Podcast
Questions and Answers
Which of the following is considered a constraint in material selection?
Which of the following is considered a constraint in material selection?
- Low Cost
- Design Versatility
- Temperature Resistance (correct)
- Weight Reduction
What is the purpose of reinterpretation in the design process?
What is the purpose of reinterpretation in the design process?
- To enhance the aesthetic appeal of the product
- To clarify the design requirements in terms of function (correct)
- To reduce the complexity of product specifications
- To change the objectives for better profitability
Which of these is an example of an objective in the material selection process?
Which of these is an example of an objective in the material selection process?
- Low Cost (correct)
- Non-fixed Dimensions
- Support Load
- Fixed Dimensions
What differentiates 'free variables' from 'constraints' in design requirements?
What differentiates 'free variables' from 'constraints' in design requirements?
Which of the following directly contributes to the overall functionality of a design?
Which of the following directly contributes to the overall functionality of a design?
What is one major requirement for the bending stiffness of the ski core?
What is one major requirement for the bending stiffness of the ski core?
Which of the following should the yield strain (elastic limit) be?
Which of the following should the yield strain (elastic limit) be?
What dimensional constraints are given for the ski core?
What dimensional constraints are given for the ski core?
Which objective is NOT mentioned for the ski core?
Which objective is NOT mentioned for the ski core?
What is the maximum allowable elastic modulus (E) for the ski core material?
What is the maximum allowable elastic modulus (E) for the ski core material?
What is the purpose of ranking candidates after the screening step?
What is the purpose of ranking candidates after the screening step?
What can be used to quantify the overall importance of multiple objectives during candidate selection?
What can be used to quantify the overall importance of multiple objectives during candidate selection?
Which of the following is not an example of a property that could be part of a performance index?
Which of the following is not an example of a property that could be part of a performance index?
What should be checked regarding the top-ranking candidate in material selection?
What should be checked regarding the top-ranking candidate in material selection?
Which approach helps keep the most performant materials during the selection process?
Which approach helps keep the most performant materials during the selection process?
Which of the following best describes a performance index?
Which of the following best describes a performance index?
What does the process of maximizing or minimizing a measure of performance typically involve?
What does the process of maximizing or minimizing a measure of performance typically involve?
What is a common misconception regarding the suitability of the top-ranking candidate?
What is a common misconception regarding the suitability of the top-ranking candidate?
What is the minimum yield strain required for materials to be considered feasible?
What is the minimum yield strain required for materials to be considered feasible?
What is the maximum value for Young's modulus for materials to be considered feasible?
What is the maximum value for Young's modulus for materials to be considered feasible?
Which of the following materials is not typically classified as feasible?
Which of the following materials is not typically classified as feasible?
Which category of materials includes only feasible options according to the screening criteria?
Which category of materials includes only feasible options according to the screening criteria?
What does the ranking step involve according to the provided parameters?
What does the ranking step involve according to the provided parameters?
What is one of the main concerns of the materials discussed in the screening criteria?
What is one of the main concerns of the materials discussed in the screening criteria?
Which of the following natural materials is listed as a part of feasible materials?
Which of the following natural materials is listed as a part of feasible materials?
What parameter involves looking up data for the remaining materials?
What parameter involves looking up data for the remaining materials?
What does limiting two properties at once do to material selection?
What does limiting two properties at once do to material selection?
In the performance index for material selection, how is the index formulated?
In the performance index for material selection, how is the index formulated?
Which of the following steps is NOT part of the approach to material selection?
Which of the following steps is NOT part of the approach to material selection?
What is a characteristic of the Ashby chart used in material selection?
What is a characteristic of the Ashby chart used in material selection?
What does the equation $P=\frac{y}{x^{1/\alpha}}$ represent in the context of material selection?
What does the equation $P=\frac{y}{x^{1/\alpha}}$ represent in the context of material selection?
Why is it important to consider material properties during the design process?
Why is it important to consider material properties during the design process?
Which of the following does NOT apply to the material classification system?
Which of the following does NOT apply to the material classification system?
What does the variable 'P' represent in the performance index equation?
What does the variable 'P' represent in the performance index equation?
Which material is considered a renewable resource?
Which material is considered a renewable resource?
What aspect of material selection does not primarily focus on?
What aspect of material selection does not primarily focus on?
Which material is diagnosed as non-renewable due to its production properties?
Which material is diagnosed as non-renewable due to its production properties?
What tool is useful for evaluating material trends and aiding material selection?
What tool is useful for evaluating material trends and aiding material selection?
What does validating a material choice ensure?
What does validating a material choice ensure?
What is a notable drawback of plywood as a material?
What is a notable drawback of plywood as a material?
Which material option offers a fast production time with high throughput?
Which material option offers a fast production time with high throughput?
What is the primary focus when screening and ranking materials in selection processes?
What is the primary focus when screening and ranking materials in selection processes?
Flashcards
Material Selection
Material Selection
A process of choosing materials based on specific functions, constraints, objectives, and free variables for a design.
Design Requirements
Design Requirements
Specifications for the desired features and functions of a product.
Constraints
Constraints
Limitations or restrictions on a design, such as fixed dimensions or available resources.
