Cohesive-soil strain-control-type I-type fracture toughness tester and testing method

A technology of strain control and fracture toughness, applied in the preparation of test samples, using stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as fracture, achieve unique structure, convenient cost, and improve test accuracy and stability effects

Inactive Publication Date: 2016-08-17
NANJING UNIV
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional three-point bending test for measuring the fracture toughness of metal, concrete and other materials is not suitable for the fracture toughness test

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
  • Cohesive-soil strain-control-type I-type fracture toughness tester and testing method
  • Cohesive-soil strain-control-type I-type fracture toughness tester and testing method
  • Cohesive-soil strain-control-type I-type fracture toughness tester and testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] like figure 1 and figure 2 As shown, a strain-controlled type I fracture toughness tester for cohesive soil of the present invention includes a platform for placing samples, a loading force system and a load-displacement measurement system for causing the samples to fracture, and a place for placing samples The platform includes a base 1, a stop bar 2 and a slide rail 3; the loading force system includes a motor 4, a telescopic connecting rod 5, a sensor 6 is connected to the front end of the connecting rod, and a push rod 7 is connected to the front of the sensor; the measuring system includes a sensor 6 and a The digital display 8 displays the thrust borne by the tested sample 9 through the digital display, and the base and the motor are installed on the mounting table. In the present invention, the expansion and contraction rate of the connecting rod can be controlled, and different expansion and contraction rates can be selected within a wide range.

[0024] In t...

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 discloses a cohesive soil strain control type I fracture toughness tester and a test method. The tester includes a mounting table, a motor is installed on the mounting table, and the motor is connected with a telescopic connecting rod. A sensor is connected to the front end of the connecting rod, and the sensor is connected to the push rod; a base is provided on the mounting table, a slide rail is provided on the base, a sample to be tested is provided on the slide rail, and a pair of stoppers are fixedly connected to the base. Rod, one side of the tested sample is connected with the blocking rod, and the other side is connected with the push rod, and the tested sample is provided with an initial crack. A strain-controlled Type I fracture toughness tester for cohesive soil of the present invention eliminates the influence of gravity by laying the test sample flat to perform the fracture test, and eliminates the influence of gravity by placing the test sample on the slide rail. The effect of friction.

Description

technical field [0001] The invention relates to a strain-controlled Type I fracture toughness tester and a test method for cohesive soil, belonging to the field of soil fracture testing in civil engineering and geological engineering. Background technique [0002] Changes in the stress state in the soil can lead to cracking of the soil. After the initial cracks are formed, the cracks will further expand and cause soil damage. Soil fracture toughness is a basic mechanical property index related to the crack propagation of soil, which reflects the ability of soil to resist the unstable expansion of cracks. According to the theory of fracture mechanics, when the stress intensity factor in the soil increases to a certain critical value, the cracks will be unstable and expand, resulting in the fracture and destruction of the soil. The critical or unstable expansion stress intensity factor is the fracture toughness. Because the tensile strength of soil is much lower than that of...

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
IPC IPC(8): G01N3/08G01N1/28
CPCG01N3/08G01N1/28G01N2203/0003G01N2203/0019G01N2203/005G01N2203/0062G01N2203/0067
Inventor 张云马维俊李泽华
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap