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What does quasi-isotropic mean?

asked 2016-05-10 20:29:28 -0500

Conrad_Marr gravatar image

What does quasi-isotropic mean?

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answered 2016-05-26 08:11:06 -0500

Greg Kress gravatar image

Quasi-isotropic means "almost isotropic", where a quasi-isotropic laminate is isotropic in stiffness in the plane of the material, but not isotropic in strength nor is it isotropic through the thickness or in bending. Quasi-isotropic laminates can be made with both unidirectional and woven fabric plies. Unidirectional quasi-isotropic laminates are made from a c laminate of 0/+60/-60 and 0/90/+45/-45 plies that can be laminated in any order as long as the laminate is symmetric (mirror image about the laminate midplane) and balanced (equal numbers of +angle and -angle plies).

The result is a laminate that has the same inplane stiffness in all directions. However the laminate will not have the same bending stiffness in all directions, nor will necessarily have the same strength in all directions (depending of the failure criteria used). Quasi-isotropic laminates are good for applications where the exact orientation of the load is not known. However, the true benefit of composites is to tailor the strength and stiffness to only directions where it is required, such that a quasi-isotropic laminate may provide stiffness is directions where it is not require, which defeats the purpose of using composites to start with. There is a

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Asked: 2016-05-10 20:29:28 -0500

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Last updated: May 26 '16