GB/T 4966-1985 Determination of tensile strength of daily-use ceramics

This standard is applicable to the determination of the ultimate tensile strength of sintered samples of daily-use ceramics at room temperature. GB/T 4966-1985 Determination of tensile strength of daily-use ceramics GB/T4966-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination method of tensile strength of domestic ceramics
Standard test nethou for teslle streugthof domestic ceramic
This standard applies to the determination of the ultimate tensile strength of sintered specimens of domestic ceramics 1 Principle of the method
UDC 686.6*620www.bzxz.net
GB4966---85
According to the elastic theory, two concentrated loads in opposite directions and evenly distributed along the length of the specimen are applied in the diameter direction of the cylindrical specimen, and uniform tensile stress perpendicular to the plane is generated on the radial plane bearing the load. As this stress gradually increases, it eventually causes tensile fracture (see the figure below).
Pressure tank a
Schematic diagram of radial compression test
2 Equipment and tools
2.1 Pressure testing machine: range is 5ts
2.2 Grinding machine.
2.#The accuracy of the vernier caliper is 002mme
2. Get the vernier angle ruler and platform.
Pulling God is good
3 Sample preparation
3.1 The inspection unit shall prepare a regular sample with a diameter of D of 202mm and a length of L of 20±2mm (the diameter of the coarse pottery sample is 50±5mm and the length of L is 50±5mm) according to the production process conditions of the product. The number of samples to be inspected is 10. 3.2 The sample is not allowed to deform axially. Select a suitable load busbar on the sample. The non-parallelism of the two busbars is less than 0.10mn/cm. When the two bottom surfaces are uneven, they should be processed flat on the grinding machine, and the non-perpendicularity with the busbar is less than! 3.3 Clean the sample, remove the sample with obvious defects and obvious roundness error, accurately measure the sample size (accurate to 0.1m), number the sample and record the size, and dry it for use. Issued by the National Bureau of Standards on 1985-0#~01
Implemented on 1985-12-01
Life test conditions and steps
GB4966-85
4.1 For safe operation and to keep the equipment and site clean, protective work should be done before the test. #.2 According to the operating procedures of the testing machine, select the 51 range, adjust the instrument, and check the parallelism of the two pressure plates. When the pressure plate is uneven, pull it flat.
.3 The sample is placed horizontally in the middle of the pressure plate, and the two busbars and the pressure plate are padded with straw cardboard with a thickness of 1m. , load at a speed of X10*N/s (2×10\N/$ for coarse pottery), and accurately read and record the pressure value when the sample is ringed according to the accuracy of the pressure gauge.
Calculation results and data processing
5.1 The tensile strength limit value is calculated according to the following formula: 22
Where: - tensile strength limit, Nm
- pressure value when the sample breaks, N,
D- diameter of the cylindrical sample,
L- length of the cylindrical sample, m
5.2 The final result of the tensile strength limit is the average value of the measured values ​​of more than six samples, and the relative deviation is not more than 10%. 6 Test records
The test records include the source, name, number, size, maximum pressure indication, tensile strength limit measurement value, rejection, final inspection results, measurement date and tester of the sample. Additional notes:
This standard was proposed by the Ministry of Light Industry of the People's Republic of China and is under the technical jurisdiction of the Ceramics Research Institute of the Ministry of Light Industry. This standard was drafted by Yu Gui from the Hunan Liling Ceramics Research Institute. The main drafters of this standard are Xiao Weisi and Li Dawen. 8
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