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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.

principal strains and stresses

 

Three-Element Delta Rosette Strain Gage Equations and Calculator

Preview: Three-Element Delta Rosette Strain Gage Calculator

Three-Element Rectangular Rosette

Maximum Principal Strain

Maximum Principal Strain
Minimum Principal Strain

Minimum Principal Strain

Principal Stresses:

Maximum Principal Stress

Maximum Principal Stress
Minimum Principal Stress

Minimum Principal Stress

Treating the tan-1 as a single-valued function, the angle counterclockwise from gage A to the axis containing εp1 or σp1 is given by:

Direction of Principal angle from εa

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)
θp = Angle (degrees)

Reference:

Roarks Formulas for Stress and Strain
KYOWA Electronic Instruments

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