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GB/T 1454-2021: Test method for edgewise compressive properties of sandwich constructions
Status: Valid GB/T 1454: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 1454-2021 | English | 189 |
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Test method for edgewise compressive properties of sandwich constructions
| Valid |
GB/T 1454-2021
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| GB/T 1454-2005 | English | 439 |
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Test method for edgewise compressive properties of sandwich constructions
| Obsolete |
GB/T 1454-2005
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| GB/T 1454-1988 | English | 199 |
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Test method for edgewise compressive properties of sandwich constructions
| Obsolete |
GB/T 1454-1988
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PDF similar to GB/T 1454-2021
Basic data | Standard ID | GB/T 1454-2021 (GB/T1454-2021) | | Description (Translated English) | Test method for edgewise compressive properties of sandwich constructions | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q23 | | Word Count Estimation | 10,144 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 1454-2021: Test method for edgewise compressive properties of sandwich constructions---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method for edgewise compressive properties of sandwich constructions
ICS 83.120
Q23
National Standards of People's Republic of China
Replace GB/T 1454-2005
Test method for lateral pressure performance of sandwich structure
Released on 2021-03-09
2021-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Test method for lateral pressure performance of sandwich structure
1 Scope
This standard specifies the test principles, test equipment, specimens, test state adjustment and test environmental conditions of the lateral pressure test method for sandwich structures.
Test procedures, test results and treatment and test reports.
This standard is applicable to the determination of the lateral compressive strength, modulus, Poisson's ratio of sandwich structure and the lateral compressive strength and modulus of sandwich structure panels.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 1446 General Principles of Test Methods for Performance of Fiber Reinforced Plastics
GB/T 3961 Terminology for fiber reinforced plastics
3 Terms and definitions
The following terms and definitions defined in GB/T 3961 apply to this document.
3.1
Edgewisecompression
The direction of force is parallel to the compressed state of the sandwich panel.
Note. Anisotropic materials include two states, longitudinal and transverse, see 6.6.
3.2
Edgewisecompressivestrength
In the case of lateral pressure failure, the compressive stress obtained by dividing the corresponding load by the cross-sectional area of the sandwich structure.
3.3
Side compression modulus edgewisecompressivemodulus
In the process of lateral pressure, the ratio of the compressive stress and strain obtained by dividing the corresponding load in the elastic range by the cross-sectional area of the sandwich structure.
3.4
The side pressure strength of the panel edgewisecompressionstrengthoffacing
In the case of lateral pressure failure, the compressive stress obtained by dividing the corresponding load by the cross-sectional area of the sandwich structure panel.
3.5
The side compression modulus of the panel edgewisecompressivemodulusoffacing
In the process of lateral pressure, the ratio of compressive stress to strain obtained by dividing the corresponding load in the elastic range by the cross-sectional area of the sandwich panel.
3.6
Nominal thickness of facing
Calculate or measure the thickness of the blank panel or the panel directly provided by the manufacturer according to theory.
4 Test principle
A compressive load is applied to the sample along the direction of the panel through the support fixtures at both ends of the sample (usually one end is round support, one end is flat support)
Support), with the help of the circular support to make the panel evenly stressed, so that the sandwich structure or sandwich structure panel will be destroyed.
5 Test equipment
5.1 The testing machine should meet the requirements of GB/T 1446 for testing machines.
5.2 The side pressure fixture is shown in Figure 1, which is divided into flat support [see Figure 1a)] and round support [see Figure 1b)], which can be adjusted by screws.
Like installation thickness.
5.3 Deformation measurement system, can obtain the deformation of the sample, the accuracy of the strain gauge is 0.5μ, and the accuracy of the extensometer is 1%.
5.4 Vernier calipers or other length measuring instruments, with an accuracy of 0.02mm.
Figure 1 Schematic diagram of supporting fixture
6 Sample
6.1 The sample shape and size are shown in Figure 2.The thickness can be the same as the thickness of the sandwich structure product. The recommended core thickness is 15mm and the panel thickness is 0.5mm~1.0mm.
6.2 The recommended sample width is 60mm, and the width of lattice core materials such as honeycomb and corrugated shall include at least 4 complete lattices.
6.3 The unsupported height of the sample should not be greater than 8 times the thickness. Generally, the ratio of formula (1) is adopted.
t.b.H=1.4.6 (1)
Where.
t ---the thickness of the sample, in millimeters (mm);
b ---The width of the sample, in millimeters (mm);
H ---The height of the specimen without support, in millimeters (mm).
6.4 The total height of the sample H'=H 2h, and the supporting height h is 10mm~20mm.
6.5 The loaded end surface of the sample should be smooth and free of burrs, parallel to each other, and its parallelism tolerance should be 0.10mm, and should be perpendicular to the panel, and the perpendicularity should be normal.
The difference is 0.2mm.
6.6 For the orthotropic sandwich structure, the samples are divided into two types. longitudinal and transverse.
6.7 For the honeycomb sandwich structure, if effective damage cannot be obtained, epoxy adhesive can be used to reinforce or potting within 20mm of both ends of the sample.
6.8 The number of samples is in accordance with GB/T 1446, and at least 5 are valid.
7 Test status adjustment and test environmental conditions
According to the provisions of GB/T 1446.
8 Test procedure
8.1 Screen the samples according to GB/T 1446, number the qualified samples, measure the width of any three places of the sample, and take the arithmetic average. Panel thickness
Take the nominal thickness or the average thickness of 10 panels in the same batch of samples. The measurement accuracy is in accordance with GB/T 1446.
