This standard specifies the test equipment, test specimens, test procedures, result calculation and data processing for the determination of room temperature flexural strength of ceramic materials by the three-point load method. This standard is applicable to ceramic materials and auxiliary materials for ceramics such as saggers. GB/T 4741-1999 Test method for flexural strength of ceramic materials GB/T4741-1999 Standard download decompression password: www.bzxz.net

GB/4741-1999
This standard is revised according to GB/T1.1--1993α Guidelines for Standardization Unit 1: Rules for Drafting and Presentation of Standards Part 1: Basic Provisions for Standard Writing. The main revisions are as follows: - Added Chapter Scope.
- In Chapter 3, the basic requirements for equipment are clarified. In Chapter 4, the shape and specifications of the sample are clearly specified. Except for the product cutting link in the sample preparation. - In Chapter 5, the test steps are simplified.
- In Chapter 6, legal measurement units are added to parameters such as strength values, and the rounding range of strength values ​​is specified. From the date of implementation, this standard will replace GB/T4741-1984. This standard is proposed by the State Bureau of Light Industry.
This standard is technically managed by the National Ceramic Standardization Center. The responsible drafting unit of this standard: China Light Industry Association Ceramic Research Institute. The main drafters of this standard: Xu Lihua, Zhang Pei. 75
1 Scope
National Standard of the People's Republic of China
Test method for bending strength of ceramic materials
Standard test method for bending strength of ceramic materlalsGB/T 4741-1999
Replaces GB/T4741--1984
This standard specifies the test equipment, test specimens, test procedures, result calculation and data processing for determining the room temperature bending strength of ceramic materials by the three-point load method.
This standard is applicable to ceramic materials and auxiliary materials for ceramics such as saggers. 2 Definitionsbzxz.net
This standard adopts the following definitions.
Bending strength limit
The maximum stress when the specimen is subjected to static bending force to failure, expressed as the ratio of the bending force applied to the specimen at failure to the section modulus at the fracture.
3 Equipment
3.1 Bending strength testing machine: relative error is not more than 1%, can load at a constant speed, loading and support blade diameter is 10mm ± 0.1mm. 3.2 Vernier caliper: accuracy is 0.2mm.
3.3 Oven: can keep warm at 110℃ ± 5℃. 3.4 Dryer.
3.5 Balance: sensitivity is 0.1g.
4 Sample
4.1 10 rectangular samples with a length of 120mm and a width-to-thickness ratio of 1*14.2 The preparation of the sample adopts the same process conditions as the actual production of the material. 4.3 The sample must be processed neatly and no obvious defects are allowed. 5 Test steps
5.1 Place the sample in an oven at a temperature of 110C ± 5℃, dry it to constant weight, and then put it in a dryer to cool to room temperature. 5.2 Place the sample on the support blade, adjust the distance between the support blades, make the length of the sample outside the support blade is 10mm, the two support blades must be in the same plane and parallel to each other, and make the loading blade be located in the middle of the two support blades. 5.3 Turn on the bending strength tester. Note that the loading blade should not impact the sample when it contacts the sample, and load at an average speed of 10~50N/s (for samples with lower bending strength, please choose a lower loading speed) until it is destroyed. Record the maximum load when the sample is destroyed. 5.4 Use a vernier caliper to measure the width and thickness of the sample at the fracture, accurate to 0.1mm. Approved by the State Administration of Quality and Technical Supervision on August 12, 1999, No. 76. Implementation on February 1, 2000. 6 Calculation of results and data processing. 6.1 The flexural strength is calculated according to formula (1): Where: - flexural strength, MPa; F - load when the specimen breaks, N, L - distance from the supporting knife edge, mm; 6 Width of the specimen at the fracture, mm; h - thickness of the specimen at the fracture + mm.
6.2 Data processing
GB/T 4741—1999
6.2.1 When the maximum relative deviation is greater than 10%, discard the specimen with the largest relative deviation, and then recalculate the remaining values ​​until it meets the requirements. The maximum relative deviation is calculated according to formula (2): LAmax(Amin)-A)
R(%) = 1
Where: R--maximum relative deviation,%;
Amax--maximum value;
Anin--minimum value;
-average value.
6.2.2 If the discarded samples reach 4% of the total number of samples, re-samples should be prepared for testing. x100
6.2.3 The arithmetic mean of the valid samples is used as the flexural strength value of the sample, and the data is rounded to 0.1MPa. 7 Test report
7.1 Sample delivery unit, sample name, and sample number. 7.2 Specimen span, loading speed, section thickness, section width. 7.3 Data discarded, bending strength value. 7.4 Test date, tester, test unit. (2)
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