Preliminary Detailed Design
Team Vision for Preliminary Detailed Design Phase
- During the preliminary detailed designed phase, the team switched from compression testing to 3-point load testing. The 3-point load test better mimics the stress that will be seen in tiles. To conduct the 3-point load test, the team determine they will need to make new molds.
- The team determined that a DOE will be need to be conduct to get an optimal bio-char/concrete mix. The team began to determine the factors and variables that will go into the DOE and will continue this research into the next phase.
- For design, the team molded 3 different tile designs and conducted preliminary simulation measuring the displacement and stress on each tile.
- Lastly the team came up with testing plans for the mixing and design aspects of the project.
Why switch from Compression testing to Three Point Load test?
Three Point Load Specimen Molding
New Three Point Mold Plans
Design of Experiment
Biochar Particle Size
Plastic Bottle Fibers
Curved Mold Testing
Feasibility: Tile DesignsThree common tile designs are currently being considered; the flat tile, the S tile and the W tile. The 3D Cad models of the tiles are as shown:
SimulationsA simulation was ran for each tile, where the tiles were fixed on the bottom surface as well as the nail holes and the only load applied to the system was gravity. Since we do not have a final mix yet, there is no fixed density to be used, so a generic concrete density was used.
The results were looked at in two points of view:
- Where and how much it displaces
- Where and how much the loads are
When comparing the different tile design simulations, things to take note are the areas marked in red and the highest value on the top right corner.
The results are as shown:
Conclusions from the initial simulationsThe main aspect that we are looking at is where and how much the loads are, from one tile to another. Since the density used in these calculations are for generic concrete and not what we intend to make the tiles out of, the values are only valuable when compared with each other in this case, and is not to be a reference value for future use.
As we can see from the pictures, the flat tile has the highest stress values of the three. However, given that its basic geometry is easy to manufacture, the flat tile will be the backup plan, should all other tiles fail to meet any other criteria.
When comparing the W and S tiles, their stress values are similar to each other, and there does not seem to be any major stress points that we need to worry about on either of them. From the pictures it seems that the W-tile has a better distribution of load than the S, but more research has to be done. Currently there is no obvious better tile between the S and the W.
Some future plans to improve the simulations are:
- Meet with Dr. Ivancic to discuss simulation methods
- Obtain better values for the material for more relevant results
Initial House ModelAn initial house structure was also modeled in CREO to estimate how the tiles will be placed on the house, how many tiles will be needed, and possibly how much the whole roof will weigh.
Preliminary Concrete Mixing ProcedureHere is a detailed Preliminary Concrete Mixing Procedure that describes the details of our testing.
Design Testing Goals
Testing parts of the system to answer these questions as early as possible:
- 'Can we reasonably make this?'
- 'What are our biggest risks?'
- 'Does this subsystem or method work for us?'
Testing with full systemHow sucessful is our solution How durable are they What improvements can be made in the next iteration
Design Review Materials
Preliminary Detailed Design Presentation presented on 1st November 2016.
Here is the link to the video shown during the review: https://www.youtube.com/watch?v=gInN22guhG8
This video demonstrates how to set up the concrete on a vibrating table, then sliding it off the table and onto a mold to make a tile.