Alls I know is it's nice to see rocket surgeons involved in the ol' Jeep TJ community in some form or fashion. Can never go wrong with that.
Yep, often theory and practice are in conflict.lets say the frame comes in contact with a rock
Ok ... I have started the TJ Frame ASSY, I am dismayed at the level of quality of the -582/-583 Frame Drawings/Specifications ... I was taught (1996) to always use the Buttline/CL as the XZ Plane, the FWD Axle Longitudinal location as the YZ Plane, and the FWD Axle Vertical Location as the XY Plane ... seems only the JK/JL Frames and later adhere to this concept.
Oh well another legacy drawing in need of renewal .... I should have a 3VU OEM ready to share on Thurs/Friday of this week. I need to run a simulation on that model in steel to correlate to the real OEM frame ...
I would like to have interested forum members review and comment on the deformation response of the OEM frame at 1/2/3G at GVWR ... there will also be an Eix (Long Bend deformation at GVWR) and a GJ (Torsional/Twist deformation at GVWR) ... support 3 corners of the frame load to GVRW and measure the droop of the one corner at the frame height ... this test would not be advisable if you have rust concerns in your current frame ...
Your responses will establish a lower, a mean, and an upper limit for 1G stiffness, repairs and/or mods to the frames should be noted as well ... this data will either show my model as utter BS ... or that it has some legs/validity ...hoping for the later ....
Not quite rocket science (although a very expensive CMC “cousin” is often used) ... but thanks for the pat on the back ... from a self proclaimed “red-neck rocket scientist”Alls I know is it's nice to see rocket surgeons involved in the ol' Jeep TJ community in some form or fashion. Can never go wrong with that.
You'll be selling it out of your shop. No one will touch it for 10%. Think 40% margin if you want to develop a distribution network. You obviously have the tech skills but it's a no go with marketing margins so thin.If resellers/distributors can add value such as customer support then they can have 10% on top (not 50, not 75 and definitely not 100%)
Flex is a good thing in a Jeep. The reason frame body mounts are so thick is to allow flex. If yer composite does not allow flex, in the Jeep Trail Rated world it'll break.I honestly think that if a low weight, tailored stiffness
i didnt read all the discussion just the first page. this sounds like an amazing concept and it could be bery beneficial to may individuals. how would it do off roading in a situation where lets say the frame comes in contact with a rock or tree stump etc, how well would it hold compared to steel or possibly aluminum?
not trying to be rude but common english please. I kinda see where your going but my simple texas raised brain is lost lolGood Question! The on-design point equivalency for impact damage is usually with 6061T6 guaged for required stiffness. HUMs will confirm if the allowable has been exceeded ... DAMTOL is an endless path and so reason needs to dictate the limit for a “get home” scenario ... a 3G decel will pretty much be the structural limit without signifcant wall thickness increase
You and I should discuss repair/replace scenarios and the recent goings on with the insurance companies ... I personnally am of the predefined limited repair and then replace mind ... my education on the BMW Z22(i3) taught me all about the limits of “straightening” of Structural Frames
You'll be selling it out of your shop. No one will touch it for 10%. Think 40% margin if you want to develop a distribution network. You obviously have the tech skills but it's a no go with marketing margins so thin.
not trying to be rude but common english please. I kinda see where your going but my simple texas raised brain is lost lol
Hey no fair ganging up!
Damage Tolerance or DAMTOL (Abuse) is unfortunately a marketing thing ... I design to the required Standards of Safety ... Marketing wants it to withstand an undefined level of user abuse ... I become frustrated ... Marketing gets angry with me because they do not want to be pinned to an allowable level of abuse ... resulting in additional material weight, cost of material, cost of labour to locate material.
Bad news for me ... so I will say the DAMTOL limit is defined by max 30% Bending Stiffness loss when dropped from 20m at GVW... you can get home in this frame ... but not much farther ... if all else survives ...
Great, our first volunteer field tester! Just wish I'd thought of it first!i see said the blind man to the deaf dog. just out of curosity are you gonna be needing tester vehicles. id be down for a free one to test of course
If thats 10%.... you are marketing a TJ frame for $9500.00 ??If resellers are not interested in providing Customer Support for 750-1000$/Frame
i see said the blind man to the deaf dog. just out of curosity are you gonna be needing tester vehicles. id be down for a free one to test of course
If thats 10%.... you are marketing a TJ frame for $9500.00 ??
I'm pretty sure you need to quit the development thing and do the market research thing cuz I don't think you'll find anyone willing to spend $10K on a frame for a $10K TJ.
What kind of feedback, exactly, are you expecting? Most of the guys who frequent this website won't have any idea what they are looking at, let alone what it means. Not trying to slight anyone...just that you're speaking about pretty specialized engineering simulations...and if you don't do it for a living, interpreting them is next to impossible. Then, trying to co-relate the results of the simulation to real-world situations takes another leap of understanding.
I went to school for mechanical engineering, got my degree, and have spent the last 15 years working in the injection molding and assembly world...and I know I would not be any help trying to complement or criticize any of your results...at least without a TON of research and hand holding.
If you do post results, please be sure to post comparative data to the steel frame, and explain what it all means...down to 1/2/3G (factors of gravity).
Be glad to, but to surmise in a nutshell with very few exceptions, they are cheap! No big surprise.