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13 results for "James H. Allen, III, PE, PhD"

Using Mohr's Circle to Find Principal Stresses and Angles
Anyone in the mechanical sciences is likely familiar with Mohr's circle — a useful graphical technique for finding principal stresses and strains in materials. Mohr's circle also tells you the principal [more…]
Found in: Science 
Statics: How to Calculate a Force's Moment
In statics, moments are effects (of a force) that cause rotation. When computing equilibrium, you must be able to calculate a moment for every force on your freebody diagram. To determine a force's moment [more…]
Found in: Physics 
Checklist for Solving Statics Problems
Solving statics problems can be complicated; each problem requires a list of items to account for and equations to create and solve. Solve statics problems with ease by using this checklist: [more…]
Found in: Physics 
Statics: Computing Submerged Surface Pressures
When working submerged surface problems in statics, remember that all submerged surfaces have a fluid acting upon them, causing pressure. You must compute two pressures: the hydrostatic pressure resultant [more…]
Found in: Physics 
Calculating a Region or Load's Center of Area: Centroids
The centroid or center of area of a geometric region is the geometric center of an object's shape. Centroid calculations are very common in statics, whether you're calculating the location of a distributed [more…]
Found in: Physics 
Statics: Developing Shear and Moment Diagrams
Shear and moment diagrams are a statics tool that engineers create to determine the internal shear force and moments at all locations within an object. Start by locating the critical points and then sketching [more…]
Found in: Physics 
Cartesian Vector Formulas for Solving Statics Problems
In many statics problems, you must be able to quickly and efficiently create vectors in the Cartesian plane. Luckily, you can accomplish your Cartesian vector creations easily with the handy vector formulas [more…]
Found in: Physics 
Formulas for Calculating Stress at a Point
When dealing with mechanics of materials, choosing the correct formula to calculate the stress at a given point can be difficult. Normal and shear stresses come in a wide variety of applications, each [more…]
Found in: Science 
Basic Mechanics of Materials: Computing Stresses in Columns
Knowing how to compute the stress in a column (compression member) is a basic point of knowledge in mechanics of materials. Determine if the column is ' short, slender, or intermediate by computing its [more…]
Found in: Science 
Using a Generalized Hooke's Law for Stress and Strain
In mechanics of materials, Hooke's law is the relationship that connects stresses to strains. Although Hooke's original law was developed for uniaxial stresses, you can use a generalized version of Hooke's [more…]
Found in: Science 
Mechanics of Materials: Calculating Deformations from Loads
Deformations measure a structure's response under a load, and calculating that deformation is an important part of mechanics of materials. Deformation calculations come in a wide variety, depending on [more…]
Found in: Science 
Statics For Dummies Cheat Sheet
As with any branch of physics, solving statics problems requires you to remember all sorts of calculations, diagrams, and formulas. The key to statics success, then, is keeping your shear and moment diagrams [more…]
Found in: Physics 
Mechanics of Materials For Dummies Cheat Sheet
Students and professional engineers in the mechanical sciences know that mechanics of materials deals extensively with stress on objects — from determining stress at a particular point to finding stresses [more…]
Found in: Science