GB/T 32061-2015 English PDF (GBT32061-2015)

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GB/T 32061-2015: Testing method of laminated glass interlayer shear modulus
GB/T 32061-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.01
Q 30
Testing Method of Laminated
Glass Interlayer Shear Modulus
ISSUED ON. OCTOBER 9, 2015
IMPLEMENTED ON. SEPTEMBER 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Terms and Definitions ... 4
3 Test Device ... 5
4 Specimen ... 6
5 Test Procedures ... 6
6 Data Analysis ... 7
7 Test Report ... 7
Appendix A (Informative) Table Example ... 9
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard was proposed by China Building Material Federation.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Industrial Glass and Special Glass (SAC/TC 447).
Drafting organizations of this Standard. China Building Material Test and Certification
Group Co., Ltd., Dupont China Holding Co., Ltd., and National Security Glass and
Quartz Glass Quality Direct Examination Center.
Chief drafting staffs of this Standard. Zhang Congcong, Wang Lichuang, Zhou Zhen,
Zhou Chunhua, Huang Xiaolou, Han Song, Maio Xiangyang, Bao Ji, Liu Jing, Liu
Sheng, Liu Haitao, Zuo Huixia, Chen Lin, Zhang Jingling, Ding Zuoxin, and Zhang Rui.
Testing Method of Laminated
Glass Interlayer Shear Modulus
1 Scope
This Standard specifies the terms and definitions, test device, specimen, test
procedures, data analysis and test report of laminated glass interlayer shear modulus
(G).
This Standard is applicable to the measurement of Polybutylene Butyral (PVB),
Ethylene Vinyl Acetate Copolymer (EVA), laminated glass interlayer shear modulus
including ionic interlayer film, and the measurement of other visoelastic material shear
modulus can refer to this Standard.
2 Terms and Definitions
The following terms and definitions are applicable to this document.
2.1 Young’s complex modulus
When material is in the elastic limit, the ratio between normal stress and normal strain,
which is expressed by E* in MPa.
NOTE. Young’s complex modulus consists of real Young’s storage modulus (expressed by E’
in MPa) and imaginary Young’s storage modulus (expressed by E’’ in MPa); i.e.. E*= E’ + iE’’,
thereof i is the imaginary unit. The Yong’s storage modulus indicates the energy stored by
visoelastic material during the deformation due to elastic deformation. The Young’s loss
modulus indicates the energy loss of the visoelastic material during the deformation due to
plastic deformation (irreversible).
2.2 Shear modulus
When material is in the elastic limit, the ratio between shear stress and shear strain,
which is expressed by G in MPa.
2.3 Poisson’s ratio
When material is dragged or compressed in one direction, the ratio between the
absolute value of transverse positive strain and absolute value of axial positive strain,
which is expressed by µ.
5.4 According to the tensile mode shown in Figure 1, measure it from the low to high
temperature; obtain the original data. the Young’s storage modulus E’ and Young’s loss
modulus E’’ of specimen under different temperature and different loading period.
5.5 Open the liquid nitrogen supply device for cooling till reach the lower limit of the
set temperature.
6 Data Analysis
6.1 Analyze the original data obtained from 5.4, then draw the time-temperature
equivalent principal curve for the interlayer material at different temperature.
6.2 According to the different temperature and time principal curve data, adopt linear
interpolation method to select, on the principal curve, the Young’s complex modulus
value with corresponding temperature and load cycle. Prepare the table of Young’s
complex modulus corresponding to time and temperature, see Table A.1.
6.3 Use the mathematical relationship formula (1) among Shear Modulus G, Young’s
Complex Modulus E*, and Poisson’s Ratio µ, and calculate the Shear Modulus G of
interlayer material. Obtain the table of shear modulus corresponding to time and
temperature, see Table A.2.
NOTE. in the range of -40°C~80°C, the Value-µ of PVB, EVA and ionic interlayer film can
be regarded as Constant 0.5.
7 Test Report
The test report shall contain the following contents at least.
a) Specimen situation. name, type and source;
b) Description of test device;
c) Specimen dimension and thickness;
d) Before test, the storage temperature, humidity and storage time of sample;
e) Temperature- rise procedures include initial and final temperature and
temperature-rise step length;
f) Original test data;