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Equipments and experimental procedures:

  • Strain measurements using non-contacting laser speckle strain sensors based on digital laser speckle technique (correlation technique). Available are different detector types (area CCD`s and line scan CCD`s) for larger sample dimensions (up to 40 mm in strain direction), and point sensors for local strain measurements. Measurement rates down to 10 ms, we achieve displacement resolution of 100 nm.

  • Micro-tensile testing machines for small samples

  • Equipment for thermal strain measurements of microsystems in the temperature range RT up to 300 degrees for determination of Coefficient of Thermal Expansion. Every strain value is determined at thermal equilibrium, measurements under argon atmosphere are possible.  

  • 20 kHz resonance system allows studying fatigue life and fatigue crack growth processes (especially for free-standing thin metallic foils and microwires)

  • Servohydraulic fatigue testing machine

  • Light microscopy, Scanning Electron Microscopy, Electron Channeling Contrast Technique with SEM

Microtensile machines

 

Equipped with LSE for determination of material properties in RT and   as function of temperature up to 300°C.

Load cells:  1N, 10N, 50N, 100N and 500N

  • Stress-strain curves

  • Young´s moduli

  • Elasto-plastic response

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Laser speckle correlation extensometers

 

Suitable for thermal and mechanical strain of small scaled structures under real life conditions.

 

Advantages of LSE:

  • Non-contacting

  • No markings

  • No surface preparation

  • Suitable for low  and high temperatures    (up to 800°C)

  • Laser diode power: 5 – 15 mW

  • Strain resolution: 1x10-5

  • Displacement resolution: 0,1 µm

  • Gauge length: : 5mm and more

  • Measuring rate: : max. 40 Hz

Servo hydraulic fatigue testing machine type Schimadzu adapted for low cycle fatigue testing of thin specimens

  • Cyclic stress strain curves

  • S-N curves

 

            

 

               

 

 

 

 

 

 

 

 

Ultrasonic resonance fatigue testing system for high cycle fatigue:

  • S-N curves

  • Crack growth curves

  • Threshold values

Schematic set-up for fatigue testing of thin structures

Experimental set-up for high cycle fatigue testing

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