This standard specifies the test method for determining the shear strength of plastics by compression perforation using a circular perforator. This standard applies to rigid thermoplastics and thermosetting plastics, including filled plastics and fiber-reinforced composites. This standard does not apply to foam plastics. GB/T 15598-1995 Plastic shear strength test method perforation method GB/T15598-1995 Standard download decompression password: www.bzxz.net

UDC 678.5 +620. 176.2
National Standard of the People's Republic of China
GB/T15598--1995
Testing methods for shear strength of plastics by pupch tool
Published on 1995-06-12
Punch method
Implemented on 1995-12-01
Published by the State Administration of Technical Supervision
Standard of the People's Republic of China
Punch method
Testlag methods for phear strength of plastlcs by panch tool
1 Subject and Scope of Application
GB/T15598-1995
This standard specifies the test method for determining the shear strength of plastics by compression perforation using a shaped perforator. This standard is applicable to high-quality plasticized plastics and functional plastics, including filled plastics and fiber-reinforced composite materials. This standard does not apply to foam plastics,
2 References
GB 1039 General Rules for Test Methods of Mechanical Properties of Plastics GB2918 Standard Environment for Test Conditions and Test Surfaces of Plastics 23 Text
3. Shear stress (shear s)
During the test, the value obtained by dividing the potential shear load applied to the specimen at any time by the shear surface period. 3.2 Shear strength (eng)
The maximum shear stress borne by the material under the action of shear stress. 3.3 Ahear strength that yields: the shear stress at the first point where the load does not increase with deformation on the load-deformation curve. 3.4 Ahear strength at break: the shear stress at which the specimen fails under shear load. 3.5 Deformation rate: the ratio of the depth of the perforation static pressure into the test specimen to the thickness of the specimen under shear load, expressed as a percentage. 3.6 Ahear strength that aperified defomation: the shear stress in addition to the nominal deformation on the shear stress-deformation curve. 4 Principle: this method uses a circular perforation with a compression shearing method to apply a shear load to the specimen, causing the specimen to produce shear deformation or failure to determine the shear plasticity of the material.
5 Equipment
5.1 Testing machine
Any testing machine that can move the crosshead at high speed, has automatic centering and deformation measuring devices for compression testing can be used. 5.1.1 Load indicator
National Technical Supervision Bureau 1995-06-12 1995-12-01 GE/T15598-1995
Load indicator, the indication of the shear load of the specimen at a certain moment in the test chamber, the accuracy is ± 1% of the indicated value. 5.1.2 Deformation measuring device
Deformation measuring device, the depth of the perforator pressed into the specimen at a certain moment during the test process, should be measured accurately to 0.01 m. 5.2 Shearing tools Shearing tools are tools that transfer shear load to the specimen. They are supported by a punch and a die. They are required to have the function of correctly fixing the specimen on the punch and die of the tool and evenly distributing the load to the specimen. Their shapes and dimensions are shown in Table 1 and Figure 1. The material of the clamp is standard tool T10, the hardness HRA, >(2, or equivalent materials. The dimensions of the relevant parts of the shearing tool are shown in Table 1. |tt||Diameter of the punch
The type of the inner diameter d of the die and the true diameter D of the hole
Figure 1
1-lower, 2-screw; 3-age diagram, 4-test piece 15-use random combination + burst bolt 19 sample fire ball
6 upper 17
Environmental difference
5.3 Micrometer
CR/T15598—1995
The micrometer should be able to determine the sample sequence, the production is 0. 01 mm6 Sample
Stone 1 The thickness of the sample should be uniform, the surface should be smooth and flat, and free of mechanical and impurities. 6.2 The sample is a plate with a side length of 50mm or a diameter of 5cm, a thickness of 1.0~12.5mm, and a hole with a diameter of 11hm in the center (see Figure 2). The tensile test is 3~4mm. = 1. t-12, 5
Figure 2 Shear test
63 The preparation of the sample can be carried out according to the relevant standards or the agreement between the two parties by injection molding, pressing or correction molding, including cutting from the molded plate by mechanical methods. The results measured by different processing force methods cannot be compared with each other. 6.4 Each group of rows shall not be less than five small,
? Test steps
7.1 According to the assumptions of GB1039 Section 2, the test sample is tested and the test environment is adjusted according to the provisions of GB2018 Section 2. The state adjustment time is at least 40 h.
了.2 Take four points evenly at the sheared part of the specimen to measure the thickness, accurate to 0.11mm, and take the average value as the specimen thickness. 7.3 The test thickness is 1m/roin ±506.
7.4 Insert the perforator into the middle of the specimen, put a pad on it and fix it with a cap, then install the perforator in the fixture. Then fix the fixture evenly with four bolts to prevent the test group from bending during the test. 7.5 When installing the tool, the center line of the shear tool should coincide with the center line of the testing machine. 7.6 Automatic testing machine, add pressure to the perforated group, record the maximum load (or breaking load, reverse load, constant rate load). It can be recorded when necessary. Record the deformation and then take out the sample under pressure. The results are shown in Table 8. B.1 Shear strength is calculated according to formula (1):
single shear load (or destructive shear strength, shear strength with eye, shear strength with fixed deformation rate) MPa where
shear load N
D is the diameter of the perforator in m bZxz.net
f is the sample load, mm,
GB/T1559B-1995
B.2 When measuring shear strength, P is the maximum load + when measuring average shear strength, P is the destructive load, minus the fixed shear strength, F is the bending load, when measuring the fixed deformation shear strength, P is the shear load at the specified deformation rate. The integral value of the specified deformation rate shall be determined by negotiation between the two parties concerned. 8.3 The test results shall be expressed as the arithmetic mean value, with three significant digits. The standard deviation is calculated as follows: (2) Where S represents the standard deviation! 2 - the arithmetic mean value of the single specified value - the number of specified values. 9 Test report The test report shall include the following contents: Material name, specification, and manufacturer; Test shape, size and preparation method; Test environment, temperature, depth, state adjustment time; Test speed; Shear strength, shear strength, yield shear strength, shear strength at a given deformation rate, standard deviation; Test personnel; Test period.
Additional Notes
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Physical and Mechanical Testing Branch of the National Material Standardization Technical Committee, and is drafted by the Silicon Research Center of the Ministry of Chemical Industry. The main drafters of this standard are Li Lihua and Luo Diandao. The standard adopts JI5K7214-35 (Test method for determining the shear strength of plastics using a perforation tool)
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.