Strain Rosette-2013-Spring-slides

Strain strain gage rosettes a b basic rosette types

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ively, from the first grid. Strain Strain Gage Rosettes a b Basic rosette types, classified by grid orientation: (a) tee; (b) 45º-rectangular; (c) 60º delta c Strain Strain Gage Rosettes Rosettes are manufactured from different combinations of grid. Geometrically different, but functionally equivalent configurations of rectangular and delta rosettes. Principal Principal Strains and Directions from Rosette Measurements The equations for calculating principal strains from three rosette strain measurements are derived from what is known as a “straintransformation” relationship. Principal Principal Strains and Directions from Rosette Measurements By successively substituting into Equation (1) the angles for the three grid directions, the strain sensed by each grid can be expressed as follows: Principal Principal Strains and Directions from Rosette Measurements By solving Equations (2) simultaneously for the unknown quantities εP, εQ, and θ, the principal strains and angle can be expressed in terms of the three measured strains. Angle θ represents the acute angle from the principal axis to the reference grid of the rosette Principal Principal Strains and Directions from Rosette Measurements Hooke’s law can be used to convert the principal strains into principal stresses After applying Hooke’s law: Questions Questions...
View Full Document

This note was uploaded on 02/02/2014 for the course CE 231 taught by Professor Jasonweiss during the Fall '08 term at Purdue University-West Lafayette.

Ask a homework question - tutors are online