HG/T 2379-1992 Test method for shear strength of graphite adhesives HG/T2379-1992 Standard download decompression password: www.bzxz.net

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HG/T2379-92
Graphite Adhesive Bond Shear Strength
Test Method
1992-09-15 Issued
Ministry of Chemical Industry of the People's Republic of China
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: Issued
Chemical Industry Standard of the People's Republic of China
Graphite Adhesive Bond Shear Strength
Test Method
Subject Content and Scope of Application
HG/T2379-
This standard specifies the instrumentation, specimens, test steps and result processing methods for the graphite adhesive bond shear strength test. This standard applies to the determination of the bond shear strength of graphite materials bonded by adhesives. Reference Standards GB/T13465.1 General Rules for Test Methods of Mechanical Properties of Impermeable Graphite Materials 3. Terminology 3.1 Graphite Adhesive - Phenolic graphite mastic or other suitable adhesives used to bond graphite materials. 3.2 Bonding Shear Strength - The shear force per unit bonding surface when the bonding surface is damaged by pure shear force when the graphite materials are bonded by adhesives. 4 Instruments and Equipment 4.1 Vernier Caliper: Range 0-150mm, Graduation 0.02mm 4.2 Material Testing Machine: The measuring plate accuracy is not less than Grade 1 or the error does not exceed ±1% 4.3 Loading Circle, as shown in Figure 1, is made of impermeable graphite material or other materials with suitable strength. 060
1x45°
Figure 1 Loading photo
5 Test specimen
5.1 Test specimen shape, size and requirements
1992-09-15 Approved by the Ministry of Chemical Industry of the People's Republic of China
1993-07-01 Implementation
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5.1.1 The shape of the test specimen is shown in Figure 2,
HG/T2379-92
-Figure 2 Test specimen shape and size
1-Inner bonding part; 2-External bonding part ;3-Loading and solidification 5.1.2 When the inner bonding part is a graphite extrusion tube, the inner diameter d is 22mm, the outer diameter D is 32-/mm, the outer surface is not cut, and the bonding area is sanded with sandpaper. When the inner bonding part is made of impermeable graphite block, the inner diameter d is 18±0.1mm, the outer diameter D is 32-0.,mm.
5.1.3 When the outer bonding part is made of impermeable graphite block, the inner diameter d is 33±0.1mm, the outer diameter D is 60mm, and L is 15mm5.1.4 At the corner during bonding, R≤0.5mm, cutting is not allowed, and there is no adhesive on the non-bonding surface. 5.2 Sample number plate and sample processing method, according to the relevant provisions of GB/T13465.1, 6 Test steps
6.1 The outer diameter D of the inner adhesive part and the inner diameter d of the outer adhesive part are measured three times with a vernier caliper at a 60° angle on the cross section perpendicular to the axis of the tested part, and the average value is taken. 6.2 Measure the thickness of the outer adhesive part, along the generatrix direction and the circumferential direction, and measure three times at three equal points, and take the average value. 6.3 Select the appropriate test machine range so that the maximum shear load is within the range of 15~85% of the full range of the test machine. 6.4 Destroy the sample that has been processed to meet the requirements, together with the loading ring, on the test machine, adjust the position plate so that the axis of the sample coincides with the axis of the upper and lower pressure heads of the test machine, and the coaxiality tolerance is 0.5mm.
6.5 Slowly start the test machine, apply the load evenly and without impact at a speed of 40~50N/s until the sample is destroyed, and read the load value at the time of shear failure.
7 Calculation of results
7.1 Calculate the average diameter of the bonding surface according to formula (1), rounded to 0.01mm, p
Where: D-
-average diameter of the bonding surface, mm;
-outer diameter of the inner bonding part, mm;
d-inner diameter of the outer bonding part, mm.
7.2 Calculate the area of ​​the bonding surface according to formula (2), rounded to 0:01mm22
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Where: A—bonding area, mm2;
D——average diameter of bonding surface, mm;
-thickness of outer bonding part, mm,
HG/T2379-92
A= yuanDL
7.3 Calculate the bonding shear strength according to formula (3), rounded to 0.1MPaP
Where: I——bonding shear strength, MPa; P—shear load, N;
A———bonding surface area, mm
7.4 If the following conditions occur during the test, the test data of the sample shall be deemed invalid. a. The non-bonding surface is damaged by shearing.
b. The bonding surface has obvious defects such as pores, slag inclusions, cracks, etc. 7.5 Each group of samples with valid test data shall be no less than 3. 7.6 The result processing shall be in accordance with the relevant provisions of GB/T13465.1 8 Test report
Test report According to the relevant provisions of GB/T13465.1, additional notes are given:
This standard is proposed by China National Chemical Equipment Corporation, and is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. This standard is drafted by Nantong Carbon Rope Factory. 2)
The main drafter of this standard is Gao Pengzhang.
From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG5-1334-80 "Test Method for Shear Strength of Graphite Phenolic Adhesive Bonding" will be invalidated at the same time.
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People's Republic of China
Chemical Industry Standards
Graphite Adhesive Shear Strength Test Method HG/T 2379-92
Editor: Chemical Industry Standards Editorial Department
(Institute of Standardization, Ministry of Chemical Industry)
Postal Code: 100013
Printing: Institute of Standardization, Ministry of Chemical Industry
Copyright: No Printing
Format: 880×12301/16 Number of Printing Sheets: 6000 First Edition, July 1993 First Printing, July 1993 Number of Printing: 1-300
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