Guideline4_4

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School

University of Maryland, College Park *

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489O

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Mechanical Engineering

Date

Dec 6, 2023

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docx

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ENME 489O – Fall 2023 DFA Rules Name: Nathan Gernand Date: 10/1/2023 Rule Name: Material compatibility Rule Number: 1.4 Rule Description: This set of rules provides guidelines for the selection of materials used within an assembly. These rules will ensure parts are of material that allow for them to be friction fit and can stay together without the use of too much adhesive or too many fasteners. Background of Rule (Context): The objective of every assembly is always to see how effective of an assembly you can make for the smallest possible price. By researching and considering different types of materials, you can examine which parts to make out of similar material so that they fit as perfectly as possible without using adhesive or fasteners. Finding materials that are compatible allows for the assembly stay together without causing any harmful or detrimental effects that could lead to structural weakness within the assembly. If incompatible materials are used, a variety of harmful effects could occur. For example, corrosion, embrittlement, or other chemical reactions could occur when these materials are formed together. For example, if you are planning on creating an assembly that is to be used in seawater, aluminum and copper should never be used for any reason. This is because this can lead to galvanic corrosion, which is essentially rapid deterioration of the materials themselves. This would lead to a complete failure of the assembly, which is obviously not what is intended. Rule Condition (If statement): a) If hot water is a constraint to consider when choosing material for an assembly b) If dissimilar materials must be used for an assembly c) If there are fasteners that have threads being used in the assembly Rule Consequence (Then statement): a) Do not use PVC pipe as the elevated temperature of the water will cause the PVC to soften, and ultimately the assembly would structurally fail if in contact for too long. b) Ensure that there is an ample amount of insulation or barrier in between these materials to prevent corrosion c) Make sure to consider to the compatibility of the thread material as well to ensure gulling or corrosion doesn’t happen in that area Rule Illustrations (if needed):

Rule Justification: By following this set of rules designers can improve: Resistance to failure: structural failure due to materials not being able to interact with each other or their environment can be avoided by taking these precautionary measures Cost: Reduces the need for frequent repair or replacement of materials Rule Source: Material compatibility for multi-material injection molding . Fast Radius. (2022, August 25). https://www.fastradius.com/resources/material-compatibility-multi-material-injection- molding/#:~:text=Material%20compatibility%2C%20which%20has%20its,into

%20contact%20with%20another%20material.

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