动态和静态测试定向刨花板的泊松比

doi:10.11707/j.1001-7488.20210815

摘要/Abstract

摘要：

目的: 探讨悬臂板一阶弯曲模态法（动态法）和悬臂板静力弯曲法（静态法）测试定向刨花板（OSB）纵向和横向泊松比的适用性，给出动态法测试OSB纵向和横向泊松比的贴片位置。方法: 应用ANSYS模态程序块和静力弯曲程序块对OSB悬臂板进行动、静态应力和应变分析，计算长宽比3~6、宽厚比4~10的OSB纵向和横向悬臂板的应力和应变；确定悬臂板内横向应力等于零的位置，即动态和静态测试OSB纵向和横向泊松比的应变片粘贴位置，并应用二元回归分析将其表示为依赖于悬臂板试件长宽比和宽厚比的关系式。结果: 对于国产和加拿大产OSB，动态测试的纵向泊松比分别为0.342和0.314，横向泊松比分别为0.131和0.174；动态和静态测试OSB泊松比的贴片位置虽不同，但测试出的泊松比较为一致。结论: 悬臂板一阶弯曲模态法和悬臂板静力弯曲法适用于测试OSB纵向和横向泊松比，其有效性得到轴向拉伸法和四点弯曲法的验证。

关键词: 定向刨花板, 泊松比, 动态, 静态

Abstract:

Objective: This study was carried out to discuss the applicability of cantilever plate first-order bending mode method (dynamic method) and cantilever plate static bending method (static method) to test the longitudinal and horizontal Poisson's ratio of oriented strand board (OSB). Method: The dynamic and static stress and strain analysis of OSB cantilever plates were carried out using ANSYS modal program block and static bending program block, and the OSB longitudinal and horizontal cantilevers with an aspect ratio of 3 to 6 and a width to thickness ratio of 4 to 10 were calculated. The stress and strain of the plate, the position where the horizontal stress in the cantilever plate being equal to zero was determined, that is, the position of the strain gauges for dynamic and static tests of OSB longitudinal Poisson's ratio and horizontal Poisson's ratio, and the binary regression analysis was applied to express it as dependent on the relationships between the width to length ratio and the thickness to width ratio of the cantilever plate specimen. Result: For the OSB made in China and Canada, the longitudinal Poisson's ratios of the dynamic test were 0.342 and 0.314, and the horizontal Poisson's ratios were 0.131 and 0.174, respectively. The patch positions of the dynamic and static OSB Poisson's ratios were different, but it could test a fairly consistent OSB Poisson's ratio. Conclusion: The first-order bending mode method of the cantilever plate and the static bending method of the cantilever plate might be suitable for testing the longitudinal and horizontal Poisson's ratio of OSB, and their effectiveness could be verified by the axial tension method and the four-point bending method.

Key words: oriented strand board(OSB), Poisson's ratio, dynamic, static

中图分类号:

S781.2

王正,黄俣劼,许斌,丁叶蔚,张一凡,何宇航,周宇昊. 动态和静态测试定向刨花板的泊松比[J]. 林业科学, 2021, 57(8): 147-156.

Zheng Wang,Yujie Huang,Bin Xu,Yewei Ding,Yifan Zhang,Yuhang He,Yuhao Zhou. Dynamic and Static Testing of Poisson's Ratio of Oriented Strand Board[J]. Scientia Silvae Sinicae, 2021, 57(8): 147-156.

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材质 Material	密度Density/(kg·m^-3)	方向 Direction	E_x/GPa	E_y/GPa	E_z/GPa	μ_xy	μ_yz	μ_xz	G_xy/GPa	G_yz/GPa	G_xz/GPa
OSB	650	纵向Longitudinal	6.34	2.41	2.41	0.34	0.13	0.13	1.20	0.4	0.4
OSB	650	横向Horizontal	2.41	6.34	2.41	0.13	0.34	0.13	1.20	0.4	0.4

方向 Direction	悬臂板一阶弯曲模态法 Cantilever plate first-order bending mode method	悬臂板静力弯曲法 Cantilever plate static bending method	轴向拉伸法 Axial tension method	四点弯曲法 Four-point bending method
纵向Longitudinal	0.342 (26.6%)	0.346 (25.8%)	0.321 (28.8%)	—
横向Horizontal	0.131 (32.6%)	0.126 (30.3%)	—	0.122 (36.7%)

方向 Direction	悬臂板一阶弯曲模态法 Cantilever plate first-order bending mode method			四点弯曲法 Four-point bending method
纵向 Longitudinal	l/b=5.1, 贴片Patch x/l=0.41	l/b=4.4, 贴片Patch x/l=0.44	l/b=3.4, 贴片Patch x/l=0.47	0.318(26.0%)
纵向 Longitudinal	0.308(23.1%)	0.314(23.4%)	0.319(25.1%)	0.318(26.0%)
横向 Horizontal	l/b=3.9, 贴片Patch x/l=0.36	l/b=3.3, 贴片Patch x/l=0.40	—	0.170(32.0%)
横向 Horizontal	0.173(25.5%)	0.174(25.0%)	—	0.170(32.0%)

OSB生产地 OSB production place	方向 Direction	悬臂板一阶弯曲模态法 Cantilever plate first-order bending mode method	悬臂板静力弯曲法 Cantilever plate static bending method	验证性试验 Confirmatory test
国产 Domestic	纵向Longitudinal	0.342(26.5%)	0.346(25.8%)	0.321(28.8%)(轴向拉伸法 Axial tension method)
国产 Domestic	横向Horizontal	0.131(32.6%)	0.126(30.3%)	0.122(36.7%)(四点弯曲法 Four-point bending method)
加拿大Canadian	纵向Longitudinal	0.314(23.4%)	—	0.318(26.0%)(轴向拉伸法 Axial tension method)
加拿大Canadian	横向Horizontal	0.174(25.0%)	—	0.170(32.0%)(四点弯曲法 Four-point bending method)

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