HigherEd 2.0

So here it is. Axial load (leading to strain and stress) in all its glory. I guess the key here is that the equation is really versatile, in the sense the we can use it alone, or in a summation, or in combination like what we saw in the problems from Wednesday […]

 

 Module 7: Axial Loading: Play Now | Play in Popup | Download

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This is the final bit of lecture about mechanical properties, and it focuses on Poisson’s ratio. This quantity was apparently first described by a French mathematician, and I’m sure this appears in Timoshenko’s History of the Strength of Materials. This lecture talks a bit about the typical values for Poisson’s ratio, and also […]

 

 Module 6: Mechanical Properties (Part 2): Play Now | Play in Popup | Download

 

 Movie: auxetic material: Play Now | Play in Popup | Download

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Let’s try this again…last time there was no discussion on the homework, and maybe that was because the assignment was not too hard? Let’s use this open thread to discuss and help each other with the homework, eh?
Prob. 2-6, 2-7, 2-15, 2-19
This assignment is due at the beginning of class on Friday 1/30 (NOON!). […]

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I don’t quite have the podcast ready yet, but I do have the pulse pen file for the lecture. Today we mainly focused on material properties in the context of the stress-strain diagram, and we saw the different types of behaviors (elastic, plastic) and also the different in stress-strain curves for different types of […]

 

 Module 5: Mechanical Properties (Part 1): Play Now | Play in Popup | Download

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I owed you this one from last week. I did it this morning as a “cold one” (i.e., I didn’t work out the solution ahead of time) on the pulse pen. The problem is reasonably straight forward, and the only subtlety comes in when we consider the stress-based failure criterion. We consider […]

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Welcome to module 4 on strain and deformation. Funny how this semester starts off with all the best engineering jokes about stress, strain, fatigue, and failure. As we discussed, strain in our class is usually calculated as a change in geometry, and you can think of the little thought exercise we did at […]

 

 Module 4: Deformation and Strain: Play Now | Play in Popup | Download

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In module 3, we look at the idea of average normal stress, then move on to a derivation about shear stress. The key idea here is that if we are far enough from the “edges” (where the loads are applied) we can use some sort of integrated quantity to represent the stress. For […]

 

 Module 3: Stress and Failure: Play Now | Play in Popup | Download

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Consider this a sort-of warm-up assignment which asks you to review your statics skills, and extend them to include stress calculations. Here’s the assignment:
Prob. 1-51, 1-82, 1-86, 1-102
Due date is Friday 1/23 at NOON. NO late homework will be accepted.
Use this post as an open thread for comments. This means you should […]

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This is our first introduction to the idea of stress. In this module, we examine stress at a point and you’ll notice that we use all the important tools from Statics to make these calculations. I encourage you to check out this module in one or more ways:

Review the PDFs I sent […]

 

 Module 2: Stress at a Point: Play Now | Play in Popup | Download

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Welcome to the course, and get ready for some interesting and exciting learning. This blog is the location you will visit to collect course materials, download podcasts and videos, discover and collaborate on homework assignments, and generally share course information. I hope that you will actively participate and support each other’s learning by […]

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