Lesson December 12th

# Matplotlib compatibility patch for Pyodide
import matplotlib
if not hasattr(matplotlib.RcParams, "_get"):
    matplotlib.RcParams._get = dict.get

Lesson December 12th#

Today we’ll discuss the results of the first exam assignment 2 on Statically indeterminate structures and exam assignment 1 on Continuum mechanics.

Results second exam assignment on Statically indeterminate structures#

../../_images/structure7.svg

Approaches taken during the exam assignment:

  • Hinge at \(\text{B}\) causes local mechanism \(\text{BE}\), could be dealt with by:

    • For ‘hoekveranderingsvergelijkingen’, first all cantilever parts should be replaced by moments and/or forces

    • If it’s the only mechanism (only one degree of freedom), use hybrid method (‘hoekveranderingsvergelijkingen’ with movable nodes)

  • Mistakes in sign moments around B

  • \(\varphi_\text{B}^{BE}\) set equal to rotation at tip of cantilever beam loaded by point load

  • Displacement of \(\text{E}\) consists of:

    • Bending \(\text{BE}\)

    • Rotation B

    • Bending \(\text{CD}\)

  • Mistakes in solving moment distribution

Results first exam assignment on Continuum mechanics#

../../_images/structure23.svg

Approaches taken during the exam assignment:

  • Mistakes in calculating stresses

  • Stresses in wrong direction acting on stress element

  • Shear stresses on perpendicular faces not in equilibrium

  • Normal stresses at both sides the \(x\)- and \(y\)-plane

  • Incorrect direction of shear stresses after rotation

  • Calculation of principal stresses inconsistent with stress element

  • Rotation from rotation centre doesn’t give correct new point

  • Incorrect location of rotation centre

  • A third nonzero principal stress

Create knowledge graph#

In the third lesson of the first week you created a knowledge graph on the topics you’ve encountered in the prerequisite tests, and how they link to the learning objectives of this course. Let’s try and extend today in a course graph. These course graphs will be incorporated in this book!

You’ll start with a template containing the (abbreviated) learning objectives and prerequisite learning objectives:

Your task is to add subjects to the learning objectives and the links between those.

  1. Login at https://prime-applets.ewi.tudelft.nl/login

  2. Wait for Tom van Woudenberg to add you to the correct Course Graph course

  3. Open the correct Course Graph Course: https://prime-applets.ewi.tudelft.nl/graph-editor/course-overview/CT1000

  4. Click on edit (edit) for your own course graph

  5. Click Edit Layout - Domains to check the layout and eventually change it a bit (remember to click Save when you’re done)

  6. Click Edit Fields - Subjects to add subjects. Try to keep the number of subjects per domain (which are the learning objectives) limited

  7. Click Subject relations to show relations between subjects

  8. Click Edit Layout - Overview to alter the layout (eventually use Auto layout) to a layout that makes sense to you

  9. Repeat steps 6-9 until you’re satisfied!

You’ll be able to view your graph in this book (see subpages)!

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