Category Archives: Mechanics of Materials

Tower of Torque


 Overview Thrill your students with Tales of Torque using the versatile Tower of Torque!  In it’s simplest form, the device allows students to predict and then measure the capacity of a simple bolt, modeled as a rod in torsion. Principle For cylindrical rods in torsion, the maximum shear stress experienced is seen at the outer […]

Balloons!!: A demonstration of thin-walled pressure vessels


 Overview This is a simple demonstration of the basic principals underlying the behavior of thin-walled pressure vessels (TWPVs).  A balloon or balloons are used to show that hoop stresses are twice as high as longitudinal stresses in cylindrical pressure vessels. Principle The basic derivation for TWPV behavior states that for a cylindrical pressure vessel   […]