Henan University of Technology

About: Henan University of Technology is a education organization based out in Zhengzhou, China. It is known for research contribution in the topics: Catalysis & Starch. The organization has 7648 authors who have published 6503 publications receiving 73067 citations. The organization is also known as: Hénán Gōngyè Dàxué.

Tunable compressive properties of a novel auxetic tubular material with low stress level

Abstract: The auxetic tubular materials have attracted wide attention owing to their unusual mechanical properties and potential applications in designing foldable devices. However, most of auxetic tubular structures designed by incorporating re-entrant, chiral or penetrated microstructures remain great challenging in stress concentration because of the presence of shape corners in these structures. In this study, a novel auxetic tubular structure is designed by incorporating the smooth peanut-shaped hole pattern and then is fabricated via 3D printing technique. Subsequently its mechanical properties and deformation characteristics are investigated by uniaxial compression experiments and finite element simulation. Results reveal that the designed tube exhibits significant auxetic performance under compression and the stress level within the structure is significantly reduced, in contrast to the auxetic tubular structure with orthogonal elliptical hole pattern. Finally, the effect of controlling parameters of the designed auxetic tubular structure on Poisson’s ratio is studied to better understand its auxetic behavior and also provide tunable design of auxetic tubular structures.

The (σ,S) policy for uncertain multi-product newsboy problem

Abstract: This paper derives an optimal (@s,S) policy for uncertain multi-product newsboy problem. Demands for the products are estimated by experts and assumed to be independent uncertain variables. Uncertainty theory, which is a new mathematical tool to deal with human uncertainty, is employed to model demand distributions. A fixed setup cost and a linear ordering cost are incurred if products are ordered. Setup cost is variant and depends on whether a joint order or an individual order is placed. A methodology is proposed for determining the optimal (@s,S) policy. Finally, a two-product example is provided to show how to design an optimal (@s,S) policy in realistic situation.