Current Issue : April-June Volume : 2025 Issue Number : 2 Articles : 5 Articles
In the damage tolerance analysis of aircraft panels, it was necessary to frequently apply complex boundaries and loads to simulate crack propagation. It was difficult to simulate crack propagation with the conventional finite element method. In this paper, a convenient method for crack propagation simulation in thin-walled structures was proposed. This method combined the extended finite element method (XFEM) and level-set method (LSM). Crack insertion, analysis, result extraction and automatic propagation were realized through the secondary development script in the ABAQUS platform. A specimen with a single center crack was simulated to study the crack propagation behavior under tensile and bending conditions. Also, multiple-crack propagation was simulated. The present work shows that the developed method can not only take the complex loading and boundary conditions into account, but also can give good predictions on the crack analysis. This method provided a convenient and effective secondary development of ABAQUS to solve complex crack problems....
Recent developments in offshore renewable energy facilities, such as wind turbines and photovoltaic generators, often face challenges posed by the harsh offshore environments to which these structures are exposed. To ensure the continuous operation of these facilities, reliable numerical methods are urgently needed to capture the dynamics of ocean waves and their complex interactions with large-scale offshore structures. With the development of computational fluid dynamics techniques, advanced algorithms have been proposed to capture the complex fluid–structure interactions (FSI) in offshore applications. Although a variety of such algorithms have been introduced, a comprehensive review of all the latest developments in numerical modeling has not been available in the literature. To address this gap, this paper reviews recent numerical schemes and algorithms for dealing with FSI problems for offshore structures. The difficulties and challenges faced by recent algorithms are summarized, and future directions for advancing research into FSI in the offshore renewable energy field are also discussed....
Globalization has become the main element of business life today and leads to increased competition. The main factors affecting competition in the oil and gas industry are oil/ natural gas prices and demand, exploration and production costs, global production levels, alternative fuels, and government (including environmental) regulations. This scope of work, It deals with the characteristics, design and manufacturing parameters of the fixed offshore platform and the types of platforms used to drill and produce oil/ natural gas under the sea. Especially the formation stages of fixed offshore platform projects are mentioned. Various analyzes need to be made in the process from the decision taken in the construction of the fixed offshore platform, from its design to the manufacturing phase and the time of installation. As in offshore designs, these analyzes should be aimed for other platform structures to build an economical and reliable structure....
To address the technical challenges in detecting internal cracks within aircraft metallic multilayer structures, we have employed the environmentally friendly detection technique of remotefield eddy current (RFEC). Through theoretical analysis and experimental research, we have analyzed influencing factors such as frequency and phase, designed detection probes and reference blocks, and conducted research on the capability of detecting concealed defects within thick structures (greater than 10 mm). By testing the reference blocks, we have studied the changes in phase and amplitude caused by variations in frequency and damage, gaining insights into the detection capabilities and applicable scope of this method. Ultimately, we have obtained an effective method for detecting internal cracks within different thickness layers of metallic multilayer structures....
This study focuses on the effect of soil-structure interaction on the occurrence of progressive collapse due to an external blast. Therefore, a 3-story fixed base steel moment-resisting frame structure was first modeled and subjected to an external blast load. Then, the same structure was modeled considering soil-structure interaction. In another stage of this study, the effect of plan irregularity on progressive failure resulting from the explosion was investigated, assuming the presence or absence of soilstructure interaction. The direct simulation method and alternative load path method are all employed to simulate the progressive collapse process of steel frames using the commercial finite element program LS-DYNA. The results of the numerical simulations demonstrated that the presence of soil-structure interaction, significantly influences the response of the structure to the blast and this interaction increases the likelihood of progressive failure occurring even at symmetric and asymmetric structures. It was also shown that silty sand soil yields more critical conditions than other types of soil in the event of failure after the occurrence of an explosion in the structure....
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