Directional Analysis
Sensor assembly containing three independent strain gauges oriented at specific angles to determine the complete state of strain on a surface. A triaxial rosette provides the data necessary to calculate principal strains and the direction of the maximum stress. It is a fundamental tool for evaluating the mechanical health of complex electronic assemblies.
Angular Configuration
Common designs use either a 45-degree rectangular or a 60-degree delta arrangement. Each element in the triaxial rosette produces a voltage proportional to the strain along its specific axis. Using these three values, an analyst can solve the equations of elasticity to find the orientation of the stress field.
Calibration Factor
Sensitivity of each individual element is matched at the factory to ensure uniform performance across the set. If one gauge in the triaxial rosette has a different gauge factor than the others, the resulting principal strain calculation will be skewed. Lead wire compensation is used to maintain this balance when the sensors are located far from the acquisition hardware.
Specialized instrumentation handles the bridge completion and excitation requirements for all three channels simultaneously.
Software Processing
Software algorithms convert the raw microstrain readings into meaningful mechanical descriptors. The triaxial rosette output is often compared against the yield strength of the materials in the assembly. This comparison determines if the applied loads during shipping or operation are likely to cause permanent deformation.
