Description

Theory/Practice
1

Laboratory
3

Instructors

Fernando José Ferreira

Contents

CP1. INTRODUCTION TO EXPERIMENTAL STRESS ANALYSIS (20%)
1.1 Reviews on the concept of stress and strain.
1.2 Transformation of stress.
1.3 Principal stress and principal directions of stress.
1.4 Theory of Elasticity.

CP2. EXTENSOMETRY (50%)
2.1 Mechanical strain gauges, optical and acoustic.
2.2 Electrical resistance extensometer.
2.3 Sensitivity and gauge factor.
2.4 Rosettes of three strain gauges.
2.5 Effects of temperature.
2.6 Selection of strain gauge.
2.7 Adhesives and gluing techniques.
2.8 Instrumentation. The Wheatstone bridge circuit.

CP3. PHOTOELASTICITY (20%)
3.1 The nature of light.
3.2 Polarizers lents.
3.3 Birefringent materials.
3.4 Quarter-wave lents.
3.5 Law of fundamental photoelasticity.
3.6 Plans and circulars polariscopes .
3.7 Reflection polariscope.
3.8 Photoelastic Materials..
3:9 Tridimensional photoelasticity.

CP4. OTHER TECHNIQUES AET (10%)
4.1 Fragile varnishes.
4.2 Moiré fringes.
4.3 Holographic Interferometry, Speckle and ESPI

Learning Outcomes

OB1: Presentation and study of the main techniques used to measure the strains and stresses, with emphasis on the photoelasticity and electrical strain gage techniques.
OB2: Understanding the theoretical and laboratory use of these techniques, focusing on electrical strain gauge.
OB3: To prepare students for Experimental Stress Analysis techniques application, in structures and mechanical components subjected to loads, focusing on electrical strain gauge.