CN203720018U - Clamp for testing room temperature compression stress and strain curve of porous material - Google Patents

Abstract

The utility model aims to provide a clamp for testing the room temperature compression stress and a strain curve of a porous material so as to effectively measure a metal porous material. The clamp is characterized by comprising a ribbed slab, a locating pin, a coaxial rod and a fastener, wherein one end of the locating pin is fixed on the ribbed slab by virtue of the fastener, the ribbed plate is fixed on a pressure head of a tester, a cylindrical through hole is formed in the locating pin in a penetrating way, the cross section of the coaxial rod is a round rod, and the coaxial rod is used for checking the coaxiality of the clamp. With the adoption of the clamp, the compression stresses and the strain curves of the metal porous materials in various sizes can be measured, and the accuracy of the compression mechanical property testing is improved.

Description

A fixture for testing the compressive stress and strain curves of porous materials at room temperature

technical field

The utility model belongs to the design field of material performance testing tools, and particularly provides a fixture for testing the room temperature compressive stress and strain curve of porous materials, which can measure the elastic modulus and compressive stress and strain curves of porous materials. the

Background technique

With the increasing application range of metal materials, porous metal materials are developing from simple functional materials to functional and structural integration, and the research on their mechanical properties has attracted more and more attention. In the study of mechanical properties of porous metal materials, compressive properties are one of the foundations of mechanical properties research. The compressive properties of porous metal materials are an important parameter in the application of porous metal materials. Therefore, it is important to be able to accurately measure the compressive stress-strain curve of porous metal materials. appears to be very important. the

There are mainly two methods for measuring the compressive stress-strain curve in metal materials. The first method is to attach strain gauges in the middle of the test piece. The strain gauges are components used to measure strains composed of sensitive grids. Paste it on the measuring point of the component. After the component is stressed, due to the strain of the measuring point, the sensitive grid is also deformed and its resistance changes. Then the resistance change is measured by a special instrument and converted into the strain of the measuring point. value. Since the porous material cannot firmly stick the strain gauge in the middle of the sample, the compressive stress-strain curve cannot be measured; the second method is the knife-edge method. Since the knife-edge size of the extensometer is fixed, the tested sample can only be smaller than the knife-edge size. This makes the test sample limited. the

Utility model content

Aiming at the deficiencies in the above-mentioned prior art, the utility model provides a fixture for testing the room-temperature compressive stress and strain curves of porous materials, so as to realize the effective measurement of porous metal materials. The fixture can realize the compression of porous metal materials of any size. The measurement of the stress-strain curve improves the accuracy of the compression mechanical performance test. the

The utility model specifically provides a fixture for testing the room temperature compressive stress and strain curve of a porous material, the fixture is composed of a rib plate 1, a positioning pin 2, a coaxial rod 3 and a fastener 4; wherein one end of the positioning pin 2 passes through The fastener 4 is fixed on the rib plate 1, the rib plate 1 is fixed on the indenter 5 of the testing machine, the inside of the positioning pin 2 has a cylindrical through hole 21 passing through it, and the coaxial rod 3 is a rod with a circular cross section. Used to check the coaxiality of the fixture. the

In the fixture for testing the room temperature compressive stress and strain curve of porous materials described in the utility model, the cross-sectional diameter of the coaxial rod 3 is 1 to 2 mm smaller than the diameter of the cylindrical through hole 21 . Before using the fixture, insert the coaxial rod 3 into the cylindrical through hole 21 inside the two symmetrical positioning pins 2. If the coaxial rod 3 falls, it means that the two positioning pins 2 are on the same axis. If the shaft rod 3 does not fall, it is necessary to adjust the position of the upper and lower positioning pins 2 until the coaxial rod 3 falls. the

In the jig for testing the room temperature compressive stress and strain curve of the porous material described in the utility model, the part of the rib plate 1 close to the positioning pin 2 has a semicircular groove for easy use. the

The fixture for testing the compressive stress and strain curve of porous materials at room temperature described in the utility model, the rib plate 1 is composed of a support plate 11 and a fixing device 12 connected to the support plate 11, and the support plate 11 is fixed on the indenter 5 of the testing machine by screws . the

The fixture for testing the room temperature compressive stress and strain curve of porous materials described in the utility model, the fixture is composed of a rib plate 1, a positioning pin 2, a coaxial rod 3 and a fastener 4;

