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首页> 外文期刊>Wood Science and Technology >Mill variation in bending strength and stiffness of in-grade southern pine No. 2 2×4 lumber
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Mill variation in bending strength and stiffness of in-grade southern pine No. 2 2×4 lumber

机译：等级2的2×4级南松木材的弯曲强度和刚度的轧机变化

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摘要

Visually graded southern pine (SP) has wide variability within grade. For 2×4 lumber, this variability has increased because it is harvested from both natural forests and plantation forests where trees contain high percentages of juvenile wood. To investigate resource variability, six kiln-dried No. 2 2 × 4 SP packages were acquired from six mills. From each package, 124 samples were destructively tested in bending. Mean modulus of elasticity (MOE_(15)) ranged from 9.2 to 13.1 GPa, and three mills did not meet the design values (11.0 GPa). Bending strength (F_b) ranged from 7.6 to 11.9 MPa, and four mills did not meet the design values (10.3 MPa). Analysis of variance of MOE_(15) and F_b showed significant differences between mills. MOE_(15) explained from 33 to 51 ％ of the variability in F_b. These data suggest that variation between mills is high and destructive testing is critical for more accurate characterization of lumber properties.
机译：视觉上分级的南方松（SP）在等级内变化很大。对于2×4木材，这种变异性增加了，因为它是从天然林和人工林采伐的，其中树木中幼木的比例很高。为了调查资源的可变性，从六个工厂购买了六个窑干的2 2×4 SP包装。从每个包装中，对124个样品进行了破坏性的弯曲测试。平均弹性模量（MOE_（15））介于9.2至13.1 GPa之间，并且三台轧机不符合设计值（11.0 GPa）。弯曲强度（F_b）在7.6至11.9 MPa之间，四台轧机不满足设计值（10.3 MPa）。 MOE_（15）和F_b的方差分析显示，轧机之间存在显着差异。 MOE_（15）解释了F_b从33％到51％的变化。这些数据表明，工厂之间的差异很大，而破坏性测试对于木材特性的更准确表征至关重要。

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  • 来源
    《Wood Science and Technology》 |2013年第6期|1153-1165|共13页
  • 作者

    Joseph Dahlen; P. David Jones; R. Daniel Seale; Rubin Shmulsky;

  • 作者单位

    Wamell School of Forestry and Natural Resources, University of Georgia, 180 E Green Street, Athens, GA 30602-2152, USA;

    Department of Forest Products, Mississippi State University, Mail Stop 9820, Mississippi State, MS 39759, USA;

    Department of Forest Products, Mississippi State University, Mail Stop 9820, Mississippi State, MS 39759, USA;

    Department of Forest Products, Mississippi State University, Mail Stop 9820, Mississippi State, MS 39759, USA;

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