looking for good 'materials and design' forums, to consult with people, any ideas?

Hi, just new to this, I am actually in the primary steps of business development. I am wondering whether anyone might know of any online forums where I might be able to discuss materials and design for certain structures I am hoping to complete and eventually sell, to complete them I need new ideas, in materials and structures. Or if they exist at all.

- if anyone knows any forums that come close to this I would most definitely be interested.

thanks

Eddydeedee