Rapid self-correction indentation testing method of material testing machine

A material testing machine and fast technology, applied in the direction of testing material hardness, etc., can solve the problems of high frequency of indenter replacement, reduce the number of indenters used, high cost, etc., and achieve accurate indentation area, reduce use frequency, and calculate accurate. Effect

Active Publication Date: 2014-03-05
湖州市特种设备检测中心
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AI Technical Summary

Problems solved by technology

It not only ensures the accuracy of material testing, but also effectively reduces the number of times the indenter is used, and reduces the force on the indenter when it is wrongly loaded, and solves the problem of high frequency of indenter replacement and huge cost

Method used

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  • Rapid self-correction indentation testing method of material testing machine
  • Rapid self-correction indentation testing method of material testing machine
  • Rapid self-correction indentation testing method of material testing machine

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Embodiment Construction

[0036] Such as figure 1 The load-depth curve of a typical single indentation test shown shows that an indentation test has gone through three stages: loading stage, load holding stage, and unloading stage. , unit μm), the ordinate represents the load F (unit: mN) acting on the indenter; the load holding stage in the figure is not necessary for the indentation test, but the ordinate value of the highest point of the loading stage curve is the maximum load f max ; h max is corresponding to F max The indentation depth, that is, the maximum indentation depth; h r is the residual indentation depth, and S is the contact stiffness. Using the following algorithm process for such a curve, we can distinguish the conventional calculation method to obtain the more accurate mechanical property parameters we need: yield strength or tensile strength.

[0037] (1) Calculate the integral value of the loading section: Wt; the integral value of the unloading section: We

[0038] ...

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Abstract

The invention discloses a rapid self-correction indentation testing method of a material testing machine. A total confidence interval is established by analyzing mechanical property parameters and selecting a load-depth curve; the total confidence interval is used as reference basis of a tested material; when the load-depth curve of the tested material is within the total confidence interval, the testing does not need to be repeated, and the mechanical property parameters can be calculated according to the load-depth curve. The testing repetition rate is reduced, and the pressure head utilization rate is reduced, so that the effect of prolonging the service life of a pressure head is well achieved, and non-noticeable positive effects in aspects such as equipment inspection and fault judgment are achieved.

Description

technical field [0001] The invention relates to the field of material mechanical performance analysis, in particular to a self-correcting rapid indentation test method of a material testing machine. Background technique [0002] The existing method for obtaining material properties in material tests is the indentation method, also known as depth-sensing indentation technology, or depth-sensitive indentation technology. There are mainly ball indentation, triangular pyramid indentation, quadrangular pyramid indentation and flat bottom indentation. The traditional macroscopic test method of materials needs to implement multiple groups of different types of tests to obtain various mechanical performance parameters of the material, and the test cycle is long and expensive. The material testing machine using depth sensing indentation technology can determine the elastic modulus, yield strength, tensile strength and fracture strength of the material after obtaining the load-depth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/42
Inventor 钦峰谢国利郑玉卿杨洪亮施沈科
Owner 湖州市特种设备检测中心
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