FIELD OF THE INVENTION:
The present invention relates to a device attached to a testing machine to hold metallic samples. More particularly, the present invention relates to a detachably attachable device for a standard impact testing machine for testing of plane and weld steel sheets (<5 mm thick) for assessing crash-resistance properly of the steel sheet structure in automotives.
BACKGROUND OF THE INVENTION
In a process of impact testing in known testing machines, a selected specimen (usually square bar shaped) is struck and broken by a single blow of an hammer. The energy absorbed in breaking the specimen is measured and reported as toughness value of that material. Standard and sub-standard Izod and Charpy impact testing (ASTM E 23 - 05) are prevalent for evaluation of toughness of metal plates and their welds. However, these tests are not appropriate for sheet metal (thickness <5 mm). The mechanism of impact loading to sheet metal is not simple as it bends always. So far no standard method for such purpose is in existence. Prior Art literatures as under:

1. Emin Bayraktar, Dominique Kaplan, Marc Grumbach; Application of impact tensile testing to spot welded sheets; Journal of Materials Processing Technology 153-154 (2004) 80-86.
2. Emin Bayraktar, Dominique Kaplan, Marc Grumbach; Application of impact tensile testing to welded thin sheets; Journal of Materials Processing Technology 145 (2004) 27-39,
disclose and suggest about the impact tensile tests instead of conventional impact tests. These literatures say about some external support to the sheet so that the support along with the sheet can take the impact loading, but they do not reveal details regarding fixture, equipment and testing methodology.
OBJECTS OF THE INVENTION:
It is therefore, an object of the present invention to propose a detachably attachable device for standard impact testing machines for testing of plane and weld steel sheets, which eliminates the disadvantages of prior Art.

Another object of the present invention is to propose a detachably attachable device for standard impact testing machines for testing of plane and weld steel sheets, which is handy and easy to operate.
A further object of the invention is to propose a detachably attachable device for standard impact testing machines for testing of plane and weld steel sheets, which is capable to measure toughness of plane steel sheets materials and welded steel sheets materials having thickness less than 5 mm.
A still further object of the invention is to propose a detachable attachable device for standard impact testing machines for testing of plane and weld steel sheets, which is economic in manufacturing and eco-friendly.
Yet further object of the invention, is to propose a detachably attachable device for standard impact testing machines for testing of plane and weld steel sheets, which is adaptable in any standard impact testing machine for testing activity. SUMMARY OP THE INVENTION:
According to the present invention, there is provided in a first aspect a detachably attachable device in a standard impact machine to hold and test plane or welded steel sheet material of thickness between 1 mm to 5mm, the

machine having at least two jaws, a hammer or pendulum, a tool holder, and a dial gauge, the device comprising a shaped steel block member having an inside threaded hole disposed at an one sided web face and a recess configured at the top of surface of the shaped block , a lower part of the block holding a testing sample is enabled for insertion in the holding means of the machine; a right angle shaped wage block having an inside threaded hole configured at the bottom surface of the wage block ; and at least two screws for fastening the specimen , wherein the first screw is fixed with the block and the second screw is fastened with the wage block .
In a second aspect of the invention, there is provided a process of impact testing
of plane or welded steel sheet material of thickness between 1 mm to 5mm in a
standard impact testing machine having a detachably attached device, the
process comprising the steps of making a notch on the testing specimen at
desire location; fixing a first end of the specimen with a shaped block
by atleast one first screw ;fixing a second end of the specimen with a wage
block by atleast one second screw (II), the second end of
the specimen being placed on an inclined plane of the wage
block ,the wage block disposed on the top surface of the shaped block ; placing
a lower part of the sample at the shaped block into
holding means of the impact machine; allowing a hammer of the impact machine to free fall and to hit the wage block which imparts an impact tensile load ca"sing a breakage of the specimen from the notch region; and recording the total absorbed energy from a dial gauge of the machine.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig 1(a)- Shows an elevational view of a standard pendulum type impact
testing machine accommodating test specimen according to prior Art.
Fig. 1(b)- shows an end view of Fig. 1(a).
Fig. 2(a)-Shows a schematic drawing of the invented device with T shaped steel
block.
Fig. 2(b)- Shows the wage block of the inventive device.
Fig 3 - Shows a sheet sample mounted on the device of the invention.
Fig 4 - Shows the inventive device with a sheet sample mounted on the holder of
the standard impact testing machine.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION:
As shown in Fig. 2, the device comprising a T shaped steel block member (1) and a wage block steel member (3). The T shaped steel member is provided with an inside thread hole (2) configured at the middle of a web face and a recess (4) at the top to seat the wage block (3) after mounting of steel sample. The lower part (15) of T shaped steel block (1) is inserted on a tool holder (5) of the impact testing machine. The wage block (3) is provided with an inside threaded hole (6) at the bottom surface.
As shown in Fig - 3, an end steel sheet sample (7) having a screw (8) inserted at an inside threaded hole (2) of the web face of the T shaped steel block (1), and a middle part (9) of the sample (7) rests on the top surface of the T shaped steel block (1), and a second end of the steel sample (7) rests on an inclined plane (10) of the wage block (3). At the bottom face of the wage block (3), the sample (7) is fastened by a screw (11) inserted in an inside threaded hole (6) at the bottom surface of wage block (3).

