Abstract:Topological-reinforcement and material-strengthening were used and employed to improve the mechanical properties of lattice truss sandwich structures. This new type of three-dimensional aluminum alloy lattice truss (named enhanced lattice truss) sandwich structure, with a relative density ranging from 1.7% to 4.7%, was designed and fabricated by interlocking and vacuum-brazing method. The out-of-plane compression and shear properties of the enhanced lattice truss sandwich structures (both as-brazed and age-har… Show more
“…14a and 14c, failure tends to concentrate in shear bands, which correspond to the maximum shear planes direction. Another failure mode observed in this kind of structures is the local buckling of the struts [15], also identified in lattice sandwich structures under compression [19]. The presence of longitudinal or transverse bars only implies a transverse fracture path (see fracture under compression in Fig.…”
Section: Stress-strain Tension Curves and Fracture Pathsmentioning
confidence: 66%
“…as vibration isolation [10] or energy absorption in blastloading test [17]. For these purposes, the combination of lattice structures and sandwich panels can be a practical solution to improve the classical sandwich-composite structure [18,19]. The study of porous structures has also motivated several investigations [20][21][22][23][24].…”
“…14a and 14c, failure tends to concentrate in shear bands, which correspond to the maximum shear planes direction. Another failure mode observed in this kind of structures is the local buckling of the struts [15], also identified in lattice sandwich structures under compression [19]. The presence of longitudinal or transverse bars only implies a transverse fracture path (see fracture under compression in Fig.…”
Section: Stress-strain Tension Curves and Fracture Pathsmentioning
confidence: 66%
“…as vibration isolation [10] or energy absorption in blastloading test [17]. For these purposes, the combination of lattice structures and sandwich panels can be a practical solution to improve the classical sandwich-composite structure [18,19]. The study of porous structures has also motivated several investigations [20][21][22][23][24].…”
“…A lot of research has been done on the performance of different types of cores and various classifications have been presented by researchers. Figure 3 shows the main types of sandwich cores: foam [19,20], z-pinned [21], corrugated [22,23], lattice [24,25], balsa [26,27], cork [28,29], and composite [30,31]. Figure 3.Classification for sandwich cores.…”
In recent years, concerns about environmental pollution have led to the development of natural fiber sandwich structures as alternatives to petroleum-based ones. This paper reviews various studies on sandwich structures composed of non-wood cellulose-nature fibers. These fibers mainly include flax, hemp, jute, kenaf, sisal, coir, and bamboo. The studies are classified based on the type of fibers, the components in which they are used, and experimental tests/numerical investigations. Furthermore, a few suggestions for future research in the field of eco-friendly sandwich structures are made.
“…Sandwich structures with lightweight lattice cores have been widely employed in aerospace, warships, automotive vehicles and other high energy consumption equipment fields, due to their high specific strength, energy absorption and fatigue resistance, as well as potential multi-functionality [1–4]. Compared with traditional sandwich cores, such as metal foam, honeycomb, corrugated and rib stiffened plate, the stretching-dominated lattice truss cores generally show more excellent mechanical property [5–8], especially for low-density carbon fiber composites. Moreover, researches [9–11] suggest that 3D-Kagome cores has higher strength, buckling resistance and impact energy absorption than other classical ones.…”
Composite lattice cores sandwich structures have shown obvious advantages in specific mechanical property and potential multifunctional integration. 3D-Kagome lattice core is regarded as a classic core configuration with relative optimal theoretical performance. However, it is still unavailable due to preparation problem of the overlap joint-node of composite cores. In this paper, a self-locking mortise-tenon joint method is presented to sucessfully fabricate the integrated 3D-Kagome cores with the expected mechanical properties. The out-of-plane compressive behaviour and energy absorption characteristics are experimentally studied. For the composite structures with various relative densities, three kinds of compressive curves are observed, following by different failure modes. An obvious bearing reinforcement emerges for the lattice cores with high relative density. As the length-to-thickness ratio of the core-rods increases, the initial peak strength and modulus of structures both decrease with a slowing rate. Though the mortises weaken the load-bearing capacity of core-rods, the active constraint of mortise-tenon joint suppresses an obvious degradation. The dominated failure more depends on the core-height than rod-thickness. The composite 3D-Kagome cores show more excellent mechanical properties than other similar structures, especially for the elastic strain before the initial peak stress. The semi-rigid power-wasting mortise-tenon joint and load-bearing characteristics of Kagome core together provide a large deformation tolerance at a relatively high stress level. All suggest that the presented 3D-Kagome lattice cores could be considered as a potential energy absorbing material.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
