Mistakes:

Fatih Aşçı:
  Toughness: 
Amount of energy per unit volume, which a material can absorb before fracturing. Its unit is J per cubic meter and  

Are you sure that's your own words? Because ı saw the same description on the wikipedia.

Ahmet şahin 

Catia:CATIA (Computer Aided Three-Dimensional Interactive Application) is a professional CAD / CAM based software. Catia program; is a computer software that makes both design and analysis of all products for industrial purposes extremely fast, easy and reliable. This program is widely used because it can meet the needs of the automotive sector and aircraft production in general.

Catia is not a concept of mechanical engineering. It's a kind of cad programs. We can say it's a tool for engineering but catia is not a concept