CN203510201U

CN203510201U - Marking gauge applicable to Hopkinson bar test

Info

Publication number: CN203510201U
Application number: CN201320607210.8U
Authority: CN
Inventors: 李洋; 王志亮
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2013-09-27
Filing date: 2013-09-27
Publication date: 2014-04-02
Anticipated expiration: 2023-09-27

Abstract

The utility model belongs to the field of the dynamic impact study, and discloses a marking gauge applicable to the Hopkinson bar test. The marking gauge comprises a thin-wall semicircular cylinder, the inner diameter of the thin-wall semicircular cylinder is the same as that of a Hopkinson bar, the center of the wall of the semicircular cylinder is provided with an empty groove parallel with the axial direction of the cylinder and another empty groove perpendicular to the empty groove, and the two empty grooves are crossed to form a cross hole. The marking gauge can simplify the process for determining the position of a strain gage in the Hopkinson bar test, improve the accuracy of the position of the strain gage and reduce the damage to the Hopkinson bar.

Description

A kind of line drawing ruler that is applicable to Hopkinson bar test

Technical field

The utility model belongs to shock dynamics test field, relates to a kind of line drawing ruler that is applicable to Hopkinson bar test.

Background technology

Along with the development of modern anti-seismic structure, protection works and national defense industry, the modern shock dynamics test based on Hopkinson bar obtains the attention of Chinese scholars just day by day, and has obtained progress at a high speed.In the Hopkinson bar process of the test of carrying out, the paste position of foil gauge often need to be determined by line drawing ruler at present.But the operating process of line drawing ruler is at present comparatively complicated, and accuracy is poor.

According to Hopkinson bar, test needs: two pieces of strain gauge adhesions are in the radial symmetric position of check bar; Foil gauge axially and check bar axial consistent.This needs line drawing ruler on check bar, to draw the crosshair of two symmetric positions.The line drawing ruler that is generally used for Hopkinson bar test is steel thin-wall semicircular cylinder.Barrel bore is identical with corresponding Hopkinson bar internal diameter.

Line drawing ruler is as follows for the operating procedure of foil gauge location positioning on check bar:

(1) by line drawing ruler and check bar close contact;

(2) along the adjacent both sides of line drawing ruler, carve with a knife lower cut;

(3) rotate line drawing ruler, by one side of line drawing ruler with axial overlap to determine symmetric position;

(4) repeat the operation of (2);

(5) utilize line drawing ruler, four drawn lines are extended and intersected, finally obtain two cross hairs, i.e. the position of test film in hopkinson test.

Because line drawing ruler has certain thickness, and the indentation on check bar is very not clear, therefore in the process of step (3) and (5), be easy to cause the error of symmetric position and the skew of extended line, this is very disadvantageous to the very high Hopkinson bar test of required precision, the operating procedure of the method is comparatively loaded down with trivial details simultaneously, and can cause damage to Hopkinson bar.

Utility model content

The purpose of this utility model is that a kind of line drawing ruler that is applicable to Hopkinson bar test is provided for the deficiencies in the prior art.

For achieving the above object, the utility model by the following technical solutions:

A kind of line drawing ruler that is applicable to Hopkinson bar test, it is characterized in that: this line drawing ruler comprises thin-walled semicircular cylinder, internal diameter equates with the internal diameter of Hopkinson bar, semicircle barrel central point offer be parallel to Cylindorical rod to dead slot and perpendicular to another dead slot of this dead slot, described two dead slots intersect and form a cross hole.。

The material of line drawing ruler is steel.

Distance between cross hole Hole both sides is less than or equal to 0.5mm.

The thickness of semicircular cylinder is less than or equal to 1mm.

The utlity model has following beneficial effect:

The line drawing ruler that the utility model provides, can simplify the process of foil gauge location positioning on Hopkinson bar.Simultaneously due to simple to operate, can reduce the error of the cross hairs position that manual operation causes, thereby make the cross hairs position that draws more accurate.The cross hairs drawing with the utility model line drawing ruler is small-sized, therefore also very little to the damage of check bar.

Accompanying drawing explanation

Fig. 1 is the front view of the utility model embodiment.Fig. 2 is top view embodiment illustrated in fig. 1.

In accompanying drawing:

1 is thin-walled semicircle barrel,

2 is the crossing cross hole in thin-walled semicircle barrel center.

The specific embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail:

The utility model line drawing ruler is comprised of thin-walled semicircular cylinder, internal diameter equates with the internal diameter of corresponding Hopkinson bar, semicircle barrel 1 center has and is parallel to respectively cylinder laterally and two crossing cross holes 2 radially, between cross hole, is interconnective, very close to each other.

The material of line drawing ruler is steel.

Distance between cross hole 2 Hole both sides, the distance between the distance between first side 21 and Second Edge 22, the 3rd limit 23 and the 4th limit 24 is all less than or equal to 0.5mm.

The thickness of semicircular cylinder is less than or equal to 1mm.

Line drawing ruler is as follows for determining the operating process of the position of foil gauge on Hopkinson bar:

(1) get two line drawing rulers of the present utility model, highly equal;

(2) two line drawing rulers in (1) are closely fitted on check bar, between line drawing ruler, also fit tightly;

(3) with art designing's pocket knife, along the cross hole on two line drawing rulers, on Hopkinson bar, delineate;

(4) from check bar, take off two line drawing rulers, check that whether cross hairs is clear;

(5) on check bar, the position of two cross hairs is the position of foil gauge.

Adopt this line drawing ruler to determine the position of foil gauge on Hopkinson bar, simple to operate, the position of the foil gauge obtaining is accurate, and little to the damage of Hopkinson bar.

The above-mentioned description to embodiment is can understand and use the utility model for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the utility model is not limited to above-described embodiment, and those skilled in the art are according to announcement of the present utility model, and not departing from the improvement that the utility model category makes and revise all should be within protection domain of the present utility model.

Claims

1. one kind is applicable to the line drawing ruler that Hopkinson bar is tested, it is characterized in that: this line drawing ruler comprises thin-walled semicircular cylinder, internal diameter equates with the internal diameter of Hopkinson bar, semicircle barrel (1) central point offer be parallel to Cylindorical rod to dead slot and perpendicular to another dead slot of this dead slot, described two dead slots intersect and form a cross hole (2).

2. the line drawing ruler that is applicable to Hopkinson bar test according to claim 1, is characterized in that: the material of line drawing ruler is steel.

3. the line drawing ruler that is applicable to Hopkinson bar test according to claim 1, is characterized in that: the distance between cross hole both sides is less than or equal to 0.5mm.

4. the line drawing ruler that is applicable to Hopkinson bar test according to claim 1, is characterized in that: the thickness of semicircular cylinder is less than or equal to 1mm.