IN-SITU TESTING EQUIPMENT FOR TESTING MICROMECHANICAL PROPERTIES OF MATERIAL IN MULTI-LOAD AND MULTI-PHYSICAL FIELD COUPLED CONDITION

摘要

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 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, and 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. 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.

主权项

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.