Size effect and fracture characteristics of composite laminates

Article Abstract:

The nominal strength of composite laminates shows a significant size effect which is in close approximation to the proposed size effect law. The law states that the curve between the logarithm of the nominal strength and the logarithm of size represents a smooth transition from a horizontal asymptote of the strength criterion to an inclined asymptote of linear elastic fracture mechanics. Size effect law parameters enable determination of the fracture energy and the effective fracture process zone length. Maximum load data helps identify the R-curves for multi-directional laminates.

Composite materials

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Size effect on strength of laminate-foam sandwich plates

Article Abstract:

Experiments on size effect on the failure loads of sandwich beams with PVC foam core and skins made of fiber-polymer composite are conducted examining two test series use beams with matches at the ends cut in the foam near the top or bottom interface and the third series using beams without notches. There is a significant nonstatistical size effect on the nominal strength of the house whether notched or unnotched and this knowledge can be used to identify fracture energy and the effective size of the fracture process zone.

Structural engineering, Mechanical properties, Reinforced concrete, Fiber, Fiber reinforced concrete, Sandwich construction, Fibre reinforced composites

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Size effect on flexural strength of fiber-composite laminates

Article Abstract:

The size effect on the flexural strength of fiber-polymer laminate beams failing at fracture initiation is analyzed. The results show that the new energetic statistical size effect theory can match the existing flexural strength data better than the classical statistical Weibull theory, but the superiority of the energetic-statistical theory so far rests only on theoretical arguments.

Polymers

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