Measuring modulus of elasticity of full-size wood composite panels using vibration method

GUAN Cheng; ZHOU Lujing; ZHANG Houjiang; LIN Wei

doi:10.11833/j.issn.2095-0756.2016.06.020

Volume 33 Issue 6

Nov. 2016

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GUAN Cheng, ZHOU Lujing, ZHANG Houjiang, LIN Wei. Measuring modulus of elasticity of full-size wood composite panels using vibration method[J]. Journal of Zhejiang A&F University, 2016, 33(6): 1067-1072. doi: 10.11833/j.issn.2095-0756.2016.06.020

Citation:

GUAN Cheng, ZHOU Lujing, ZHANG Houjiang, LIN Wei. Measuring modulus of elasticity of full-size wood composite panels using vibration method[J]. Journal of Zhejiang A&F University, 2016, 33(6): 1067-1072. doi: 10.11833/j.issn.2095-0756.2016.06.020

Measuring modulus of elasticity of full-size wood composite panels using vibration method

doi: 10.11833/j.issn.2095-0756.2016.06.020

1.
School of Technology, Beijing Forestry University, Beijing 100083, China
2.
Krono(Beijing) Wood Panels Co., Ltd., Beijing 100068, China

Received Date: 2015-11-30
Rev Recd Date: 2016-05-09
Publish Date: 2016-12-20

Abstract

In order to detect the modulus of elasticity of full-size wood composite panels non-destructively, this research presents a test method based on the transverse free vibration of thin plate. A laboratory testing apparatus for measuring mechanical performance of full-size panels was built. Two hundred and six pieces of full-size wood composite panels including eighty-six pieces of particleboard panels and one hundred and twenty pieces of plywood panels were tested. Following free vibration testing, six small specimens were cut from each panel and traditional static mid-point bending test was then performed on each specimen to obtain static MOE. Then, the test results of two methods were compared. The results indicated that:all the full-size wood composite panels as the research object, the dynamic MOE of full-size panels by vibration method was slightly higher than their static MOE and their ratio were in the range of 1.03-1.22; a highly significant correlation relationship (P<0.001) was found between dynamic MOE and static MOE of full-size panels,which proved that determination of modulus of elasticity of full-size wood composite panels based on the transverse free vibration of thin plate was feasible.[Ch, 5 fig. 4 tab. 19 ref.]
- wood science and technology,
- full-size wood composite panel,
- modulus of elasticity (MOE),
- transverse vibration of thin plate,
- "free-free" supporting,
- measuring

