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Creep experimental device and test method based on gravity loading three-point bending

A technology of gravity loading and experimental device, applied in the field of creep mechanics, can solve the problems of limiting the stability and accuracy of the device, having a large influence on the measurement results, and being difficult to be extended to engineering applications, so as to avoid load fluctuations, reduce the time cost, and improve the The effect of measurement accuracy

Active Publication Date: 2018-07-31
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal expansion deformation and high-temperature creep deformation of high-temperature devices and fixtures have a great influence on the measurement results, which limits the stability and accuracy of the device
At the same time, this test method requires many sets of samples to measure the creep performance parameters of materials under different stresses, which is difficult to be extended to engineering applications

Method used

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  • Creep experimental device and test method based on gravity loading three-point bending
  • Creep experimental device and test method based on gravity loading three-point bending
  • Creep experimental device and test method based on gravity loading three-point bending

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This example describes a creep experiment of a three-point bending specimen at room temperature.

[0065] Put the three-point bending sample 14 (the size is 60×2×15mm, and the material is copper alloy) into the left support pin 18 and the right support pin 13 at the bottom of the clamping base groove 19, and place the upper cover plate 15 in sequence , The upper loading pin 16 and the lower loading pin 17 complete the assembly of the clamping system. Put the clamping system into the slot of the loading base 11. On the loading base 11, install the fixed support base rod 7, the loading rod 4, the loading bracket 6 and the weight hanger 1 in sequence, adjust the position and height of the loading bracket 6, so that the lower end of the loading bracket 6 is in line with the upper loading Centering contact of the pin 16; since the device adopts the weight hanger 1 for placing the weight 2, together with the loading bracket 6, a leverage is formed through the loading rod 4 t...

Embodiment 2

[0084] This example describes a creep test of a three-point bending specimen at 200°C.

[0085] Put the three-point bending sample 14 (60×2×15mm in size, made of aluminum alloy) into the left support pin 18 and right support pin 13 at the bottom of the clamping base groove 19, and place the upper cover plate 15 in sequence , The upper loading pin 16 and the lower loading pin 17 complete the assembly of the clamping system. Put the clamping system into the slot of the loading base 11. On the loading base 11, install the fixed support base rod 7, the loading rod 4, the loading bracket 6 and the weight hanger 1 in sequence, adjust the position and height of the loading bracket 6, so that the lower end of the loading bracket 6 is in line with the upper loading Centering contact of the pin 16; since the device adopts the weight hanger 1 for placing the weight 2, together with the loading bracket 6, a leverage is formed through the loading rod 4 to realize the three-point bending o...

Embodiment 3

[0088] This example describes a creep test of a three-point bending specimen at 400°C.

[0089]Put the three-point bending sample 14 (size 60×2×15mm, material is steel) into the left support pin 18 and right support pin 13 at the bottom of the clamping base groove 19, and place the upper cover plate 15, The upper loading pin 16 and the lower loading pin 17 complete the assembly of the clamping system. Put the clamping system into the slot of the loading base 11. On the loading base 11, install the fixed support base rod 7, the loading rod 4, the loading bracket 6 and the weight hanger 1 in sequence, adjust the position and height of the loading bracket 6, so that the lower end of the loading bracket 6 is in line with the upper loading Centering contact of the pin 16; since the device adopts the weight hanger 1 for placing the weight 2, together with the loading bracket 6, a leverage is formed through the loading rod 4 to realize the three-point bending of the gravity loading ...

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Abstract

The invention discloses a creep experimental device and test method based on gravity loading three-point bending. The creep experimental device includes a loading bracket and a mounting clamping system. The loading bracket mainly includes a loading base, a fixing supporting base rod, a loading rod, a loading bracket, a weight hanger and weights. A sample is placed in the mounting clamping system,and the sample is placed in a clamping slot of the loading base. The loading bracket is in contact with the upper end surface of the sample, and works together with the weight hanger to form lever effects through the loading rod, and the gravity loading three-point bending of the sample is achieved; on the one hand, the test method utilizes second derivative of bending deflection of the three-point bending sample, on the other hand, the linear progressive law of the normal stress of the section of the three-point bending sample is used, simultaneous measurement of creep deformation at high temperature is not required, and creep performance parameter tests corresponding to different stress levels can be achieved with a single group of samples.

Description

technical field [0001] The invention belongs to the technical field of creep mechanics, and in particular relates to a creep experiment device and a test method based on gravity-loaded three-point bending. Background technique [0002] Creep is a concern in fields such as petroleum, chemical, aerospace and nuclear power, which can cause deformation and fracture of components. Applying the theory of creep mechanics to accurately establish the creep model of materials is of great significance to ensure the accuracy, durability and service life of key load-bearing components. [0003] The basic premise of accurately establishing the material creep model is to establish accurate and effective creep experiment equipment and testing methods. At present, the commonly used traditional creep test method is the uniaxial tensile creep test method. Since the development of the uniaxial tensile creep test method, the relevant technologies have matured, and the test method, sample size,...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N3/06
CPCG01N3/06G01N3/068G01N3/18G01N2203/0033G01N2203/0071G01N2203/0226
Inventor 汤金钢孔金星黄文杜东兴王立航马绍兴陈一魏巍黄小津
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS