Tag Archives: remote-ready

This Walled Pressure Vessels – Hot Dogs!

 

 Model Description This is a simple demonstration of the basic principals underlying the behavior of thin-walled pressure vessels (TWPVs).  A hot dog is used to show that hoop stresses are twice as high as longitudinal stresses in cylindrical pressure vessels and failure occurs along the length of the hot dog.  The failure that occurs in […]

The Big Book of Shear

 

 Model Description Students often have difficulty with shear and stress/strain transformation.  To give a quick demonstration of pure shear and stress transformation, blocks are drawn on the side of a BIG book to show the effects of shear and transformation of axes. This demonstration should take 3-5 minutes. Engineering Principle Shear occurs when parallel planes […]

Paper Stress Concentrations

 

 Model Description This is a simple demonstration of the basic principles and behavior underlying stress concentrations.  Stresses at points of load application can be much larger than the average stress in a member. The same is true when a member contains a discontinuity. Paper members with the same mid-span width are used to demonstrate the […]

Foam Beam

 

 Model Description This simple demonstration depicts how moments (and forces) result in bending of a beam and how the deformation is related to the assumptions associated with elastic beam behavior. A foam beam with vertical lines (black lines) and a horizontal line drawn along the neutral axis (red line) for a rectangular beam is used […]

Elastic vs Plastic Deformation

 

 Model Description This is a simple demonstration of the basic principles underlying the elastic and plastic behavior of materials subjected to an axial load.  The demonstration can also be used to show the highlight the elastic and plastic portions of stress-strain curves. This demonstration should take 8-10 minutes. Engineering Principle The basic definitions for stress, […]

Design of Axial Members

 

 Model Description This is a simple demonstration to introduce the basic principles of experimentation, analysis, and design in reference to axially loaded members. Copper wire is used to lift an object of known weight. In order to determine the minimum number of copper wire strands required to lift the load, students perform experiments, analysis, and […]

Axial Strain

 

 Model Description This is a simple demonstration of the basic principles underlying the behavior of materials subjected to an axial load.  The demonstration can also be used to show the usefulness of stress-strain curves versus load-deformation curves.  This demonstration should take 10 minutes. Engineering Principle The basic definitions for deformation and strain: where the axial […]

Total Energy

 

 Model Description This is a demonstration of the concept of total energy.  There are three principle components to total energy for introductory thermodynamics: potential energy, kinetic energy, and internal energy.  This demonstration should take 3-5 minutes. Engineering Principle Total energy is the sum of all forms of energy for a system.  In introductory thermodynamics it […]

Psychrometry

 

 Model Description This is a demonstration designed to introduce the basic concepts of psychrometry, the adiabatic saturation or wet bulb temperature, sling psychrometers and the ASHRAE comfort zone. This demonstration should take 8-10 minutes. Engineering Principle This demonstration is best used in a Thermodynamics course when the topic of psychrometrics is introduced.  It is designed […]

Molasses Madness

 

 Model Description This is a demonstration of the concept of conservation of mass.  By pouring an incompressible fluid (molasses), it is clearly demonstrated that as the velocity of the flow increases, the cross-sectional area of the flow must decrease. This demonstration should take 8-10 minutes. Engineering Principle Mass is conserved when the mass flow rate […]