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References

[1]	DÜNDAR T, AS N, AKKILIÇH. The prediction of mechanical properties of wood-based composites with vibration NDE method[J]. J Fac For Istanbul Univ, 2008, 58(2):43-59.
[2]	COPPENS H. Quality control of particleboards by means of their oscillation behavior[C]//Proceedings of FESYP Technical Conference. Munich:European Federation of Associations of Particleboard Manufactures, 1988:143-165.
[3]	McNATT J D, WELLWOOD R W, BACH L. Relationships between small-specimens and large panel bending tests on structural wood-based panels[J]. For Prod J, 1990, 40(9):10-16.
[4]	SHYAMASUNDER K, ASWATHANARAYANA B S, NAIDU M V. Nondestructive evaluation of modulus of elasticity and modulus of rigidity of plywood by sonic methods[C]//PELLERIN R F, MCDONALD K A. Proceedings of the 9th International Symposium on Nondestructive Testing of Wood. Madison:Forest Products Society, 1994:113-116.
[5]	SHI Bozhong, CAI Zhiyong. Nondestructive evaluation of full-sized particleboard panels using the vibration technique[C]//PELLERIN R F, MCDONALD K A. Proceedings of the 9th International Symposium on Nondestructive Testing of Wood. Madison:Forest Products Society, 1994:117-122.
[6]	LARSSON D. Stiffness characterization of wood based panels by modal testing[C]//SANDOZ J L, PELLERIN R F, MCDONALD K A. Proceedings of the 10th International Symposium on Nondestructive Testing of Wood. Lausanne:IBOIS-Chair of Timber Construction of the Swiss Federal Institute of Technology, 1996:237-246.
[7]	LAU P W, TARDIF Y. Evaluation of Moduli of Elasticity and Rigidity of Panel Products by Torsional-Bending Vibration[R]. Edmonton:Canadian Forest Service, 1996.
[8]	SCHULTE M, FRÜHWALD A, BRÖKER F W. Non-destructive testing of panel products by vibration technique[C]//SANDOZ J L, PELLERIN R F, McDONALD K A. Proceedings of the 10th International Symposium on Nondestructive Testing of Wood. Lausanne:IBOIS-Chair of Timber Construction of the Swiss Federal Institute of Technology, 1996:259-268.
[9]	MIRBOLOUK P, ROOHNIA M. Evaluation of dynamic modulus of elasticity of medium density fiberboard panel from longitudinal vibration tests on specimens[J]. BioResources, 2015, 10(1):613-621.
[10]	GAO Yanqiu, WANG Zhaowu, ZHANG Qisheng. Analysis of measuring error on TMJ-a nondestructive testing equipment for structural board[J]. China Wood Ind, 2002, 16(5):24-26.
[11]	ZHOU Haibin, REN Haiqing, FEI Benhua, et al. Dynamical test on flexural and shear modulus of composite wood panels[J]. J Build Mater, 2007, 10(5):561-565.
[12]	ZHOU Lujing, ZHANG Houjiang, GUAN Cheng, et al. Analysis of vibration modal testing for the full-size artificial board[J]. J Mult, 2014, 9(6):816-821.
[13]	GUAN Cheng, ZHOU Lujing, ZHANG Houjiang. Analysis of the vibration modal of the full-sized medium density fiberboard[J]. J Northwest For Univ, 2015, 30(3):228-233.
[14]	ZHOU Jianhui, CHUI Y H. Influence of boundary conditions on measurement of elastic constants of engineered wood-based panels using modal testing[C]//ROSS R J, GONÇALVES R. Proceedings of the 19th International Symposium on Nondestructive Testing of Wood. Rio de Janeiro:Forest Products Society, 2015:321-332.
[15]	ZHANG Houjiang, ZHOU Lujing, WU Jiang. Nondestructive full-scale artificial board elasticity modulus and dynamic viscoelasticity testing device and method:CN103439251A[P]. 2013-12-11.
[16]	GUAN Cheng, ZHANG Houjiang, ZHOU Lujing, et al. Detection on dynamic viscoelasticity of full-size wood composite panels[J]. J Nanjing For Univ Nat Sci Ed, 2015, 39(6):131-136.

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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足尺人造板是指人造板生产和销售中最常见的幅面为2.44 m × 1.22 m标准尺寸的成品人造板。在足尺人造板的力学性能指标中，弹性模量（MOE）是最有代表性的指标之一，因为它与静曲强度（MOR）等其他主要力学性能指标间存在着统计上的线性关系^[1]。目前，足尺人造板弹性模量的测定方法是根据国家标准从板材不同部位截取数个小试件在力学试验机上进行弯曲实验，再根据小试件的平均值评价足尺板材的弹性模量。这种方法属于有损检测，成本高，检测效率低，只适于产品的抽检，只能在实验室环境中进行。如何找到一种快速、无损检测足尺人造板弹性模量的方法是人造板行业亟须解决的一个问题。20世纪80年代以来，国外的研究人员利用声发射、应力波和模态测试等技术对足尺人造板等大幅面人造板弹性模量的无损测定进行了许多研究^[2-9]。相比之下国内相关研究较少，高燕秋等^[10]通过在大尺寸人造板几何中心加载静载荷，测量其挠度进而计算弹性模量；周海宾等^[11]采用了一种悬臂扭弯振动法测定板材的弹性模量和剪切模量，但这些研究成果因可操作性差等原因均未能在生产实际中广泛应用。本研究提出一种基于薄板横向自由振动原理的足尺人造板弹性模量动态测定方法，即通过测量在2节线处支承下足尺人造板自由振动时的第1阶固有频率和其质量来测定其弹性模量，力图为足尺人造板弹性模量的快速、无损测定，提供一种可选择的方法。

4. 结论

振动方式测得的足尺人造板动态弹性模量（E_d）比传统方法测得的静态弹性模量（E_d ）略大，两者比值为1.03~1.22。足尺人造板E_d与E_d 间存在着良好的线性关系，刨花板和胶合板的E_d与E_d 之间的相关系数分别为0.96和0.91，2种板材总体数据的E_d与E_d 之间的相关系数达到了0.94，且均在0.001水平上显著相关。基于薄板横向自由振动理论的足尺人造板弹性模量振动测定是可行的。

Reference (19)

