KR20160001090U

KR20160001090U - Ctod specimen clamp according to the shape deformation angle

Info

Publication number: KR20160001090U
Application number: KR2020140006949U
Authority: KR
Inventors: 권순성; 문을석
Original assignee: 대우조선해양 주식회사
Priority date: 2014-09-24
Filing date: 2014-09-24
Publication date: 2016-04-04

Abstract

The present invention relates to a deformation clamp according to the shape angle of a CTOD (Crack-tip Opening Displacement) test piece. The deformable clamp has a shape of '∩' shape having an opening portion 300 with one side opened to cover the CTOD test piece T, 1,2 grip member (100,200); First and second hinge brackets (110, 210) protruding from opposite sides of the first and second holding members (100, 200) facing each other; A hinge pin 400 that is rotatably coupled through the first and second hinge brackets 110 and 210; An eye bolt 500 integrally formed on an upper surface or an upper surface of either one of the first and second holding members 100 and 200; And a fixing bolt (BT) fastened to a plurality of bolt holes (BH) formed on both sides of the first and second holding members (100, 200) to fix the CTOD test piece (T) Provides an angled strain clamp.
According to the present invention, since the specimen is removed by using a dedicated clamp which can cope with the breakage shape of the test piece, the safety accident can be prevented and the convenience of the work can be improved.

Description

{CTOD SPECIMEN CLAMP ACCORDING TO THE SHAPE DEFORMATION ANGLE}

The present invention relates to a deformation clamp according to the shape angle of a CTOD (Crack-tip Opening Displacement) test specimen, more specifically, an improved CTOD test piece for easy and safe transfer of a test piece with a simple fastening in a narrow space. .

In general, the resistance to brittle fracture is divided into resistance to brittle crack generation and resistance to brittle crack propagation.

Brittle crack initiation means that brittle cracks are formed from fatigue cracks grown when external stresses are applied after fatigue cracks originating from defects (usually welds) in the structure have grown to a certain size.

In this case, the resistance characteristic of the material which prevents brittle cracks is called resistance against brittle crack generation, and the resistance is evaluated mainly by the CTOD (Crack Type Opening Displacement) test method specified in BS 7448 or ASTM 1290 .

Related prior arts are disclosed in Patent No. 0961397, No. 1132002, and the like.

However, since the test work space is narrow when the test piece is removed after the test, it is difficult to lift the test piece, which is heavy (30-50 kg) by hand, and the jig used for demolishing the test piece is weak There is a problem that a serious safety accident occurs when it is separated.

Particularly, in the case of the fractured test piece, since the angle of the shape is different, it is difficult to develop all of the jigs corresponding thereto, and if it is broken in a unique shape, it is inevitable to utilize the demolishing method by hand.

Therefore, there is a high risk of safety accidents, such as the operator's finger being stuck on the corners or broken edges during the demolition of the fractured specimen.

The present invention has been made in view of the above-mentioned problems in the prior art, and it is an object of the present invention to provide a CTOD test piece which can be easily and conveniently used in a narrow space, The CTOD specimen has a main purpose of providing a deformation clamp according to the angle of shape.

The first and second gripping members 100 and 200 having an open portion 300 with one side open to cover the CTOD test piece T are provided with means for attaining the above object. First and second hinge brackets (110, 210) protruding from opposite sides of the first and second holding members (100, 200) facing each other; A hinge pin 400 that is rotatably coupled through the first and second hinge brackets 110 and 210; An eye bolt 500 integrally formed on an upper surface or an upper surface of either one of the first and second holding members 100 and 200; And a fixing bolt (BT) fastened to a plurality of bolt holes (BH) formed on both sides of the first and second holding members (100, 200) to fix the CTOD test piece (T) Provides an angled strain clamp.

At this time, the widths of any one of the first and second hinge brackets 110 and 210 may be smaller than the widths of the other brackets to overlap each other.

The handle 600 is further provided on one side of each of the first and second holding members 100 and 200.

In addition, the first and second holding members 100 and 200 are characterized in that a plurality of holes H are formed on the upper surface or both side surfaces of the first and second holding members 100 and 200 so as to reduce weight.

According to the present invention, a safety accident can be prevented because the test piece is dismantled by using a dedicated clamp which is capable of angular response according to the fracture shape of the test piece.

In addition, the convenience of the work is improved.

In addition, since the test piece can be safely removed without dropping, it is possible to prevent the equipment damage due to collision with peripheral equipment.

