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NFL Releases Finite Element Helmet Models

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Re: NFL Releases Finite Element Helmet Models

#61

Only thing safer helmets will do is encourage players to hit harder and harder, until someone really gets killed. I hope one day I will get to see the end of football. Why would any parent enroll their child in this sport?

Risk compensation. For those interested, here is the relevant Wikipedia article: https://en.wikipedia.org/wiki/Risk_compensation

Re: NFL Releases Finite Element Helmet Models

#62

Earlier quoted context omitted.

The issue with the crash safety comparison is that helmets need to withstand many impacts before being replaced since it would be crazy to replace a helmet every play or two. One possible answer is that, in order to truly solve this problem, the sport must do away with facemasks or helmets altogether. Mike Ditka has long proposed removing the facemask, claiming that it has encouraged players to weaponize their heads…

Why is it crazy to replace the helmets on each major impact? This is a multi billion dollar industry

These players have to start somewhere. A highschool can't eat the cost of multiple helmet replacements.

Re: NFL Releases Finite Element Helmet Models

#63
post #49

Safer helmets can do only so much as they are mostly a protection from external trauma. Little can be done to address the simple physics of inertia that causes the brain to crash into the skull due to sudden acceleration in any direction. The only thing that can drastically reduce that trauma is to make rule changes to the game to avoid the type of collisions that cause that acceleration.

If helmet size was no obstacle, could you add a thick inner layer of much softer foam to help gradually slow down the skull so the brain would crash into a suddenly stopped skull?

There have been a couple (or more) guys throughout the years that designed and implemented their own extra cushioning on their helmets, like this: http://www.helmethut.com/DrDelrye/Dr102808a.jpg

The extra foam was always on the outside, I believe. Not sure how well it worked.

Re: NFL Releases Finite Element Helmet Models

#64

Earlier quoted context omitted.

Simply play two hand touch or flag. Football is a fun game to watch and play without tackling.

I agree with you that this addresses the game of football, but certainly not the business of football. Which one do you think the NFL cares more about?

NFL players are like the modern gladiator. They look resplendent in their armor.

It's core to the image of Football.

Re: NFL Releases Finite Element Helmet Models

#65

Earlier quoted context omitted.

Simply play two hand touch or flag. Football is a fun game to watch and play without tackling.

I agree with you that this addresses the game of football, but certainly not the business of football. Which one do you think the NFL cares more about?

If the NFL switched to two hand touch 10 years from now, people would still watch. The violence is not essential. The competition, strategy, amazing throws and catches, speed, team aspect, drama, and unpredictability make it fun to watch.

Re: NFL Releases Finite Element Helmet Models

#66
post #49

Safer helmets can do only so much as they are mostly a protection from external trauma. Little can be done to address the simple physics of inertia that causes the brain to crash into the skull due to sudden acceleration in any direction. The only thing that can drastically reduce that trauma is to make rule changes to the game to avoid the type of collisions that cause that acceleration.

If helmet size was no obstacle, could you add a thick inner layer of much softer foam to help gradually slow down the skull so the brain would crash into a suddenly stopped skull?

Anything done to spread the acceleration out over a larger duration will help but once again it can only do so much. There is a point in which any additional padding is useless because the rest of the body has already come to a stop and there is only so much that your neck and spine can stretch before your skull will have to stop as well.

Re: NFL Releases Finite Element Helmet Models

#67

Earlier quoted context omitted.

I have paid for season tickets to college football for the past 18 years. Recently I've been reading more and more about this problem and I feel guilty for contributing to injury of players, willful participants or not. I'm considering not renewing and not watching, and I think we'll see the end of football (as we know it anyway) in our time. However I do find the strategy and team aspect of the game compelling. I wo…

As someone who has no knowledge of the American version, I wonder if the actual play could just be simulated? For a noob, how much is skill on the players part Vs strategy?

That's one thing that makes me wonder about viability w/o violence. The athletic ability of the player to take a hit and keep going, or break/slip out of a tackle, or make a perfect throw/catch etc is quite astounding.

More interesting is the subtle strategic parts that are easy to overlook: how you line up a offence/defense (coach), play calling (coach), decision making (players/coach), reading offensive/defensive schemes and adjusting (players), etc. etc.

One thing I think is really unique (maybe I'm wrong about this) is that it's a team sport, half of the game is played by the other half of the team, each depending on the other to put them in a good position.

Re: NFL Releases Finite Element Helmet Models

#68
post #2

For those wondering what a finite element model is: > FE models are computational tools developed by breaking an object down into simpler parts (finite elements) and assembling them into a larger system of equations to model an entire structure—this facilitates the efficient analysis of design changes to that structure. FE models have been used to improve designs in many engineered products, including those in the ae…

So they used mechanical engineering techniques you would learn junior year or earlier. I'm sure they used FEA on earlier helmets as well. This just sounds fancier. The next version is probably going to be called the DiffEq models. https://en.wikipedia.org/wiki/Finite_element_method

This is a very dismissive comment. Many of my peers in grad school were developing finite element techniques - it's a huge area of active ongoing research. Getting realistic results is very tough in an application with non-linear materials (probably looking at anisotropic composites) and possibly fractures like this.

Re: NFL Releases Finite Element Helmet Models

#69

You really need accurate material models for this to be any use. Without being able to validate the baseline condition using the same non-linear, anisotropic, material behaviour profiles, there's no way to develop new geometry and/or use novel materials, and actually prove it's better than before. They would ideally release their own, repeatable analysis files of their own benchmark condition. I suspect the best helm…

>Curious why they wouldn't just drop their funding on a grant for research in any top10 mechanical engineering department That's wishful thinking for the most part.

I spent a fair bit of time as a student employee a ME department. Students who have little real world experience, assignments with specific criteria they need to fill and a handful of other classes and activities competing for their time are not the kind of people you want designing things. You can make them design things but you'll probably toss basically all of it out and start from near scratch if you want to make it suitable for production. ME degrees are about teaching students the process of engineering not about teaching students to produce results and predictably students suck at producing results but do fine with the process. Even the students who are good at delivery results make rookie mistakes and go down time consuming dead ends left and right. Sure you can get some real engineers to hold their hands and help produce results but you'd need to have them so involved that you're better off just having an program to help place students in internships.

>Tesla has improved crash safety over what decades of safety engineers could do

How so? By building an incrementally stiffer (with regard to passenger cabin) box on wheels enabled by better packaging requirements of an electric drive-train?

Re: NFL Releases Finite Element Helmet Models

#70
post #52

Earlier quoted context omitted.

Why is it crazy to replace the helmets on each major impact? This is a multi billion dollar industry

The problem is that replacing the helmets after each play or major impact would take time, and the clock doesn't always stop after a play during football. If we stopped the clock to replace a helmet, we open up the possibility of a team using this to slow down an advancing offense, or by an offense to gain a short timeout in a sense. Basically it just doesn't mesh well with the flow of the game.

As someone who doesn't watch much football because the game doesn't seem to have any flow, it's interesting to hear that it is actually a concern.

https://www.sportsgrid.com/wp-content/uploads/2014/01/i3OtXs...

https://qz.com/150577/an-average-nfl-game-more-than-100-comm...

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