How does Bronco maintain roof rigidity with no crossbar?

[Black Bronco Convertible]

I wish I didn't have a sport bar blocking a good portion of my open air freedom and I remember something about the rectangular opening being reinforced when they first announced the Bronco and was giving out info ;kajsd;flkjasdf I actually jsut remembered I could just ask AI about this as I was typing out this question.

time to go google this reinforced frame asdf nevermind i could just ask ai

but still no cigar. I'm just curious cause I wish someone would make a sport bar delete kit for the Wranglers.

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[Brian_B]

Boron steel frame

 

[swamp2]

Boron steel frame

The Boron Steel doesn't provide additional stiffness as its modulus of elasticity (essentially stiffness) is identical to other non Boron steel alloys.

The Boron steel adds to the safety and load carrying capacity of the structure since it is stronger, but it can not make up stiffness for such a significant and large piece of structure such as the roof cross brace.

 

[Techun]

Designed with enough material to be rigid enough. It would flex less if it had cross bars.

 

[zuke]

Jeep is stuck with the sport bar setup because of the fold down windshield and removable bars from the A to B pillar.

The Bronco doesn't have a fold down windshield, so that entire area of the cage structure can be made much stiffer, and it can actually use the A pillars and bar across the top of the windshield as cage structure much more effectively.

Personally, I'd rather have the structure of the Bronco with a crossbar on the B pillar as well, But it would definitely cut down on the open air feel.

I wouldn't eliminate the cross bar on any Jeep, In fact on all of mine (except the Wife's Gladiator I haven't yet) I've always upgraded the front of the cage to eliminate the weaknesses inherent in them. Rock Hard Sport Cage on the JKs, Poison Spider complete cages on TJs.

 

[jsoa]

I'm going in the opposite direction and prefer the cross bar so I went with https://goatfabrication.com/products/goat-bronco-4-door-cage-cross-brace-stiffener

 

[BigMeatsBronco]

The Boron Steel doesn't provide additional stiffness as its modulus of elasticity (essentially stiffness) is identical to other non Boron steel alloys.

The Boron steel adds to the safety and load carrying capacity of the structure since it is stronger, but it can not make up stiffness for such a significant and large piece of structure such as the roof cross brace.

Try comparing it to mild steel. ROFL

 

[swamp2]

Try comparing it to mild steel. ROFL

Not sure your point, but I will.

As I stated if does nothing for stiffness and has a significant impact on strength. Technically that means it's modulus of elasticity is identical to mild steel but both its yield and ultimate stress are significantly higher.

And, as I stated, it does not make up for the absence of a significant stiffening member.

 

[BigMeatsBronco]

Not sure your point, but I will., it does not make up for the absence of a significant stiffening member.

That all you got?

Try this link and learn that it Is HARDENED boron metal.....Turns it into martensite!!!! freaking fantastic!

NOTHING about it is identical to mild steel.

https://www.multimatic.com/manufacturing/structures/accra/

 

[BigMeatsBronco]

I'm going in the opposite direction and prefer the cross bar so I went with https://goatfabrication.com/products/goat-bronco-4-door-cage-cross-brace-stiffener

I definitely have HD crossbar on my half cab...it slides into the boron roll bar I hacked off. This stuff is SO tempered it's as hard as glass. Sawzall proof, takes a 4" grinder to get through it.

 

[userdude]

That all you got?

Try this link and learn that it Is HARDENED boron metal.....Turns it into martensite!!!! freaking fantastic!

NOTHING about it is identical to mild steel.

https://www.multimatic.com/manufacturing/structures/accra/

I hope you're right @BigMeatsBronco, cuz a lot of folk respect what you have to say and frankly, I don't know who to believe (@swamp2 seems to have a bead on things from a certain angle).

 

[TheKim]

.

 

[BigMeatsBronco]

I hope you're right @BigMeatsBronco, cuz a lot of folk respect what you have to say and frankly, I don't know who to believe (@swamp2 seems to have a bead on things from a certain angle).

The elastic modulus of mild steel can change for a number of reasons, including:

Strain: The elastic modulus decreases as strain increases.

Material movement: The elastic modulus can decrease as the material moves through die radii and draw beads.

Bauschinger effect: The elastic modulus can decrease due to the Bauschinger effect.

Material flow: The elastic modulus can decrease as the material flows to reach its designed shape.

Thickness: The elastic modulus can increase for higher grades of steel and smaller thicknesses.

The elastic modulus, also known as Young's modulus, is a fundamental property of a material that represents its stiffness. While it can vary by as much as 10% for some grades of steel, all steel grades have roughly the same elastic modulus. The strength of steel grades varies depending on heat treatments, rolling practices, and alloying compositions.

Martensite is a very hard form of steel crystalline structure. It is named after German metallurgist Adolf Martens. By analogy the term can also refer to any crystal structure that is formed by diffusionless transformation. Martensite in AISI 4140 steel 0.35% carbon steel, water-quenched from 870 °

 

[BigMeatsBronco]

plenty strong for a roll bar.

 

[userdude]

The elastic modulus of mild steel can change for a number of reasons, including:

Strain: The elastic modulus decreases as strain increases.

Material movement: The elastic modulus can decrease as the material moves through die radii and draw beads.

Bauschinger effect: The elastic modulus can decrease due to the Bauschinger effect.

Material flow: The elastic modulus can decrease as the material flows to reach its designed shape.

Thickness: The elastic modulus can increase for higher grades of steel and smaller thicknesses.

The elastic modulus, also known as Young's modulus, is a fundamental property of a material that represents its stiffness. While it can vary by as much as 10% for some grades of steel, all steel grades have roughly the same elastic modulus. The strength of steel grades varies depending on heat treatments, rolling practices, and alloying compositions.

Martensite is a very hard form of steel crystalline structure. It is named after German metallurgist Adolf Martens. By analogy the term can also refer to any crystal structure that is formed by diffusionless transformation. Martensite in AISI 4140 steel 0.35% carbon steel, water-quenched from 870 °

@swamp2 @BigMeatsBronco laid it down. You gotta let us know, where are we missing it? I know you're a a sharp engineer but this is it, tell us why or why not.

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