Friday, 29 May 2015

Group 7-4 Blog

Our Team


Overview

  • Challenge A: Tensile Testing of Engineering Materials
Engineering Stress:
Engineering Strain:
  • Challenge B: Scanning Electron Microscope (SEM)
The SEM produces images of a sample by scanning it with a focused beam of electrons. The electrons interact with atoms in the sample, producing various signals that can be detected and that contain information about the sample's surface topography and composition. The electron beam is generally scanned in a raster scan pattern, and the beam's position is combined with the detected signal to produce an image.

  • Challenge C: Composite Materials Processing
Composite materials are mixtures of distinctively different materials which, in combination, produce a material that has useful properties. 

Objectives
  • Challenge A: Tensile Testing of Engineering Materials
Students are to:

~Understand different mechanical properties of materials
~Observe how the three types of materials behave in their mechanical properties under the tensile and bend test
~Understand the major factors which determine those mechanical properties

  • Challenge B: Scanning Electron Microscope (SEM)
The main objective of this activity is to get familiar with the Scanning Electron Microscope
(SEM) and the most common detectors used to collect images and chemical data of 
materials.

Challenge C: Composite Materials Processing
The objective for this experiment is to introduce materials processing to us, students. In this case, it is composite materials. 
From this experiment, we should:
-Understand the meaning of composite materials and how to fabricate them
-Appreciate the applications of composite materials in daily life
-Appreciate the mechanical properties of composites

  • Achievements
  • Challenge A: Tensile Testing of Engineering Materials


  • Challenge B: Scanning Electron Microscope (SEM)

  • Challenge C: Composite Materials Processing
The picture depicts the carbon 
fiber matts and glass fiber matts before being mixed with epoxy and hardener solution. Hence, they remain flimsy and soft.


The carbon fiber matts and glass fiber matts are then arranged in the following order while being mixed with epoxy and hardener solution in the process.


The picture shows the process of drying the fibre matts.

Group presentation:
https://docs.google.com/presentation/d/16_C9a6O_Bg7siUfnilY75vHlFiBZLtssNAAdKC2rD1w/edit#slide=id.ga03804b7b_8_19

Limitations/Restrictions Faces

The SEM has a huge mass and size which makes it hard to be transported from place to place easily. Hopefully, in future, an improved version of the SEM could be created where not only is it lightweight and smaller in size but also allows the user to view smaller sections of an organism. We noticed that the SEM is only able to project images without colour. Maybe in the future, the SEM would be refined such that it is able to project the colour of organisms as well.

Other Discussed Questions

What inspired scientists to build the SEM?According to research, Manfred von Ardenne invented the first SEM. He applied the concepts used by Max Knoll who had produced a photo with a 50 mm object-field-width showing channeling contrast by the use of an electron beam scanner.

No comments:

Post a Comment