Wherein the rib plate 1 is composed of a support plate 11 and a fixing device 12 connected to the support plate 11. The support plate 11 is fixed on the indenter 5 of the testing machine by screws. The fixing device 12 is a hollow cubic structure, and its two sides are respectively There are four symmetrical holes 13; one end of the positioning pin 2 is cylindrical, and the other end is a cubic structure, and the cubic structure is provided with a hole 22 that matches the hole 13 on the fixing device 12, and the positioning pin 2 has a hole that runs through it. The cylindrical through hole 21; the positioning pin 2 is fixed on the fixing device 12 through the fastener 4; the coaxial rod 3 is a rod with a circular cross section, which is used to check the coaxiality of the fixture. the

The utility model well solves the problem that the compressive stress and strain curve cannot be measured because the strain gauge cannot be pasted in the middle of the porous material sample when testing the room temperature compressive stress and strain curve test of the porous material. Make the test results more accurate and reliable. the

Description of drawings

Fig. 1 Structural schematic diagram of the fixture described in the utility model wherein 1, rib plate, 2, positioning pin, 3, coaxial rod, 4, fastener, 5, pressure head, 11, support plate, 12, fixing device;

Figure 2 Front view of rib plate;

Figure 3 Top view of the rib plate;

Figure 4 Perspective view of positioning pin. the

Detailed ways

Example 1

As shown in Figure 1, the fixture is composed of a rib plate 1, a positioning pin 2, a coaxial rod 3 and a fastener 4;

Wherein the rib plate 1 is made up of a support plate 11 and a fixture 12 connected to the support plate 11, the support plate 11 is fixed on the indenter 5 of the electronic universal testing machine by screws, the fixture 12 is a hollow cube structure, and its two sides There are four symmetrical holes 13 respectively; one end of the positioning pin 2 is cylindrical, and the other end is a cubic structure, and the cubic structure is provided with a hole 22 that matches the hole 13 on the fixing device 12, and the positioning pin 2 has a penetrating hole inside. The cylindrical through hole 21 therein; the positioning pin 2 is fixed on the fixing device 12 through the fastener 4; the coaxial rod 3 is a rod with a circular cross section, which is used for checking the coaxiality of the fixture. the

First fix the rib plate 1 on the indenter of the electronic universal testing machine with screws, and use the coaxial rod 3 to adjust the coaxiality of the device. After adjustment, remove the coaxial rod and fix the extensometer at the position of the positioning pin 2 on, and experiment. the

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model. the

Claims (5)

1. A fixture for testing the compressive stress and strain curves of porous materials at room temperature, characterized in that: the fixture is composed of ribs (1), positioning pins (2), coaxial rods (3) and fasteners (4) ; One end of the positioning pin (2) is fixed on the rib plate (1) through the fastener (4), the rib plate (1) is fixed on the indenter (5) of the testing machine, and the positioning pin (2) has a penetrating Wherein the cylindrical through hole (21), the coaxial rod (3) is a rod with a circular cross section, and is used for testing the coaxiality of the fixture. 2. The fixture for testing the room temperature compressive stress and strain curves of porous materials according to claim 1, characterized in that: the cross-sectional diameter of the coaxial rod (3) is 1-2 mm smaller than the diameter of the cylindrical through hole (21). 3. The fixture for testing the room temperature compressive stress and strain curves of porous materials according to claim 1 or 2, characterized in that: the part of the rib (1) close to the positioning pin (2) has a semicircular groove. 4. The fixture for testing the room temperature compressive stress and strain curves of porous materials according to claim 1 or 2, characterized in that: the rib plate (1) is composed of a support plate (11) and a fixing device (12) connected to the support plate (11) ), the support plate (11) is fixed on the indenter (5) of the testing machine by screws. 5. The fixture for testing the compressive stress and strain curves of porous materials at room temperature according to claim 1 or 2, characterized in that: the fixture is composed of ribs (1), positioning pins (2), coaxial rods (3) and tight The firmware (4) consists of; The rib plate (1) is composed of a support plate (11) and a fixing device (12) connected to the support plate (11), the support plate (11) is fixed on the pressure head (5) of the testing machine by screws, and the fixing device ( 12) is a hollow cube structure, and four symmetrical holes (13) are respectively provided on its two sides; one end of the positioning pin (2) is cylindrical, and the other end is a cube structure, and the cube structure is provided with a fixing device ( The hole (13) on 12) matches the hole (22), and the positioning pin (2) has a cylindrical through hole (21) passing through it inside; the positioning pin (2) is fixed on the fixing device through the fastener (4) (12) above; the coaxial rod (3) is a rod with a circular cross section, which is used to test the coaxiality of the fixture.