Impact Performance of Concrete Beams
There is increasing demand for testing concrete beams in an impact 3-point bend configuration. We recommend a CEAST 9350 or CEAST 9340 for this testing depending on the maximum energy required. We developed a custom fixture with 300mm span, dedicated tup insert and used the DAS 64k and VisualIMPACT software for data acquisition.
Samples were 400mm x 100mm x 100mm and tested at up to 4.65m/s. The velocity could be increased if required. Tests showed the failure modes and were designed to simulate larger structures which would require much more energy to test than can be achieved in the lab. The types of results compared were total energy absorbed, maximum load, energy to failure and displacement to failure.
The 9300 series is well suited for helping customers determine the performance characteristics of their materials when subjected to an impact event. The information gathered by doing instrumented impact testing can be used to provide the customer with a data baseline whereby they can determine how changes made in the mix of raw materials will perform in real life situations. A broader range of testing could be accomplished with the inclusion of an environmental chamber to study impact characteristics at different temperatures as well as using different fixtures and inserts to simulate other unsupported spans and impact events.
Impact resistance is one of the most important properties for component designers to consider, as well as the most difficult to quantify. Impact resistance is a critical measure of service life and more importantly these days, it involves the perplexing problem of product safety and liability. With the combined experience of Dynatup® and CEAST, Instron® has more than 80 years experience in designing impact testing systems to simulate real-life impact conditions.
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The new CEAST DAS 64K is a state-of-the-art Data Acquisition System designed for impact testing instruments. Compatible with the full range of CEAST impact testing systems, including pendulum type machines (CEAST 9000 Series) and drop towers (CEAST 9300 Series), it’s the key for instrumented impact testing. The DAS 64K also enables the data collection from instrumented tups or hammers on older models and non-CEAST impact machines.
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