QB/T 2710-2005 Physical and mechanical tests on leather - Determination of tensile strength and elongation

This standard specifies the method for determining the tensile strength of leather, and the elongation under a specified load or at break. This standard is applicable to all types of leather. QB/T 2710-2005 Physical and mechanical tests on leather - Determination of tensile strength and elongation QB/T2710-2005 Standard download decompression password: www.bzxz.net

Classification number: Y45
Record number: 157622005
Light Industry Standard of the People's Republic of China
QB/T2710-2005
Low-quality QB/T3812.5-199
Physical and mechanical tests
Determination of tensile strength and elongation
LeatherPhysical and mechanical tests-Determination of tensile strcngth and pcrcentage extension(S 337:2002. LeatherPhvsical and mechanical tests-Determination of tensile strength and pcrcentage extension(S 337:2002. extcnsinn,MoD)2005-03-19 Issued
National Development and Reform Commission of the People's Republic of China Implemented on September 1, 2005
This standard is in accordance with QB 3812.5-1 State Pipian Tensile Illuminance System Determination? Flash Meter QB/T271C—2005
This standard adopts 1S03376:2002 Physical and mechanical tusis-—Txlunitiliun if tesie suength anl penentige cxtcr.sinn), This international standard is based on the draft of ISO3376:1976 by the International Federation of Chemical Engineers TS standard FQ/T3812.51999 ISO3376:1976, ISO3570 has been subscribed, and ISO3376:2002 ISO3376:1976
This standard is newly drafted based on ISO3376:2007. This standard is based on the actual situation in my country, and the following technical modifications were made when it was adopted: "Current Standard Reference" and other original parts were changed to our standard The standard simplifies the requirements for test machines and cancels the requirement for S7K-1 to prevent incorrect misunderstanding of the standard parts: in addition to the "parameter equality" in 5.1 and the "expression of results", this standard has also been revised to make the use of new materials: in addition to the front of the S clause: the "this international standard is changed to the standard \ with a small dot", "lift as a small number", "use" as a multiplication,
compared with 0B3812.5-1, this standard has changed a lot, such as adding 2 "reference documents as normative documents" 5. "Selection and test standard" content: the original "small size" of the sample is eliminated - the content of the standard is eliminated 6. This standard is proposed by the China National Standardization Association. The standard is under the jurisdiction of the China National Standardization Technical Committee (SAC/C252) and is signed by: China National Institute of Standardization and Technology. It was first issued in October 1984 as the original national standard GB4689.5-1984, and converted into the light T standard QB/T38 in November 1999. 12.5—1999, the industry standard Q12.5199 leather tensile strength calculation method
QB/T2710-2005
leather physical and mechanical test tensile strength and elongation determination This standard specifies the method to obtain the tensile strength and elongation at break under specified conditions. This standard is applicable to various types of leather.
2 short normative references
The following documents are applicable to this standard! And become the references of this standard. See the reference period, the revised version (including the period) or revised version of this standard will be used after ten years. The standard must be used in the research of the model standard. The new version of this document is also used: for the use of the document, its only applicable to this standard. QB/T2706-2005 Core chemistry, Yang Feng, mechanical vibration test sample part 1502418: 2002, M0D) QB/T2707-2005 Leather physical and mechanical test specimen preparation and inquiry (IS2419: 2002: MOTQD2709-205 Leather physical and mechanical test specimen measurement 1S02382002, MOD) 3 Principle
Test to select a certain rate of selection to pull the intermediate to the predetermined force but change the test bar to the extreme breaking point for the acceptance and medium bar degree of working time. 4.1 Tensile testing machine
This testing machine should meet the following requirements:
The test medium should be fixed or pneumatically powered by a machine or other material and the test specimen should be subjected to micro-extension at a rate of (100±20)nm/min. The maximum length of the specimen should be 45mm. The material of the inner surface of the specimen should be designed to reach a maximum value of negative 30°: The sliding between the specimen and the fire tool should not cause any loss of more than 1% of the initial separation. 4.2 Elongation determination device
The elongation should be determined by means of a visual or optical monitoring device or a connected sensor at two fixed points on the test surface. 4.3 Thickness gauge
Equicentricity H/270-2005
4.4 Die cutter
Conforms to the specification of Q2707-2005: Specification of table 1: Figure 1 Shape of the specimen
QR/T2710-2005
4.5 Standard caliper
Minimum accuracy (.1mm
5 Preparation of test specimens
5.1 Taking SamplebZxz.net
According to the provisions of QB/T2706-2005
Table 1 Dimensions of the test specimen
5.2 Preparation of the test
According to the specification of QB/T2707-2005, 6 test specimens are cut from the surface of the carbon sheet (4.4), and the long sides of 3 test specimens are half of the back number. The long sides of 3 test specimens are about the same as the test line: if there is a sign of change and slippage between the test surface and the test surface, a large film knife is used. 5.3 Air conditioning of the test specimen
According to the provisions of QB/T210/-200S.
