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Analiza wytrzymałościowa MES podłogowych paneli grzejnych poddanych obciążeniom eksploatacyjnym

Kosiuczenko Krzysztof, Barnat Wiesław, Ciepielewski Radosław, Dybcio Paweł, Jagusiak Bogusław

Modelowanie Inżynierskie

2019

T. 39, nr 70

56--61

Celem niniejszego artykułu była realizacja analizy wytrzymałościowej nowego systemu ogrzewania podłogowego wykorzystującego modułowe panele grzejne nowej generacji. Praca obejmowała analizę wpływu termicznych obciążeń eksploatacyjnych na właściwości mechaniczne paneli grzejnych. Realizowana była metodami numerycznymi z zastosowaniem metody elementów skończonych w programie PLM Femap oraz LS Dyna. Do zamodelowania właściwości materiałowych drewna użyto m.in. modelu materiału ortotropowego pn. Wood ( nr 143).

The aim of this work was to carry out strength analysis of a new underfloor heating system using modular heating panels. The work included the analysis of the impact of thermal operating loads on the mechanical properties of new generation heating panels. It was implemented using numerical methods using the Finite Element Method in the PLM Femap program and LS Dyna. The material model Wood (143) available in the LS Dyna program was used to model wood material properties.

Out-of-plane static crushing of thin-walled honeycomb structures. Numerical and experimental investigation

Ciepielewski Radosław, Dybcio Paweł, Barnat Wiesław

Advances in Science and Technology. Research Journal

2018

Vol. 12, no 3

96--105

Aim of presented study was to compare plateau stress in honeycomb structures under out-of-plane load calculated using Wierzbicki formula with numerical simulations validated using experimental trials. ALUBOND® Alucore honeycomb structure was examined. The results of theoretical, experimental and numerical investigation are reported. Two methods of modeling core behavior were evaluated using simulations. Full core geometry and simplified Y-shaped element were analyzed. Both approaches were compared with experimental out-of-plane compression tests. Aim of the study was to determine the influence of core geometrical parameters on obtained plateau stress value. Various foil thicknesses and cell sizes were studied numerically. The results showed, that initial and final deformation mode strongly depends on the geometry of the honeycomb structure. Force required to crush the core grew with increase of wall thickness, and decreased with increase of cell size. Calculations were performed using an implicit integration scheme implemented in the LS-DYNA software. Research showed the presence of plateau relationship between stress and geometric dimensions and structure response. Good agreement between results obtained by all methods was achieved. Basing on the results, conclusions concerning modeling honeycomb materials were drawn.