As shown in fig 4, the device (1,3) is mounted with the sample (7) and placed on a tool holder (5) of the impact machine. The lower part (15) of 'the T' shaped steel block (1) is fastened between at least two jaws (12,5). A first jaw (12) of the tool holder (5) constitutes a fixed rectangular block end, and a second jaw (5) constitutes a movable wage block attached to a lever Arm (13). The gap between the two jaws (12,5) is increased during upward movement of the movable jaw (5) and decreases on downward movement. A hammer or pendulum (14) drops from a fixed height which hits the wage block (3) and the sample experiences an impact tensile load and falls from the notched region. The notch is placed at the parent metal, on weld or on HAZ (Heat affected zone), depending upon the zone of interest. The total energy absorbed in the test is recorded from a dial gauge provided on the machine. Actual energy absorbed by the specimen is determined from the value indicated by the dial gauge by subtracting the energy absorbed by the wage block (3) when no sample is attached to it.

WE CLAIM:
1. A detachably attachable device in a standard impact machine to hold and test plane or welded steel sheet material of thickness between 1 mm to 5mm, the machine having at least two jaws, a hammer or pendulum, a tool holder, and a dial gauge, the device comprising:
- a shaped steel block member (1) having an inside threaded hole (2) disposed at an one sided web face and a recess (4) configured at the top of surface of the shaped block (1), a lower part (15) of the block (1) holding a testing sample is enabled for insertion in the holding means of the machine;
- a right angle shaped wage block (3) having an inside threaded hole (6) configured at the bottom surface of the wage block (3); and - at least two screws (8,11) for fastening the specimen (7), wherein the first screw (8) is fixed with the block (1) and the second screw (11) is fastened with the wage block (3).

2. The device as claimed in claim 1, wherein one end of the steel sheet sample (7) is pinned by the first screw (8) with the shaped steel block (1) and the free end of the sample (7) is pinned by the second screw (11) with the wedge block (3) which rests on the top surface of the shaped steel block (1).
3. The device as claimed in claim 2, wherein the lower part (15) of the shaped block (1) after mounting with the specimen (7), is placed in the tool holding means (5) of the impact testing machine for testing.
4. The device as claimed in claim 1, wherein the shaped block (1) constitutes a right angle shaped wage block (3) and the screws (8,11) are made of steel material.
5. A process of impact testing of plane or welded steel sheet material (7) of thickness between 1 mm to 5mm in a standard impact testing machine having a detachably attached device, the process comprising the steps of:

- making a notch on the testing specimen (7) at desire location;
- fixing a first end of the specimen (7) with a shaped block (1) by atleast one first screw (8);

- fixing a second end of the specimen (7) with a wage
block (3) by atleast one second screw (II), the second end of
the specimen (7) being placed on an inclined plane of the wage
block (3),the wage block (3) disposed on the top surface of the shaped block
(1);
- placing a lower part (15) of the sample (7) at the shaped block (1) into
holding means (5,2) of the impact machine;
- allowing a hammer (14) of the impact machine to free fall and to hit the wage block (3) which imparts an impact tensile load causing a breakage of the specimen (7) from the notch region; and
- recording the total absorbed energy from a dial gauge of the machine.

6. The process as claimed in claim 5, wherein the actual energy absorbed by the specimen (7) is measured from the dial gauge reading by subtracting the energy absorbed by the wage block (3) when no sample is attached to it.
7. A detachably attachable device in a standard impact machine to hold and test plane or welded steel sheet material of thickness between 1mm to 5mm, as substantially described and illustrated herein with reference to the accompanying drawings.

8. A process of impact testing of plane or welded steel sheet material of thickness between 1mm to 5mm in a standard impact machine having a detachably attaching device as substantially described and illustrated herein with reference to the accompanying drawings.

ABSTRACT

TITLE: " A DETACHABLY ATTACHABLE DEVICE AND A PROCESS OF IMPACT TESTING OF STEEL SHEET MATERIAL IN STANDARD TESTING MACHINES"
The invention relates to a detachably attachable device in a standard impact machine to hold and test plane or welded steel sheet material of thickness between 1 mm to 5mm, the machine having at least two jaws, a hammer or pendulum, a tool holder, and a dial gauge, the device comprising a shaped steel block member (1) having an inside threaded hole (2) disposed at an one sided web face and a recess (4) configured at the top of surface of the shaped block (1), a lower part (15) of the block (1) holding a testing sample is enabled for insertion in the holding means of the machine; a right angle shaped wage block (3) having an inside threaded hole (6) configured at the bottom surface of the wage block (3); and at least two screws (8,11) for fastening the specimen (7), wherein the first screw (8) is fixed with the block (1) and the second screw (11) is fastened with the wage block (3).