High Precision Full Bridge Strain Gauge

The size should be selected based on the specimen material, stress distribution, and bonding area. For uniform stress distribution and a large bonding area, a strain gauge with a grid length of 3–6mm is recommended. For stress concentration or a smaller bonding area, a strain gauge with a grid length of ≤1mm is recommended. Generally speaking, a larger grid length improves bonding and heat dissipation, resulting in more stable measurements.

Strain gages with larger grid lengths are easier to install, provide better heat dissipation, and provide more stable measurements. Strain gages with smaller grid lengths can reflect local strains, but they require more precise bonding techniques and have poorer heat dissipation. Where conditions permit, it is recommended to prioritize strain gages with larger grid lengths.

If the principal stress direction is unknown or shear strain measurement is required, a multiaxial strain gage should be used. When the principal stress direction is unknown, a triaxial strain gage (with an angle of 45°, 60°, or 120°) should be used. When measuring shear strain, a 45° biaxial strain gage should be used. If the principal stress direction is known, a uniaxial strain gage should be used.