SAIF ALDIN ALI MADIN سيف الدين علي ماضي S96aif@gmail.com Experiment Name:- Deflection of curved beam 2. Introduction The deflection of a beam or bars must be often be limited in order to provide integrity and stability of structure or machine. Plus, code restrictions often require these members not vibrate or deflect severely in order to safely support their intended loading. This experiment helps us to show some kind of deflection and how to calculate the deflection value by using Castigliano’s Theorem and make a comparison between result of the experiment and the theory.