Stress Tutorial

Some educational tutorial programs for stress and strain analyses are available for teaching. They are part of a course sequence in Mechanics of Materials, a series of engineering lecture tutorials is statics and dynamics of solid materials.

I would like you to access and run these programs as an additional teaching tool for the course. The programs can be executed on Macs, PCs, Linux boxes, etc.. The full set of hypercard stacks are found on the Online Lectures/Software set. These include MoM and Dr. Stress.

These tutorial programs can be downloaded from the engineering course webpage at the Univ of Washington:

http://gmiller.ce.washington.edu/cee220/MomMap.html

You can use the Mac tower in rm. 706 or download the programs for the PCs in the GG PC lab.

Also you can get the cross-platform HyperCard viewers for your own computer from the site listed below.

Exercise:

1. For the first part of the tutorial, I want you to access the Stress programs: Stress I, II, III and IV and go through the examples. Start out by activating the Stress Module, then work on through the examples.

2. Access the Dr. Stress file which will activate a three-dimensional Mohr's Circle interactive application. Run through this module for stress to see how one can envision how the compressional and shear components change across the faces of the cube and how that changes the Mohr's circle and stress values.

3. To show that you have gone through these steps, print out the last pages of each set, I, II, III and IV and Dr. Stress and hand them in.

Additional Downloading Information:

The stacks now have been ported to Revolution, which is a cross-platform, HyperCard-like environment. The port is still a little rough around the edges, and so I do not use this version for presentation (I run the old stuff in Classic on Macs), but it is fine for student self-study use. The main advantage is this version is entirely cross-platform: one need only download the appropriate player.

If you are interested in downloading and viewing the online lecture material, you can get the necessary player software from:

http://www.runrev.com/revolution/downloads/downloads.html

Download and install the appropriate version for your operating system, and then you should be able to view downloaded lecture stacks from the CEE 220 web site above:

http://gmiller.ce.washington.edu/cee220/MomMap.html

Simply click on the icon of the stack you wish to view, and it should then be downloaded to your machine where you can open it with the Revolution player. Since this port is still somewhat in progress, there will be the occasional formatting glitch or misplaced graphic, but overall things should work OK. All you need to make these things work is to use the left and right cursor (arrow) keys to go forward and backward, respectively. If you hold down the shift key, too, then you can move more quickly as all effects and animations will be skipped.

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- An early Carbon version of Dr. Beam is available for Mac OS X via the "Other Resources" section of the CEE 220 home page. The program generally works OK as is, but there are some issues with dialog layouts and a few other miscellaneous glitches. We actually are in the process of a rather complete revamping of Dr. Beam, but that won't be ready for distribution until late this year, at best.

- There are two versions of Dr. Stress available for OS X. The one labeled Dr. Stress 2.5b is basically a quick and dirty Carbon port of the older version that has been available for some time. The one labeled Dr. StressGL.app is a native OS X version that has much better graphics. This is also an early release, so there are rough cosmetic edges here and there, but it works OK (on initial start up, the windows will appear blank, but just click and drag to get the images to appear). The interface is noticeably different, but the basic functionality is essentially unchanged. The one thing that is useful to know is that by holding down the space bar and then clicking and dragging in the stress block pane, you can change the viewing angle. If in addition you hold down the ctrl, shift, and/or option keys (still holding down the space bar, too), you can move the camera in and out, pan, and zoom. One quirk I've noticed with this and other programs on my PowerBook is that if I use the touchpad rather than a mouse, it is necessary to tap one of the modifier keys to get basic dragging to work if a key is held down during dragging. With a regular mouse, this is not necessary.