Elastic modulus is a measure of the relationship between stress and elongation or compression elastic deformation of a material under the action of external force. Its value is the ratio of normal stress to strain on the cross section of the specimen. GB 3074.2-1982 Determination of elastic modulus of graphite electrode GB3074.2-1982 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for the determination of the elastic modulusof graphite electrodes
1 Definition
UDC 621.35.035.2
: 661.666.2
GB 3074.2-82
Elastic modulus is a measure of the relationship between stress and elongation or compression elastic deformation of a material under the action of an external force. Its value is the ratio of the normal stress to the strain on the cross section of the specimen.
2 Instruments and equipment
2.1 The device can be divided into five parts:
Exciter - electrical/mechanical energy transducer, used to excite the resonance of the specimen. Receiver - mechanical/electrical energy transducer, used to receive the resonance signal of the specimen. Driving circuit - provides audio sinusoidal electrical signal. Detection circuit - amplifies and displays the electrical signal from the receiver. Sample holder - place the sample.
Drive circuit
Detection circuit
2.2Industrial balance: sensitivity 0.1g.
2.3Vernier caliper: measuring range 0~200mm, accuracy 0.02mm. 3Sample
Exciter
Sample"
Receiver!
3.1Size: For electrodes with a diameter greater than or equal to 300mm, the sample size is 20mm in diameter and 160mm in length. For electrodes with a diameter less than 300mm, the sample size is 10mm in diameter and 120mm in length. Processing accuracy is ±0.1mm. 3.2Requirements: Parallelism is not greater than 0.1mm/100mm, and smoothness is √6. There are no visible cracks or flaws on the sample surface. 3.3Sampling position: Take a piece of bad material parallel to the extrusion direction at the center of the end of the electrode to be tested and process it into a sample. 3.4 Quantity: Take 6 electrodes per furnace (two electrodes are taken from the middle and two ends of the furnace core). 4 Test stepsbzxz.net
4.1 The sample must be baked in a drying oven at 110℃ for 2 hours and stored in a desiccator to cool to room temperature for use. 4.2 Measure the diameter, length and mass of the sample. Diameter measurement requires measuring three places along the axis of the sample, measuring each place twice, and the corresponding diameters of the two times are perpendicular to each other. Average the six measured data. Calculate the ratio of diameter to length, and determine the correction factor Cr according to this ratio. Issued by the General Administration of Standards of China on May 10, 1982
Implementation on March 1, 1983
GB 3074. 2-82
4.3 Turn on all instruments, preheat for 30 minutes, and use known stainless steel standards to identify whether the sensitivity and stability of the instruments are normal. 4.4 Carefully hang (place) the sample on the bracket, change the output frequency of the audio signal, make the sample resonate at the fundamental frequency, record the resonant frequency, then rotate the sample 90° around the axis and re-measure it, and take the average of the two measurements. 5 Calculation formula
The elastic modulus E (kg/cm2) of the sample is calculated as follows: accurate to one decimal place.
Where: E-elastic modulus, kg/cm2,
M mass, g
_-frequency, Hz,
~sample diameter, mm,
correction coefficient. Its value is shown in the table below.
6 Test report
The test report should include the following contents:
Sample number, specification and source.
Sample elastic modulus and its average value.
Additional instructions:
-X10-108
This standard is proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Shanghai Carbon Factory and mainly drafted by Yang Shugen.
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