Various experiments are carried out at our department to determine material properties (such as the modulus of elasticity). The following testing machines are available for carrying out tensile, compression and torsion tests:

• Schenck Hydropuls system POZ 0566 with characteristic values: 25 kN (load) / 20 Hz
• Schenck Hydropuls system PEZ 4125 with characteristic values: 63 kN (tension/compression) / 500 Nm (torsion) / 20 Hz
• Schenck SM-1 vibrating table system with characteristic values: max. mass: 250 kg / 10 Hz
• Hegewald & Peschke MPT GmbH Universal testing machine inspekt Duo 5kN - size L
  • Load cell 2kN
  • Test area height 1605 mm
  • Test speed 1.5 µm/min to 1200 mm/min

• Digital microscope VHX-900F (Keyence)

  The digital microscope of the VHX-900F series operates in full-frame mode and can image a range of 1600(H)x1200(V) pixels at a frame rate of 50 frames/s. Thanks to the freely adjustable viewing system, the same position can be viewed from different angles. In addition, the microscope has a depth-of-field composition function and 3D display function, enabling 3D viewing of surfaces from different angles by depth composition. The microscope also offers the option of precise measurements during and after live recording, whereby the data can also be output in other programs such as Excel or a CAD program.

   

  Features:

  • Freely adjustable viewing system (motorized Z-axis stage) VHX-S90F
  • Universal zoom lens (20-200x) VHX-Z20T
  • Universal zoom lens (100-1000x) VH-Z100R/W/T

• Color 3D Laser Microscope VK-8710 (Keyence)

  A laser scanning microscope is used for contactless profile, roughness and layer thickness measurements with high resolution. The KEYENCE laser scanning microscope uses two light sources for this purpose: Laser light and white light. The laser is used to scan the surface to be examined so that image frames and height measurements are digitized. By using white light, the color of the surface can be determined.Features:
  

  • Nikon zoom lens (10-100x)

A split Hopkinson bar test is the most common experiment for dynamic material characterization, with distortion rates ranging from 500 ^s-1 to^{104 s-1}. A uniform, one-dimensional stress load on the material to be tested can be achieved with this method. This is achieved with an almost constant distortion rate. Furthermore, different dynamic loads such as tension, compression and torsion, which can vary depending on the application and design, can also be applied. The specimen stress and distortion is determined by elastic elements arranged in series with the specimen. The following are available:

• Small type: max. energy: approx. 70 Ws
  • Projectile length: 100-300 mm
  • Incident bar length: 1800 mm
  • Transmission bar length: 1800 mm
  • Material: Aluminum, steel or PMMA
  • Plain bearing guides
• Large type: max. energy: approx. 100 000 Ws
  • Bar Ø: 50 mm
  • Projectile Ø: 48 mm
  • Projectile length: 100 mm (mass: approx. 1.42 kg)
  • Length incident bar: 3260 mm
  • Transmission bar length: 3288 mm
  • Air-bearing rod guides

• Strain gauge measuring strips available