This paper presents the experimental and numerical investigation of angled shape metal plates response when subjected to an air blast loading. V shaped plates were fabricated at angles of 90º, 120º and 150º respectively. The charge weight of 1 kg (PE4) was used to create a spherical blast wave at several standoff configurations. The experimental r compared with the numerical simulation model computed using LSDYNA3D.
People need durable shelters for living safely due to devastation caused by flooding in some areas, and it is not easy to mitigate the frequency and intensity of the flooding. Therefore, in this research, an industrialized building system (IBS) has been proposed as one of the best solutions. However, most of the existing IBSs were not designed and tested for resisting a sudden horizontal impact. Furthermore, the joints of some IBSs would likely be vulnerable to failure when subjected to a horizontal impact. There is a need to develop a bolt-connected IBS that is able to withstand a horizontal impact load. Thus, this study aimed to investigate the performance of steel-bolt-connected IBS frames subjected to the sudden impact of hydrodynamic force. Autodesk computational fluid dynamic (CFD) simulation was used for optimizing the laboratory experiment. A 1:5-scale IBS frame was designed and tested for the dam-break test using 1 m, 2 m, and 3 m reservoir water levels. The results showed that the bolt connections were very effective and robust in the IBS frame. They also restricted damages from spreading to other structural components due to energy dissipation. The main findings of this study are crucial to improving the current IBS method of construction.
This paper investigates the performance of design of experiment (DOE) in response surface methodology (RSM) for vibration-based damage detection. The ability of three major types of DOE, namely central composite design (CCD), Box-Behnken (BBD) and D-optimal (Dopt) for damage detection based on modal frequency are investigated and compared. A procedure comprising three main stages—sampling, response surface (RS) modelling and model updating—are employed for damage localisation and quantification. By considering Young’s modulus and modal frequency as respective input and output, a set of samples is generated from each DOE. Full quadratic functions are considered in RS modelling while model updating is performed for damage detection. The performances of DOE are compared based on damage detectability. A numerical simply supported beam is used as case study by considering several single damage cases. The results show that CCD provides better prediction compared to other DOEs.
The hypothetical human exploration and inhabitation on Mars would certainly be difficult as the planet itself is vulnerable to the outer space radiation. The outer space radiation consists of the solar particle events (SPEs) that could easily penetrate the very thin atmospheric layers on Mars. Since sulfur concrete is identified as the feasible in situ building material on Mars, its radiation shielding capability is yet to be clarified. Here we report the preliminary radiation shielding properties of the Martian sulfur concrete composed of elemental sulfur and silica with the latter identified on Mars and incorporated by previous related studies upon irradiation with gamma rays generated from the Iridium-192. It is found that the Martian sulfur concrete demonstrated an approximately 50% efficiency upon irradiation. Martian sulfur concrete demonstrated a high potential in radiation shielding capability as well as the structural integrity post irradiation.
Water-cement ratio plays a unique role in concrete structures. The uniqueness of evaluating concrete from the perspective of the water-cement ratio will be more obvious if the structure is being assessed down into its microscale level. It is important to realise that most dynamic concrete structures are hydro-related structures, and those structures need to be designed as detail as possible. Thus, the design of dynamic concrete structures has to incorporate accurate fatigue formulation and precise water-cement ratio variation effect. Currently, one of the most simplified yet accurate formulations proposed to run fatigue cases throughout a wide spectrum of scope is the Theory of Critical Distances (TCD). Therefore, the article reviews and discusses the precision of TCD towards the water-cement ratio perspective.
This paper presents a study on blast wave propagation in a soil structure when subjected to a surface air blast loading. The experimental work utilized the use of plastic explosive of 1 kg weight (PE4) in order to create a spherical blast wave at a fixed s experimental results were then compared with the numerical simulation model computed using LSDYNA3D. Although the computed simulation and experimental results showed large difference in terms of values, overpressure.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.