Note. 1 value per panel is enough.
8.2 Install the sample in the supporting fixture according to Figure 3.Tighten the screw until the sample does not fall. Pay attention to the centering and adjust the zero point of the testing machine.
8.3 When determining the lateral compressive strength, adjust the circular support, and the two panels of the sample are evenly compressed. Then use 0.5mm/min~2mm/min
Load the sample at a constant speed until the specimen fails, record the load-displacement curve, and record the failure mode, see Table 1 and Figure 4.
Note. When the testing machine has a spherical support structure, this structure can be used instead of a round support at one end, while flat support supports are used at both ends of the sample.
8.4 When determining the elastic modulus and Poisson's ratio, adjust the circular support, apply the initial load (approximately 5% of the maximum load), install and adjust the deformation measurement
The instrument is loaded to about 15% of the maximum load, and the deformation measurement instrument reading is observed. If the difference between the readings on both sides exceeds 10% of the average value, adjust the support
Seat and reload, load at a constant speed of 0.5mm/min~2mm/min to 40%~50% of the failure load, and record the load-deformation
data.
8.5 Samples with obvious defects or broken ends should be invalidated. If there are less than 5 valid samples in the same batch, the test should be repeated.
9 Test results and treatment
9.1 Draw a lateral pressure load-displacement curve or a lateral pressure load-deformation curve for valid data.
9.2 The lateral compressive strength of the sandwich structure is calculated according to formula (2).
σb=
Pb
b·t
Ef---The lateral pressure modulus of elasticity of the panel, in megapascals (MPa).
Note. Equations (4) and (5) do not apply to high modulus core materials. In the formula, the strength and elastic modulus of the core itself have been ignored.
9.6 The Poisson's ratio of the sandwich structure is calculated according to formula (6).
μ ---Poisson's ratio of the sandwich structure, dimensionless;
l1 --- the gauge length of the longitudinal deformation gauge, in millimeters (mm);
l2 --- The gauge length of the transverse deformation gauge, in millimeters (mm);
Δl1---corresponds to the incremental deformation value within the gauge length l1, in millimeters (mm);
Δl2---corresponds to the incremental value of deformation within the gauge length l2, in millimeters (mm).
9.7 The result processing and statistics shall be in accordance with the provisions of GB/T 1446.
10 Test report
The test report generally includes the following content.
a) The name of the test item and the number of this standard;
b) Sample source and preparation, material variety and specifications;
c) Sample number, shape, size, appearance quality and quantity (if it is an anisotropic material, the vertical or horizontal direction should be indicated);
d) Test temperature, relative humidity and sample state adjustment;
e) The name and model of the test equipment, etc.;
f) Test speed;
g) Test results. give the performance value, arithmetic mean, standard deviation, dispersion coefficient and failure mode of each sample for each sample;
h) Test personnel, test date and others.
Appendix A
(Informative appendix)
Calculation of lateral pressure performance when the panel is different
A.1 Lateral pressure performance of sandwich structure
A.1.1 The lateral compressive strength of the sandwich structure is calculated according to formula (A.1).
σb=
Pb
b·t
(A.1)
Where.
σb---Sandwich structure lateral compressive strength, in megapascals (MPa);
Pb---breaking load, the unit is Newton (N);
b ---The width of the sample, in millimeters (mm);
t ---The thickness of the sample, in millimeters (mm).
A.1.2 The lateral compression modulus of the sandwich structure is calculated according to formula (A.2).
E=
l·ΔP
b·t·Δl
(A.2)
Where.
E --- Lateral compression modulus of the sandwich structure, in megapascals (MPa);
l --- Deformation gauge gauge length, in millimeters (mm);
ΔP --- the load increment value of the initial straight line segment on the load-deformation curve, the unit is Newton (N);
Δl ---corresponds to the incremental value of deformation within the ΔP gauge length, using the average value of the readings of two deformation meters, in millimeters (mm).
A.2 Side pressure performance of the panel
A.2.1 The lateral compressive stress or strength of the panel is calculated according to formula (A.3) and formula (A.4).
σf1=
Pb·Ef1
Ef1·tf1·b Ef2·tf2·b
(A.3)
σf2=
Pb·Ef2
Ef1·tf1·b Ef2·tf2·b
(A.4)
Where.
σf1 --- Lateral compressive strength or lateral compressive stress of panel 1 (one of the panels), in megapascals (MPa);
σf2 --- the lateral compressive strength or lateral compressive stress of panel 2 (corresponding to the other side panel of panel 1), in megapascals (MPa);
Ef1, Ef2---the modulus of elasticity of panel 1, panel 2, in megapascals (MPa);
tf1, tf2 --- the thickness of panel 1, panel 2, in millimeters (mm).
Note 1.When the ratio of the elastic modulus of the two panels is known, or the elastic modulus of one panel is known, the panel side of the sandwich structure of two different panels can be measured.
Compressive strength.
Note 2.The side compressive stress of the panel on one side of the failure is the panel side compressive strength, and the other side panel is called the panel side compressive stress. If panel 2 is damaged, then σf2 is
The lateral compressive strength of the panel, σf1 is the lateral compressive stress of the panel.
A.2.2 The side compression modulus of the panel is calculated according to formula (A.5) and formula (A.6).
When Ef1 is known, Ef2 is calculated according to formula (A.5).
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