Impact Compression And Tensile Testing By
Means Of A Charpy Pendulum
Author(s)
V. Mentl & J. Dzugan
Abstract
Mathematical modelling and virtual testing of components and structures
represent a useful and economical tool for design and safety assessment. The
so called basic mechanical properties which can be found in material standards
are not relevant in cases where the real service conditions differ from those
applied during testing. Thus e.g. mechanical behaviour at higher strain rates can
be interesting for the car components when the simulation of crash situations is
used during structure development. The dynamic compression tests are usually
performed by means of drop towers, dynamic tensile tests by means of high
speed hydraulic testing machines or the Hopkinson bar method. At the
Mechanical Testing Laboratory of the SKODA Research Inst. in Pilsen, Czech
Republic, an instrumentation of a Charpy pendulum testing machine was realised
in order for it to be possible to perform dynamic compression and tensile tests. A
new striking tup and load measurement system were designed and calibrated. At
the same time, new software was developed which makes it possible to evaluate
the test force-deformation record. The correctness of the instrumentation and
software was verified by comparison of measured and evaluated values of
energies and deformations. A very good agreement was obtained. An
international round-robin within the framework of the ESIS TC5-Subcommittee
on \“Mechanical testing at intermediate strain rates” is realised at present.
1 Impact tensile testing
For the purposes of instrumented tensile testing, the Charpy pendulum was
modified so that the force during the test could be measured. For this purpose a
special load cell element was designed on the basis of tensometric measurement,
Keywords
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