Carbon fiber raw strength vs laminates

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SUMMARY

Raw carbon fiber exhibits a strength of approximately 4000 MPa; however, when incorporated into epoxy laminates, this strength diminishes to around 950 MPa. This reduction is primarily due to the inherent limitations of cured epoxy resin, which typically possesses a flexural or compressive strength ranging from 125 to 140 MPa. Even when epoxy is reinforced with less than 4% carbon fibers, the resulting composite strength improves but remains significantly lower than that of pure carbon fiber.

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violt
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If raw carbon fiber has strength of say 4000 mpa, how come it is reduced when put in epoxy laminate to become only 950 mpa?
 
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Maybe because unreiforced cured epoxy resin is not as strong as the carbon fiber, usually it has flexural or compressive strength 125- 140MPa (commercially avail.) When the epoxy is reinforced with less than 4% of carbon fibers the strength of the composite will be increased in comparison to the epoxy but will not be able to reach the carbon fiber's strength.
Hope this helps.
 

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