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Bonding Scenario | Design Requirement | Loading Scenario | Expected Stress | Notes |
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Chassis and Bottom Panel | Structural | 2G Bump | Tensile | This analysis laid the foundation for adhesive selection |
Vehicle Crash Scenarios | Shear | |||
Bulkheads to Chassis | Strong enough to allow mounting of potential dynamic assembly parts | 2G Bump | Shear | Later in the analysis, bulkheads were concluded to not be structural which led to ceasing its analysis. Documentation is still written for educational purposes. |
Vehicle Crash Scenarios | Tensile |
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Loading Scenario: 2G Bump
A 2G Bump is a frequent loading condition that a car will undergo. By selecting an adhesive to withstand this load, it can be certain that the bonded adhesive joints will remain intact during regular travel.
Finding Sum of Forces:
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Finding Bonding Area:
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Figure 6: The final bonding areas between the Chassis and Bottom Panel
Debrief of Results:
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Figure 7: Hand Calculations and Simulation Results
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Loading Scenario: Vehicle Collisions
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Vehicle Collisions include the absolute worst case scenarios that a vehicle is designed to withstand in the case of emergency. In terms of selecting an adhesive, only vehicle components that are required to be structural will need to have sufficient adhesive strength. In MS XIV, there are many bonded joints between carbon fibre parts and steel tubes, but not all joints are designed to be structural. For example, the purpose of an aerobody is to enhance our vehicle’s aerodynamics; it is not meant to sustain a load as large as a vehicle collision. On the contrary, the purpose of the Chassis is to withstand large impacts and large loads, i.e. vehicle collisions, therefore it is very much a structural part.
When analyzing MS XIV, the most concerning structural joint being bonded by adhesives is between the Chassis and the Bottom Panel. This connection revolves around very frequent loads and large range of loads during vehicle use. Other potential areas of concern include the Bulkheads A, B, and C. Research and analysis has been done on the stresses in the Bulkheads, but it was concluded that the Bulkheads did not serve a structural role. The largest area of debate was whether the Bulkheads served a role in distributing the force during a vehicle collision as they spanned the entire width of the car. As the Chassis has already been designed to independently withstand vehicle collisions, the analysis of the Bulkheads was no longer significant to selecting a sufficient adhesive.
Safety Factor of Adhesives can be found on this page:
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