[1]	DÜNDAR, AS, AKKILIÇH. The prediction of mechanical properties of wood-based composites with vibration NDE method[J]. J Fac For Istanbul Univ, 2008, 58(2): 43-59.
[2]	COPPENS H. Quality control of particleboards by means of their oscillation behavior[C]//Proceedings of FESYP Technical Conference. Munich:European Federation of Associations of Particleboard Manufactures, 1988:143-165.
[3]	McNATT J D, WELLWOOD R W, BACH L. Relationships between small-specimens and large panel bending tests on structural wood-based panels[J]. For Prod J, 1990, 40(9): 10-16.
[4]	SHYAMASUNDER K, ASWATHANARAYANA B S, NAIDU M V. Nondestructive evaluation of modulus of elasticity and modulus of rigidity of plywood by sonic methods[C]//PELLERIN R F, MCDONALD K A. Proceedings of the 9th International Symposium on Nondestructive Testing of Wood. Madison:Forest Products Society, 1994:113-116.
[5]	SHI Bozhong, CAI Zhiyong. Nondestructive evaluation of full-sized particleboard panels using the vibration technique[C]//PELLERIN R F, MCDONALD K A. Proceedings of the 9th International Symposium on Nondestructive Testing of Wood. Madison:Forest Products Society, 1994:117-122.
[6]	LARSSON D. Stiffness characterization of wood based panels by modal testing[C]//SANDOZ J L, PELLERIN R F, MCDONALD K A. Proceedings of the 10th International Symposium on Nondestructive Testing of Wood. Lausanne:IBOIS-Chair of Timber Construction of the Swiss Federal Institute of Technology, 1996:237-246.
[7]	LAU P W, TARDIF Y. Evaluation of Moduli of Elasticity and Rigidity of Panel Products by Torsional-Bending Vibration[R]. Edmonton:Canadian Forest Service, 1996.
[8]	SCHULTE M, FRÜHWALD A, BRÖKER F W. Non-destructive testing of panel products by vibration technique[C]//SANDOZ J L, PELLERIN R F, McDONALD K A. Proceedings of the 10th International Symposium on Nondestructive Testing of Wood. Lausanne:IBOIS-Chair of Timber Construction of the Swiss Federal Institute of Technology, 1996:259-268.
[9]	MIRBOLOUK P, ROOHNIA M. Evaluation of dynamic modulus of elasticity of medium density fiberboard panel from longitudinal vibration tests on specimens[J]. BioResources, 2015, 10(1): 613-621.
[10]	高燕秋, 王兆伍, 张齐生. TMJ-A人造板弹性模量无损检测显示机的误差因素分析[J]. 木材工业, 2002, 16(5): 24-26.	GAO Yanqiu, WANG Zhaowu, ZHANG Qisheng. Analysis of measuring error on TMJ-a nondestructive testing equipment for structural board[J]. China Wood Ind, 2002, 16(5): 24-26.
[11]	周海宾, 任海青, 费本华. 木质复合板弯曲、剪切弹性模量动态测试[J]. 建筑材料学报, 2007, 10(5): 561-565.	ZHOU Haibin, REN Haiqing, FEI Benhua. Dynamical test on flexural and shear modulus of composite wood panels[J]. J Build Mater, 2007, 10(5): 561-565.
[12]	ZHOU Lujing, ZHANG Houjiang, GUAN Cheng. Analysis of vibration modal testing for the full-size artificial board[J]. J Mult, 2014, 9(6): 816-821.
[13]	管成, 周卢婧, 张厚江. 足尺中密度纤维板振动模态分析[J]. 西北林学院学报, 2015, 30(3): 228-233.	GUAN Cheng, ZHOU Lujing, ZHANG Houjiang. Analysis of the vibration modal of the full-sized medium density fiberboard[J]. J Northwest For Univ, 2015, 30(3): 228-233.
[14]	ZHOU Jianhui, CHUI Y H. Influence of boundary conditions on measurement of elastic constants of engineered wood-based panels using modal testing[C]//ROSS R J, GONÇALVES R. Proceedings of the 19th International Symposium on Nondestructive Testing of Wood. Rio de Janeiro:Forest Products Society, 2015:321-332.
[15]	张厚江,周卢婧,吴江. 足尺人造板弹性模量和动态粘弹性无损检测装置与检测方法:CN103439251A[P]. 2013-12-11.	ZHANG Houjiang, ZHOU Lujing, WU Jiang. Nondestructive full-scale artificial board elasticity modulus and dynamic viscoelasticity testing device and method:CN103439251A[P]. 2013-12-11.
[16]	管成, 张厚江, 周卢婧. 足尺人造板动态粘弹性检测[J]. 南京林业大学学报:自然科学版, 2015, 39(6): 131-136.	GUAN Cheng, ZHANG Houjiang, ZHOU Lujing. Detection on dynamic viscoelasticity of full-size wood composite panels[J]. J Nanjing For Univ Nat Sci Ed, 2015, 39(6): 131-136.
[17]	中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会. GB/T 4897.1-2003刨花板第1部分:对所有板型的共同要求[S]. 北京:中国标准出版社,2003.
[18]	中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会. GB/T 17657-2013人造板及饰面人造板理化性能试验方法[S]. 北京:中国标准出版社,2014.
[19]	王斌会. 多元统计分析及R语言建模[M]. 广州:暨南大学出版社,2014:62-77.

