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

A variable-amplitude ultra-high cycle fatigue life prediction method for high-strength metal materials

A fatigue life prediction, metal material technology, applied in the direction of analyzing materials, testing material hardness, using repetitive force/pulsation force to test material strength, etc., can solve problems such as lack of theoretical basis, difficult application, immaturity, etc. Simple, fast and clear thinking

Active Publication Date: 2020-07-14
山东龙旷金属制品有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ultra-high-cycle fatigue of high-strength metal materials, ultra-high-cycle fatigue damage is a nonlinear damage feature, fatigue crack initiation life is the main part, and the linear cumulative damage theory is not applicable
Considering the nonlinear characteristics of fatigue damage, researchers introduced nonlinear factors for correction on the basis of linear cumulative damage theory, but lack of theoretical basis
Fatigue nonlinear damage mechanics life models, such as the Chaboche damage mechanics model, are mainly used to study the evolution of fatigue damage under constant amplitude loads. The fatigue life prediction model based on Chaboche damage mechanics under variable amplitude loads is still immature, and many parameters need to be determined , it is difficult to apply in engineering

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 variable-amplitude ultra-high cycle fatigue life prediction method for high-strength metal materials
  • A variable-amplitude ultra-high cycle fatigue life prediction method for high-strength metal materials
  • A variable-amplitude ultra-high cycle fatigue life prediction method for high-strength metal materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Taking the TA15 titanium alloy as an example, the specific steps of the variable-amplitude ultra-high cycle fatigue life prediction method based on damage mechanics are as follows:

[0031] (1) Design and process high-strength metal material ultrasonic fatigue smooth specimen, marked as specimen 1, conduct ultra-high cycle fatigue test on specimen 1 by ultrasonic fatigue method, test frequency 20kHz, obtain material fatigue strength-life data, and draw material Fatigue S-N curve, obtain parameters S=130 and S 1 =3, where S is the fatigue damage strength of the material, S 1 is a nonlinear cumulative parameter;

[0032] (2) Perform a tensile test on specimen 1 with a loading rate of 0.0002s -1 , draw the tensile curve of specimen 1, and according to the tensile curve, the elastic modulus E=110GPa, hardening coefficient k=1634, material parameter C=0.6E / k=40.4, tensile strength σ b =367MPa;

[0033] (3) Then carry out metallographic treatment on specimen 1, select the...

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
elastic modulusaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a damage mechanics-based high-strength metal material amplitude variation ultra-high cycle fatigue life predication method. The method is based on an ultra-high cycle fatigue test result and a damage mechanics model, and the high-strength metal material amplitude variation ultra-high cycle fatigue life predication method is provided. The ultrasonic fatigue test is used to rapidly acquire the ultra-high cycle fatigue performance of a high-strength metal material, the test frequency is 20 kHz, only 13.9 hours are needed to finish 109 cycles; based on the nonlinear damagemechanics theory, a damage factor of the amplitude variation stress level is introduced, a material amplitude variation ultra-high cycle fatigue life predication model is established, and the ultra-high cycle fatigue life is quantitatively predicated on amplitude varied load. The thought of the assessment model is clear, and the computation is simple and fast.

Description

technical field [0001] The invention belongs to the field of engineering structure fatigue, and relates to a method for predicting fatigue life of metallic materials with variable amplitude ultra-high cycles based on damage mechanics. Background technique [0002] High-strength metal materials, such as high-strength metal materials, have the advantages of high strength and light weight, high temperature resistance, corrosion resistance and excellent formability, and are widely used in aeronautical structures, aeroengine compressor blades, steam turbine blades and other fields. The high-strength metal structure bears high-frequency vibration fatigue loads during high-speed operation, and can withstand cyclic loads of up to 10 during long-term service. 9 Week times, that is, ultra-high cycle fatigue. In the actual service process, high-strength structures are often subjected to variable-amplitude loads, which have a significant impact on ultra-high cycle fatigue damage of mat...

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): G01N3/32G01N29/04G01N3/08G01N3/40
CPCG01N3/08G01N3/32G01N3/40G01N29/04G01N2203/0073G01N2203/0216
Inventor 聂宝华陈东初邓锡凤钟碧琪赵子华张峥孙海波刘抒
Owner 山东龙旷金属制品有限公司
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