The mechanical characterization of materials (tensile, compression, fracture, bending, ...) requires a wide range of experimental techniques to determine its behavior under various types of loading (monotonic or cyclic, uniaxial or multiaxial)
and environmental conditions (temperature, humidity,
etc.).. Mechanical Testing Laboratory, Department of
Materials Science, has 14 servo-controlled mechanical
testing machines, which together with various additional
equipment and environmental chambers, can characterize
the mechanical behavior of all materials (ceramics,
composites, biomaterials, biological samples, concrete,
rocks, metals, polymers, ...) under mechanical actions,
thermal and environmental varied. The most relevant possibilities Mechanical Testing Laboratory are:
Conventional mechanical tests
under various mechanical stresses (tensile, compression,
fracture, fatigue, etc.).. Available equipment allow for uniaxial
or biaxial mechanical tests under monotonic and cyclic
loads. The different available load cells can accurately
measure forces from 1 gram to 100 tons. The laboratory also provides testing equipment for friction and wear as well as a micro-machine to perform mechanical tests in the scanning electron microscope.
The instrumentation of the tests are carried out through a wide range of conventional systems extensometry (resistive and capacitive gauges, LVDT),
and advanced. The latter include optical and laser extensometers to measure movements from outside the test chamber without contact with the probe. It also has a long focal length telescope that allows us to observe the micromechanisms of deformation and rupture on the surface of the specimen during testing.
Tests at extreme temperatures. In our laboratory have environmental chambers and ovens that allow you to perform mechanical tests between -196 ║ C and 1700 ░ C.
Impact tests. The
characterization of the mechanical properties of
materials under conditions of impact and penetration
requires a set of specific experimental techniques. The lab has two Hopkinson bars to determine the mechanical properties of materials in tension and compression at high strain rate and high temperature, as well as a free-fall machine to study the behavior at intermediate speeds solicitation. It also has a gas gun that can shoot fragments of 1.1 g to a speed of 800 m/s. The implementation of the tests performed with strain gauges and 4 high-speed CCD cameras.
Tests in controlled environments.
The mechanical behavior of materials depends on
the environment in which they find, and environmental
interaction with the mechanical can multiply the effects
of both. The Department of Materials Science has a wide
range of environmental chambers that allow for
mechanical tests under different environmental
conditions: Ultra high vacuum (up 10.8 tor), small gas
partial pressures (measured with a quadrupole mass
spectrometer) , corrosive liquids, saline (for the study
of biological samples), moisture and temperature
controlled, and so on.