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Three-Element Delta Rosette Strain Gage Equations and Calculator

Strength of Materials
Structural Deflections and Stress Equations and Calculator

Three-Element Delta Rosette Strain Gage Equations and Calculator

The principal strains and stresses are given relative to the xy coordinate axes as shown below.

 

Preview: Three-Element Delta Rosette Strain Gage Calculator

Three-Element Rectangular Rosette

Maximum Principal Strain

Minimum Principal Strain

Principal Stresses:

Maximum Principal Stress

Minimum Principal Stress

Treating the tan^-1 as a single-valued function, the angle counterclockwise from gage A to the axis containing ε_p1 or σ_p1 is given by:

Where:

E = Young's Modulus (N/m², lbs/in²)
ν = Poissons Ratio
ε = strain (μm/m, μin/in) µ
σ = Stress (N/m², lbs/in²)
θ_p = Angle (degrees)

Reference:

Roarks Formulas for Stress and Strain
KYOWA Electronic Instruments