From Charpy to Present Impact Testing contains 52 peer-reviewed
papers selected from those presented at the Charpy Centenary
Conference held in Poitiers, France, 2-5 October 2001.
The name of Charpy remains associated with impact testing on
notched specimens. At a time when many steam engines exploded,
engineers were preoccupied with studying the resistance of steels
to impact loading.
The Charpy test has provided invaluable indications on the impact
properties of materials. It revealed the brittle ductile transition
of ferritic steels.
The Charpy test is able to provide more quantitative results by
instrumenting the striker, which allows the evolution of the
applied load during the impact to be determined. The Charpy test is
of great importance to evaluate the embrittlement of steels by
irradiation in nuclear reactors. Progress in computer programming
has allowed for a computer model of the test to be developed; a
difficult task in view of its dynamic, three dimensional, adiabatic
nature. Together with precise observations of the processes of
fracture, this opens the possibility of transferring quantitatively
the results of Charpy tests to real components. This test has also
been extended to materials other than steels, and is also
frequently used to test polymeric materials.
Thus the Charpy test is a tool of great importance and is still at
the root of a number of investigations; this is the reason why it
was felt that the centenary of the Charpy test had to be
celebrated. The Societe Francaise de Metallurgie et de Materiaux
decided to organise an international conference which was put under
the auspices of the European Society for the Integrity of
Structures (ESIS).
This Charpy Centenary Conference (CCC 2001) was held in Poitiers,
at Futuroscope in October 2001. More than 150 participants from 17
countries took part in the discussions and about one hundred
presentations were given. An exhibition of equipment showed, not
only present day testing machines, but also one of the first Charpy
pendulums, brought all the way from Imperial College in London.
From Charpy to Present Impact Testing puts together a number of
significant contributions. They are classified into 6 headings:
Keynote lectures,
Micromechanisms,
Polymers,
Testing procedures,
Applications,
Modelling.
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