Lecture 14 - Stress Determination Flashcards
Give a summary of the quantities measured and the stress relationships for stress determination techniques
What are some general ways in which stress is determined?
1 - From strain data - e.g. strain gauges, morie, ESPI, DIC
2 - From combined stress data - e.g. photoelasticity & thermoelasticity, hybrid numerifcal techniques, shear difference method, oblique incidence method
3 - Combined experimental techniques (Data fusion)
N.B. we want to determine stress so that we can compare this directly from stress data on FE
When using strain gauge rosettes, how can strain transformations be performed using equations?
When using strain gauge rosettes, how can strain transformations be performed using mohrs circle of strain?
What is meant by “when the complete strain state is obtained”
The following data is known
When the complete strain state is obtained how can Hookes Law be used?
Use Mohrs Circle to give a complete definition of stress
Some stress determination techniques only give us the sum or the difference in principal stress, how can hybrid numerical methods help us to separate these stresses?
