Chapter 6, Processes and Their Effect on Properties Video Solutions, Materials Selection in Mechanical Design

Problem 1

Exploring processes. This chapter introduced the families of processes with schematics of some of them. Good images of many processes can be found on the internet. Use the internet to find images for the following:
a. Plastic film blowing
b. Filament winding
c. Additive manufacture
d. Metal spinning
e. Spot welding
f. Polymer extrusion

Maryam Riaz

Numerade Educator

02:27

Problem 2

Making property trajectories (1). The table lists properties of coppernickel alloys from pure copper to pure nickel. Plot a trajectory of thermal conductivity against copper content. How do you explain the shape of the trajectory?

Ankit Gupta

Numerade Educator

00:47

Problem 3

Making property trajectories (2). The table in Exercise E6.2 lists properties of copper-nickel alloys from pure copper to pure nickel. Plot trajectory of fracture toughness against yield strength.

Jorge Villanueva

Numerade Educator

02:19

Problem 4

Using property trajectories. An aluminium alloy is sought for a demanding application. For safety reasons the designer has specified a minimum fracture toughness of $30 \mathrm{MPa} \cdot \mathrm{m}^{1 / 2}$ and the highest possible strength. Use the property trajectory of Fig. $6.19$ to select an alloy and a heat treatment that meets the requirements. Use the internet to find out more about the alloy and the heat treatment that you select.

Ameer Said

Numerade Educator

02:06

Problem 5

Choosing optimal processing conditions. An approximate measure of the energy-absorbing capability of a metal is the product $\sigma_{y} \varepsilon_{f}$ of its yield strength $\sigma_{\gamma}$ and its elongation to fracture $\varepsilon_{f}$. These two properties for copper and copper-nickel alloys are the axes of Fig. 6.17. Plot contours of $\sigma_{\gamma} \varepsilon_{f}$ onto a copy of this figure and use them to identify the optimal processing to maximize energy absorption capacity.

Anand Jangid

Numerade Educator

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Problem 6

The CES EduPack '16 software contains sets of records for making process-property charts like those shown in Section $6.4$ of this chapter. If this tool is available, use these record sets to plot the process-property trajectory for
a. Thermal conductivity versus electrical resistivity for solution hardened copper as a function of solute concentration.
b. Vickers hardness versus elongation for medium carbon steel as function of tempering temperature.
c. Heat exchangers require materials with high thermal conductivity and - if pressurized - high strength. Explore the process-property trajectory for the thermal conductivity versus yield strength for aluminium grades to find the best combination for heat exchangers.
d. Do fillers change the thermal properties of polymers? Explore the process-property trajectories for the thermal conductivity and the expansion coefficient for filled polypropylene to find out.

Susan Hallstrom

Numerade Educator