Strain gauge measurements and analysis of structures
Use of strain gauges may tell you whether your structure is exposed to loads that are so critical that failure is bound to occur. Let us assist you in strain gauge measuring as well as gaining the optimal knowledge from the measurements.
The advantage of strain gauge measuring
Strain gauge measuring provides you with certainty about the actual stress in the structure. This stress can be compared to the calculations upon which the structural design is based. Thus, you are certain that the calculations are correct.
If this is not the case, we will assist you in assessing whether the correct calculation preconditions have been applied, or whether you have to revise your calculation model. Often many factors and preconditions are hard to design in the calculations.
What is a strain gauge, and how to use it?
The size of structures have grown over time and have become more complicated to analyse. The technological development has provided the opportunity to analyse stresses in structures by advanced finite element software. Despite the advanced analysis methods, the results seldom paint a correct picture.
The most common type of strain gauge consists, in principle, of a resistance wire fixed to the structure. When you load it, the resistance changes, and by measuring this change you get an impression of the structure’s state of strain and stress.
Most often strain gauges are glued to a ground area. From the strain gauges, you then draw wires to a data logger collecting data, and subsequently you store the data in a computer. The strain gauges monitor and log the actual strains in the surface in the selected critical positions. Based on the measured strains, you may calculate the stresses where the strain gauges have been fitted.
- Offshore structures
- Wind turbines
- Machines and machine components, also rotating parts and bolts
- Pressure equipment
- Concrete structures.
This way you can monitor the actual strains and stresses, or download saved data for analysis on a regular basis.
You can use the results to continuously monitoring the state of the structure on which the strain gauges are fitted, and thus be on top of the situation to prevent a critical failure.
Full-scale testing documents quality
Loads are measured on wind turbines on their knees
Structural health monitoring system for offshore wind turbines
Our monitoring system for wind turbine foundations gives you early warning of possible flaws.
Status assessment and inspection increase safety
If failure is not acceptable, it is necessary to perform a status assessments at suitable intervals
Engineering critical assessment of welded structures (ECA)
Is it safe to keep using a structure with flaws, without any risk of failure?