In-situ testing equipment for testing micromechanical properties of material in multi-load and multi-physical field coupled condition

Patent metadata

Field	Value
Publication number	US-10012576-B2
Application number	US-201415024119-A
Country	US
Kind code	B2
Filing date	Mar 3, 2014
Priority date	Sep 26, 2013
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

An in-situ testing equipment for testing micromechanical properties of a material in a multi-load and multi-physical field coupled condition is disclosed. The equipment comprises a frame supporting module, a tension/compression-low cycle fatigue module, a torsioning module ( 21 ), a three-point bending module ( 6 ), an impressing module ( 33 ), a thermal field and magnetic field application module ( 34 ), an in-situ observation module ( 32 ) and a clamp body module ( 22 ). The testing equipment is capable of realizing applications of five different types of loads including tension/compression, low cycle fatigue, torsion, bending and impressing, performing an intensive study on micromechanical properties of the material in the multi-load and multi-physical field coupled condition by using built-in electric, thermal and magnetic application modules and the in-situ observation module, and acquiring relations between deformation behavior, mechanism of damage, performance weakening of the material, applied loads and material properties.

First claim

What is claimed is:

1. An in-situ testing equipment configured for testing micromechanical properties of a material in a multi-load and multi-physical field coupled condition, comprising a frame supporting module, a tension/compression-low cycle fatigue module, a torsioning module ( 21 ), a three-point bending module ( 6 ), an impressing module ( 33 ), a thermal field and magnetic field application module ( 34 ), an in-situ observation module ( 32 ) and a clamp body module ( 22 ), wherein:
the frame supporting module provides a structural support for the whole testing equipment;
the tension/compression-low cycle fatigue module is arranged at upper and lower ends of the testing equipment;
the torsioning module ( 21 ) is directly arranged at a front end of the tension/compression-low cycle fatigue module;
the three-point bending module ( 6 ), the impressing module ( 33 ) and the thermal field and magnetic field application module ( 34 ) are disposed on a support post at one side of the whole testing equipment through a common replacing component;
the in-situ observation module is disposed on another support post at the other side of the testing equipment;
the clamp body module is connected to a front segment of the torsioning module, so as to clamp a test piece;
an overall structure of the testing equipment is configured in a vertically symmetrical arrangement achieved by using four support posts;
two identical servo hydraulic cylinders ( 10 ) and two torsioning modules ( 21 ) are located at the upper and the lower ends of the testing equipment respectively and are used to perform a symmetrical tension/compression test and a symmetrical torsion test on the test piece ( 23 ) positioned centrally, to ensure that the geometrical center of the test piece ( 23 ) is maintained stationary during tension/compression and torsion tests, and to facilitate an in-situ dynamic observation on performances including deformation and damage of the material during the test;
the testing equipment is capable of realizing applications of five different types of loads including tension/compression, low cycle fatigue, torsion, bending and impressing, to perform an intensive study on micromechanical properties of the material in the multi-load and multi-physical field coupled condition by using built-in electric, thermal and magnetic application modules and the in-situ observation module, and to acquire relations between deformation behavior, mechanism of damage, performance weakening of the material, applied loads and material properties;
the tension/compression-low cycle fatigue module comprises the servo hydraulic cylinders ( 10 ) and a hydraulic cylinder fixing sleeve ( 13 ); by means of a mounting flange, the servo hydraulic cylinder ( 10 ) and the hydraulic cylinder fixing sleeve ( 13 ) mate with each other with a tolerance between an axle of the servo hydraulic cylinder and a hole of the hydraulic cylinder fixing sleeve, so as to ensure mounting accuracy, and are fastened by a second screw ( 11 ) and a second resilient washer ( 12 ); the hydraulic cylinder fixing sleeve ( 13 ) is rigidly fixed to the upper and lower support plates ( 7 , 103 ) through a third screw ( 14 ) and a third resilient washer ( 15 ); the tension/compression-low cycle fatigue module utilizes two high-accuracy hydraulic cylinders ( 10 ) as a power source and accurately controls a displacement in the tension/compression low cycle fatigue process through controlling an amount of oil flowing into the servo hydraulic cylinders ( 10 ) and flow direction of the oil through a multi-channel servo controller; and
the torsioning module ( 21 ) comprises a torsion servo motor ( 44 ), a worm gear reducer and a ball spline ( 47 ); an output shaft of the torsion servo motor ( 44 ) is connected with a worm shaft ( 40 ) through a first key ( 42 ); a worm ( 41 ) and the worm shaft ( 40 ) are connected with each other through a key; a second sleeve ( 43 ) is used to maintain an axial position of an outer ring of a rolling bearing; the worm shaft ( 40 ) is supported within a mounting hole of a worm housing ( 35 ) through a first rolling bearing ( 38 ); an outer spline housing of the ball spline ( 47 ) is supported within the mounting hole of the worm housing ( 35 ) through a second sleeve ( 49 ) and a second rolling bearing ( 46 ); a worm wheel ( 50 ) is connected to the outer spline housing of the ball spline ( 47 ) through a second key ( 52 ); one end of the ball spline ( 47 ) is connected with a rod of the servo hydraulic cylinder ( 10 ) through a coupling sleeve ( 8 ) and an expansion sleeve ( 9 ), and the other end thereof is connected to the clamp body module ( 22 ) through an expansion sleeve; the torsioning module ( 21 ) utilizes the servo motor as a power source, and a torsion angle is output to a ball spline shaft connected with the rod of the hydraulic cylinder after reduction in speed via a worm gear having a large one-stage reduction gear ratio, so as to drive the rod and the clamp body module located at a front end to rotate as a whole.

