Flexural test of Fiber-Reinforced Plastic Composites

ISO 14125, ASTM D6272

ISO 14125, ASTM D6272

Flexural test of fiber-reinforced plastic composites

Various types of fibre composites are used in technological applications, as: 

  • Glass fibre reinforced plastics  
  • Carbon fibre reinforced plastics
  • Aramid fibre reinforced plastics   
  • Natural fibre reinforced plastics   

Fiber-reinforced composites consist of fibers in the form of threads or staple fibers (as roving) and a matrix providing the adhesion. 3 and 4 point flexure tests are very common for their easy execution. Flexure can be measured by the crosshead stroke encoder when the machine deformation is compensated.

Specimen features is largely determined by the fiber orientation in the fabric. For testing technology requirements, a distinction is made between unidirectional and multidirectional laminates. Material tests represent individual load scenarios on standardized specimens. Due to strong directional sensitivity, the various load types are applied using different specimens, for example in longitudinal and transversal way with respect to the direction of the main fiber.  

In addition to ISO and ASTM international standards, these tests are described in various corporate norms (Airbus AITM, Boeing BSS).

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Diversi tipi di compositi in fibra vengono utilizzati nelle applicazioni tecnologiche, fra cui: Plastiche rinforzate con fibre di vetro; Plastiche rinforzate con fibre di carbonio; Plastiche rinforzate con fibre aramidiche; Plastiche rinforzate con fibre naturali
Le prove di flessione a 3 e 4 punti sono molto comuni in quanto di facile esecuzione. La flessione può essere misurata con l'encoder della corsa della traversa quando la deformazione della macchina è compensata
I compositi rinforzati con fibre sono costituite da fibre sotto forma di filamento o fibra in fiocco (come per esempio il roving) ed una matrice che fornisce la forza di adesione