Objectives (Design)
Objectives (Design)
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Free Variables
Free Variables
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Bending Stiffness
Bending Stiffness
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Yield Strain (εel)
Yield Strain (εel)
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What is the relationship between bending stiffness and Young's Modulus?
What is the relationship between bending stiffness and Young's Modulus?
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What is the goal with the ski core?
What is the goal with the ski core?
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What are the Free Variables in ski core design?
What are the Free Variables in ski core design?
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Ranking (in Material Selection)
Ranking (in Material Selection)
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Performance Index
Performance Index
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Weights (in Material Selection)
Weights (in Material Selection)
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Feasibility Check
Feasibility Check
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Internet Search for Material Information
Internet Search for Material Information
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Top-ranking Candidate (Not Always Best)
Top-ranking Candidate (Not Always Best)
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Selection (in Material Selection)
Selection (in Material Selection)
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Unknowns in Material Selection
Unknowns in Material Selection
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Material Class
Material Class
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Feasible Materials
Feasible Materials
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Characteristic Field
Characteristic Field
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Limiting Two Properties
Limiting Two Properties
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Performance Index (P)
Performance Index (P)
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Ranking Approach
Ranking Approach
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Ashby Chart
Ashby Chart
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Guidelines on Ashby Chart
Guidelines on Ashby Chart
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Screening Materials
Screening Materials
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Young's Modulus (E)
Young's Modulus (E)
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Foams
Foams
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Elastomers
Elastomers
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Ranking Materials
Ranking Materials
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Price per Volume (Pv)
Price per Volume (Pv)
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CO2 Footprint per Volume (Cv)
CO2 Footprint per Volume (Cv)
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What is the first step in material selection?
What is the first step in material selection?
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What are design constraints?
What are design constraints?
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What are design objectives?
What are design objectives?
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What are free variables in material selection?
What are free variables in material selection?
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What does material validation involve?
What does material validation involve?
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What are Ashby charts used for?
What are Ashby charts used for?
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Why are sustainability indices important in material selection?
Why are sustainability indices important in material selection?
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What are some key factors to consider when validating a material?
What are some key factors to consider when validating a material?
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Study Notes
Engineering Design and Material Selection
- Lecture 11 focused on Material Selection.
- The lectures were delivered by Prof. Dr. Kristina Shea and Dr. Tino Stankovic.
Course Schedule
- Week 1: Introduction and Sketching
- Week 2: Introducing Engineering Design (Health Case Study)
- Week 3: Technical Drawing: Projections and Cuts
- Week 4: CAD: Introduction and Modeling Operations
- Week 5: CAD: Features and Parametric Modeling (Future Mobility Case Study)
- Week 6: CAD: Freeform Modeling
- Week 7: CAD: Assemblies and Standard Mechanical Parts
- Week 8: Technical Drawing: Dimensioning (Health Case Study)
- Week 9: Sustainability in Engineering Design
- Week 10: Materials and their Properties
- Week 11: Material Selection (Sustainable Materials Case Study)
- Week 12: Manufacturing Processes with Focus on Additive Manufacturing
- Week 13: Review and Q+A
Learning Objectives
- Understanding factors influencing material selection during the design process.
- Learning the concept and creation of Ashby charts and their use for material selection.
- Mastering strategies for material selection and their application to examples.
Oxo Goodgrips Peeler
- Material: Santoprene (a polymer behaving like rubber but processed like a thermoplastic).
- Components: Oval handle, Fins, Countersunk Hole.
- Key features of each component: Functional, aesthetic, and manufacturing considerations, in the context of ergonomics, comfort and aesthetics of the handle.
Challenge of Material Selection
- There are many suitable materials/ too many materials, requiring a selection strategy.
When to Select Materials
- Material selection is an iterative and convergent process.
- It occurs throughout different phases of design - Planning, Concept, System-Level, Detail.
Material Selection Strategies - General Approach
- Steps of Material selection process - Translation, Screening, Ranking, Validation.
- Techniques for reinterpretation of design requirements
- Isolation of viable materials through screening
- Ordering viable materials based on performance
- Seeking documentation and validation for top-ranked candidates.
Computer-Aided Material Selection
- Computer software can isolate suitable materials through various filtering and combination steps for screening.
One-Dimensional Material Selection
- A linear graph displaying different materials, based on a variety of parameters, such as Young's Modulus versus density..
Two-Dimensional Material Selection – Ashby Charts
- Displays properties on a two-dimensional plot, helping to visualize material selection.
- Uses logarithmic scales to visualize a wider range of property magnitudes.
Two-Dimensional Material Selection - Performance index
- Formulate the performance index.
- Guideline lines, visualizing equal performance or quantities in a 2D plot.
Example: Minimum Mass Design – Stiffness – Beam in Bending
- Illustrates the method of identifying parameters and selecting correct material when other factors (such as geometric constraints) are given.
Exercise 11
- Exercise asks to identify best materials for various objects: a diving board, an ice axe, and three longboards.
Material Selection - Wrap Up
- Material selection is a process considering function, manufacturability, sustainability, relevant screening and ranking.
- Ashby charts are useful for material selection.
- Sustainability indices are important.
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Description
This quiz focuses on Lecture 11 of the Engineering Design course, which emphasizes the crucial topic of Material Selection. Engage with questions relating to the sustainable materials case study, and enhance your understanding of how material properties influence engineering design decisions.
