Zug-, Druck und Biegefestigkeit

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Determination of mechanical properties by using universal testing facilities

Structural components are exposed to mechanical stress, which requires a comprehensive characterization of the mechanical properties. Thus components can be tailored for their intended use. We can determine the following important key figures for the designer.

  • stiffness, strength, toughness
  • damage tolerance against cracks, notches and material defects
  • mechanical behaviour at different temperatures
  • relaxation, creep, hysteresis

All tests are performed on a calibrated universal testing device in accordance with accepted standards (DIN, ASTM, EN and ISO). The force-displacement diagrams are recorded using a PC and analyzed with software specially developed for this purpose.

Temperature ranges
for tensile tests -150 °C to +1000 °C, at -196 °C (LN2) and at -269°C (LHe)
for compression tests -150 °C to +800 °C, at -196 °C (LN2) and at -269°C (LHe)
for bending tests -150 °C to +1100 °C, at -196 °C (LN2) and at -269°C (LHe)
fracture mechanics -150 °C to +1100 °C, at -196 °C (LN2) and at -269°C (LHe)
Quasistatic Material Testing_1Tensile and compression tests
  • Determination of mechanical parameters
  • Investigation of temperature behavior
  • Force sensors for different force ranges available
  • High-resolution, non-contact extensometer in use
Bending tests
  • three-point bending tests on injection molded parts and fibre-reinforced composites
  • Interlaminar shear strength of long fiber-reinforced plastics
  • Four-point bending test of compact materials and sandwich structures

Quasistatic Material Testing_2Varying moment curve at 3-point- and 4-point-bending test
(M=bending moment, IA=span lenght, Lv=effective span)

Determination of the critical stress intensity factor

Quasistatic Material Testing_3Force-crack opening curve
Crack growth starts at fors FQ

  • characterization of damage tolerance to defects
  • determination of the E-modulus
  • by normalization to the sample geometry, material-specific parameters are provided
Interlaminar fracture toughness
  • probability of defects in fibre-reinforced plastics is higher than in homogeneous plastics
  • the criteria of linear elastic fracture mechanics are not valid for fibre-reinforced plastics
  • energy release rate characterizes the strength of the material

Quasistatic Material Testing_4