engleski

Infrared evaluation of dynamic loaded tubular structural members with cellular fillers

Increasing the carrying capacity of structures without increasing the weight is a constant focus of research and contemporary technology developments. Tubular structural members under tension loading are sensitive to bending and bucking. Inserting lightweight cellular filler in tubular structural member significantly increases loading and energy absorption capacity. Presented work is an overview of the collaboration between the University of Maribor (Slovenia), University of Aveiro (Portugal) and University of Split (Croatia), where numerical and experimental research has been performed. Evaluation of structural response under dynamic mechanical loading conditions has been performed by means of infrared thermography used as a passive method for tracing plastification occurrences in material. Such an approach based on infrared thermography enables better understanding of collapse mechanism and benefits of using cellular fillers. It additionally provides information to standard load-displacement curves. Aluminium tubes, with and without cellular filler, have been subjected to compression and three-point bending dynamic tests. As filler material, Advanced Pore Morphology (APM) spheres [1] and closed cell aluminium foams have been used. Aluminium foam was formed in moulds and inserted in tubes (ex-situ) [2], or foamed directly in tubes (in-situ) [3]. In-situ approach causes better stress redistribution due to bonding between the tube and filler, while exposure to heat results in structural changes of heat treated aluminium tubes. It has been shown that three-point bending test is an appropriate method for evaluation of such structures and comparable with results of numerical simulations [4], what is often not the case for simple compression or tension tests.

Book of Abstracts of the International Conference on Multifunctional Cellular Materials

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