CN202994595U

CN202994595U - Young modulus measurement experimental apparatus

Info

Publication number: CN202994595U
Application number: CN 201220693941
Authority: CN
Inventors: 钱丽敏; 应雄纯
Original assignee: Huzhou University
Current assignee: Huzhou University
Priority date: 2012-12-01
Filing date: 2012-12-01
Publication date: 2013-06-12
Anticipated expiration: 2022-12-01

Abstract

The utility model discloses a Young modulus measurement experimental apparatus. The apparatus comprises a clock type dial indicator (15), wherein the clock type dial indicator (15) is fixed on a fixing platform (5) by a fixing bracket (14), so that a micro measurement guide rod (12) is in contact with the upper surface of a sliding clamp head (4), when the weights (6) are increased or reduced, the sliding clamp head (4) for tightly clamping a metal wire (2) moves up and down along with the stretching and the retraction of the metal wire (2), the micro metal wire stretch tensor can be read out through the variation of the position of the pointer of the dial indicator (15), and thus, the Young modulus of the measured metal wire (2) is solved. For the Young modulus measurement experimental apparatus which measures the metal wire by a stretching and retraction method, elements, such as a telescope (8) and an optical lever (3) in the original apparatus, are canceled, a direct-read method is used, and thus, the actual measurement can be simpler and faster.

Description

A kind of Young modulus experiments of measuring device

Technical field

The utility model relates to a kind of physics facility, relates in particular to a kind of experimental facility for measuring Young modulus of metal wire by stretching method.

Background technology

It is to make stressed object generation deformation that masterpiece is used for one of caused effect of object, and the deformation of object can be divided into elastic deformation and plastic deformation.The elastic deformation of solid material can be divided into again vertically, shear, torsion, bending, can describe with Young modulus the ability of material opposing deformation for longitudinal elasticity deformation.Young modulus is an important physical quantity that characterizes solid material character, is one of important parameter that in engineering design, the selection of material need relate to often, and is general only relevant with material character and temperature, irrelevant with its geometric configuration.

If former long L wiry, cross-sectional area is S, and after application of force F, its length changes Δ L along its length, and the vertical F/S that is subject on the tinsel unit area is called normal stress, and relative elongation Δ L/L wiry is called line strain.Experimental result points out, in elastic range, by Hooke's law as can be known the normal stress of object be directly proportional to line strain, namely

Scale-up factor Y is Young's modulus of elasticity.

For the tiny length of measuring fine wire changes, generally used the optical lever amplifying method in experiment, the effect of optical lever is that tiny length is changed the change in location that is enlarged on scale, the tiny length of indirectly trying to achieve the steel wire elongation by the linear measure longimetry of easier Measurement accuracy changes, and Telescope and optical lever form measuring system as shown in Figure 1.

The upper end of tinsel 2 is clamped in fixed chuck 1.There is a platform that can move up and down 5 at its middle part, is used for support optical lever 3.A circular hole is arranged on platform, a chuck that can slide up and down 3 is arranged in the hole, tinsel 2 is clamped in chuck 3.Hang with counterweight 6 below tinsel 2, the optical lever 3 that is placed on platform can be amplified in the subtle change of tinsel 2 length on scale 7, and measures by telescope 8.

This experiment for many years, is to observe resembling of scale label in the optical lever catoptron with telescope always, and obtains the steel wire length variable quantity by the change in location of measuring elephant.But in fact in student experimenting, because range of telescope is little, the student feels difficulty when telescope adjustment and measurement, the student is difficult to see by adjusting the scale label that optical lever reflects back in telescope, even completely do not become the measurement task, telescope also is being easy to damage in a large amount of student's Reusabilities.

The utility model is also to measure Young modulus wiry with the static stretch method, but measurement instrument adopts the dial gauge of clock-type, makes that experimental technique is easy, directly perceived, precision is high.

The utility model content

The purpose of this utility model is to provide directly perceived, the effective pulling method of a kind of method and measures Experiment of Measuring Young's device wiry.

