Device and method of measuring yield strength and strain hardening exponent of metal material by indentation method

A technology of strain hardening index and yield strength, which is applied in the direction of measuring devices, testing material hardness, analyzing materials, etc., can solve the problems of failure to find and less test data, and achieve the effect of improving accuracy and improving experimental work efficiency

Pending Publication Date: 2018-03-30
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultrasonic nondestructive testing technology mainly uses reflected waves and other types of waves generated by the interaction between ultrasonic waves and specimens to test material properties. law

Method used

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  • Device and method of measuring yield strength and strain hardening exponent of metal material by indentation method
  • Device and method of measuring yield strength and strain hardening exponent of metal material by indentation method
  • Device and method of measuring yield strength and strain hardening exponent of metal material by indentation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as figure 1 and figure 2 As shown, the device for measuring the yield strength and strain hardening index of metal materials by the indentation method includes a servo motor 2, a pressure pusher 5 and a horizontal plate 7 connected sequentially from top to bottom, and the servo motor 2 and the pressure pusher 5 are connected by bolts 3 connection, the pressure propeller 5 and the horizontal plate 7 pass through the fixing bolt 6; the pressure propeller 5 is provided with a pressure rod 10, which is driven by the servo motor 2, and the upper end of the servo motor 2 is provided with a rear axle 1, and the pressure rod 10 passes through the horizontal Plate 7 and pressure sensor 9, the lower end is provided with pressure rod base plate 11, and pressure rod base plate 11 is connected with pressure head base 12 through opening four threaded holes in the bottom, and pressure head base 12 lower end is screwed with pressure head connecting rod 13, pressure head A diamon...

Embodiment 2

[0089] Experimental validation of new materials with known elastoplastic parameters:

[0090] Two materials, SUS304 and SK4, were simulated indentation experiments to obtain load-depth curves, see Figure 8a and Figure 8b . Select two maximum indentation depths as h g1 / R=0.04 and h g2 The load-depth data when / R=0.06 is substituted into Example 1 to obtain the corresponding apparent strain. From the coefficients of the corresponding dimensionless functions determined in Example 1, the corresponding two apparent stresses can be obtained, and finally substituted into the mechanical model (5) to calculate the yield strength σ of the material y and strain hardening exponent n, the obtained yield strength and strain hardening exponent results are compared with the real data results of raw materials, see Table 3, and the maximum error is no more than 7%.

[0091] table 3

[0092]

Embodiment 3

[0094] On the basis of Embodiment 1, a V-shaped window is established on the side plate 4, such as Figure 9a and 9b as shown, Figure 9a It is that the side plate has a square window in embodiment 1, Figure 9b Open a V-shaped window. Through the V-shaped window, the object to be inspected with a curved surface such as a pipe can be placed on the V-shaped window on both sides of the plate, so that the object to be inspected can be used as a limit. During the process of pressing the indenter, there will be no move.

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Abstract

The invention discloses a device of measuring yield strength and a strain hardening exponent of a metal material by an indentation method. The device comprises a servo motor, a pressure propeller anda transverse plate that are sequentially connected from the top down, wherein the pressure propeller is internally provided with a pressure rod; the pressure rod is driven by the servo motor and penetrates through the transverse plate and a pressure sensor; a pressure rod bottom plate is arranged at the lower end of the pressure rod; the lower part of the pressure rod bottom plate is sequentiallyconnected with a pressure head base, a pressure head connecting rod and a pressure head; four corners of the transverse plate are connected with a magnetic pressure platform via side plates; the servomotor and the pressure sensor are connected with a computer; and the yield strength and the strain hardening exponent are calculated by a load-displacement curve. According to the device, the computer controls the motor to allow output displacement of the motor to be capable of accurately tracking and reproducing input displacement; nondestructive and micro-destructive measurement of a measured object to be detected are achieved; and mechanical properties of the metal material are characterized by the micro-load continuous indentation method by taking a load and depth in an indentation process as response values.

Description

technical field [0001] The invention relates to a device for measuring the mechanical properties of metal materials, in particular to a device and method for measuring the yield strength and strain hardening index of metal materials by using an indentation method. Background technique [0002] Pressure-bearing equipment is widely used in petroleum, chemical, nuclear power, aviation and other fields, and these equipment often serve in complex environments such as corrosive media, high temperature and high pressure, and their materials often suffer from corrosion, creep, fatigue, cracking, etc. A security incident occurred. In recent years, people have paid special attention to the safety and reliability of pressure-bearing equipment. The core is how to accurately predict the remaining life of pressure-bearing equipment. The key is to grasp the real mechanical properties of materials, including the yield strength and strain hardening exponent of metal materials. and other imp...

Claims

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Application Information

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IPC IPC(8): G01N3/42
CPCG01N3/42G01N2203/0078
Inventor 赵建平王占宇金桩戴洪飞
Owner NANJING UNIV OF TECH
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