The porosity variation in an otherwise single phase material mimicks the architectural microstructure design of sea urchin spines of Heterocentrotus mammillatus, which are promising model materials for impact protection.
Furthermore, UHPFRC has also been considered as one of the promising materials for impact- and blast-resistant structures, because of its enhanced strength and energy absorption capacity, along with strain-hardening cementitious composites containing polymeric fibers (Astarlioglu and Krauthammer 2014; Choi et al. 2014).
Increasingly, it is recognised that the abundant resources of evolutionized biological materials and structures provide an exciting opportunity for growth in the area of materials engineering for impact and projectile resistance.
In contrast to other structured materials used for impact mitigation, these networks exhibit reversible deformation, function over all frequencies, and possess a low relative density.
The test results indicated that the dynamic stiffness of the resilient materials for floor impact sound increased with time, and that the variation of the dynamic stiffness was affected by loading time, weight of loading, and material properties.
Unlike Matthew Brady, whose photographs were sometimes Homer's source material, the artist could revise, combine and emphasize material for maximum graphic impact, as in "Wheel of Time," his post-war summary of recent history.
An enhanced thermoset polymer matrix with randomly distributed carbon nanofibers (CNFs) is combined with conventional long fibers to form a hybrid composite material for application to impact energy absorbing components.
The migrants had lived in the UK for 1 13 years and were at different stages of their lives; the samples included 5 postgraduate students and 27 post-education migrants; 14 were married and 19 were unmarried.4 That the respondents were at different stages in their career and marital status provided further material for analysing the impact of the life cycle on transnational families.
Current exposure to climate variability; extreme events such as the 1998 and 2002 temperature anomalies and bleaching; and Tropical Cyclones Hamish and Yasi illustrate the potential consequences of moderate climate change impacts on the region's coastal ecosystems (see Supplementary material for references on impacts from distinct drivers on corals, fish and mangroves).
Polymeric foam materials are widely used for impact protection and energy absorption, for which advanced design and modeling requires appropriate material characterization data and constitutive models.
