Why composites in form of laminates

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Composites are constructed in the form of laminates to enhance their mechanical properties, as individual laminae are too thin and ineffective alone. Laminates allow for the customization of material properties to better withstand specific loads and machining processes. The orientation of the fibers within the laminates plays a crucial role, as they significantly contribute to the overall strength of the material. A unidirectional laminate, while strong in one direction, lacks the multidirectional strength provided by layered laminates. This design approach maximizes performance and adaptability in composite materials.
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why composites are built in form of laminates(laminas with various orientation)?. why can't
a single lamina serve the purpose?

how a single laminate property is different from a single lamina property
 
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Lamina plys are very very thin, on the order of, say 100 micrometers. They are not very effective on their own. The other bog reason is that material properties can be custom formed to the expected loads the part will see or how the part is expected to be machined.

Also remember this...the major contributor to the strength of the material is the fibers. Therefore you can have a unidirectional laminate, but that really provides you strength in one direction only.
 

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