The purpose of this utility model is achieved through the following technical solutions:

Pulling method of the present utility model is measured Experiment of Measuring Young's device wiry, comprising:

Measure small elongation wiry with the clock-type dial gauge.

Described clock-type dial gauge is comprised of index dial 9, pointer 11, axle sleeve 10 and micrometer guide rod 12, and measurement range is the 0-5 millimeter, and measuring accuracy is 0.01 millimeter, as shown in Figure 2.

The clock-type dial gauge is fixed on stationary platform 5 with fixed mount 14, micrometer guide rod 12 is contacted with the upper surface of sliding clamp 4, when increasing or reduce counterweight 6, clamp the sliding clamp 4 of tinsel 2 with flexible moving up and down wiry, this small tinsel 2 strokes can be read out by the variation of dial gauge pointer 11 positions, and then obtain tested Young modulus wiry.

Can be found out by the technical scheme that above-mentioned the utility model provides, pulling method described in the utility model is measured Experiment of Measuring Young's device wiry, cancelled telescope in original-pack system, optical lever etc., adopted the direct-reading method, made actual measurement more simple, quick.

Description of drawings

Fig. 1 is original experimental facility for measuring Young modulus of metal wire by stretching method schematic diagram

Fig. 2 is clock-type dial gauge schematic diagram

Fig. 3 is the utility model experimental facility for measuring Young modulus of metal wire by stretching method schematic diagram.

In figure: 1, fixed chuck, 2, tinsel, 3, optical lever, 4, sliding clamp, 5, stationary platform, 6, counterweight, 7, scale, 8, telescope, 9, dial plate, 10, axle sleeve, 11, pointer, 12, the micrometer guide rod, 13, support, 14, fixed mount, 15, dial gauge.

Embodiment

Experimental facility for measuring Young modulus of metal wire by stretching method of the present utility model, its better embodiment as shown in Figure 3.

1, regulate support 13 stationary platform 5 is the level of state, a circular hole is arranged on stationary platform 5, a chuck 4 that can easy on and off slides is arranged in the hole, tinsel 2 is clamped in sliding clamp 4, hangs with counterweight 6 below tinsel 2.

2, clock-type dial gauge 15 use fixed mounts 14 are fixed on stationary platform 5, make the upper surface good contact of micrometer guide rod 12 and sliding clamp 4 and keep vertical, and the reading of dial gauge 15 during the record zero load.

3, by increasing gradually counterweight 6 or reducing counterweight 6, record the reading of dial gauge, can measure the Young modulus of this tinsel 2.

In the present embodiment, each counterweight that increases by 1 kilogram, until 10 kilograms, record the reading of dial gauge 15, by the difference of adjacent twice reading obtain increase counterweight, be the elongation Δ L of tinsel L after the stressed F of tinsel, repeat 3 times, ask its mean value, utilize the average elongation amount of obtaining 1 kilogram of counterweight tinsel 2 of every increase by poor method

Measure length L and the diameter d of tinsel 2, with measurement data substitution following formula

Can try to achieve the Young modulus of tinsel 2.

The utlity model has following features:

Measure simply, general student instructs a little all and can complete at short notice the measurement task;

Measuring accuracy is high, and owing to adopting the clock-type dial gauge to measure, measured value is clear eye-catching, directly reads, and has eliminated the every error in former measuring method, has improved measuring accuracy.

Claims

1. Young modulus experiments of measuring device, it is characterized in that: clock-type dial gauge (15) is fixed on stationary platform (5) with fixed mount (14), a chuck (4) that can easy on and off slides is arranged in the circular hole on stationary platform (5), tinsel (2) is clamped in sliding clamp (4), hang with counterweight (6) below tinsel (2), micrometer guide rod (12) contacts with the upper surface of sliding clamp (4), when increasing or reduce counterweight (6), easy on and off moves with the flexible of tinsel (2) to clamp sliding clamp wiry (4).