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

A Method for Asphalt Fatigue Performance Evaluation Based on Fracture Mechanics Theory

A technology of fracture mechanics theory and evaluation method, which is applied in the field of asphalt fatigue performance evaluation, which can solve the problems of lack of strong criteria for defining the critical point of fatigue life, and changes in the internal mesostructure of asphalt fatigue damage.

Active Publication Date: 2018-11-23
HARBIN INST OF TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that various asphalt fatigue evaluation indicators can not fully reflect the internal mesostructure changes of asphalt fatigue damage, and there is no strong criterion for the definition of the critical point of fatigue life, and then provide a method based on fracture mechanics theory Asphalt fatigue performance evaluation method

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 Method for Asphalt Fatigue Performance Evaluation Based on Fracture Mechanics Theory
  • A Method for Asphalt Fatigue Performance Evaluation Based on Fracture Mechanics Theory
  • A Method for Asphalt Fatigue Performance Evaluation Based on Fracture Mechanics Theory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The invention will be further described in detail below with reference to the drawings: this embodiment is implemented on the premise of the technical solution of the invention, and detailed implementation manners are given, but the protection scope of the invention is not limited to the following embodiments.

[0018] The method for evaluating fatigue performance of asphalt based on fracture mechanics theory involved in this embodiment includes the following steps:

[0019] Step 1. Use a dynamic shear rheometer to perform 8mm parallel plate stress scanning test and strain scanning test on asphalt, and then draw the stress-strain relationship curve with strain as the abscissa and stress as the ordinate, at the linear stage of the stress-strain curve Select the stress and strain values ​​(e.g. figure 1 , figure 2 Shown);

[0020] Step 2. Use the stress value or strain value selected in step 1 as the control load, and apply a sinusoidal load with the control load as the amplitu...

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

No PUM Login to View More

Abstract

The invention provides a pitch fatigue performance evaluation method based on a fracture mechanic theory. The method comprises the following steps: performing a fatigue test on pitch by use of a dynamic shear rheometer; calculating crack length data and accumulative dissipated energy data based on basic test parameters, and drawing an accumulative dissipated energy-crack length curve; analyzing to determine turning points of changing a crack development slow expansion period into an unstable dynamic expansion period under stress and strain control modes, namely a third turning point of the accumulative dissipated energy-crack length curve; taking loading times corresponding to a crack length at the turning point as pitch fatigue life, thereby finishing evaluation on pitch fatigue performance. The method is capable of evaluating the pitch fatigue performance under the stress and strain control modes, and analyzing and disclosing a pitch fatigue performance damage mechanism from internal structure changes, and has great significance in evaluation on the fatigue performance of a pitch material and pitch material production and application.

Description

Technical field [0001] The invention relates to an asphalt fatigue performance evaluation method based on fracture mechanics theory, and belongs to the technical field of asphalt fatigue performance evaluation methods. Background technique [0002] The fatigue damage evolution of asphalt is attributed to the generation and union of microscopic cracks, the formation and development of macroscopic cracks, until the material is completely destroyed. At present, researchers use changes in viscoelastic parameters such as modulus and dissipated energy to represent the development process of cracks. However, under different load modes, the appearance and development of cracks in asphalt are not clear. At the same time, a variety of fatigue determination indicators cannot fully reflect the internal microstructure changes of asphalt fatigue failure, and there is no strong criterion for defining the critical point of fatigue life. Therefore, the energy during the development of asphalt int...

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
CPCG01N3/32G01N2203/0073
Inventor 单丽岩田霜贺鸿森许亚男
Owner HARBIN INST OF TECH
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