CN207163810U - A kind of bending method based on amesdial surveys Experiment of Measuring Young's device - Google Patents

Abstract

The utility model discloses an experimental device for measuring Young's modulus by bending method based on a dial gauge, which belongs to the technical field of physical instruments, and is characterized in that the dial gauge is used to replace the reading microscope and the Hall element used in the existing measuring device , under the premise of ensuring the accuracy, the measurement process is simplified; the limit line and the limiter are used to ensure that the center position of the beam to be tested is stressed; the principle of lever amplification is used to improve the accuracy of the experiment; the utility model can solve the existing The bending method Young's modulus device has the defects of large measurement error, easy fatigue and complicated operation. It has the advantages of simple and compact structure, ingenious design, high measurement accuracy and easy operation. It is popularized and applied as a kind of university physics experiment instrument in colleges and universities.

Description

An experimental device for measuring Young's modulus by bending method based on a dial gauge

Technical field:

The utility model relates to the technical field of physical instruments, in particular to an experimental device for measuring Young's modulus by a bending method based on a dial indicator, which can realize accurate measurement of the Young's modulus of a beam by using the bending method.

Background technique:

Young's modulus is a basic mechanical parameter that characterizes the elastic deformation properties of solid materials. It is also an important basis for selecting mechanical components in engineering design. The measurement of Young's modulus is of great significance in scientific research and technical applications. There are many existing methods for measuring Young's modulus, such as tensile method, bending method, optical lever method, interference fringe method, resonance method, etc. Each method has its own characteristics and is suitable for different test conditions. Among them, the bending method is to use the micrometer eyepiece or Hall displacement sensor to measure the downward movement of the center of the beam to be measured under the action of external force, so as to obtain the Young's modulus. However, the existing bending method Young's modulus measurement device has defects such as large measurement error, difficult operation and easy fatigue of the measurement personnel. Therefore, there is an urgent need for an experimental device for measuring Young's modulus by bending method, which has the advantages of simple and compact structure, ingenious design, high measurement accuracy and easy operation.

Invention content:

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art, and provide a kind of bending method measuring Young's modulus experimental device based on the dial indicator; There are many problems such as large error, difficult operation and easy fatigue of measuring personnel.

The technical scheme of the utility model is: an experimental device for measuring Young's modulus by bending method based on a dial indicator, which is special in that it includes a base, a weight, a weight frame, a first supporting column, and a dial indicator support Seat, dial indicator, metal wire drawing, metal rod, second support column, rotating shaft, knife edge, beam to be tested, third support column, weight tray; the first support column is set at the central position of the upper surface of the base, and the first A weight rack is arranged at the horizontal position on the right side of the supporting column, and the weight is placed on the weight rack; The column is the center, and the left and right symmetrical positions of the rear are respectively provided with a second support column and a third support column; the top of the first support column is provided with a rotating shaft, which is connected to a metal rod, and the front end of the metal rod is connected to a dial indicator through a metal wire drawing , the rear part is connected with the edge of the knife; the beam to be measured is placed on the top of the second support column and the third support column through the inside of the edge of the knife, and a weight tray is fixed at the bottom of the edge of the knife to place weights; There are a first limit hole and a second limit hole, and the first limit line and the second limit line are engraved on the symmetrical positions on the left and right sides of the limit hole. The distance between the second limit line and the distance between the second support column and the third support column is equal; the left and right symmetrical positions on the inner side of the top of the knife edge are provided with a first limiter and a second limiter, and the knife edge The distance between the first limiter and the second limiter is the same as the distance between the first limiter hole and the second limiter hole.

Further, the length ratio n of the rear part and the front part of the metal rod with the rotation axis as the dividing point, and n>1.

Compared with the prior art, a kind of bending method measuring Young's modulus experimental device based on a dial gauge described in the utility model has the following positive effects: 1, by adding a limit line and a limit hole on the beam to be tested, A limiter is added on the edge of the knife to ensure the force on the center of the beam to be tested; 2. The data measurement method combining the dial gauge and the principle of lever amplification is used to greatly improve the experimental accuracy of the small downward movement of the center of the beam. The measurement process is also greatly simplified; 3. It has the advantages of simple and compact structure, ingenious design, high measurement accuracy and easy operation.

Description of drawings:

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Fig. 2 is the structural representation of the beam to be measured of the utility model;

Fig. 3 is a schematic structural view of the knife edge of the present invention.

Detailed ways:

The utility model will be further described below in conjunction with the accompanying drawings of the description.

