In this study, the effects of heat treatment of aluminum alloy on the tube bending process were investigated in the rotary draw bending process. As two experimental and numerical simulation methods were used to determine the wall-thinning, ovality, and spring back for extruded, annealed, and aged AA6063 aluminum alloy tubes in different bending angles and bend radii. Numerical simulations were ...

In the wave pattern of a flagellum generating planar undulatory bending waves, bending and unbending are represented by rather abrupt transitions between bent and unbent states (Brokaw & Wright, 1963; Brokaw, 1965). The magnitude of these transitions is indicated by the radius of curvature of the bent regions of the wave pattern, but their detailed time course cannot be resolved. The propagated...

Sexual selection and aerodynamic forces affecting structural properties of the flight feathers of birds are poorly understood. Here, we compared the structural features of the innermost primary wing feather (P1) and the sexually dimorphic outermost (Ta6) and monomorphic second outermost (Ta5) tail feathers of barn swallows (Hirundo rustica) from a Romanian population to investigate how sexual s...

this paper is about discrete sensitivity analysis. a triangular bending element with constant moment and six degrees of freedom is used. the required derivatives for sensitivity analysis are calculated explicitly. these formulations, finite element method and sequential linear programming are utilized to find shape optimization of plate bending structures. the numerical examples, which show the...

In this study, a textile-based flexible temperature-sensing fabric is designed. Organization of the stitching double weaves arrangement, and continuous temperature-sensitive Pt fiber embedded into woven through common weaving technology. The design double-layer structure forms relatively stable protection for fibers, which greatly improves durability fabric. Through experimental tests that simu...

Sandwich panels are used in many industries for their lightweight compared to high strength. Most of the sandwich application bending and compression, which relies on core type panel. Widely additive manufacturing is pyramid cell cores. In this article, two new cores, reinforced model C-half circle model, proposed replace pyramidal verify advantages disadvantages with respect it compression ben...