Numerical Crush Analysis of Thin-Walled Aluminium Columns with Square Cross-Section and a Partial Foam Filling

Ferdynus, Mirosław; Rogala, Michał

doi:10.12913/22998624/110611

Cited by 14 publications

(7 citation statements)

References 17 publications

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“…The ratio between anchor spacing (the smallest distance between the anchor axes) and the effective embedment depth is commonly singled out as a crucial factor to consider in the analysis of the group effect in cone failure [ 5 , 18 ]. Frequently, the research works in the field are computer-aided and utilize the FEM ABAQUS system, which is commonly used to describe failure mechanics [ 34 , 35 , 36 , 37 , 38 , 39 ]. The load-carrying behavior of multi-fastener anchorage systems and the theoretical mechanism of concrete rupture subject to various complex loading conditions has been explored in the works of Hüer et al and Tsavdaridisin et al [ 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Rock Failure Cone Size Relative to the Group Effect from a Triangular Anchorage System

et al. 2020

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This study employs the numerical analysis and experimental testing to analyze the fracturing mechanics and the size of rock cones formed in the pull-out of a system of three undercut anchors. The research sets out to broaden the knowledge regarding: (a) the potential of the undercut anchor pull-out process in mining of the rock mass, and (b) estimating the load-carrying capacity of anchors embedded in the rock mass (which is distinctly different from the anchorage to concrete). Undercut anchors are most commonly applied as fasteners of steel components in concrete structures. The new application for undercut anchors postulated in this paper is their use in rock mining in exceptional conditions, such as during mining rescue operations, which for safety considerations may exclude mechanical mining techniques, mining machines, or explosives. The remaining solution is manual rock fracture, whose effectiveness is hard to assess. The key issue in the analyzed aspect is the rock fracture mechanics, which requires in-depth consideration that could provide the assistance in predicting the breakout prism dimensions and the load-displacement behavior of specific anchorage systems, embedment depth, and rock strength parameters. The volume of rock breakout prisms is an interesting factor to study as it is critical to energy consumption and, ultimately, the efficiency of the process. Our investigations are supported by the FEM (Finite Element Method) analysis, and the developed models have been validated by the results from experimental testing performed in a sandstone mine. The findings presented here illuminate the discrepancies between the current technology, test results, and standards that favor anchorage to concrete, particularly in the light of a distinct lack of scientific and industry documentation describing the anchorage systems’ interaction with rock materials, which exhibit high heterogeneity of the internal structure or bedding. The Concrete Capacity Design (CCD) method approximates that the maximum projected radius of the breakout cone on the free surface of concrete corresponds to the length of at the most three embedment depths (hef). In rock, the dimensions of the breakout prism are found to exceed the CCD recommendations by 20–33%. The numerical computations have demonstrated that, for the nominal breakout prism angle of approx. 35% (CCD), the critical spacing for which the anchor group effect occurs is ~4.5 (a cross-section through two anchor axes). On average, the observed spacing values were in the range of 3.6–4.0.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Rock Failure Cone Size Relative to the Group Effect from a Triangular Anchorage System

et al. 2020

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“…Originally, the structures were filled with additional walls inside [10,11]. However, due to the high stiffness in the impact direction, the multi-cell structures were replaced with metal foams [12][13][14]. The foams of metals compared to the foams of polymers have different characteristics of damage to the structure, consequently, they absorb mechanical energy to a different extent [15].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Assessment of Aluminum and Aluminum-Ceramic Foams Structure

Rogala¹,

Tuchowski²,

Czarnecka‐Komorowska³

et al. 2022

Adv. Sci. Technol. Res. J.

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The paper presents an analysis of the aluminum porous structure serving as a structural material used in the automotive or marine industry. The subject of the research is the analysis of the mechanical properties of the aluminum porous structure, in particular its ability to absorb energy in comparison with quality of manufactured porous structures. The paper presents a description of the manufacturing process, quality control in the form of a statistical capture of geometric parameters of the foam made, as well as an X-ray microanalysis of the chemical composition of EPMA-EDS and the dispersion of components within the structure. In addition, results of static axial compression analysis of aluminum and composite foam specimens are presented.

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“…In many studies, the authors focused on maximizing the amount of energy absorbed by a thin-walled structure concerning its SEA mass; in this case, it was easily achieved by using multi-cell [22,23] or bi-tubular [24,25] thin-walled profiles, also filled with foam of an appropriate density [26,27] or honeycomb [28][29][30] structures. The use of multi-cell structures is a solution that is becoming more popular; however, such solutions do not usually fulfill an important condition set for biomechanical reasons, namely the minimization of overload that occurs during crushing.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Different Length Aluminum Foam Filling on Mechanical Behavior of a Square Thin-Walled Column

et al. 2021

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The demand for lightweight, strong structural profiles is currently high in the transport industry, mechanical engineering, and construction. Therefore, it is important to evaluate their properties, especially mechanical properties. The main objective of this paper is to determine energy absorption coefficients and evaluate the crush resistance of thin-walled aluminum profiles using numerical simulation and empirical verification. This paper presents the compression results of testing of thin-walled aluminum profiles filled with a porous material (cast aluminum foam). The numerical analysis was conducted using the software Abaqus/CAE. Aluminum material data were obtained from a static tensile test performed on a Shimadzu machine. The experiment was performed on an Instron CEAST 9450HES dynamic hammer. Profiles with three shapes of crush initiators filled with aluminum foam measuring 40 mm–200 mm in 20 mm increments were numerically tested. A sample with a concave initiator filled with foams of 40 mm, 60 mm, 80 mm, and 120 mm in length was used to verify the numerical analyses. Energy absorption coefficients were determined from the analyses. The results of both analyses were tabulated to show the percentage differences. The study showed an increase in the Crush Load Efficiency (CLE) index by up to 33% for samples with the same crush initiator. In addition, it was noted that the use of porous fill does not increase the value of initiating Peak Crushing Force (PCF), which indicates the generation of much smaller overloads dangerous for vehicle passengers.

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Numerical Crush Analysis of Thin-Walled Aluminium Columns with Square Cross-Section and a Partial Foam Filling

Cited by 14 publications

References 17 publications

Analysis of the Rock Failure Cone Size Relative to the Group Effect from a Triangular Anchorage System

Analysis of the Rock Failure Cone Size Relative to the Group Effect from a Triangular Anchorage System

Analysis and Assessment of Aluminum and Aluminum-Ceramic Foams Structure

The Influence of Different Length Aluminum Foam Filling on Mechanical Behavior of a Square Thin-Walled Column

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