Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A rapid evaluation method for low-cycle fatigue performance of ultra-thin automotive steel plates

A low-cycle fatigue, automotive steel plate technology, applied in the direction of strength characteristics, instruments, and the use of repetitive force/pulse force to test the strength of materials, etc., can solve the problems of the accuracy of the test results, the increase of material consumption, etc., to achieve a simple test process. Fast and cost-effective experimental material

Active Publication Date: 2019-12-03
NORTHEASTERN UNIV LIAONING
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method not only increases the amount of material by five times, but also the use of adhesive between steel plates is easy to affect the accuracy of test results
In addition, some researchers have carried out uniaxial tension-compression fatigue loading experiments by designing different anti-buckling devices or using non-contact strain measurement methods, but there are still problems such as how to measure strain and the accuracy of strain measurement.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A rapid evaluation method for low-cycle fatigue performance of ultra-thin automotive steel plates
  • A rapid evaluation method for low-cycle fatigue performance of ultra-thin automotive steel plates
  • A rapid evaluation method for low-cycle fatigue performance of ultra-thin automotive steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Carry out cantilever beam symmetrical bending fatigue loading on a DP590 steel sheet with an original thickness of 2 mm, determine the thickness range of the cantilever beam bending fatigue loading sample according to step S1, and design the thin foil size according to step S11: 1:11mm, l 0 : 3mm, w: 3.5mm, measure the average grain size of ferrite as d=9.5μm; calculate the number of grains passing through the first stage of fatigue crack propagation by step S12, Y≈1, σ y '≈400MPa, Δσ value is about 400~450MPa, calculated as i=3~4; from step S13, if the plate is subjected to tension-compression symmetric fatigue loading, calculate the number of grains that the crack propagates through in the second stage j≈2000 / 9.5≈210; combined with steps S14, S15 and S16, the value range of m is 2.5-4, and the calculated thickness range of the thin foil sample is t=60-160 μm. Then proceed to step S2, from step S21, select the thin foil thickness as 50 μm, 100 μm, 150 μm, 200 μm; est...

Embodiment 2

[0092] Carry out cantilever beam symmetrical bending fatigue loading on a DP steel sheet for automobiles with an original thickness of 2mm and a martensite volume fraction of 14%, determine the thickness range of the cantilever beam bending fatigue loading sample according to step S1, and design according to step S11 Thin foil size: l: 11mm, l 0 : 3mm, w: 3.5mm, measure the average grain size of ferrite as d=9.5μm; calculate the number of grains passing through the first stage of fatigue crack propagation by step S12, Y≈1, σ y '≈400MPa, Δσ value is about 400~450MPa, calculated as i=3~4; from step S13, if the plate is subjected to tension-compression symmetric fatigue loading, calculate the number of grains that the crack propagates through in the second stage j≈2000 / 9.5≈210; combined with steps S14, S15 and S16, the value range of m is 2.5-4, and the calculated thickness range of the thin foil sample is t=60-160 μm. Then proceed to step S2, from step S21, select thin foil th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for rapid evaluation of low-cycle fatigue performance of ultra-thin automotive steel plates. The method evaluates the low-cycle fatigue of such materials through the fatigue life test results of thin foil samples of the plate under the cantilever beam symmetrical bending fatigue loading mode. life. By establishing the relationship between the bending deflection and maximum strain of the thin foil specimen and selecting the thickness of the thin foil specimen, the fatigue loading and fatigue life evaluation of the strain-controlled ultra-thin automotive steel plate is achieved. The invention can test the fatigue cycle life of ultra-thin automobile steel plates under large strain conditions, and provides a rapid evaluation method for ultra-thin automobile steel plates that are difficult to obtain low-cycle fatigue life testing under axial tension-compression fatigue loading conditions. The present invention can be further expanded and applied to the low-cycle fatigue performance evaluation of other ultra-thin metal plates that are difficult to conduct axial tension-compression fatigue loading experiments.

Description

technical field [0001] The invention belongs to the technical field of steel plate low-cycle fatigue performance measurement, and relates to a rapid evaluation method for low-cycle fatigue performance of ultra-thin automotive steel plates. Background technique [0002] Among the materials used in automobiles, the amount of steel plates accounts for a considerable proportion. With the introduction of the concept of automobile lightweight, the industry reduces the thickness of the steel plate to reduce the weight of the car body, thereby reducing power consumption such as oil and electricity, and at the same time reducing automobile exhaust emissions and energy consumption. However, the thinning of automotive plates poses challenges to the strength, toughness, impact resistance and fatigue resistance of materials, especially the impact of the fatigue resistance of automotive plates on the safety of automobiles in service, and with the reduction of steel plate thickness, The e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0066G01N2203/0073
Inventor 张滨马振华
Owner NORTHEASTERN UNIV LIAONING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com