Strain gauges having polyester resin backing are mainly used for measurement on concrete, mortar or rock
. There is also Mold strain gauges
exclusively designed for measuring interior strain in concrete or mortar under loading test. To prevent the lowered insulation resistance caused by the moisture penetration through the concrete surface, a thin stainless steel backing stain gauge is recommended with integral lead wire and moisture proof coating over the gauge.
TML strain gauges are widely used for physical force measurements in mechanical, marine, aircraft and civil engineering as well as the fields of architecture, automotive and medical science.
TML strain gauges are field-proven products that meet the highest standards of quality, accuracy and performance in the industry. Satisfy the requirements of customers ranging from research facilities to civil engineering as well as construction companies. Meanwhile, a wide variety of strain measurement accessories to complete strain gauge applications is available for selection.
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When strain is generated in a test specimen and a strain gauge is tightly bonded, the strain is relayed via the gauge base (electrical insulation backing material) to the etched metallic resistance foilpattern causing mechanical extension or shortening. As a result, alloy foil experiencesa variation in electrical resistance. This resistance of the foil change is in a defined way proportionally to the strain.
Strain measurement principle formula:
[Extension or Shortening] Resistance change due to strain (Ω, ohm)
Original resistance of strain gage (Ω, ohm)
Proportional constant also called Gauge Factor (shown on product package)
Strain causing the resistance change (strain is measured)
The Gauge FactorK
differs from metallic materials.
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