DIN 53445:1986-08

1 Scope and field of application
2 Concepts
      2.1 Shear modulus
      2.2 Logarithmic decrement of damping
3 Principle
4 Apparatus
      4.1 Torsion pendulum
      4.2 Controlled-temperature chamber
      4.3 Thickness measuring device
      4.4 Width measuring device
      4.5 Length measuring device
5 Specimens
      5.1 Preparation
      5.2 Shape and dimensions
      5.3 Number
      5.4 Conditioning
6 Procedure
      6.1 Measurement of specimen dimensions
      6.2 Clamping of specimen
      6.3 Conditioning of specimens
      6.4 Start of oscillation
7 Evaluation
      7.1 Calculation of shear modulus
      7.2 Calculation of logarithmic decrement
      7.3 Calculation of shear
8 Test report
Standards referred to
Other relevant standards and documents
Explanatory notes

Specifies methods of testing the visco-elastic behaviour of polymer materials as a function of the temperature at low frequencies (in the range of approximately 0,1 to 10 Hz) and at low strain with the aid of a torsional pendulum. The methods serve to establish the temperature ranges in which the material shows an elastic behaviour like steel or rubber, or is viscous and in which it passes from one state to the other (transition range). This make it possible to classify polymer materials according to their mechanical behaviour (see DIN 7724) as a function of the temperature.