Dynamic Mechanical Analysis (DMA)

This technique is useful for evaluation of the mechanical properties under different modes of loading, e.g. under shear loading the complex shear modulus can be attained; and under tensile loading conditions the storage and loss modulus can be determined. Electrospun poly(l-lactide) (PLA) fibres with a poly(lactide-co- ethylene oxide fumarate) hydrogel was fabricated using multilayer laminates, which was tested using DMA at 37 °C. The compressive modulus of the composite hydrogel was determined under wet and dry conditions and compared with the pure equivalent. The composite hydrogel demonstrated a compressive modulus of 575 ± 14 MPa when wet, which was significantly higher than the pure hydrogel (A = 4.1) and slightly greater than the dry composite [33]. Various other methods have also been used, such as shear friction test [30], notched tension test [30], suture retention tests [22, 23], dielectric property tests [19], spherical indentation [28, 34], fibre pullout tests [19] and monotonic and cyclic strain tests [35, 36]. Irrespective of test method, the amplification factor (A) allows for a relatively straightforward metric demonstrating the extent to which the inclusion of a reinforcement material has on the mechanical properties of a composite.

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