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Metal ultrasonic fatigue testing method of uniform cross section segment-containing plate-shaped sample

A fatigue test, constant section technique, applied to the analysis of solids with sonic/ultrasonic/infrasonic waves in the same direction

Active Publication Date: 2016-02-03
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention mainly solves the following three problems:

Method used

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  • Metal ultrasonic fatigue testing method of uniform cross section segment-containing plate-shaped sample
  • Metal ultrasonic fatigue testing method of uniform cross section segment-containing plate-shaped sample
  • Metal ultrasonic fatigue testing method of uniform cross section segment-containing plate-shaped sample

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Embodiment 1

[0136] Taking a steel material for automobile plates as an example, it is assumed that the dimensional accuracy is controlled very well during the sample processing.

[0137] 1. Measure the elastic modulus E=206GPa, density ρ=7850kg / m 3 .

[0138] 2. Design the sample size. The preset axial tension and compression specimens are plate-shaped ultrasonic fatigue specimens with equal cross-section sections, such as image 3 Shown. First draw up its size parameters, L 1 =12.5mm, L 2 =20mm, b 1 = 3mm, b 2 =10mm, b 1 Is the thickness of the plate equal section section, b 2 Is the thickness at both ends of the board, L 1 Is half of the length of the plate equal section section, L 2 Is the length of the variable section of the plate. When calculating, convert all the known parameters into dimensional units of mm, g, ms, and calculate the length L at both ends of the sample by the formula (4) to calculate the length at both ends of the plate-shaped sample 3 = 11.13mm, the transition arc rad...

Embodiment 2

[0144] Take the same steel material for automobile plates as in Example 1. It is assumed that the dimensional accuracy is not well controlled during the processing of the sample, and the surface is polished after the sample is processed, resulting in a large deviation between the actual size of the sample and the design size .

[0145] 1. Measure the elastic modulus E=206GPa and density ρ=7850kg / m of the steel material for automobile plates 3 .

[0146] 2. Design the sample size. The preset axial tension and compression specimens are plate-shaped ultrasonic fatigue specimens with equal cross-section sections, such as image 3 Shown. First draw up its size parameters, L 1 =12.5mm, L 2 =20mm, b 1 = 3mm, b 2 =10mm, b 1 Is the thickness of the equal section of the plate, b 2 Is the thickness at both ends of the board, L 1 Is half of the length of the plate equal section section, L 2 Is the length of the variable section of the plate. When calculating, convert all the known parameters...

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Abstract

The invention discloses a metal ultrasonic fatigue testing method of a uniform cross section segment-containing plate-shaped sample. The method comprises the following parts: a first part, firstly, according to density and elastic modulus of a test material, and a dimension designing formula of the uniform cross section segment-containing plate-shaped ultrasonic fatigue sample under a axial tension-compression loading is calculated by analysis; a second part, a stress transformation formula between the uniform cross section segment-containing plate-shaped sample and an arc-shaped sample is derived, a stress of the uniform cross section segment-containing plate-shaped ultrasonic fatigue sample is transformed into a stress corresponding to the arc-shaped sample on a system control software, and a ultrasonic fatigue test control of the uniform cross section segment-containing plate-shaped sample is completed by using existing equipment and software; a third part, a stress correction formula is derived, when a deviation exists between an actual size and a design size of the uniform cross section segment-containing plate-shaped sample, so that more accurate test control is guaranteed. The method is suitable different metal materials, and the cover range is wide; the method can be used for completing an ultra-high cycle fatigue test of the uniform cross section segment-containing plate-shaped sample, upgrade is not needed, and the cost is saved.

Description

Technical field [0001] The invention relates to the field of ultrasonic fatigue performance testing of metal materials, in particular to a metal ultrasonic fatigue testing method containing plate-shaped specimens with equal cross-section sections. Background technique [0002] Fatigue is a phenomenon in which structural materials form cracks after a certain number of cycles under cyclic loading, or the cracks further expand until they are completely broken. Statistics show that more than 80% of structural strength failures are caused by fatigue, so the fatigue performance testing and research of materials are of great significance. Traditional fatigue performance research generally takes 10 7 As the limit cycle. In fact, some high-strength steels used in key components or structural steels subjected to high-frequency loads often have an actual service life of 10 8 ~10 10 Weeks, more and more results have confirmed that many engineering steels are in 10 7 Fatigue fracture still o...

Claims

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Application Information

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IPC IPC(8): G01N29/12
Inventor 彭文杰薛欢陈一鸣刘冬严龙曾永龙张彦文
Owner 武汉钢铁有限公司
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