# Activity 5.6 Physical Property Analysis

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1 Andrew Smith Activity 5.6 Physical Property Analysis Introduction What do you need to know about a product before it is built? Would you need to know its volume, surface area, or weight? Would the product weigh less if it were made of aluminum or mild steel? What about copper, brass, or cast iron? How could this information impact the product design? How can you find the properties of a product before it is built? You can calculate them mathematically, providing you have the material specifications, but it will take time. In today s busy, fast-paced world, engineers use solid modeling software programs to speed up the calculating process. However, the user of the software must understand what the software is doing in order to estimate the answers and to be able to recognize a possible error. Equipment Engineering notebook Pencil Computer with 3D CAD solid modeling software Calculator Procedure In this activity you will calculate the volume of a part and the surface area; you will look up the density of the material and then calculate the mass. Next, you will check your work using a 3D solid modeling software program. After you have learned how to calculate the physical properties of the example parts provided, you will then do an analysis on a puzzle cube piece and parts of your Automoblox vehicle or other consumer product. Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 1

2 Aluminum Object Example 1 The aluminum example is provided as an isometric drawing that will need to be created as a solid model. The grid spacing for the object shown is 0.25 inch. Using the grid, determine the measurements for each facet of the part. Recreate the isometric sketch and record each facet s dimensions in your engineering notebook. Then calculate the volume and surface area of the object. Show your work in your engineering notebook. Next, create a model of the object with the required geometry using the 3D solid modeling software. You will assign aluminum as the object s material and perform a physical property analysis to determine the answers to the questions. Print a copy of the CAD Physical property values and insert into your engineering notebook. When you have completed the physical property analysis, answer the questions below. You may need to review your notes and the Physical Properties PowerPoint to recall how to generate the physical properties of a part. Figure 1: Isometric drawing of Aluminum Object One with 0.25 grid Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 2

3 Andrew Smith Questions for Aluminum Object One Directions: Complete the calculation by hand. Show all work below and select the appropriate answer based on your calculations. Check your work using the 3D modeling software. If your answers differ, explain why you think they are different where appropriate. 1. What is the volume of the part? A in.³ B in.³ C in.³ THIS ONE D in.³ I cannot if I want to save as an IPT! Answers would not appear on camera, either. 2. What is the density of aluminum in grams per cubic centimeter? (This may require research. Be sure to document your source.) All of these answers were helped with aqua-calc.com 2.69 (up) g/cm3 3. What is the density of aluminum in pounds per cubic inch? Show your work including all conversion factors lb/in3 4. Find the mass of the object (in pounds-mass) if it is made of aluminum. A lb m B lb m THIS ONE C lb m D lb m 5. What is the surface area of the part? A in.² B in.² C in.² D in.² This one Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 3

4 6. What are the physical properties presented in the CAD software? Include units. A. Density 2.7 g/cm3 B. Mass.134 lb mass C. Surface Area _10.25 in2 D. Volume in3 If physical properties are different from hand calculated values, explain why you think they differ. Human error! 7. If one quart of cleaning solution will clean in. 2, how many quarts will be required to clean 3000 parts? Use 3D software physical properties. A B C This one D Brass Object Example 2 An isometric drawing of a brass part is provided. The grid spacing for the object shown is 0.25 inch. Using the grid, determine the measurements for each facet of the part. Recreate the isometric sketch and record each facet s dimensions in your engineering notebook. Calculate the volume, mass, and surface area of the object and record below. Next, create a model of the object with the required geometry using the 3D solid modeling software. You will assign brass as the object s material and perform a physical property analysis to determine the answers to the questions. Print a copy of the CAD physical property values and insert into your engineering Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 4

5 Andrew Smith notebook. When you have completed the physical property analysis, answer the questions below. Figure 2: Isometric drawing of Brass Object One with 0.25 grid Questions for Brass Object One Directions: Complete the calculation by hand. Show all work below and select the appropriate answer based on your calculations. Check your work using the 3D modeling software. If your answers differ, explain why you think they are different where appropriate. 1. What is the volume of the part? A in.³ B in.³ C in.³ This one D in.³ 8. What is the density of brass in grams per cubic inch? Varies-is alloy. Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 5

6 9. What is the density of brass in pounds per cubic inch? Show your work including all conversion factors. Varies-is alloy. (Answers gotten from Inventor) 10.Find the mass of the object if it is made of brass. A lb m This one B lb m C lb m D lb m 11. What is the surface area of the part? A in.² B in.² C in.² D in.² This one 12. What are the physical properties presented in the CAD software? Include units. a. Density _8.47 g/cm3 b. Mass.622 lb mass c. Surface Area 12 in2 d. Volume in3 If physical properties are different from hand-calculated values, explain why you think they differ. Human error OR the fact it's an alloy. Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 6

7 Andrew Smith 13.What will be the total cost to ship 100 brass parts if the shipping rate is \$4.25 per pound? Use the physical properties from the CAD analysis. SHOW WORK. \$14.64 Cannot show work- High Density Polyethylene Example 3 You will begin by using Figure 2 isometric drawing to create a solid model. The grid spacing for the object shown is 1 cm. Note that this part has different dimensions (using metric units) than the similar part you created in Activity 5.5b CAD Modeling Skills Part 2. Recreate the isometric sketch and record each facet s dimensions in your engineering notebook. Next, create a model of the object with the required geometry using the 3D solid modeling software. (Hint: Use subtractive modeling by creating a rectangular solid, and then use the Loft tool to cut the V-notch.) Remember to use a metric part file template. Assign high density polyethylene as the object s material and perform a physical property analysis. Insert a copy of the CAD physical property values into your engineering notebook adjacent to the sketch. When you have completed the physical property analysis, answer the questions below. Figure 3: Isometric drawing of High Density Polyethylene Object using a 1 cm grid 1. What are the physical properties presented in the CAD software? Include units. A. Density.952 g/cm3 B. Mass.136 kg mass C. Surface Area (repeat) D. Volume (repeat) Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 7

8 Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 8

9 Andrew Smith 14. What is the surface area in square centimeters? SHOW WORK cm2 15. What is the volume in cubic centimeters? SHOW WORK (repeat) 16.What is the weight of the high density polyethylene part in pounds? Show your work and include all conversion factors..3 lbs 17.How many parts can be made from 152 pounds of high density polyethylene? SHOW WORK. 506, actual number is (repeat) Conclusion 1. What do you need to know in order to perform a physical property analysis? You need to know the dimensions and material of an object 2. Why is it important to understand the mathematics used in physical property analysis? It can affect shipment and production and use of an object 3. Why is it important to perform a physical property analysis prior to producing a part? It is important to realize if your equipment can even handle such high properties. Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 9

10 4. The clear enclosure piece and the wheels of the Automoblox are manufactured from polycarbonate. Do you think that the connector pieces are also manufactured from polycarbonate? Justify your answer. I would imagine so, if only because it saves money. A completely adhesive material would only harm it eventually, so just having some more polycarbonate wouldn't hurt. Introduction to Engineering Design Activity 5.6 Physical Property Analysis Page 10

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