Design, Development and Testing of Drop-weight Impact Test Machine
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Date
2021-08
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Addis Ababa University
Abstract
The aim of this project is to design a drop weight impact test machine and conduct
test with the prototype. The testing of materials under dynamic conditions needs
an e cient and reliable equipment to experimentally examine and quantify the dynamic
behavior of materials under low velocity impact loads.
Drop weight impact test machine designed and modeled is vertical, double column,
simple, compact, inexpensive and easily transported to desired location. The development
process includes conceptual design phase, detailed design phase prototyping
and testing the intended testing machine. Both drop weight and height can be varied
independently. The measurement system includes piezoelectric accelerometer
connected to the drop weight and Model 485B39 digital ICP signal conditioner.
ASTM D7136/7136M standard testing method followed. The machine has a striker
of xed shape and known mass which has interchangeable 16 mm diameter hemispherical
tup, two friction less guide rod assembly to freely fall the impact assembly,
1:2 m wide-
anged drop tower which used as a main support structure, a support
bracket which attach the guide rod assembly to the drop tower and specimen xture
where standard
at rectangular test specimen (150 mm 100 mm) sits on. It
has maximum drop height of 0.62 m, standard mass of 5.5 Kg with increment of
0.45 and 0.5 Kg, and maximum impact energy and velocity of 33.5 J and 3.49 m/s
respectively.
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Description
Keywords
Drop-weight Impact, Design, Testing