2. The in-situ testing equipment according to claim 1 , wherein
the three-point bending module ( 6 ) comprises a bending servo motor ( 54 ), a transmission assembly comprising a ball screw ( 60 ) and a lead screw nut ( 61 ), a pressing head ( 64 ), and first and second guide rail-slider assemblies ( 71 , 72 ); the bending servo motor ( 54 ) is fixedly connected to a motor flange ( 57 ) by a one-stage reducer ( 55 ); power is transmitted to the ball screw ( 60 ) via a coupling ( 58 ) from an output shaft of the reducer ( 55 ) and converted by the lead screw nut ( 61 ) into a linear movement of the pressing head ( 64 ) for bending; the first guide rail-slider assembly ( 71 ) is connected with a bending bottom plate ( 70 ), such that the three-point bending module ( 6 ) floats as a whole relative to a support plate ( 74 ) for the bending bottom plate, so as to achieve an internal force type bending; a nut coupling member ( 62 ) is guided by the second guide rail-slider assembly ( 72 ) to ensure linearity of displacement of the pressing head;
the impressing module ( 33 ) comprises an impression servo motor ( 75 ), a leading screw-nut assembly ( 89 ), piezoelectric ceramic ( 93 ), a flexible hinge ( 81 ), a force sensor ( 84 ), a capacitive displacement sensor ( 83 ) and a diamond impressing head ( 87 ); the impression servo motor ( 75 ) is mounted on a first bottom plate ( 77 ) through a flange ( 76 ); a second bottom plate ( 78 ) is mounted on the first bottom plate ( 77 ) through a LM guide rail-slider ( 96 ) for direction guidance; a support ( 79 ) for the displacement sensor is mounted via a manual translation platform ( 95 ) on a support ( 80 ) for the manual translation platform; the support ( 80 ) for the manual translation platform is fixed to the second bottom plate ( 78 ); the manual translation platform ( 95 ) is used to adjust an initial distance between a probe of the capacitive displacement sensor ( 83 ) and a reflective plate ( 85 ), and the probe of the displacement sensor is fixedly clamped by an adjusting screw ( 82 ); the capacitive displacement sensor ( 83 ) is placed within a recess located at a front end of the support ( 79 ) for the displacement sensor; the adjusting screw ( 82 ) is used to fixedly clamp the capacitive displacement sensor ( 83 ); the second bottom plate ( 78 ) is fixedly connected with the manual translation platform ( 95 ); the diamond impressing head ( 87 ) is mounted at one end of the force sensor ( 84 ) through a sleeve ( 86 ) for the impressing head, the other end of the force sensor is connected to the flexible hinge ( 81 ) through an external mounting bolt; a fastening screw ( 92 ) is used to fix the diamond impressing head ( 87 ); the piezoelectric ceramic ( 93 ) is mounted within a recess of the flexible hinge ( 81 ) and pre-fastened by a pre-pressing pad ( 94 );

Assignees

• Univ Jilin

Inventors

• Zhao Hongwei
• Ren Luquan
• Li Jianping
• Huang Hu
• Zhang Panfeng
• Hu Xiaoli
• Cheng Hongbing
• Fang Daining
• Ma Zhichao
• Zhuang Qingwei
• Gao Jing
• Dong Xiaolong
• Tang Kehong
• Zhang Fu
• Zou Qing
• Zhu Yuxiang
• Dong Jingshi
• Fan Zunqiang
• Hu Yong
• Shang Tao

Classifications

• G01N3/06 Primary

  Special adaptations of indicating or recording means · CPC title

• G01N3/22

  by applying steady torsional forces (G01N3/26, G01N3/28 take precedence) · CPC title

• G01N3/20

  by applying steady bending forces (G01N3/26, G01N3/28 take precedence) · CPC title

• G01N3/26

  Investigating twisting or coiling properties · CPC title

• G01N3/04

  Chucks · CPC title