Destruction Values of Glass

[Ugarik]

Our source: http://web.archive.org/web/20170322...luttershit-sucks-and-we-need-something.34025/

Frag. should be based on shear strength on the material and v. frag on tensile strength. But our glass values are both based on its fracture toughness (0.75 - 1 MPa*m^0.5)

This is absolutely wrong since fracture toughness has different dimensions compared to stress/strength and multiplication of it by volume does not give you work period. Anyway, the actual tensile strength of glass is 7 MPa .

 

[Buttersamuri]

This gonna result in glass being harder or easier to break?

 

[Ugarik]

Much harder, since 7 is greater than 1

 

[Buttersamuri]

alright. Making sure I understood that right. great timing. I just did a calc involving glass

 

[Spinosaurus75DinosaurFan]

Minor correction: It is not true that we base violent fragmentation on tensile strength, it seems to be a common misconception. We should use the high-end shear strength or the uniaxial compressive strength for violent fragmentation, as you can see in the blog you linked as well as my blog.

So you would have to try to find values for the shear strength of class. If you can't, I suppose you'll have to take 0.5 of tensile strength as fragmentation and 0.6 of tensile strength as violent fragmentation as I did for materials I could not find shear strength (shear strength is usually 0.5 to 0.6 of tensile strength).

 

[Ugarik]

It is not true that we base violent fragmentation on tensile strength, it seems to be a common misconception.

Why is that?

 

[Spinosaurus75DinosaurFan]

I am not sure where the myth that we use tensile strength came from, but as you can see in the Naruto Forums blog you linked, it uses high-end shear strength or uniaxial compressive strength for violent fragmentation, as I think they decided that was the closest to violent fragmentation (tensile strength is completely a different thing).

I also used high-end shear strength/uniaxial compressive strength for violent fragmentation in my updated materials blog, which was accepted and used now.

 

[Spinosaurus75DinosaurFan]

Since shear strength is usually 0.5 to 0.6 of tensile strength, I would suggest to use 3.5 j/cc as fragmentation and 4.2 j/cc as violent fragmentation, unless you can find more accurate values for shear strength.

 

[KLOL506]

What Spino said.

 

[Buttersamuri]

This increases my feats results to a nice amount. I am happy for this

 

[Spinosaurus75DinosaurFan]

The smashing windshield feat on Reference for Common Feats would need to be updated too.

 

[Buttersamuri]

Should also be updated in Car destruction and any common feat that has glass in it

 

[KLOL506]

Guess glass is stronger than it looks. Right on par with the thinnest of woods. (Well, it's not really that strong tho).

Reducing glass to powder is a whole new ballpark tho. But that value's been there for a while now.

 

[Buttersamuri]

Oh my that's gonna seriously upgrade making powered glass.

 

[Ugarik]

You mean like this?

 

[KLOL506]

Why yes LMFAO

Glass already has a pulverization energy of 1000 J/cc so we're good there.

 

[Buttersamuri]

Wait. So glass pulverizing is already where it should be?

 

[KLOL506]

yep

I only just brought it up for fun.

 

[Buttersamuri]

Ahh dang. I was hoping pulverizing glass would but harder than steel

So, should we ask other staff about coming here? Seems like changing Glass destruction value would have a decent effect

 

[Ugarik]

It is harder than steel. (not in the real world but that's what we use here)

 

[Spinosaurus75DinosaurFan]

It would be better if we find actual shear strength values for steel though, of course.

 

[KLOL506]

But we already have the shear strength values for steel tho

 

[Spinosaurus75DinosaurFan]

Sorry I meant glass.

 

[Buttersamuri]

Alright then. How would we go about doing that

 

[KLOL506]

Shear strength is 0.5-0.6 of tensile strength, which we already used to figure out the values.

Glass having a tensile strength of 7 MPa at its weakest...

Low-end of 0.5 (FRAG)- 3.5 MPa

High-end of 0.6 (V. frag)- 4.2 MPa

Comparable to some soft woods.

 

[Spinosaurus75DinosaurFan]

I know I already calculated that, I said it would be better if we could find an actual shear strength value.

 

[KLOL506]

Ah.

Sad thing is, I found nothing. I googled. Nada. Naught. 0.

Only got the tensile strength.

 

[Spinosaurus75DinosaurFan]

Also we probably need a source on the fragmentation value of marble, as "according to Bambu" sounds dumb, and he doesn't recall where that comes from either.

 

[Buttersamuri]

I haven't been able to find stuff o not either. I've tried to research glass before to also find a vap value, but never found much on it

 

[Spinosaurus75DinosaurFan]

Tensile strength of marble is 15 j/cc, so 9 j/cc for shear strength is exactly 60%, accurate I guess.

 

[KLOL506]

So, 7.5 J/cc for frag.

 

[Spinosaurus75DinosaurFan]

Nah we already have v. frag for marble based on uniaxial compressive strength and high-end shear strength (another source).

I think 9 j/cc is fine.

 

[KLOL506]

Ah, ok.

 

[Buttersamuri]

So What's Frag and V Frag then?

 

[Spinosaurus75DinosaurFan]

For glass? 3.5 and 4.2

 

[Buttersamuri]

Well alright then. That's a nice upgrade to Glass feats

 

[Buttersamuri]

When would this go in effect?

 

[Buttersamuri]

Bump

 

[KLOL506]

Once we find out the mere 200 pages that make any mention of glass.

 

[Buttersamuri]

Well I mean, like, I have a calc I've been holding that involves breaking glass, can I use this value or should I keep waiting