Embodiment 1, referring to Fig. 1, 2, 3, base 1 is processed according to the design requirements, and base 1 is used for carrying other parts of the device, and a first support column 4 is set at the center of the upper surface of base 1, and a first support column 4 is installed on the first support column 4 A weight frame 3 is arranged at the horizontal position on the right side for placing weights 2; a dial indicator support seat 5 is arranged at the front of the first support column 4 for fixing the dial indicator 6; centered on the first support column 4, A second support column 9 and a third support column 14 are arranged at the rear left and right symmetrical positions; a rotating shaft 10 is installed on the top of the first supporting column 4, and the rotating shaft 10 is connected with the metal rod 8, and the metal rod 8 rear part is fixed by the metal rod 11 It is connected with the knife edge 12, the front end is connected with the dial indicator 6 through the metal drawing wire 7, the length ratio n of the rear part and the front part of the metal rod 8 with the rotating shaft 10 as the dividing point, and n>1; the crossbeam 13 to be measured passes through The inside of the knife edge 12 is placed on the top of the second support column 9 and the third support column 14, and the bottom of the knife edge 12 is fixed with a weight tray 15 for placing the weight 2; the upper and lower symmetrical positions of the center of the beam 13 to be tested are provided with a first limit hole 16 and the second limit hole 18, the first limit line 17 and the second limit line 19 are engraved on the symmetrical positions of the left and right sides of the limit hole, and the first limit line 17 of the crossbeam 13 to be measured is in the non-stressed state. The distance between the second limit line 19 is equal to the distance between the second support column 9 and the third support column 14; a stopper 20 and a stopper 21 are arranged at the left and right symmetrical positions on the inside of the top of the knife edge 12, and the knife edge 12 The spacing between the first limiter 20 and the second limiter 21 is the same as the spacing between the first limiter hole 16 and the second limiter hole 18; the composition is based on the bending method of the dial gauge to measure Young's modulus Quantitative experimental device.

A kind of bending method measuring Young's modulus experiment device based on the dial indicator described in the utility model, when working, the crossbeam to be tested is placed on the top of the second supporting column and the third supporting column through the inside of the knife edge, so that the two sides of the beam are The limit line at the end is aligned with the top of the second support column and the third support column respectively, and the two limiters of the knife edge are placed on the limit hole and the limit hole in the middle of the beam to be tested, and the rear part of the metal rod passes through the metal rod The fixing screw is connected to the knife edge, and the front end is connected to the dial indicator through a metal wire drawing. Pre-add a weight on the weight tray to make the dial indicator have an initial reading, and then add weight to the weight tray to record the thousand points. The reading of the dial gauge, and then calculate the reading change before and after the weight is added to the dial gauge. The data directly read by the dial gauge divided by n is the downward movement of the metal beam to be tested under the tension of the weight. According to Young The Young's modulus of the beam to be tested can be obtained from the relationship between the modulus and the downward movement of the center.

Claims (2)

1. An experimental device for measuring Young's modulus by bending method based on a dial gauge, characterized in that it comprises a base (1), a weight (2), a weight frame (3), a first support column (4), Dial indicator support seat (5), dial indicator (6), metal drawing (7), metal rod (8), second support column (9), rotating shaft (10), knife edge (12), beam to be tested ( 13), the third support column (14), the weight tray (15); the first support column (4) is set at the central position of the upper surface of the base (1), and the horizontal position on the right side of the first support column (4) is set The weight frame (3), the weight (2) is placed on the weight frame (3); the first support column (4) is provided with a dial indicator support seat (5) directly in front, and the dial indicator support seat (5 ) to fix the dial indicator (6); with the first support column (4) as the center, the rear left and right symmetrical positions are respectively provided with the second support column (9) and the third support column (14); the first support A rotating shaft (10) is arranged on the top of the column (4), and the rotating shaft (10) is connected with the metal rod (8). 12) Connection; the beam to be tested (13) passes through the knife edge (12) and placed on the top of the second support column (9) and the third support column (14), and the bottom of the knife edge (12) is fixed with a weight tray (15), Place the weight (2); the upper and lower symmetrical positions of the center of the beam to be tested (13) are provided with a first limit hole (16) and a second limit hole (18), and engraved on the left and right sides of the limit hole There is a first limit line (17) and a second limit line (19), and the beam to be tested (13) is between the first limit line (17) and the second limit line (19) in a non-stressed state The distance between the second support column (9) and the third support column (14) is equal to the distance between the second support column (9) and the third support column (14); the left and right symmetrical positions on the inner side of the top of the knife edge (12) are provided with a first limiter (20) and a second limiter Stopper (21), the distance between the first stopper (20) and the second stopper (21) of the knife edge (12) and the first stopper hole (16) and the second stopper hole (18) The spacing between them is the same. 2. A kind of experimental device for measuring Young's modulus by bending method based on a dial gauge according to claim 1, characterized in that, the rear part of the metal rod (8) with the rotating shaft (10) as the dividing point and the The front length ratio value n, and n>1.