generally rectangular sections that are 25 mm x 100 mm x 1.6 m-
Overall To-do: -apply feedback to the confluence, detailed and clear manufacturing plain
-List who worked on project, timeline, advisors, roles, etc.Designed by: Ethan Sobkowich, Yanshen Zhou, Winnie Lin
Purpose: Fixture for preparing adhesive test specimens of similar sizes (25 mm x 100 mm x 1.6 mm)-*need statementCriteria: - criteria=minimize/maximize _____
Needs statement: There exists a need to create a fixture that can hold specimens a stationary position for adhesive curing while being adjustable to different specimen sizes.
Constraints:
Functional Requirements
All three adhesive joints curing at the same time
Constrained movement in three axis
Criteria:
Maximize number of specimens that can cure at the same time
Can be machined in-house
Minimize time required to manufacture
Maximize adjustability to different size
Minimize costs for materials and manufacturing
-constraints: needs, functional, non-functional
*can organize into checklist
Testing between:
Steel to steel
Composite to composite
Steel to composite
...
The idea behind this design is to create a “tray” (Fig. 1) to constrain movement in the outer edges of the specimens. Multiple specimens can be cured at the same time in this tray. The spaces between each individual specimen will be separated with ladder-shaped 3D printed jigs (Fig. 2) as well as the spaces between each adhesive joint on a specimen (Fig. 3). A flat board/weights will be placed on top of all specimens to add pressure. Each ladder
Fig. 1 -title figures/label components in figures
...
Figure 2, seen below, is a side view of three separate test specimens. This is how they will be aligned in the jig.
Fig. 2 -title figures/label components in figures
Figure 3 is an example of how the jig will clamp the test specimen. The green planks are aligned as seen in Figure 2. A flat board should be placed on the ground first and then the specimens should be placed on top of it. Then, a flat board (like a piece of plywood for example) will be placed on top of the specimens and weights will be placed on top of the board to apply downwards pressure on the z axis (purple). There will be four longer boards, two per axis, that run parallel with the sides of the specimens on the x and y axis. These boards are in place so that pipe clamps can apply pressure from the sides (red). The idea is that the blue square-shaped pieces will ensure that the test pieces line up properly under clamping force. It is possible that more thin brown square pieces may need to be added in the middle section. Nine of these specimens can be lined up at once inside of this tray.
...
Fig. 3-title figures/label components in figures
Adhesive Anti-Sticking Solution
...
Parchment Paper
Wax Paper
Polyethylene sheeting (saran wrap)
Mold-release compounds for epoxy
PTFE Tape
Criteria Overview:
*ranked in order of most important to least important
1. Effectiveness-reorganize criteria (different weightings for each criterion)
how well the solution prevents the adhesive from sticking onto the fixture
2. Ease-of-Use
how quickly the solution can be applied and removed from the fixture
3. Feasibility
how easy is it to obtain the solution; is it widely available?
4. Affordability
how much the solution costs
5. Maintenance
how often does the solution need to be replaced on the fixture
Parchment Paper | Wax Paper | Saran Wrap | PFTE Tape | |
Feasibility |
10/10 |
10/10 |
10/10 |
810/10 |
Ease-of-use -non-functional req. (use survey to evaluate) |
7/10 |
7/10 |
9/10 |
6/10 |
Effectiveness |
9/10 |
8/10 |
9/10 |
5/10 |
Affordability | 12 in X 75 ft $4.99 CAD @ Canadian Tire | 75 in $4.49 CAD @ Canadian Tire | 25 m $1.79 CAD @ Canadian Tire | ½ “ X 480” $0.79 CAD @ Canadian Tire |
Maintenance | Remove tape and paper after each use 7/10 | Remove tape and paper after use 7/10 | Remove wrap after each use 8/10 | Can reuse multiple times 9/10 |
Source: https://www.youtube.com/watch?v=uLH1MsaHnX4
-create eng. design spec. chart
Characteristic | Relation | Value | Units | Verification Method | Comments |
|---|---|---|---|---|---|
Production Cost | < | ||||
-define effectiveness
Overall: Saran wrap is the best material to use due to its ease-of-use and effectiveness. It is also one of the more affordable options and is easy to maintain.
-other factors: interference with test specimen (wrap thickness)
Assembly Procedure
Step 1: Printing
...
Align first specimen in a corner with the longer side of the specimen touching the shorter side of the curing fixture.
Wedge a support fixture along the specimen to hold the individual pieces in place.
Place two support fixtures perpendicular to the first specimen to provide support for the next one. Continue placing specimens down until the tray is full.
Place a flat board on top of the tray and specimens. The flat board should also be wrapped in saran wrap. Place a weight on top of the board.
-pictures with assembly
-bill of materials w/ quantities + descriptions
-some explanation for procedure (decision behind assembly process; why?)
Material Specifications