Pitch fatigue performance evaluation method based on fracture mechanic theory

A technology of fracture mechanics theory and evaluation method, which is applied in the evaluation field of asphalt fatigue performance, which can solve the problems such as the lack of a strong criterion for the definition of the critical point of fatigue life and the change of the internal mesostructure of asphalt fatigue damage.

Active Publication Date: 2016-08-24
HARBIN INST OF TECH
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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

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  • Pitch fatigue performance evaluation method based on fracture mechanic theory
  • Pitch fatigue performance evaluation method based on fracture mechanic theory
  • Pitch fatigue performance evaluation method based on fracture mechanic theory

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Embodiment Construction

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

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

[0019] Step 1: Carry out 8mm parallel plate stress sweep test and strain sweep test on asphalt with dynamic shear rheometer, then draw stress-strain relationship curve with strain as abscissa and stress as ordinate, in the linear stage of stress-strain curve Select stress and strain values ​​(such as figure 1 , figure 2 shown);

[0020] Step 2. Using the stress value or strain value selected in Step 1 as the control load, apply a sinusoidal load with the control load as the amp...

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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 evaluation method for asphalt fatigue performance based on fracture mechanics theory, and belongs to the technical field of evaluation methods for asphalt fatigue performance. Background technique [0002] The fatigue damage evolution of asphalt is attributed to the generation and combination of micro cracks, the formation and development of macro cracks, until the material is completely destroyed. At present, researchers use the change of viscoelastic parameters such as modulus and dissipated energy to represent the crack development process. However, under different loading modes, the occurrence and development of internal cracks in asphalt are not clear. At the same time, various fatigue judgment indicators cannot fully reflect the changes in the internal mesostructure of asphalt fatigue damage, and there is no strong criterion for the definition of the critical point of fatigue life. Therefore, based on the theory of fra...

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Application Information

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Patent Type & Authority Applications(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
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