending E4f,E4s and modulus of rupture (MOR)are measured, with the correlation between E4f,E4s and MOR analyzed. The result shows that there exists a big difference in the correlation between EMSR and E4f&E4 , with the latter higher than the former, with correlation coefficients being 0.555 and 0.681. The correlation between E4f&E4s and MOR is higher than that between EMSRand MOR and the correlation between E4s and MOR is higher than that between E4f and MOR. The experiment shows that the improvement of wood rating accuracy with the machine stress rating method requires further research.
