Description: In project 9a, we learnt that different materials have different microstructures, which directly control their different mechanical properties. Therefore, testing and knowing the mechanical properties of these materials is important for engineers to select the right material for the right application. We test the breaking point of some materials and learn to calculate things like the tensile stress, tensile strain, % elongation, young's modulus, ultimate tensile strength, ductility and toughness.
1. Why there are variations in mechanical properties of materials of the same type?
2. Why differences exist in mechanical properties of different materials?
3. What is the majority difference between polymer and metals in terms of mechanical behavior?
Description: In project 9b, we learn how the electron microscope is operated and how it works. However, we use a virtual SEM instead of the actual SEM due the cost of repair is case of damage.
1. What do you think may be cause if there is too much moisture on the specimen?
2. What is the working distance and accelerate voltage if the specimen is titanium?
3. Why can't we heat the filament too fast?
Description: In project 9c, we learn about composite materials. A composite material is a combination of 2 or more materials. It has desirable properties which only can be obtained by this combination of materials, rather than one material alone.
Logsheet - Total weight of the fiber matt used = (Not needed)
Weight of epoxy required = 30.0 g
Weight of hardener solution required = 20.0 g