Strain gauge measurements

Strain gauge measurement is used in the study of construction in the following aspects:

1.  Evaluation of durability parameters of construction (for instance in railway, automotive and machine industry)

What is measured during the test are strain values in the measurement points (where the strain gages are installed on the structure). In a lot of cases these measurement points are determined by numerical analysis, which indicates the most intense stress places for specific loads cases.

The stress at these points is determined based on measured strain values and knowledge of material constant - Youngs module.

This type of research allows to:

• establish the safety and durability of studied objects,
• validation of the results obtained by FEM analysis - stress of the design obtained by computer simulation should be verified by comparing with the values derived from experimental studies.

Analysis of the measurement data can be used to:           

• design modifications to enhance safety
• design optimization - minimize weight while maintaining safety and reliability criteria
• fatigue analysis of construction

Determination of measurement points using numerical analysis

Measuring system tests

Exemplary results of strain

2.  Determination of loads (forces, bending and torsion torque) of the structure in operational conditions.

The results of tests serve as an input information to determine the boundary conditions in numerical analysis (finite element method).

Strain gauge installation on a train rail

Strain gauge installation to determine forces in the suspension elements

Sample of strain results

Sample of strain results

3.   Telemetry measurements of deformations and vibrations.

KMT Telemetry system for wireless measurements on rotating parts of vehicles and machine (e.g., railway wheel, mechanisms on the axis, the torques on the shafts).

Telemetry system for strain measurement in the SUW 2000 mechanism

Sample of strain results

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