Thin-walled structures have been used in many fields due to their superior mechanical properties. In this paper, two types of hierarchical multi-cell tubes, inspired by the self-similarity Pinus sylvestris, are proposed enhance structural energy absorption performance. The finite element models established validate crashworthiness performance under axial dynamic load. theoretical model mean cru...

The paper presents the possibility of neural network application in order to identify most advantageous design variants column energy absorbers terms achieved absorption indicators. Design absorber made standard thin-walled square aluminium profile with triggers form four identical cylindrical embossments on lateral edges were considered. These differ diameter trigger, its depth and position. g...

Abstract We describe here the quasi-static crushing behavior of novel classes multiphase (hybrid) hierarchical lattice metamaterials. The first class is represented by a hybrid architecture combining honeycomb with polyurethane foam filler, while second structure produced injecting an alginate hydrogel into voids metamaterial. Twelve different auxetic (i.e. negative Poisson’s ratio) and non-aux...

The 2.5D (2.5-dimensional) structures are acquired to enhance safety and lightweight designs with better energy absorption in the aerospace automobile sectors. Additive manufacturing (AM), which is practical build suitable components industrial transportation applications, may produce these more efficiently. current study aims improve infilled mean crush force (MCF) capabilities. Under compress...

The traditional method in Iran of cracking walnut manually, using harmer or knife cutter is laborintensive, slow and tedious; besides, most mechanical crackers do not give satisfactory results in terms of kernel extraction quality. A prototype machine was developed to crack walnut. A walnut cracker was designed, constructed and tested to evaluate its performance. The cracker, which consists of ...

Environmental and occupational health concerns will have an effect on the developing oil shale technologies. The mining and crushing of large volumes of rock will be a characteristic of at least some of these technologies, and above ground disposal of proceessed shale will require adequate control measures. Exposure by inhalation to the dusts that may arise from shale oil technologies may prese...

Based on the mechanical test (shear test, compression test), bond model of corn kernel and straw was established to explore rolling crushing effect different rollers. The type roller is different. material process by force (extrusion kneading) analysis reveals that disc (DCR) has characteristics large unit-length kneading area; spiral-notched serrated (SNSCR) transverse shearing material; they ...

In this article, crashworthiness performance and crushing behavior of tapered structures with four internal reinforcing plates under axial and oblique dynamic loadings have been investigated. These structures have a tapered form with five cross sections of square, hexagonal, octagonal, decagon and circular shape. In the first step, finite element simulations performed in LS-DYNA were validated ...

Please cite this article in press as: Ajdari, A., et a Int. J. Solids Struct. (2010), doi:10.1016/j.ijsolst The in-plane dynamic crushing of two dimensional honeycombs with both regular hexagonal and irregular arrangements was investigated using detailed finite element models. The energy absorption of honeycombs made of a linear elastic-perfectly plastic material with constant and functionally ...

In this article, the results of a study on energy absorption characteristics of foam-filled thin-walled structures with finite element analysis have been presented. Four specimens of thin walled structures have been filled with uniform foam and three specimens have been filled with linear four-layered foam. Also, eight layers HLH (High-Low-High) and eight layers LHL (Low-High-Low) have been sim...