CN110926933A

CN110926933A - Simple material dynamic mechanical property testing device

Info

Publication number: CN110926933A
Application number: CN201911202391.4A
Authority: CN
Inventors: 曾广胜; 江太君; 陈一; 孟聪; 胡灿; 尹琛; 刘水长
Original assignee: Hunan University of Technology
Current assignee: Hunan University of Technology
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-03-27

Abstract

The invention relates to the technical field of material mechanical property testing, and discloses a simple material dynamic mechanical property testing device which comprises a supporting table for placing a sample and a cam mechanism arranged above the supporting table, wherein a pressing wheel and a pressing rod which are connected with each other are arranged between the cam mechanism and the sample, the pressing rod is abutted against the surface of the sample, a guide mechanism is arranged on the periphery of the pressing rod to assist the pressing rod to move along the vertical direction, a spring is arranged between the lower end surface of the pressing wheel and the guide mechanism, the cam mechanism comprises a driving motor, a driving rod and a cam arranged on the driving rod, the cam is driven to rotate by the driving motor along with the driving rod, and. Introducing a plurality of groups of cam mechanisms, applying periodic force to the material sample by virtue of periodic rotation of the cam, obtaining the response condition of the material to the periodic force through a force sensor, and obtaining the dynamic mechanical property of the material from the surface. The device is simple to operate, durable and accurate in result, and can be widely used for developing and researching new materials of universities and enterprises.

Description

Simple material dynamic mechanical property testing device

Technical Field

The invention relates to the technical field of material mechanical property testing, in particular to a simple device for testing the dynamic mechanical property of a material.

Background

The dynamic mechanical property of the material is an important component of the physical and mechanical properties of the material, and reflects the transient response of the material under the action of an alternating force field. The dynamic mechanical property of the material can simulate the strength, damage and yield of the material and products under the actual alternating force field working condition, and can reflect the characteristic response of the material microstructure under the action of the periodic stress field, so that the material microstructure can be used for distinguishing and analyzing the characteristics of the internal microstructure of the molecular material. Therefore, the dynamic mechanical property of the material has very important significance for understanding the material, particularly the macroscopic mechanical failure mode of the material and the partial molecular structure in the high molecular material.

The instrument for measuring the dynamic mechanical property of the material mainly comprises a dynamic mechanical analyzer, applies periodic vibration external load to a sample by an electromagnetic or mechanical method, and calculates a modulus curve spectrum of the material to represent the dynamic mechanical property of the material by testing the transient stress response of the material. The instrument has complex structure and high precision, but has high requirement on the sample and high price, and can not be borne by common enterprises and scientific research units.

Disclosure of Invention

The invention solves the technical problem of overcoming the defects of the prior art and provides a simple material dynamic mechanical property testing device which is convenient to manufacture and operate and can quickly acquire the material characteristics.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a simple and easy material dynamic mechanical properties testing arrangement, including a supporting bench that is used for placing the sample, locate the cam mechanism of a supporting bench top, be provided with interconnect's pinch roller and depression bar between cam mechanism and the sample, depression bar and sample surface butt, the guide mechanism is installed to the depression bar periphery and is assisted the depression bar and move along vertical direction, set up the spring under the pinch roller between terminal surface and the guide mechanism, cam mechanism includes driving motor, the actuating lever and install the cam on the actuating lever, the actuating lever is followed by driving motor and is driven rotatoryly to the cam, the pinch roller contacts with rotatory cam all the time, the depression bar sets up pressure sensor with the.

Further, a plurality of cams of different specifications are mounted on the driving rod.

Further, the plurality of cams are arranged at equal intervals.

Still further, a plurality of cams are ordered on the drive rod from smaller to larger according to specifications.

Furthermore, the supporting platform comprises a slide rail, a supporting seat capable of moving along the slide rail and a supporting beam arranged above the supporting seat, and the sample is placed on the supporting beam.

Further, the support beam can be slid on the support base to determine the position of the support beam according to the size of the sample.

Compared with the prior art, the invention has the following beneficial effects:

introducing a plurality of groups of cam mechanisms, applying periodic force to the material sample by virtue of periodic rotation of the cam, obtaining the response condition of the material to the periodic force through a force sensor, and obtaining the dynamic mechanical property of the material from the surface. The device is simple to operate, durable and accurate in result, and can be widely used for developing and researching new materials of universities and enterprises.

Drawings

FIG. 1 is a schematic diagram of a simple dynamic mechanical property testing device for materials (not including a guide block and a spring) in example 1;

FIG. 2 is a partial view of the springs positioned between the puck and the guide blocks of FIG. 1.

