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A calculation method for obtaining stress intensity factor in the process of road hydrodynamic damage

A technique of stress intensity factor, calculation method, applied in the direction of strength characteristics, instruments, measuring devices, etc.

Active Publication Date: 2022-07-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the phenomenon of cracks and cracks caused by road dynamic water damage, there is no evaluation to reflect the degree of road dynamic water damage by the size of the stress intensity factor

Method used

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  • A calculation method for obtaining stress intensity factor in the process of road hydrodynamic damage
  • A calculation method for obtaining stress intensity factor in the process of road hydrodynamic damage
  • A calculation method for obtaining stress intensity factor in the process of road hydrodynamic damage

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Embodiment 1

[0049] This embodiment is further described in conjunction with the research on hydrodynamic damage of a certain road section, including the following steps:

[0050] 1. In the process of pavement paving, select the structural layer where the sensor needs to be embedded, and process the position of the embedded sensor;

[0051] 2. The silicon piezoresistive pressure sensor is used, embedded in the asphalt pavement structure layer, and the sensor wire is drawn out to protect the wire;

[0052] 3. After the asphalt pavement is formed, sprinkle water and soak it in, so that the pavement maintains a water film of 5mm-10mm, and maintains it for 1 hour;

[0053] 3.1. Use wooden wedges to enclose the tested road section where the pressure sensor is buried;

[0054] 3.2. Pour clear water on the tested road surface until a 5-10mm water film appears on the road surface;

[0055] 3.3. The water on the road surface continues to penetrate into the interior of the road structure, and the ...

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Abstract

The invention discloses a calculation method for obtaining a stress intensity factor in the process of road hydrodynamic damage. The steps are as follows: pre-embedding a pressure sensor in the process of pavement paving; watering and infiltrating the test road section, keeping 5mm to 10mm of water Membrane; open the test section, record the hydrodynamic pressure when the vehicle passes, and record the maximum hydrodynamic pressure peak as p1; sample the drilling core of the pavement layer buried with the pressure sensor, and cut it longitudinally to measure the dynamic pressure around the sensor. The main crack length of water damage is 2a; a two-dimensional theoretical model of crack cracking caused by dynamic water damage is established, and the stress intensity factor K at the crack tip is deduced I Formula; Substitute the measured maximum hydrodynamic pressure peak value and crack length value to calculate the stress intensity factor in the process of road hydrodynamic damage. The invention can calculate the stress intensity factor when the road material is damaged, and can predict the development trend of the dynamic water damage by comparing the stress intensity factor with the crack resistance toughness of the road material.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a calculation method for obtaining a stress intensity factor in the process of road hydrodynamic damage. Background technique [0002] For hydrodynamic damage in road engineering, many existing technologies mainly focus on measuring or calculating the magnitude of hydrodynamic pressure to evaluate the severity of hydrodynamic damage, but do not link the magnitude of hydrodynamic pressure with the material damage index to make technological breakthrough and damage assessment. The stress intensity factor K is an important basic concept in linear elastic fracture mechanics. It is related to the geometry of cracks and components, as well as the magnitude and mode of action of external forces, but has nothing to do with the choice of coordinates, that is, it does not involve stress and displacement near the crack tip. distribution. Therefore, the size of K can measure the size of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38G01N3/00G01N3/06
CPCG01N33/383G01N3/00G01N3/06G01N2203/0019G01N2203/0218G01N2203/0676G01N2203/0682
Inventor 张旺轩蔡学滔朱吉鹏
Owner NANJING UNIV OF SCI & TECH