Dynamic friction experimental device and method for testing dynamic mechanical property of material

Patent metadata

Field	Value
Publication number	US-12411066-B2
Application number	US-202318143625-A
Country	US
Kind code	B2
Filing date	May 5, 2023
Priority date	May 6, 2022
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A dynamic friction experimental device includes a base, an incident bar, an axial compression device, and a torque loading device. The base is provided with a displacement-constrain structure, and the incident bar includes a first incident section and a second incident section. The first incident section is arranged adjacent to the displacement-constrain structure, and the second incident section is connected to the first incident section. At a joint of the first incident section and the second incident section, a projection of a cross section of the first incident section is positioned in a cross section of the second incident section along an axial direction of the second incident section. When the dynamic mechanical property of a specimen is tested, the axial compression device is configured to apply pressure to the second incident section, and the torque loading device is configured to apply torque to the second incident section.

First claim

What is claimed is:

1. A dynamic friction experimental device, comprising:
a base, wherein the base is provided with a displacement-constrain structure, and the displacement-constrain structure is abutted against a first end face of a specimen when a dynamic mechanical property of the specimen is tested;
an incident bar, wherein the incident bar and the displacement-constrain structure are positioned on a same side of the base, and the incident bar comprises at least two sections, wherein the at least two sections are coaxially arranged, a first incident section of the at least two sections is arranged adjacent to the displacement-constrain structure, and a second incident section of the at least two sections is connected to the first incident section; at a joint of the first incident section and the second incident section, a cross-sectional area of the first incident section is less than a cross-sectional area of the second incident section, and a projection of a cross section of the first incident section is positioned in a cross section of the second incident section along an axial direction of the second incident section; when the dynamic mechanical property of the specimen is tested, an end of the first incident section is abutted against a second end face of the specimen, wherein the end of the first incident section faces the displacement-constrain structure;
an axial compression device, wherein the axial compression device is connected to an end of the second incident section, wherein the end of the second incident section is far away from the first incident section, and the axial compression device is configured to apply pressure to the second incident section;
a torque loading device, wherein the torque loading device is connected to the second incident section, and the torque loading device is configured to apply torque to the second incident section;
an energy storage bar, wherein a first end of the energy storage bar is fixedly connected to an end of the incident bar, wherein the end of the incident bar is far away from the specimen, and a second end of the energy storage bar is abutted against and rotatably connected to the axial compression device; and
a clamping device, wherein the clamping device is fixedly arranged on the base and is positioned between the torque loading device and the incident bar, and the energy storage bar penetrates through the clamping device; the energy storage bar is clamped by the clamping device, so that the energy storage bar is configured to stores the torque applied by the torque loading device; and when torque loading reaches a torque set value, a clamping of the clamping device is unlocked to release the torque stored in the energy storage bar.

2. The dynamic friction experimental device according to claim 1 , wherein the torque loading device comprises racks and gears, wherein the racks and the gears are engaged with each other, the racks are fixed on the base, and the gears are fixedly connected to the second incident section.

3. The dynamic friction experimental device according to claim 2 , wherein the experimental device further comprises:
the energy storage bar, wherein the first end of the energy storage bar is fixedly connected to the second incident section, the second end of the energy storage bar is abutted against the axial compression device and is rotatably connected to the axial compression device, and the gears are sleeved on the energy storage bar; and
the clamping device, wherein the clamping device is positioned between the torque loading device and the second incident section, and the clamping device comprises a clamping servo-controlled hydraulic cylinder, a fixing plate, a first frictional clamp and a second frictional clamp, wherein the first frictional clamp and the second frictional clamp are arranged at intervals oppositely; the clamping servo-controlled hydraulic cylinder and the first frictional clamp are fixedly arranged on the base, and the second frictional clamp is connected to the base in a sliding manner; a side of the first frictional clamp and a side of the second frictional clamp are connected to the fixing plate, wherein the side of the first frictional clamp and the side of the second frictional clamp are far away from the base, and the energy storage bar penetrates between the first frictional clamp and the second frictional clamp; the clamping servo-controlled hydraulic cylinder is connected to the second frictional clamp, wherein when the second frictional clamp moves to the first frictional clamp through the clamping servo-controlled hydraulic cylinder until the first frictional clamp and the second frictional clamp are in close contact with the energy storage bar, the first frictional clamp and the second frictional clamp are configured to clamp the energy storage bar; and when the fixing plate is pulled apart, the first frictional clamp and the second frictional clamp are configured to release a clamping limitation on the energy storage bar.

4. The dynamic friction experimental device according to claim 1 , wherein the specimen is of a circular-ring sheet structure, and the first incident section is of a first circular-ring tubular structure; wherein an inner diameter of the first incident section is less than an outer diameter of the specimen, and an outer diameter of the first incident section is greater than an inner diameter of the specimen.

5. The dynamic friction experimental device according to claim 4 , wherein the second incident section is of a second circular-ring tubular structure, and a wall thickness of the second incident section is greater than a wall thickness of the first incident section.

6. The dynamic friction experimental device according to claim 5 , wherein the outer diameter of the first incident section is less than an outer diameter of the second incident section, and the inner diameter of the first incident section is same as an inner diameter of the second incident section;
or,
the outer diameter of the first incident section is same as the outer diameter of the second incident section, and the inner diameter of the first incident section is greater than the inner diameter of the second incident section.

7. The dynamic friction experimental device according to claim 6 , wherein the torque has a reflection coefficient R at the joint of the first incident section and the second incident section, R=1−T, wherein T is a transmission coefficient of the torque at the joint of the first incident section and the second incident section,

T
=

2
⁢

(

A
1

⁢

ρ
1

⁢

I
1

A
2

⁢

ρ
2

⁢

I
2

)

Assignees

• Univ Tianjin

Inventors

• Xia Kaiwen
• Xu Ying
• Wu Bangbiao
• Yao Wei
• Dong Peng

Classifications

• G01N3/04

  Chucks · CPC title

• G01N2203/0019

  Compressive · CPC title

• G01N3/08

  by applying steady tensile or compressive forces (G01N3/28 takes precedence) · CPC title

• G01N3/26

  Investigating twisting or coiling properties · CPC title

• G01N3/02

  Details · CPC title