# MATERIALS!-Part 1

Discussion in 'Homework Help' started by Hello, Jan 3, 2009.

1. ### Hello Thread Starter Active Member

Dec 18, 2008
82
0
Which material has the highest critical strain energy release rate?

Mild steel
Polypropylene
Polystyrene
Cement
Alumina

Any help is greatly appreciated.

Apr 5, 2008
17,954
3,370
Hello,

http://www.matweb.com/

It was mentioned on the page I already gave you.

Greetings,
Bertus

3. ### studiot AAC Fanatic!

Nov 9, 2007
5,005
521
I don't have values for all these to hand for K$_{IC}$ so you will have to look some up for yourself.

However mild steel and polypropylene are ductile materials and therefore the best candidates. All the others are brittle materials.

Mild steel 100-200
Concrete 0.2 -0.4
Polycarbonate 1.0 - 3.5
Acrylic 1 - 2
all in MN$^{-3/2}$

Look up 'fracture toughness' of each material. The one with the lowest is the most brittle, you require the most ductile.

4. ### Hello Thread Starter Active Member

Dec 18, 2008
82
0
Thanks, great help!