板材编号	材料	数量/张	板材平均尺寸/(厚×宽×长，mm)	平均密度/(g·cm^-3)	平均含水率/%
PB9	刨花板	12	8.97×1 223.00×2 442.30	0.66	4.50
PB12	刨花板	14	12.15×1 222.90×2 441.90	0.70	4.10
PB16	刨花板	25	16.04×1 223.10×2 441.00	0.70	4.30
PB18	刨花板	25	18.03×1 220.20×2 437.00	0.66	5.70
PB25	刨花板	10	25.05×1 220.90×2 440.70	0.68	6.80
PW5	胶合板	7	4.98×1 218.60×2 439.40	0.51	9.00
PW6	胶合板	6	6.00×1 220.00×2 440.00	0.59	10.20
PW7	胶合板	8	6.52×1 218.90×2 437.90	0.53	9.50
PW9	胶合板	23	9.35×1 219.20×2 438.40	0.51	9.40
PW12	胶合板	8	11.59×1 223.00×2 439.40	0.54	9.00
PW15	胶合板	20	14.47×1 220.80×2 439.40	0.51	10.50
PW18	胶合板	24	17.28×1 220.80×2 438.80	0.52	8.60
PW20	胶合板	8	19.46×1 218.00×2 439.40	0.51	9.00
PW25	胶合板	16	24.36×1 219.20×2 439.50	0.53	9.80

板材编号	弹性模量代号	弹性模量/Pa			平均弹性模量之比(E_d/E_b)
板材编号	弹性模量代号	平均	标准偏差	变异系数/%	平均弹性模量之比(E_d/E_b)
PB9	E_d	2 903.09	175.06	6.03	1.08
PB9	E_b	2 696.42	127.81	4.74	1.08
PB12	E_d	3 670.95	280.66	7.65	1.04
PB12	E_b	3 537.74	297.16	8.40	1.04
PB16	E_d	3 631.94	141.47	3.90	1.06
PB16	E_b	3 415.47	116.85	3.42	1.06
PB18	E_d	2 338.77	164.23	7.02	1.12
PB18	E_b	2 083.80	187.93	9.02	1.12
PB25	E_d	3 022.87	422.67	13.98	1.12
PB25	E_b	2 697.27	433.03	16.05	1.12

板材编号	弹性模量代号	弹性模量/Pa			平均弹性模量之比(E_d/E_b)
板材编号	弹性模量代号	平均	标准偏差	变异系数/%	平均弹性模量之比(E_d/E_b)
PW5	E_d	3754.08	612.87	16.33	1.22
PW5	E_b	3066.90	249.97	8.15	1.22
PW6	E_d	7259.83	663.87	9.14	1.19
PW6	E_b	6096.83	543.53	8.91	1.19
PW7	E_d	3377.30	467.37	13.84	1.19
PW7	E_b	2836.41	319.78	11.27	1.19
PW9	E_d	4178.87	1177.09	28.17	1.11
PW9	E_b	3748.21	988.81	26.38	1.11
PW12	E_d	5128.97	1014.52	19.78	1.11
PW12	E_b	4630.52	388.28	8.39	1.11
PW15	E_d	3391.24	678.72	20.01	1.06
PW15	E_b	3208.55	493.82	15.39	1.06
PW18	E_d	4997.50	727.79	14.56	1.14
PW18	E_b	4372.35	476.21	10.89	1.14
PW20	E_d	4482.71	259.21	5.78	1.03
PW20	E_d	4342.56	244.23	5.62	1.03
PW25	E_d	4790.10	346.15	7.23	1.12
PW25	E_b	4263.15	450.38	10.56	1.12

板材编号	板材数	y=ax+b		相关系数r	F值	显著性
板材编号	板材数	a	b	相关系数r	F值	显著性
PB	86	1.01	-266.18	0.96	1 092.00	***
PW	120	0.73	718.94	0.91	601.30	***
PB和PW	206	0.79	455.97	0.94	1 669.00	***
说明:***0.001差异显著。

Measuring modulus of elasticity of full-size wood composite panels using vibration method

doi: 10.11833/j.issn.2095-0756.2016.06.020

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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