![]() If a UD-CFRP sheet is adhered on the tensile side of an Al bumper reinforcement, not only Al thickness on the tensile side, but also thickness on the compression side can be reduced due to movement of the bending neutral axis. When vehicles crash, bumper reinforcements may be subjected to bending force. Compared to Al, UD-CFRP sheets have even higher tensile strength and modulus. The intention is to prevent an increased part cost by reducing the amount of Al and by minimizing the amount of CFRP. In this study we have developed a lightweight, structural part, which consists of a thin-walled Al (Aluminum) bumper reinforcement with a UD (Unidirectional)-CFRP sheet. However, because of their relatively high cost, applications of CFRP materials to vehicle structural parts are limited. CFRP (Carbon Fiber Reinforced Plastic) composites are attractive lightweight materials due to their excellent specific strength and rigidity. just a small crack near the numberplate where the number plate mount broke and split the bumper a couple of cm's but cant really see that.Since bumper reinforcements are positioned at front/rear ends of vehicles, weight reduction of the bumper reinforcements enhances vehicle dynamic performance by reducing a yaw moment of inertia. Im surprised how well the bumper took it, not broken, no clips broken, very flexible for the amount it was flexed, not even the paint cracked. Not going to bother replacing the bumper until it gets sold as the Mrs cant drive for and will only scratch it again. No labour bits that require replacement = $675 New number plate mounting bit, $99 (what a rip) its the size of your hand. Reinforcement bar $135 after market, don't ask genuine price, you don't wanna know. just bending it back will fix that though.įront bumper genuine $750, after market $245 it has pushed the bonnet catch up a bit as its connected to that bar so cant close the bonnet very easily. im pretty sure there aint no other damage either, ive been under there, looked at it all many times, looks good, just a bent bar. It is just a bit of sheetmetal out of shape. ![]() I'm pretty sure there is no structural damage to your car. It is well within the scope of a competent DIY person, and really is a basic job. It's only a matter of removing the bumper skin (usually only a few plastic scrivets and a couple of threaded fasteners) and in the case of this reo, possibly unbolting the horn, the bonnet catch bracket, and maybe a power steering cooler. This is also the recommended practice that has been printed in factory service manuals for the last 20+ years, by nearly all manufacturers. The airbag will not go off if there's no battery power. If you are paranoid about "stored energy" in capacitors & the like, then wait 20 minutes before doing anything. Hell, the airbags wouldn't have even gone off when she hit the pole in the first place! This reo replacement is no harder, and no more dangerous than changing a tyre, or fitting a towbar tongue - and both those have more risk of you don't do them up tight.Īs with working on anything electrical in the car, simply disconnect the negative battery terminal. Any mechanical "impact" from doing so is way below the threshold to trigger the system. Wielding a ratchet or a few spanners on the reo simply will not set off the airbags. Only the required airbag is deployed dependant on the direction of impact - this is what the sensing module controls. You'd have to be doing something pretty stupid to set off an airbag - like locating the sensing module & hitting it with a hammer - and even then, you'd have to hit it in the right direction for something to happen (notice how front airbags don't go off when you're hit in the side or rear? Likewise side airbags don't go off in a straight line hit up the ass of the car in front, but he fronts do?) The airbag sensing modules in modern cars are often located in the cabin (a much friendlier environment for electronics) and are only triggered by larger impacts that generate significant G-forces. Sheesh, reading these comments it's like people think there's this magical little spring loaded sensor behind the front bumper that if you so much as touch it the airbags go off.
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