Drop Weight Impact Testing Machine

Drop Weight Impact Test method is to drop a load in a perpendicular direction, with a tube or rails to guide it during the “unrestricted reduction”. Dimension includes 1200*1700*2400mm, and 1700*1200*2400mm. Power required is 750W, 1.85KW and so on. Maximum Drop Weight is 40, 50, 80, 150, and so on.

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Detailed Description for Drop Weight Impact Testing Machine

INTRODUCTION & WORKING : 

Drop Weight Impact Test method was to drop a weight in a vertical direction, with a tube or rails to guide it during the "free fall." Once again, with the height and weight known, impact energy can be calculated. Since the falling weight either stopped dead on the test specimen, or destroyed it completely in passing through, the only results that could be obtained were of a pass/fail nature.

When an impulse loading from blast wave is delivered to a structure, it produces an instantaneous velocity change: momentum is acquired and the structure gains kinetic energy which is converted to strain energy while the structure deforms. The most important feature of blast resistant construction is the ability to absorb blast energy without causing catastrophic failure in the structure. Structural components must possess adequate deformation capacity under extreme overload, thereby dissipating large amounts of energy, prior to failure, i.e., to permit significant localized damage while preventing catastrophic collapse. Construction materials in blast protective structures must have ductility as well as strength.

In mechanics, an impact is a high force or shock applied over a short time period when two or more bodies collide. Such a force or acceleration usually has a greater effect than a lower force applied over a proportionally longer time period of time. The effect depends critically on the relative velocity of the bodies to one another.

At normal speeds, during a perfectly inelastic collision, an object struck by a projectile will deform, and this deformation will absorb most, or even all, of the force of the collision. Viewed from the conservation of energy perspective, the kinetic energy of the projectile is changed into heat and sound energy, as a result of the deformations and vibrations induced in the struck object.

However, these deformations and vibrations can not occur instantaneously. A high-velocity collision (an impact) does not provide sufficient time for these deformations and vibrations to occur. Thus, the struck material behaves as if it were more brittle than it is, and the majority of the applied force goes into fracturing the material.

 

Different materials can behave in quite different ways in impact when compared with static loading conditions. Ductile materials like steel tend to become more brittle at high loading rates, and spalling may occur on the reverse side to the impact if penetration doesn't occur. The way in which the kinetic energy is distributed through the section is also important in determining its response.

ADVANTAGES :

 

1.    Charpy and Izod tests, is due to the limitations that are experienced while trying to perform impact testing on composite materials.

2.    Another main advantage of using drop weight impact test over other standard tests is its ability to reproduce conditions under which real life component would be subject to impact loading.

3.    Advantage of using the drop weight impact test over pendulum impact test methods is that the specimen does not usually have to be clamped, depending on the testing arrangement.

4.    It is applicable for molded samples, molded parts, etc.

5.    It is unidirectional with no preferential direction of failure. Failures originate at the weakest point in the sample and propagate from there.

6.    Samples don't have to shatter to be considered failures. Failure can be defined by deformation, crack initiation, or complete fracture, depending on the requirements.

 

7.    Impact testing can be done for Metals & Non metals etc.


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