6 Procedure
6. Determination of the size
.1.1 Select a position on each test specimen, and measure the width of the test specimen (4.5) in front of the knife (usually 0.mm). Each position is measured at a point (see Figure 1), with two points and 48 points as the inner bar. The accumulated half of the six measured values ​​is used as the width of each test strip. If correct, the width of the wrench can be used as the actual determination. 6.1.2 According to the provisions of QB/D2792005, the thickness of each test strip is measured at the following three points: the first three points, namely the center point E, and the other points at the hundred points (the middle position of the two lines). The calculated values ​​of the three positions are used as the thickness of each test strip. 6.2 Determination of tensile strength
6.2.1 Adjust the upper and lower actual distances of the test strip (4.1) to 50mm (standard test strip) or 10Umm (large test strip). The specimen must be clamped so that the edge of the clamp is flat with the half of the specimen surface. 6.2.2 The tensile testing machine shall be used to break the specimen and record the maximum force at break as the breaking force F6.3 The specified negative elongation is specified in 6.8.1 According to 6.2.1, only the test must be made (accurate to 0.5m); and the initial length during the test shall be recorded. 6.3.2 The test force can be reduced by 5. With the increase of the recommended value, the original distance between the sound and the actual value shall be recorded, or a sensor shall be used to change the output or output of the test machine. 6.3.3 Record the distance when the specified load value is reached for the first time. This distance is the length of the test rod under this force. The testing machine should not be stopped before completing the test in 6.2 or 6.4. 64 Determination of elongation at break
8.4.16.3. [Operation:
6.4.2 Perform test or straight test: 6.4.3 Record the state of the fixture during the test, as the length of the test 16.5 Sliding difference
When the test is carried out on the same day as the test: 6.2~6. Day selection test: When the result is only a sliding double, the flow rate is 1% of the initial separation, and the maximum loss model (4.4) is the new formula. 3
7 Expression of results
7.1 Tensile strength
The tensile strength of the specimen is calculated according to formula (1).
Tensile strength, expressed as Newton per square meter (N/mm>>The maximum value during the test, in Newton: The average strength of the sample, in Newton (mm) The average thickness of the sample, in meters (mm): The average tensile strength of all samples is calculated, and the result is expressed as an average value: 7.2 Specified load negative elongation
Specified negative elongation: The number is expressed in %, calculated according to formula (2). -103
Where:
Specified negative elongation number, %:
The distance from the torch or sensor to the torch height at the specified load when the torch or sensor is initially set.
Calculate the value of the elongation of the sample, and express it as an average value. 7.3 Elongation at break
The elongation at break F of the sample, the value is expressed in %, and the formula (3) is used to calculate E
-5x100
- elongation at break, %:
- The distance between the optical sensor and the sample during installation: - The distance between the fixture or sensor:
- The average value of the elongation at break of all samples, expressed as an average value. The test report
The test report should contain the following contents: || tt||This standard number;
Product name, summary, type
Detailed information of the product, any inconsistency with 0B/T2710-2005; Test conditions (standard air: 20℃/65% or 2350%), water resistance value (N/mm):.
Specified half-groove value of the load piece length;
Average length of the broken piece:
Normal conditions found in the test;
Differences between actual operation and this standard. Q0/T2710-2005
（3）
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