Ultrasonic Fatigue Test Method for Metals with Plate Specimens Containing Equal Section Sections
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A fatigue test, constant section technique, applied to the analysis of solids with sonic/ultrasonic/infrasonic waves in the same direction
Active Publication Date: 2018-10-09
武汉钢铁有限公司
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Embodiment 1
[0136] Taking a steel material for automobile sheets as an example, it is assumed that the dimensional accuracy is well controlled during the processing of the sample.
[0137] 1. Measure the elastic modulus E=206GPa and the density ρ=7850kg / m of steel materials for automobile panels 3 .
[0138] 2. Design the sample size. The preset axial tension and compression specimens are plate-shaped ultrasonic fatigue specimens with equal cross-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 section of the plate, b 2 is the thickness at both ends of the plate, L 1 is half of the length of the constant section section of the plate, L 2 is the variable section length of the plate. When calculating, convert all known parameters into mm, g, ms dimensional units, and calculate the length L at both ends of the sample from the calculation formula of the length at both ends of...
Embodiment 2
[0144] Taking the same steel material for automobile sheets as in Example 1 as an example, it is assumed that the dimensional accuracy is not well controlled during the processing of the sample, and the actual size of the sample deviates greatly from the design size due to surface grinding after the sample is processed .
[0145] 1. Measure the elastic modulus E=206GPa and the density ρ=7850kg / m of steel materials for automobile panels 3 .
[0146] 2. Design the sample size. The preset axial tension and compression specimens are plate-shaped ultrasonic fatigue specimens with equal cross-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 section of the plate, b 2 is the thickness at both ends of the plate, L 1 is half of the length of the constant section section of the plate, L 2 is the variable section length of the plate. When calculating, convert all known p...
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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 test method with plate-shaped samples with equal cross-section sections. Background technique [0002] Fatigue phenomenon is a phenomenon in which structural materials form cracks or further expand cracks until they are completely broken after a certain number of cycles under cyclic loading. Statistics show that more than 80% of structural strength failures are caused by fatigue, so the fatigue performance testing and research of materials is 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 years. 8 ~10 10 Weeks, more and more results have also confirmed that many engineering steels in 10 7 Fatigue fra...
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