Have you ever seen a disaster in the news like the bridge collapse in the 
picture? Materials, like those that made up this bridge, fail because the motion of dislocations within them make them weaker. One strategy to strengthen materials is limit the mobility of dislocations within the material. This can be done by adding extra dislocations to the material. However, adding dislocations like that makes the material brittle and unwilling to bend. The challenge is to strengthen it just enough for the task but not so much that it’s too brittle for the task.
The student handout will be given to all students working on the design
challenge. It gives a brief recap of the story, it helps the students identify what they are attempting to achieve, and it recaps the design process.
Dislocation Motion TEK8 Instructor’s Guide
This Instructor’s Guide provides the instructor additional information on how to run the design challenge with alternatives for materials and test setups as well as information to help make the design challenge a good educational experience.
The Telling the Story Video conveys the societal impact of the student’s research that is the basis for the design challenge and will set the problem-solving context for students.
The Design Challenge Video leads students through the design process. It indicates materials available, states what the criteria are for success and any constraints. It also gives a second ‘level’ of the design challenge that allows ‘early completers’ to move on to a slightly more difficult challenge.
The presentation can be used in conjunction or in place of the Design Challenge Video.