Anisopropic properties

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Anisopropic properties

Author	Message
haris3384	haris3384 posted 11 Years Ago HOT Topic Details
Group: Forum Members Posts: 2, Visits: 47	Hello, How to get the anisotropic properties ,(D1111, D1112, D2222 .... etc) which are 21 engineering constants , for composite laminate. are these the elements of ABD matrix??? Tags anisotropic laminate properties
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LaxFriedrichs	LaxFriedrichs posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 58, Visits: 450	This seems analogous to a relation in fluid dynamics I'm familiar with - I'll read up on this and get back to you. My intuition says that your tensor should not be assumed to be symmetric for an anisotropic material. I think the relation that you give is for isotropic materials, as these by definition should be have a symmetric tensor. So your matrix will have 36 elements that each must be considered, not just the upper or lower diagonal (21 elements). Will get back to you! Edit: Thinking about this I can't be sure of the above Edited 11 Years Ago by LaxFriedrichs
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haris3384	haris3384 posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 2, Visits: 47	This tensor is for general anisotropic linearly elastic material. thats why the number of independent elastic coefficients are reduced to 21. these are mostly used to define the anisopropic nature of the material. but my confusion is that how to define them for a composite laminate (multi layer, multi oriented material). For a single unidirectional ply these constants are defined by engineering constants i.e moduli, and Poisson's ratios. But how to defined them for a composite laminate or in other words how these 21 constants will reflect the number of plies and respective orientation of plies. Most FEM codes require these constants to be specified for anisotropic material. but i dont know how to get them.
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