A New Drop Weight Impact Machine For
Studying The Fracture Behaviour Of
Structural Concrete
Author(s)
X. X. Zhang, G. Ruiz & R. C. Yu
Abstract
This paper describes the main characteristics of a new drop weight impact
machine that has been specifically designed for studying the dynamic mechanical
behaviour of structural concrete samples. Such equipment has been used to
generate simple and measurable fracture processes under moderate to fast
loading rates, as opposed to blast chambers, which produce complicated crack
patterns that are difficult to analyze. The machine consists of two main parts, the
mechanical structure and the data acquisition system. The former is just a
hammer, guided by two robust columns, which can impact the specimen with
energy up to 7860 J. The latter consists of piezoelectric force sensors,
accelerometers and an optical fibre photoelectric sensor plus oscilloscopes and
signal conditioners. The paper also presents the results of some preliminary tests
that show the sensitivity of the work of fracture to the loading rate.
Keywords: drop weight impact machine, concrete, work of fracture.
1 Introduction
The response of concrete to dynamic loading is of interest in a variety of civilian
and military applications. For example, the protective shells of nuclear power
plants are expected to survive the impact loading of an incoming missile or other
sources; airport runways must withstand repeated dynamic loads due to aircraft
take off and landing; dynamic loading on concrete structures or buildings arising
from natural hazards (such as tornadoes, earthquakes and ocean waves) and
Keywords
drop weight impact machine, concrete, work of fracture.
Related Book
Other papers in this volume
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