Abstract
In this study, a new type ternary composite, called warp-knitted spacer fabric reinforced syntactic foam (WKSF-SF), with the advantages of high mechanical properties and a lower density, was proposed. Then, a meso-mechanics theoretical model based on the Eshelby–Mori–Tanaka equivalent inclusion method, average stress method and composite hybrid theory was established to predict the compression modulus of WKSF-SF. In order to verify the validity of this model, compression modulus values of theoretical simulations were compared with the quasi-static compression experiment results. The results showed that the addition of suitable WKSF produces at least 15% improvement in the compressive modulus of WKSF-SF compared with neat syntactic foam (NSF). Meanwhile, the theoretical model can effectively simulate the values and variation tendency of the compression modulus for different WKSF-SF samples, and is especially suitable for the samples with smaller wall thickness or a moderate volume fraction of microballoons (the deviations is less than 5%). The study of the meso-mechanical properties of WKSF-SF will help to increase understanding of the compression properties of this new type composite deeply. It is expected that WKSF-SF can be used in aerospace, marine, transportation, construction, and other fields.
Highlights
Syntactic foams are defined as closed pore foams which are formed by embedding hollow microballoons into matrix [1]
The results indicated that the warp-knitted spacer fabric reinforced syntactic foam (WKSF-SF) made of preferable Warp-knitted spacer fabric (WKSF) showed a higher compressive modulus and yield strength compared to neat syntactic foam (NSF)
It can be seen from the figure that, a slight underestimation occurs, the prediction model can accurately predict the decreasing trend of the compression modulus for SWS60-30-W1, SWS60-30-W2 and SWS60-30-W4
Summary
Syntactic foams are defined as closed pore foams which are formed by embedding hollow microballoons into matrix [1]. Syntactic foams exhibit excellent properties, such as low density, high specific strength, high specific modulus and the possibility of tailoring mechanical properties by adjusting the types, as well as the volume fractions of microballoons [3]. Have reported that the absolute strength of traditional syntactic foams is still insufficient, which severely limits further development of this composite. Warp-knitted spacer fabric (WKSF) is a type of three-dimensional textile material, which consists of two separate surface layers joined together by spacer yarns [8]. As a rapidly developing textile material in recent years, WKSF shows excellent compression, impact resistance and cushioning properties. Adding WKSF into composite can effectively improve the interlaminar shear
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