Rock high-stress high-temperature micro-nano indentation test system

Patent metadata

Field	Value
Publication number	US-11415498-B2
Application number	US-202017070946-A
Country	US
Kind code	B2
Filing date	Oct 15, 2020
Priority date	Oct 23, 2019
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

The present disclosure discloses a rock high-stress high-temperature micro-nano indentation test system, comprising: an X, Y, Z three-direction macroscopic adjustment module, an indentation precision loading module, an indentation test module and an indentation data processing module. The rock high-stress high-temperature micro-nano indentation test system further comprise a two-dimensional horizontal stress loading device, a temperature control device and a vacuum device 13. The rock high-stress high-temperature micro-nano indentation test system provided by the present disclosure has distinctive features of modularity and structuralization, and its test results have high accuracy. The rock high-stress high-temperature micro-nano indentation test system is easy to operate, and provides a theoretical and technical system support for testing the mechanical characteristics of the rock under the high-stress and high-temperature environment in the deep region.

First claim

The invention claimed is:

1. A rock high-stress high-temperature micro-nano indentation test system, comprising:
an X, Y, Z three-direction macroscopic adjustment module, an indentation precision loading module, an indentation test module and an indentation data processing module;
wherein the rock high-stress high-temperature micro-nano indentation test system further comprises a two-dimensional horizontal stress loading device, a temperature control device and a vacuum device;
and wherein the two-dimensional horizontal stress loading device comprises a horizontal loading frame, a first micro high-pressure oil cylinder, a second micro high-pressure oil cylinder, a first pressing plate, a second pressing plate, a first micro-flow loading pump and a second micro-flow loading pump;
the horizontal loading frame is provided with a groove for placing a rock sample;
a cylinder body of the first micro high-pressure oil cylinder is fixed to a side of the horizontal loading frame, and a piston rod is extended out of a side end of the horizontal loading frame and then is fixedly connected with the first pressing plate;
a cylinder body of the second micro high-pressure oil cylinder is fixed to another side of the horizontal loading frame, and a piston rod is extended out of the side end of the horizontal loading frame and then is fixedly connected with the second pressing plate;
a force applying direction of the first micro high-pressure oil cylinder is coplanar and perpendicular to a force applying direction of the second micro high-pressure oil cylinder;
the first micro-flow loading pump is connected with the first micro high-pressure oil cylinder, and the second micro-flow loading pump is connected with the second micro high-pressure oil cylinder;
the temperature control device comprises a plurality of first heating components, a plurality of second heating components, a thermocouple sensor and a temperature controller;
a plurality of groove strips are arranged inside the groove of the horizontal loading frame, and the first heating components are arranged inside a corresponding groove strip;
a micro-nano indenter of the indentation precision loading module is arranged above the rock sample, and a plurality of the second heating components are arranged on periphery of the micro-nano indenter;
the thermocouple sensor is arranged on a top surface of the rock sample, and the temperature controller is electrically connected with the thermocouple sensor, the first heating components and the second heating components;
the horizontal loading frame, the first pressing plate, the second pressing plate, the rock sample, the thermocouple sensor, the first heating components and the second heating components are arranged inside the vacuum device;
the horizontal loading frame is of a high-strength hollow square-shaped structure, and the groove of the horizontal loading frame is rectangular;
the cylinder body of the first micro high-pressure oil cylinder and the cylinder body of the second micro high-pressure oil cylinder are fixedly connected with the horizontal loading frame through flanges;
the rock sample is arranged in a rectangular structure, and a dimension of the rock sample is 3˜10 mm in length, 3˜10 mm in width and 3˜10 mm in height; and
the rock sample abuts against a corner position of the groove.

2. The rock high-stress high-temperature micro-nano indentation test system of claim 1 , further comprising a high-precision closed-loop servo controller electrically connected with the first micro-flow loading pump and the second micro-flow loading pump.

3. The rock high-stress high-temperature micro-nano indentation test system of claim 2 , wherein the first micro-flow loading pump and the second micro-flow loading pump are micro-flow high-precision servo loading pumps;
the first micro high-pressure oil cylinder is connected with the first micro-flow loading pump through a micro hydraulic pipeline; and
the second micro high-pressure oil cylinder is connected with the second micro-flow loading pump through a micro hydraulic pipeline.

4. The rock high-stress high-temperature micro-nano indentation test system of claim 1 , wherein a bottom surface of the groove of the horizontal loading frame is provided with four parallel groove strips.

5. The rock high-stress high-temperature micro-nano indentation test system of claim 1 , wherein the first heating components and the second heating components are mica electric heating sheets.

6. The rock high-stress high-temperature micro-nano indentation test system of claim 1 , wherein outside surfaces of the horizontal loading frame are wrapped with an aerogel nano-solid heat preservation layer, and the aerogel nano-solid heat preservation layer is made of silicon oxide.

7. The rock high-stress high-temperature micro-nano indentation test system of claim 1 , wherein the temperature controller is a proportional differential integral temperature controller.

8. The rock high-stress high-temperature micro-nano indentation test system of claim 1 , wherein a polishing precision range of a surface of the rock sample is controlled to be 10˜20 nm.

Assignees

• Inst Rock & Soil Mech Cas

Inventors

• Hu Dawei
• Song Jinliang
• Zhang Guoping
• Zhou Hui
• Shao Jianfu
• Zhang Chuanqing
• Yang Fanjie
• Lu Jingjing
• Zhu Yong
• Gao Yang
• Zhang Fan

Classifications

• G01N2203/0254

  Biaxial, the forces being applied along two normal axes of the specimen · CPC title

• G01N2203/0286

  Miniature specimen; Testing on microregions of a specimen · CPC title

• G01N3/42 Primary

  by performing impressions under a steady load by indentors, e.g. sphere, pyramid (G01N3/54 takes precedence) · CPC title

• G01N2203/0075

  Strain-stress relations or elastic constants · CPC title

• G01N3/18 Primary

  Performing tests at high or low temperatures · CPC title