Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Team is waiting on two rods to arrive for machining. In the meantime, one of the three rods for the 3-point bend test are under machining to proper dimensions prepared from a CAD. Moreover, some parts require post-processing to remove rust and milling scales.
Some parts for the door prototype are already fabricated. Further parts will be fabricated as well and riveting and bonding will be applied this week.
Testing is also planned to happen later in the week after door assembly.
Accomplishments from Previous Week
Last week, Kakeru consulted with Steve to select necessary bars for the 3-point bend test and began machining them to the dimensions Kakeru drafted on CAD.
Ahmed ordered 2 additional bars required for the 3-point bend test. This bar will also be machined this week.
Joao went to the machine shop and machined the skin and stamped sheets for the stiffener.
Shane took the lead of drafting the poster, which will be reviewed and discussed on Monday's meeting.
Ahmed incorporated the feedback from Collins Aerospace to the report.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Shane and Ahmed will apply FEA to the current model and obtain the maximum shear force before failure. This value will then be compared to the theoretical maximum shear force Kakeru calculated for verification and justification.
Joao will take the lead to machine all parts and assemble the prototype door by riveting and bonding.
Kakeru will focus on verifying the theory to calculate the deflection of the current model of the door, which will be compared with FEA results from Shane and Ahmed.
Kakeru will machine the rods to the proper dimensions for the 3-point bend test. He will also get welding assistance from the machine shop staff.
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Collins Aerospace reviewed the most up-to-date report and provided feedback on how the report can be improved. No major concerns with the design of the prototype, but the changes will be implemented to the final report.
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Professor Tustaniwskyj suggested using square, wooden planks to clamp the stamped sheets together for assembling and bonding. This would improve and ensure the stamped sheets would be in the "z-shaped" design.
The overall deflection of the entire prototype is dependent primarily on the skin only since the stiffeners and strips are exposed to the cabin pressure. Any deflection would arise in regions where the differential pressure exists, which is only through the skin.
When fabricating the metal sheets, the edges should be smoothened via post-processing methods to prevent any injury to anyone holding the prototype.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
No comments from other students. The team had the weekly meeting with Professor Tustaniwskyj and Ved, which did not involve other students.
Risks and Areas of Concern
All in this week, the following tasks must be completed:
machine and fabricate at least one door to undergo a 3-point bend test
machine and fabricate 3-point bend test bars to test
test and collect data for deflection vs force applied to the testing prototype
compare experimental results with theory and FEA results for final verification that the design meets constraints provided by Collins Aerospace.
The concern is whether all of these tasks can be completed within the week.
Resources or Information Required but not Available
Kakeru prepared hand-calculations of the theoretical deflection of the entire prototype including the stiffener, but requires verification from Professor Tustaniwskyj. However, the team is scheduled to meet with Professor Tustaniwskyj and Ved on Monday's meeting, so the verification can be arranged on that day.
Schedule
Monday - Wednesday:
To machine all parts and assemble a small-scale prototype door for testing.
To machine and weld all parts to assemble testing bars for 3-point bend test.
Thursday-Saturday:
Apply 3-point bend test on the small-scale prototype.
Collect force vs displacement data.
Film the experiment for display for next week's poster session.
Consider comments from Professor Tustaniwskyj, Ved, Team 11, and from Collins Aerospace and include 3-point bend test results into the final report by Friday, 6/7.
Include comments and 3-point bend test results into the final poster design by Sunday, 6/9.
Include videos, images of the 3-point bend test and CAD, and comparison between simulation and experimental results onto the team webpage.
Budget (list amount spent and amount remaining)
$917.10
Progress on Report and Webpage
Collins Aerospace reviewed the most up-to-date report and provided feedback on how the report can be improved. No major concerns with the design of the prototype, but the changes will be implemented to the final report.