Detailed Description

The present invention will be further described with reference to the following detailed description, wherein the drawings are provided for illustrative purposes only and are not intended to be limiting; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in figure 1, a simple material dynamic mechanical property testing device comprises a supporting table 1 for placing a sample A and a cam mechanism 2 arranged above the supporting table, wherein a pressing wheel 3 and a pressing rod 4 which are connected with each other are arranged between the cam mechanism 2 and the sample A, the pressing rod 4 is abutted against the surface of the sample, as shown in figure 2, a guide mechanism 5 is arranged on the periphery of the pressing rod 4 to assist the pressing rod 4 to move along the vertical direction, a spring 6 is arranged between the lower end face of the pressing wheel 3 and the guide mechanism 5, the cam mechanism 2 comprises a driving motor 21, a driving rod 22 and a cam 23 arranged on the driving rod, rolling bearings 24 are arranged at two ends of the driving rod, the cam 23 is driven to rotate by the driving motor 21 along with the driving rod 22, in the rotating process of the cam 23, due to the existence of the spring 24, the pressing wheel 3 can always contact with the cam 23, so as to measure the pressed condition of the sample in real time.

In order to facilitate the one-time multiple pressure test of the sample, a plurality of cams 23 with different specifications can be arranged on the driving rod 22, and in addition, the plurality of cams are arranged on the driving rod at equal intervals from small to large according to the specification, and the regular sequencing of the cams can provide favorable conditions for the orderly test of the mechanical property of the sample.

The supporting table 1 comprises a slide rail 11, a supporting seat 12 capable of moving along the slide rail, and at least two supporting beams 13 arranged above the supporting seat, wherein a sample A is placed on the supporting beams 13 to ensure that the tested part of the sample is in a suspension testing state, and the testing accuracy is ensured. The support base 12 can be horizontally moved and fixed on the slide rail 11 according to the cam specification position of the test sample without moving the test sample.

In addition, the supporting beam 13 and the supporting base 12 are independent, and the supporting beam can be provided with adhesive on two end faces thereof, so that the supporting beam can slide on the supporting base in the opposite direction according to the size of the sample to adjust the distance to determine the position, and the adhesive on the two ends thereof can form a good bonding and fixing effect with the supporting base and the sample. Of course, the upper surface of the supporting seat can also be provided with a chute with a certain rule, and the end part of the supporting beam is provided with a structure matched with the chute, so that the supporting beam slides along the supporting seat to change the distance between the two supporting beams to adapt to the size of the sample.

The testing device of the embodiment drives the pressure rod to press down periodically through the contact of the cam and the pressing wheel and the rotation of the cam, the displacement change of the pressure rod forms a sinusoidal motion after the cam rotates for a circle, and the rotation period of the cam is the period of the alternating load on the material.

The maximum displacement generated by the cam driving press rod can be regarded as the peak value corresponding to the periodic strain borne by the material, the peak values corresponding to different cams are different, and the cams with different specifications can be switched randomly for testing.

The test flow of the test device of this example is as follows: setting the distance between the two support beams according to the size of the sample according to the standard, and placing and fixing the sample on the support beams; the sliding support seat enables the pinch roller to move to contact with a cam corresponding to the maximum vibration displacement of the pre-test; starting a driving motor, wherein the driving motor drives a driving rod and a cam to periodically rotate, so that a pressure rod generates periodic displacement, and a high-precision pressure sensor positioned at the tail end of the pressure rod can detect the stress on a material in real time; the pressure sensor transmits the acquired information to a computer, and the stress response of the material under different periods and different amplitudes can be obtained through conversion and calculation of a computer system.

According to the invention, a plurality of groups of cam mechanisms are introduced, periodic force is applied to a material sample by virtue of periodic rotation of the cams, the response condition of the material to the periodic force is obtained by the force sensor, and the dynamic mechanical property of the material is obtained from the surface. The device is simple to operate, durable and accurate in result, and can be widely used for developing and researching new materials of universities and enterprises.

It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a simple and easy material dynamic mechanical properties testing arrangement, a serial communication port, including a supporting bench that is used for placing the sample, locate the cam mechanism of a supporting bench top, be provided with interconnect's pinch roller and depression bar between cam mechanism and the sample, depression bar and sample surface butt, the guide mechanism is installed to the depression bar periphery and is assisted the depression bar along vertical direction motion, set up the spring under the pinch roller between terminal surface and the guide mechanism, cam mechanism includes driving motor, the actuating lever and install the cam on the actuating lever, the cam is followed the actuating lever and is driven rotatoryly by driving motor, the pinch roller contacts with rotatory cam all the time, the depression bar sets up pressure sensor with the end.

2. The device for testing the dynamic mechanical properties of the simple materials as claimed in claim 1, wherein the driving rod is provided with a plurality of cams with different specifications.

3. The simple material dynamic mechanical property testing device of claim 2, wherein the plurality of cams are arranged at equal intervals.

4. The device for testing the dynamic mechanical properties of the simple material according to claim 3, wherein the plurality of cams are arranged on the driving rod in a sequence from small to large according to specifications.

5. The device for testing the dynamic mechanical properties of a simple material according to any one of claims 1 to 4, wherein the support platform comprises a slide rail, a support base capable of moving along the slide rail, and a support beam disposed above the support base, and the sample is placed on the support beam.

6. The simplified material dynamic mechanical property testing device of claim 5, wherein the support beam can slide on the support base to determine the position of the support beam according to the size of the sample.