CN205749126U - Extensometer method measure apparatus of youngs modulus - Google Patents

Abstract

The extensometer Young's modulus tester belongs to the field of teaching and experimental instruments, including a bracket, an upper chuck, a lower chuck, an extensometer, a tension sensor and a force handwheel; the bracket is a mesh structure; the upper chuck is installed on the On the first beam; the lower chuck is installed on the second beam of the bracket; the force hand wheel is installed on the third beam of the bracket; the extensometer is installed on the measured metal wire between the first beam and the second beam of the bracket The tension sensor is installed on the connector between the second beam and the third beam of the bracket; the two ends of the metal wire to be measured are respectively fixed in the upper chuck and the lower chuck; the upper end of the tension sensor is connected with the lower chuck, and the lower end It is connected with the booster handwheel; the booster handwheel exerts a downward force on the tension sensor, the tension sensor measures the force on the tested metal wire, and the extensometer measures the elongation of the tested metal wire. The instrument adopts a portal frame design, eliminating the need for optical levers and scale telescopes, which is easy to operate, advanced in technology, and novel in design.

Description

Extensometer method Young's modulus tester

technical field

The utility model belongs to the field of teaching experiment instruments, in particular to an extensometer method Young's modulus measuring instrument.

Background technique

Young's modulus, which is the modulus of elasticity in the longitudinal direction, is also a term in mechanics of materials. According to Hooke's law, within the elastic limit of the object, the stress and strain become proportional, and the ratio is called the Young's modulus of the material, which is a physical quantity that characterizes the properties of the material and only depends on the physical properties of the material itself. The size of Young's modulus marks the rigidity of the material, and the larger the Young's modulus, the less likely it is to deform.

Most of the existing Young's modulus tests adopt the static method. The static method refers to applying a constant bending stress on the sample to measure its elastic bending deflection, or applying a constant stretch (or compression) to the sample. Stress, measure its elastic deformation; or calculate elastic modulus according to stress and strain. Most of the static methods use optical levers and telescopes to measure Young's modulus. The disadvantages are that the amount of samples is large, the volume of the instrument is large, the accuracy is low, and repeated measurements cannot be made.

Utility model content

In order to solve the problems existing in the prior art, the utility model provides an extensometer method Young's modulus measuring instrument, which overcomes the complex equipment in the prior art that must use optical levers and telescopes, and has low accuracy and other shortcomings.

The technical solution adopted by the utility model to solve technical problems is as follows:

Extensometer method Young's modulus tester, the tester includes a bracket, an upper chuck, a lower chuck, an extensometer, a tension sensor and a force applying device; the bracket is a mesh structure; the upper chuck is installed on the bracket On the first beam of the bracket; the lower clamp is installed on the second beam of the bracket; the force device is installed on the third beam of the bracket; the two ends of the measured metal wire are respectively fixed on the upper clamp and the lower clamp inside the head; the extensometer is installed on the metal wire to be tested; the upper end of the tension sensor is connected to the lower chuck, and the lower end is connected to the force applying device; The magnitude of the force, the extensometer measures the elongation of the measured wire.

The beneficial effects of the utility model are: the main structure of the instrument adopts a portal frame design, which saves the traditional optical lever and scale telescope, which is easy to operate, advanced in technology, novel in design, and leading in the country.

Description of drawings

Fig. 1 is the front view of the extensometer method Young's modulus tester of the utility model.

Fig. 2 is a schematic diagram of the host computer and digital display table of the extensometer method Young's modulus measuring instrument of the utility model.

In the figure: 1. Upper chuck, 2. Metal wire to be tested, 3. Bracket, 4. Lower chuck, 5. Second beam, 6. Afterburner handwheel, 7. Adjustable feet, 8. Base platform , 9, the third beam, 10, tension sensor, 11, the first beam, 12, extensometer 13, digital display table.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

As shown in Fig. 1 and Fig. 2, extensometer method Young's modulus measuring instrument, this measuring instrument comprises support 3, upper chuck 1, lower chuck 4, extensometer 13, tension sensor 10 and booster handwheel 6; The bracket 3 is a mesh structure; the upper chuck 1 is installed on the first beam 11 of the bracket 3; the lower chuck 4 is installed on the second beam 5 of the bracket 3; On the third crossbeam 9 of the support 3; the two ends of the measured wire 2 are respectively fixed in the upper clamp 1 and the lower clamp 4; the extensometer 13 is installed on the first crossbeam 11 and the second On the measured metal wire 2 between the beams 5; the upper end of the tension sensor 10 is connected with the lower chuck 4, and the lower end is connected with the afterburner hand wheel 6; the adjustable foot 7 is installed on the base platform 8 of the bracket 3, and the Young's mold is adjusted Whether the measuring instrument is on a horizontal plane. Rotate the booster hand wheel 6, rotate along the bolt, and the bolt moves downward, applying a downward force to the tension sensor 10, and the measured metal wire 2 is deformed. At this time, the tension sensor 10 measures the force of the measured metal wire 2 , the extensometer 13 measures the elongation of the measured metal wire 2 . The tension sensor 10 and the extensometer 13 transmit the measurement data to the digital display table through the data line, and the digital display table calculates the Young's modulus of the measured metal wire 2 through the calculation formula E=F L/SΔL of the Young's modulus; wherein F is the tension value of the tested metal wire 2, L is the gauge length value of the extensometer of the tested metal wire 2, S is the cross-sectional area value of the tested metal wire 2, and ΔL is the deformation value of the extensometer of the tested metal wire 2 .

Main technical parameters of the utility model:

1. Maximum pulling force (N): 30

2. Rally display resolution value (N): 0.001

3. Extensometer gauge length (mm): 100

Extensometer range (mm): 5

4. Extensometer deformation display resolution value (mm): 0.001

5. Steel wire (mm): L＝400Φ＝0.50

Steel wire (mm): L=400Φ=0.80.

Claims (2)

1. Extensometer method Young's modulus measuring instrument, it is characterized in that, this measuring instrument comprises support, upper chuck, lower chuck, extensometer, tension sensor and force-applying device; Described support is eye-shaped structure; Upper clamp The head is installed on the first beam of the bracket; the lower chuck is installed on the second beam of the bracket; the force applying device is installed on the third beam of the bracket; Inside the upper chuck and the lower chuck; the extensometer is installed on the metal wire to be tested; the upper end of the tension sensor is connected with the lower chuck, and the lower end is connected with the force applying device; the force applying device exerts downward force on the tension sensor, and the tension sensor Measure the force of the tested metal wire, and the extensometer measures the elongation of the tested metal wire. 2. extensometer method Young's modulus measuring instrument according to claim 1, is characterized in that, this measuring instrument also comprises digital display meter; The output signal of described extensometer and tensile sensor is transmitted on the digital display meter, and digital display meter The display shows the deformation value, tension value, and the ratio of tension value to deformation value of the measured metal wire.