Dynamic mechanical multi-talent for visco-elastic properties

DMA 242 C – Analisador Dinâmico Mecânico

 

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DMA 242 C - Technical Specifications (subject to change)

• Deformation modes:
  3-point-bending
  single-/dual cantilever bending
  shearing
  compression/penetration
  tension

• Measurement modes:
  TMA-modes
  creep/relaxation (option)
  stress/strain sweep (option)

• Temperature range: -170°C ... 600°C

• Heating and cooling rates: 0.01 K/min ... 20 K/min

• Cooling time: 10 min (20°C ... -150°C)

• Frequency range: 0.01 Hz ... 100 Hz

• Controlled force range: max. 8 N static and max. +/- 8 N dynamic

• Controlled strain amplitude ranges: max. +/-240 µm

• Modulus range (E’): 10-3 MPa ... 106 MPa

• Patented displacement sensor (DE 4309530C2) with new automatic ranging feature: always guarantees the highest resolution of the deformation amplitude up to 0.5 nm

• Damping range(tanδ): 0,00006 ... 10

• Atmospheres: inert, oxidizing, static, dynamic

• Single channel gas flow meter (option)

• Thermostatic control (option)

• Immersion tests (option)

Schematic of DMA 242 C

Three-point Bending
The sample is supported on two edges, while the cutting end of the push rod applies a load to the sample from above. The spacing between the two edges is in accordance with DIN 53457. Four different bending lengths between 10 and 50 mm are available. This deformation mode is ideal for materials with a high storage modulus such as filled or reinforced thermoplastics and thermosets (composites) or metals and alloys.

Dual Cantilever Bending
The ends of the sample are tightly clamped. This arrangement is especially suitable for samples of mid modulus range (rubber and thermoplastics). Holders for three different bending lengths between 2 and 32 mm are availabe. By leaving one end of the sample free, measurements can be made in the single cantilever bending mode as well.

Compression
The sample (rubber, foams, biopolymers, pasty materials, etc.) is placed on a flat surface in the sample holder and pressure is applied from above with the plate-shaped end of the push rod. Different diameters up to 30 mm are availabe. By using a ceramic disk and a push rod of fused silica, a small temperature gradient can be achieved (especially for foams and rubber). If the end of the push rod is pointed rather than flat, the term is penetration. For example, this type of stressing is suitable for the investigation of coatings.

Linear Shearing
Two identical samples are pressured or glued in sandwich geometry between the flat surfaces of the sample holder and the push rod. The load is applied via the platelike extension of the push rod. Two types of sample holders are especially suited for soft materials such as rubber and adhesives.

Tension
The tension mode is preferable for the measurement of films and fibers or thin rubber samples. The lower end of the sample is held in place, wheras the upper end is clamped to the oscillating push rod.

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