GB/T 5166-1998 Determination of elastic modulus of sintered metal materials and cemented carbides

This standard is applicable to the determination of dynamic (adiabatic) elastic modulus of sintered metal materials and cemented carbides by longitudinal vibration method. GB/T 5166-1998 Determination of elastic modulus of sintered metal materials and cemented carbides GB/T5166-1998 Standard download decompression password: www.bzxz.net

GB/T 5166-1998
This standard is a revision of GB/T5166-1985 based on the international standard ISO3312:1987 "Determination of elastic modulus of sintered metal materials and cemented carbides". The technical content is equivalent to ISO3312:1987. This standard makes a few modifications to GB/T5166-1985, such as: "Surface roughness is R. ≤1.5um" is changed to "Surface roughness is R, ≤1.25 μm\, etc.
This standard will replace GB/T5166-1985 from the month of implementation. This standard was proposed by the State Bureau of Nonferrous Metals Industry. This standard is under the jurisdiction of the China Nonferrous Metals Industry Standard Metrology and Quality Research Institute. This standard was drafted by the Powder Metallurgy Research Institute of Central South University of Technology. The main drafters of this standard are Huang Zhifeng and Wang Lin. 269
GB/T5166—1998
ISO Forewordbzxz.net
ISO (International Organization for the Promotion of Standards) is a worldwide federation composed of national standardization bodies (ISO member bodies). The work of formulating international standards is completed by technical committees. If each member body is interested in the standard project established by a technical committee, it has the right to participate in the work of the technical committee. In terms of electrical technical standards, ISO) and the International The International Standard maintains a close cooperative relationship with the International Electrotechnical Commission (IEC). The draft international standard formally adopted by the technical committee is submitted to the member groups for voting. It must obtain the consent of at least 75% of the member groups participating in the voting before it can be formally adopted.
International Standard ISO3312 was developed by ISO/TC119 Powder Metallurgy Technical Committee. ISO3312:1987 replaces ISO3312:1975 and has made minor modifications. All international standards are subject to revision, so any reference to other international standards used refers to the latest edition unless otherwise stated.
1 Scope
National Standard of the People's Republic of China
Sintered metal materiais and hardmetals
Determination of elastic modulus
Sintered metal materiais and hardmetals-- Determination of Young's modulusGB/T 5166-—1998
idt ISO 3312:1987
Replaces 351661985
This standard applies to the determination of the dynamic (adiabatic) elastic modulus of sintered metal materials and hard alloys by the longitudinal vibration method. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/ T3850--1983 Density determination method for dense sintered metal materials and cemented carbide GB/T5957--1986 Sampling of sintered metal materials (excluding cemented carbide) GB/T6884--1986 Sampling and test method for cemented carbide products 3 Principle
Excite the sample with ultrasonic longitudinal vibration, and then determine its inherent resonant frequency. 4 Sampling and preparation of samples
4.1 Sampling of sintered metal materials shall be carried out in accordance with GB/T5957. Sampling of cemented carbide shall be carried out in accordance with GB/T6884. 4.2 The length of the sample shall be at least 60mm, and it can be a circular or rectangular cross-section. The cross-sectional diameter of the circular sample is 6mm+0.2mm, and the cross-sectional diameter of the rectangular sample is (6mm±0.2mm)X(8mm±0.2mm). 4.3 The surface layer should be removed by at least 0.1mm in thickness, and the surface roughness shall be R≤1.25μm. 4.4 Both ends of the sample are polished, and the parallelism is within 0.02mm. 4.5 The sample has no surface cracks and other structural defects, and the surface must be cleaned before the test. 5 Equipment
5.1 Fixture for installing the sample.
5.2 Ultrasonic oscillator, the oscillation frequency is between 20 and 100kHz. 5.3 Device for measuring the resonant frequency.
6 Steps
6.1 Determine the density of the sample according to GB/T3850, with an accuracy of 0.01g/cm. 6.2 Measure the length of the sample, with an accuracy of 0.1mm. 6.3 Install the sample on the equipment and steadily increase the frequency of the oscillator. Determine the resonant frequency, with an accuracy of 50Hz. Approved by the State Administration of Quality and Technical Supervision on December 15, 1998 and implemented on August 1, 1999
7 Expression of results
7.1 The elastic modulus is calculated according to formula (1):
Where: E—
elastic modulus, MPa;
length of the specimen, mm;
density of the specimen, g/cm;
-natural vibration frequency, Hz.
The reported results are rounded to 5×10°MPa.
Test report
The test report shall include the following contents:
a) the number of this standard;
b) the necessary instructions for identifying the specimen;
c) the test results;
d) any circumstances that may affect the results.
GB/T 5166—1998
E = 4 × 10-9 × L2 0: f2
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