Metal Tensile Test Sample: GB 6397-86
Tensile testing is an important part of understanding a material’s properties, such as its ability to be formed, hardened and welded. This article focuses on the use of GB 6397-86, a standard metal tensile test sample designed to evaluate mechanical properties such as yield strength, tensile strength, and elongation.
The sample of GB 6397-86 is a standard rectangular bar with a standard cross section that measures 4 mm x 15 mm for low carbon steel and 6 mm x 15 mm for high carbon steel. Two round ends of the sample have been machined off, leaving an un-machined gage length of 30 mm between the two machined surfaces. The two surfaces are then calibrated in a special machine which measures the force, elongation and specimens cross section. With the proper calibration, the results can be compared to other samples to find out how the desired properties were achieved.
In order to make the tensile test sample match the requirements of GB 6397-86, it should be made with the right materials and machined properly. Firstly, the bar should be made of either steel with the required speculations or another type of metal in order to capture the material’s natural elasticity, quenched and tempered to the desired hardness. Secondly, it is necessary to make sure that the samples gage length and cross section are correct and that there are no abrasions or defects on the machined surfaces. Additionally, it is also important to ensure that the samples used have been stored in the correct environment and have not been exposed to a temperature or humidity that could alter the measurements of the test.
Completed with the right test sample, the tensile test can then be conducted. The sample is clamped in the appropriate fixture and measurement machines. A force is then applied at a controlled rate until the specimen fractures. Throughout the test, it is of utmost importance that the conditions remain the same and the force is applied at a steady rate. During the test, the load is continuously monitored and the resulting strain, displacement, and load are recorded.
After the test is completed, the results are used to calculate the material’s ultimate strength and ductility. This data is then used to make decisions about strength, manufacturability and application of the material. GB 6397-86 metal tensile test sample standardized the way the test is perform, and as long as it is made with the correct materials and machined properly, manufactures can use this sample confidentially.