1 is an exemplary perspective view of a strain clamp according to the shape angle of a CTOD test piece according to the present invention.
Fig. 2 is a view showing an example of using a deformation clamp according to the shape angle of a CTOD test piece according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description of the present invention, the following specific structures or functional descriptions are merely exemplified for the purpose of describing the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. It is to be understood, however, that the appended claims are intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the appended claims, rather than limiting the embodiments in accordance with the concepts herein.

As shown in FIGS. 1 and 2, the deformation clamp according to the CTOD test piece shape angle according to the present invention includes the first and second holding members 100 and 200.

At this time, the first and second holding members 100 and 200 are formed in a substantially '∩' shape and have an opening 300 with one side thereof opened.

In this case, the opening 300 is formed to be larger than the width of a conventional CTOD test piece T.

A first hinge bracket 110 and a second hinge bracket 210 are integrally formed on both sides of the first and second holding members 100 and 200 facing each other.

In this case, the first and second hinge brackets 110 and 210 may have a width smaller than that of the other brackets so that the first and second hinge brackets 110 and 210 overlap each other.

The first and second hinge brackets 110 and 210 are inserted in the width direction of the first and second holding members 100 and 200 so that the first and second holding members 100 and 200 are engaged with the hinge pin 400, (400) as a rotating shaft.

At this time, the hinge pin 400 preferably has a fixing bolt shape, and the first and second holding members 100 and 200 can be prevented from separating from and separating from the hinge pin 400 by fastening.

An eye bolt 500 is welded to the upper surface of either one of the first and second holding members 100 and 200 so as to be lifted up by a hoist.

Particularly, the first and second holding members 100 and 200 are further provided with the handle 600 on one side thereof, so that the CTOD clamp can be easily and conveniently lifted when moving the CTOD clamp according to the present invention.

In addition, a plurality of bolt holes BH are formed in the right and left sides of the first and second holding members 100 and 200, respectively, and a fixing bolt BT is fastened to the bolt hole BH.

In this case, the fixing bolts BT are provided to firmly fix the CTOD test piece T on the clamp when the CTOD test piece T is removed.

A plurality of holes (H) are formed on the upper surface or both side surfaces of the first and second holding members (100, 200) for reducing the weight of the clamp by a function of wiping.

The present invention having such a configuration can be used as follows.

The CTOD test piece (T) used in the test shall be dismantled, and the operator may use the clamp according to the present invention.

That is, each of the openings 300 of the first and second holding members 100 and 200 is pressed onto the CTOD test piece T.

Then tighten bolt (BT) to bolt hole (BH) and tighten bolt with specified torque.

At this time, the tightening torque is maintained at about 70-90 kg / cm 2, particularly preferably about 80 kg / cm 2.

When all of the plurality of fixing bolts BT are tightened through this process, the CTOD test piece T can be lifted.

The clamp according to the present invention is capable of freely bending or rotating the first and second holding members 100 and 200 around the hinge pin 400 so that even if the test piece is broken with a shape angle of a somewhat unique shape, So that the fixability can be improved and the workability in the narrow space can be improved.

Thereafter, when the hook of the hoist is hooked on the eye bolt 500 and the hoist is operated and hoisted, the test piece can be safely and easily lifted and removed.

Since the clamp according to the present invention has a foldable structure, it can be folded in accordance with the shape of the test piece in spite of its unique cross-sectional shape, thereby providing a stable supporting force, thereby reducing the risk of safety accidents.

100: first grip member 200: second grip member
300: opening part 400: hinge pin
500: Eyebolt 600: Handle

Claims

'∩' -shaped first and second holding members (100,200) having an opening (300) with one side open to cover the CTOD test piece (T);
First and second hinge brackets (110, 210) protruding from opposite sides of the first and second holding members (100, 200) facing each other;
A hinge pin 400 that is rotatably coupled through the first and second hinge brackets 110 and 210;
An eye bolt 500 integrally formed on an upper surface or an upper surface of either one of the first and second holding members 100 and 200;
And a fixing bolt (BT) fastened to a plurality of bolt holes (BH) formed on both sides of the first and second holding members (100, 200) to fix the CTOD test piece (T) Deformation clamp according to angle.

The method of claim 1,
Wherein the width of one of the first and second hinge brackets (110, 210) is smaller than the width of the other bracket, so that the first and second hinge brackets (110, 210) can overlap each other.

The method of claim 1,
The deformable clamp according to claim 1, further comprising a handle (600) on one side of each of the first and second holding members (100, 200).

The method of claim 1,
A plurality of holes (H) are formed on the upper surface or both side surfaces of the first and second holding members (100, 200) so as to reduce the weight.