How to carry out the relevant test of the tensile strength testing machine How to carry out the relevant testing of the tensile strength testing machine First, first query the basic structural affairs and operation methods of the testing machine, and learn the operating procedures of the experimental machine. According to the strength limit of the mild steel and the cross-sectional area of ​​the test piece, the maximum load required for the tensile test piece is initially estimated, the appropriate force measuring disk is selected, and the pendulum of the echo is provided, and the head is turned on, and the force pointer is adjusted to “Zeroâ€, then adjust the position of the collet under the test machine and clamp the specimen in the collet.
Preparation of the test piece: The all-round test machine takes the gauge length in the middle part of the test piece or punches the eye on the end of the test piece with the foot mark as the mark, and uses the vernier caliper to measure the diameter of the middle and the end at the three ends of the test piece within the limitation of the test piece. The value is used as the cross-sectional area of ​​the test piece.
Second, the universal testing machine related tests, allowing customers to help the performance and quality of the universal testing machine when purchasing the universal testing machine, so that customers no longer worry about the quality of the universal testing machine and product problems.
3. The fracture of the fractured test piece is pressed together, and the diameter of the fracture is measured by the vernier caliper to calculate the area; the cross-section shortening rate of the low carbon steel can be calculated by the following formula, from the damaged low carbon steel test piece. It can be seen that the residual elongation of the ground is not evenly distributed. The closer the fracture is, the larger the deformation is. The farther the fracture is, the smaller the deformation is. Therefore, the measured value is related to the location of the fracture. For the calculation of the consistent value, the rule is to measure the value of the fracture in the middle of the gauge length. If the fracture is not in the section, the demand is converted by the method of the fracture shift. The method is as follows: There is a grid between the punctuation and the distance between the grids before stretching. On the longer right segment of the fracture specimen, starting from a line near the fracture, the grid is drawn to the right, marked as Put the break in the middle of the gauge length, and then look at the point to the point, there are many grids, and the same number of grids are taken from the point to the left, marked with a mark, so that the length of the leak is displayed, and the number of cells included in the length is equal to the gauge length. The number of cells in the length. When the fracture is very close to the ends of the test piece and the distance from the head is equal to or less than twice the diameter, the all-round test machine generally believes that the execution result is invalid and the demand is re-executed.
Fourth, the testing machine needs to carry out relevant tests at the time of purchase, and in various industries, there is very little mastery of the universal testing machine. In view of how to conduct relevant tests on the universal testing machine, some technicians will simply describe it, so that people in more industries can understand the testing of the universal testing machine.
5. Execution: After the test piece is clamped, the test piece is slowly and evenly loaded, and the relationship between the external force and the deformation is plotted by the automatic drawing device on the experimental machine. When the load is added to the point, the upper part of the stretched figure is a straight line indicating the load in this stage. The proportional relationship with the variable composition of the test piece is in line with the elastic deformation limitation of Hooke's law. When the load is added to the point, the dynamometer pointer stays still or suddenly drops to the point and then swings within a small limit. The deformation is added very quickly, and the load is added very slowly; this indicates that the material has a motion and a point response. The upper motion limit and the corresponding stress are called the light swaying limit. Because the light swaying limit is relatively constant, the material's motion limit is based on the light swaying limit. The corresponding load value is divided by the original cross-sectional area of ​​the test piece. Obtain the movement limit of low carbon steel. After the movement stage, the test piece should withstand more external force, and then continue to deform. If the plastic deformation is to be increased, it is necessary to add a load. For example, the point to the point in the figure is the strengthening stage. When the load reaches the maximum point, the plastic deformation of the test piece is concentrated in a small section at a certain section, and the section is shortened, that is, the phenomenon of "necking" occurs. Finally, we need to block the machine. Take the broken test piece and press the broken test piece together. Use the vernier caliper to measure the length between the test piece gauge length. The following formula can be used to calculate the elongation of the low carbon steel. Http://news.chinawj.com.cn Submission:
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