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Strain gauge measurement

Techno Fysica provides strain and stress measurement by means of strain gauges. This is mostly used for design checks but obviously it is also a part of our monitoring and troubleshooting activities. Here, too, a combination is made with finite element calculations.

The measurement can be done on parts such as machinery segments, for example frames and shafts, but also on complete structures like ships, bridges and so on.

The goal of this measurement can vary. Static strain gauge measurements can show the extent and distribution of material stress in constructions or construction parts. This is especially important if it is unknown how high the load is or if checks need to be done to find out whether the load stays within previously defined limits.

In dynamic applications, fatigue aspects are usually the issue, caused by a combination of activities. Initially a finite element calculation in order to define load concentrations, followed by measuring, then a further fatigue analysis based on a measured load profile. Post-processing such as the ‘rainflow count’ or a simple classification of peak load are also possible. For this type of application we possess multi-channel system with a bandwidth up to approximately 1 kHz.

As a special application, strain gauges can also be applied to turning shafts, which transmit a signal to the registration equipment by means of a telemetric system. This can, for example, be done for torque & power, torsional vibrations, thrust or bending. These signals, too, can be registered in a parallel with other variables.

  • Examples of applications are:
  • Prototype testing/research
  • Monitoring of actually occurring loads during use
  • Torque, strain/pressure and torsional vibrations
  • Bending moment of a shaft (alignment) or even of a complete ship (load/sagging conditions)
  • Force measurement (construction as a ‘load cell’)
  • Troubleshooting in cases of unexpectedly failing constructions or excessive wear that may be caused by overloading

Given our primary working area this kind of measurement obviously is possible in a maritime environment with experience above, on and far beneath the water line.