Fatigue Heat Build-Up testing module

Temperature increase in rubber is the principal cause of degradation and can lead to fatigue cracking.

For rubber goods (tire, belts, vibration mounts …) Heat Build Up (HBU) is part of a maker’s design specifications that have to checked and well controlled.

METRAVIB Heat Build Up module is a major ad-on to the DMA+ series to analyze accurately rubber compounds response to repeated mechanical excitation under multiple parameters and advanced testing conditions.

Features

Main specifications

  • Wave form: sinusoidal, haversine, pulse, triangle, square and customized wave forms corresponding to real excitation signal applied to the rubber goods in their daily application
  • Frequency: 0.00001Hz to 1kHz
  • Deformation: up to 12mm
  • Force: up to 2000N
  • Conditioning temperature: -150°C to 500°C

Assets

Advanced testing conditions far beyond the testing conditions recommended in traditional standards ( ISO4466, ASTM D623) are possible.

Contrarily to traditional Goodrich flexometer  which works exclusively in sinusoidal deformation, the multi harmonics control mode of the excitation wave form by MULTITEST, makes possible to apply as well sinusoidal deformation, as most waveforms, such as haversine, pulse, square or even customized wave forms corresponding to real excitation signal applied to the rubber goods in their daily application.

The large analysis ranges of the DMA+ series, in term of excitation force, displacement range, and frequency range, associated to MULTITEST software ensure to offer advanced testing conditions capabilities.

The dedicated METRAVIB Heat Build Up module specimen holder includes thermally insulated compression plates, a thermal probe measuring the surface temperate at the upper extremity of the specimen and a thermal needle probe pneumatically actioned.

The thermal probe inserted in the upper compression plate, measures the temperature at the specimen surface continuously during the fatigue test. The thermal needle probe is actioned to penetrate inside the specimen at the end of test to obtain an accurate temperature measurement at the heart of specimen without affecting the dynamic test.

Additionally DMA+ series offers many functionalities and capabilities to approach Heat Build Up analysis: tension, shear, with using various specimen geometries as double shear sandwich specimen, rubber sheet, rubber films…

Rubber sheets and films can be tested as well using an optional infrared temperature sensor for measuring the specimen surface temperature.

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