donderdag 29 mei 2014

Materiaalkune 1 on OCW Delft lesson 2

Materiaalkunde 1 on OCW Delft lesson 2 

In this lesson I learned more on the properties of materials. One specific property that stood out for me was Dielectric strength. Other topics were the classification of materials in families and counting with logarithms. 

Material properties 

As mentioned dielectric strength stood out for me as it is a property to which I don't have an intuitive grasp. The guy in the lecture defined it as follows: 
"The dielectric strength of a material is a measure of how much a material will interact with electromagnetic waves"
And he had this picture on. But what does it mean?! So the radar sphere has a low dielectric response and the ships beam has a high response thereby making it visible on the radar? I think so, so basically high dielectric response indicates that a material will interact with electro magenetic waves, like the definition said... right
uh.. what?
To grasp this subject I first tried Khan academy which has a really good lesson on this. Other websites that were helpfull to me were:
 and this websites has some interesting information on dielectricity:

σ/(ωε’)Current conductionField propagation
0perfect dielectric
lossless medium
≪ 1low-conductivity material
poor conductor
low-loss medium
good dielectric
≈ 1lossy conducting materiallossy propagation medium
≫ 1high-conductivity material
good conductor
high-loss medium
poor dielectric
perfect conductor

This is already very helpfull in my day to day work. Getting a more intuitive grasp of dielectrics also gave me a better grasp of capacitance. A dieelectric is an intergral part of a capacitor. As a dielectric material increases the capacitance rating of a conductor. 

Classification of materials 

A helpfull and quite intuitive section of this lesson was the classification of materials. Basically it helps me group materials by family. For this classification to be really helpfull it would be good to know what the basic properties of each material family is.

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