LI66: Strain Gauge for Embedded Applications such as Composite Materials

The increased use of fiber composites and the systematic optimization of components presuppose a precise knowledge of the load situation. In many applications, sensor integration is the only way to meet the demand for modern lightweight structures with regard to production control, load monitoring, damage analysis and generating control signal. The LI66 strain gauge is embedded directly in the structure during the fiber composite production process. This allows measurements in places that are no longer accessible after production.

Practical connection of the strain gauge after production

The most striking feature of the LI66 SG are the two 15 mm vertically attached contact pins (d=0.6mm) for contacting the strain gauge embedded in the material. The measuring leads only need to be connected to the gold-plated pins outside the structure, which makes the handling easier. When the strain gauge is integrated, it is cemented to the material by the matrix resin. The point of the pin concept is that it eliminates the need to embed the measuring leads in the fiber composite as well.

Further information on using the LI66 may be found in our technical article "Structural Integration of Strain Gauges".

High level of accuracy

  • Sufficently sensitive to determine cracks in the resin and delamination in the fiber composite
  • Integrated strain relief

High level of measurement accuracy comproved by damage analysis

Easy handling

  • Comprises two vertically attached contact gold-plated pins for contact after being embedded in the material (outside the structure)

Handling easier after manufacture

Special layout

  • Measuring grid outside the fibers running round the pin
  • No forces on the pin transferred to the measuring grid

No need to embed the measuring leads in the fiber composite

LI66 Technical Features

 

Ordering
number

Nominal (rated)
resistance

Dimensions [mm/inch]

Measuring grid

Carrier

Ω

a

mm/inch

b

mm/inch

c

mm/inch

d

mm/inch

Vmax

  

LI66-10/350

350

10
0.039

3.8
0.149

22
0.866

10
0.393

2.5


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