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  1. CHagen

    Aluminum Tested at 100ksi UTS

    It is a flat section machined from the bottom of the tube where it is thick.
  2. CHagen

    Aluminum Tested at 100ksi UTS

    EdStainless, In the image it shows the strip was machined from it (lengthwise strip) 0.2500" wide and 0.1200" thick. My thoughts exactly. I want to ask for a graph (not provided).
  3. CHagen

    Aluminum Tested at 100ksi UTS

    Hi all, I recently had an aluminum sample tested for composition and tensile strength. The composition looked close to 7050, but just slightly off. The tensile was much higher than I expected or am aware of how to achieve. This was a tube more or less (image attached). How do you...
  4. CHagen

    Composites in non-redundant safety critical role

    My question is regarding reliably transmitting torsion via a shaft in a safety critical application. It seems like composites are often kept out of such scenarios where there is no redundancy and safety is critical of the component. I want to know of some scenarios where they are used like...
  5. CHagen

    Specifying damping from models and data

    Im not familiar with the Gillespie book to honest. Its neat that you tried to get a hold of him though. Thank you for presenting your method! The reason Im not using just sprung output over road input is that it leaves out whats actually going on at the contact patch which for the moment is...
  6. CHagen

    How does an initial setting of front Toe-in help in straight line stability?

    For the front wheels... With static toe in as you initially steer or are tracking strait with minor adjustments you increase slip angle on the outside tire and decrease it on the inside. This has the effect of increasing the pneumatic trail and slip angle drag on the outside tire and reducing...
  7. CHagen

    Specifying damping from models and data

    Given a simple 4th order quarter car model where you have the sprung and un-sprung mass and no tire damping I'm trying to develop a useful and robust way of specifying damping rates. My present path is to use a bode plot of tire spring deflection (power output from tire spring might be useful...
  8. CHagen

    Moments of inertia

    Hello all, Im putting together a simulation and will need some values of the moments of inertia about each axis. My thoughts were that a BMW 3 series, Ford mustang and a wrx may have a similar radius of gyration about the longitudinal axis (call this the x-axis). A corvette, 911, F430...
  9. CHagen

    At limit tire treatment for chassis design

    Pardon the ignorance, but write a simulation? What exactly do you mean by that?
  10. CHagen

    At limit tire treatment for chassis design

    Most equations for chassis design involve the tires cornering stiffness which is zero at its peak lateral force for a given condition. Just looking in Miliken this zeros out a lot of values if you were designing a neutral car that in theory all tires reached the limit at the same time or if you...
  11. CHagen

    Inverted strut loads

    Here is the picture Greg. BTW LBJ is 0 on the length scale. The two bushings are being simplified as point loads at their centers. I don't think its statically indeterminate, I could see that if the bushings were connected to the same ground as the LBJ and top bearing, but they are internal to...
  12. CHagen

    Inverted strut loads

    Ive got a free body diagram set up, but Ive confused myself into balancing it out a few different ways if you can believe it. Im trying to determine the lateral loads on the internal bushings under a load by applying a torque at the lower ball joint. Basically I am trying to get a ballpark...
  13. CHagen

    Toe out front static alignment

    This is fairly common among auto crossers and some road racers to improve on center steering response for turn in at the expense of braking stability usually. I dont understand how toe OUT up front improves on center response, it seems counter intuative. Unless drag forces from inside tire are...
  14. CHagen

    Resonance in torsion bar from torsional forces

    Ive got a debate going over an idea i had about the possibility of torsional resonance or oscillations with in a tosion spring. The current use of the torsion spring is about 20" long and .5" diameter with a .035" wall thickness. At each end is an leverage arm that recieves an input of often...
  15. CHagen

    Yaw damping

    Your comments about road feel are interesting. Please correct any misunderstanding if you see any. In the past I have looked at steering geometry of some cars with great road feel like the nsx and the old elan's, and no obvious scrub offset or trail or castor/kingpin inc. etc was ever tied to...
  16. CHagen

    Yaw damping

    Can you describe what you mean by "initial spike in the Mz function at zero distance traveled"?
  17. CHagen

    Yaw damping

    Cibachrome- My only glean upon these equations is Milliken, so Im trying to absorb your post, but have a few questions. I would have thought load transfer would have more effect on cornering stiffness than camber. Is this what you were getting at? I dont understand why the rear is more...
  18. CHagen

    Yaw damping

    Did a quick search for yaw overshoot as I am unfamiliar with the term and came up with nothing. Can you describe it a little further?
  19. CHagen

    Chopped fiber composite analysis

    From the sound of it it seems like the fibers/flakes align in the direction of flow as the molds are assembled. Is that true?
  20. CHagen

    Yaw damping

    Am I way off base here? I figured someone would have something to say by now. Anyone ever look at yaw damping as a parameter to work with or tune when developing a race or road car and how so?

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