Question 2: Material and process selection for a prefabricated flashing (24 poin

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Question 2: Material and process selection for a prefabricated flashing (24 points) Consider a customized additively manufactured flashing that is designed to be inserted in the horizontal joints between sections of an assembled pre-cast concrete wall. A flashing serves the purpose of making the joint water-tight to protect against the elements. The width w of the fMashing is regarded as fixed by the geometry of the wall, as can the joint thickness t Imagine that the seal will be highly impermeable to water when: the damping force on the flashing is sufficient to cause the material to plastically yield, so that it tightly conforms to the surfaces of the concrete panels it is connecting, yet the flashing material is not fractured, and the force Fborne by the flashing is maximized · . EXTERNAL INTERNAL Flashing Mir 120mm Source: Precast concrete wall section Flashing (a) Arrive at a suitable material index for maximizing F, explaining your reasoning steps. You may assume that the materials being considered behave in an elastic-perfectly plastic manner for the purposes of arriving at the material index. (10 points) Suppose that there is interest in the feasiblity of printing such flashings with fused deposition modeling. Use the CES software, with the Level 3 material database selected, to identify all materials that the software claims are compatible with Fused Deposition Modeling. (b) How many material records are considered compatible with FDM? (2 points) (c) Of these, how many incorporate carbon or glass fibers? Comment on the feasibility of printing polymer-fiber composites. (2 points) (d) On the basis of your material index, list the top five materials that are considered compatible with FDM and explain which, if any, you think are genuinely feasible materials selections and which are not. In each case briefly explain your reasoning. You may refer to cost, and other material properties if you explain why they are relevant. You may wish to use CES material record data or generate additional Ashby charts to answer this question. (10 points, 2 points per material)

Explanation / Answer

Use soft material requirements to further narrow the field of possible material to a few optimum candidates

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