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Chapter 11 Notes - Chapter 11 Strain Measurement Material...

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1 Chapter 11 Strain Measurement Material from Theory and Design for Mechanical Measurements; Figliola, Third Edition Stress Analysis Stress Analysis is accomplished by measuring deformation of part under load and inferring the existing state of stress from measured deflection. Normal Stress: σ a = F N /A c ; F N =Tension Force, A c =Area, σ a =axial strain Stress Analysis Ratio of change in length of the rod to the original length is axial strain: ε a = δ L/L ; ε a =average strain, δ L=change in length, L=original unloaded length Lateral strain: ε L = δ d/d Strain is a small quantity, usually reported in units of 10 -6 in/in or 10 -6 m/m.
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