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M Series - Strain Gauges Providing High Resistance to Alternating Loads

M series strain gauges have been specially developed for high resistance to alternating loads at increased strain levels and high temperatures up to 300 °C. M series strain gauges are foil strain gauges with measuring grids made of a special nickel-chromium alloy. HBM offers this special strain gauge with various geometries, measuring grid lengths, temperature response matching and with resistors of 350 ohm and 1.000 ohm.

New materials offering high strength such as fiber composites pose a major challenge for strain gauges used for measurements specifically when pushing components to theirmechanical limit of performance. Situations may arise where a strain gauge subjected to alternating loads at increased load levels is weakened and fails earlier than the component under test. The M series has been specially developed for high resistance to alternating loads and allows for testing of materials featuring high strength.

LM1
Linear strain gauge with one measuring grid for strain measurements in one direction.

TM1

T rosette with two measuring grids arranged at an angle of 90° to each other. For measuring tensile and compressive stress.

TM9

Stacked T rosette with two measuring grids arranged at an angle of 90° to each other. For measuring tensile and compressive stress.

XM4

V-shaped strain gauge with two measuring grids arranged at an angle of ±45°. For determining torsion and shear stress.

RM8

Rectangular rosette with three measuring grids arranged at angles of 0°/45°/90°. Biaxial stress state with unknown principal stress directions.

RM9

Stacked rosette with three measuring grids arranged at angles of 0°/45°/90°. Biaxial stress state with unknown principal stress directions.

All strain gauge types mentioned above are available with different measuring grid lengths:

  • 1.5 mm: where space is a constraint or when highly selective measurement results are required
  • 3 mm: for inhomogeneous materials and where space is a requirement or not
  • 6 mm: for inhomogeneous materials and where space is not a requirement

The right measuring grid length: The measuring grid length depends on the aim of measurement, since the result of a measurement with strain gauges will be determined as the average of strains. In general, measuring grid lengths of 3 to 6 mm generates a better result.

Long measuring grids are recommended where there is an inhomogeneous material such as concrete or wood. A long strain gauge will bridge the inhomogeneity of the work piece and return the strain underneath the measuring grid as the measurement result.

Short measuring grids are suitable for detecting a local strain state. Therefore, they aresuitable for determining strain gradients (strain gauge chains), the maximum point of notch stresses and similar stresses.

Do you have special requirements that are not adequately covered by any of the strain gauges in our standard program? Are you looking for an equivalent strain gauge for the product you are currently using? Have you designed your own strain gauge? Contact us, and we will produce customized strain gauges according to your requirements in quantities of 20 packages and up.

 
 
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