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Message: <blockquote data-quote="Redd" data-source="post: 69229" data-attributes="member: 200">this is an interesting debate. i hope u all dont mind if i explore a bit more on this. purely academic, of course. i am neither for nor against foaming. in fact, im a strong supporter of the "different strokes for different folks" movement. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />right, foaming as pertaining to structural stability. both lee and necc have valid concerns and points, but too little is known about the foam to say if either one or the other is rights. bear with me.crumple zones exist to absorb crash energy and to redirect that energy away from the passenger capsule where it might cause injury. they dont crumple just cos the car manufacturer decided they would like to sell u more spare parts. a lot of energy is expended when "deforming" a structure, ie crumpling it. this energy is then not transmitted to the cabin where it can cause harm.so will foam in these crumple structures negatively affect rigidity of the structure that it will not crumple as designed? its certainly possible, but without knowing the material properties of the foam, its impossible to tell. for all we know, the foam can cure so hard that it becomes like steel, unneccesarily stiffens the crumple structure causing it not to deform - or deform insufficiently - and transmit crash shock into the passenger cabin. this is the necc's argument.alternatively, it is entirely possible that the molecular structure of the foam has a relatively weak atomic bond. then it is likely that the foam can actually help absorb crash energy by disintegrating in a crash - the disintegration absorbs crash energy to break the bonds between the foam molecules - and can help reduce crumple damage in the structure and still divert crash energy away from the cabin.it is not difficult to create a foam material with a very specific shear property whereby the molecules separate and the foam disintegrates when it encounters a certain amount of force - higher than chassis flexing force, but lower than crash force.but we dont know enuff about the foam to say one way or another. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />redd</blockquote>

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