Analysis of Out-of-Plane Hail Impact Resistance of Steel Roof Panels

Uz, Mehmet E.; Kop, M.D.; Yildirim, E.

doi:10.1007/s40799-022-00550-z

Cited by 3 publications

(6 citation statements)

References 17 publications

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“…Some of the tests conducted by Wu 8 are performed in the FE model of this study. Figure 7 shows a comparison between the dent depths determined with the FE models, with the gauges and 3D scans in the study of Wu 8 and with the equation proposed by Uz et al 21 Except for the samples with a hailstone diameter of 25 mm, the results of the FE models are not even in the range of the results measured with gauges and 3D scans. Due to the limited scope of this article, there is only one FE model result presented in Fig.…”

Section: Resultsmentioning

confidence: 88%

“…The tabular representation of the strain sensitivity of the hailstone used in the current study corresponds to the data in the study by Uz et al 21 The strain rate determines the failure of compression.…”

Section: Methods Of Creating Artificial Hailstonesmentioning

confidence: 94%

“…The material property values for hailstones are 9.38 GPa for Young's modulus, 0.33 for Poisson's ratio, 5.2 MPa for yield stress and 0.517 MPa for hydrostatic cutoff stress. The compressive strength of artificial hailstones does not noticeably affect the prediction of the maximum dent depth of steel plates by assuming that the energy conservation (vibration and plastic energy) of hailstones is negligible 21 .

Figure 5 Time histories of impact force obtained by this study in comparison with the one performed by Carney et al 25 .…”

Section: Methods Of Creating Artificial Hailstonesmentioning

confidence: 99%

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Modelling the impact of hailstones on flat steel roofing membranes for residential buildings

2022

Sci Rep

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Metal roof panels are commonly used on residential and commercial buildings. Steel panels exposed to hail have not yet been adequately tested for dent resistance. A finite element model (FEM) was used to analyze the entire test setup. To compare artificial hailstones with natural hailstones, which remained intact after impact, different steel sheets were struck by different sizes of artificial hailstones at different terminal velocities. The simulation and the material properties are assessed by comparing the experimental results with the FE model. An equation to predict the dent depth based on kinetic energy and stress is also presented. The results of this study provide a better understanding of the failure modes of hail and roof panels and their effects on dent resistance. In this study, the results of observations and numerical simulations agreed well with those of analytical models. The result is that the proposed equation overestimates the dent depths compared to the dent depths obtained with finite element models, while the equation leads to an underestimation of the dent depths found in the steel sheets.

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Section: Resultsmentioning

confidence: 88%

Section: Methods Of Creating Artificial Hailstonesmentioning

confidence: 94%

Figure 5 Time histories of impact force obtained by this study in comparison with the one performed by Carney et al 25 .…”

Section: Methods Of Creating Artificial Hailstonesmentioning

confidence: 99%

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Modelling the impact of hailstones on flat steel roofing membranes for residential buildings

2022

Sci Rep

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“…scans in the study of Wu [7] and with the dent depths obtained with the equation proposed by Uz et al [23]. For the remaining samples, the results of the models of FE are not even in the range of Figure 14b shows the resulting permanent deformation of the 0.55 mm thick steel sheet in the springback model linked to the successfully completed impact model in Abaqus.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the results of the experiments conducted by Wu [7], Eq. 23 is validated in the study by Uz et al [23]. In this study, some tests conducted by Wu [7] are performed in the model FE of this study.…”

Section: Resultsmentioning

confidence: 99%

An Analysis of Steel Roof Panels' Resistance to Out of Plane Hail Impacts

2022

Preprint

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Metal roof panels are often used on residential and commercial buildings. Steel panels subjected to hailstone impact are not sufficiently studied for their dent resistance. A finite element model (FEM) was used to analyze the entire experimental setup. For comparison with natural hailstones that remained intact after impact, artificial hailstones were launched onto different steel sheets based on their sizes and at different terminal velocities. The simulation approach and material properties are evaluated by comparing experimental results with the FE model. In addition, an equation for predicting dent depth using kinetic energy and stress is presented. The results of this study provide a better understanding of both hail and roof panel failure modes as well as their effect on dent resistance. In this study, the results of observations and numerical simulations were well matched with those of analytical models. As a result, the proposed equation overestimates dent depths compared with the ones determined by finite element models, whereas the ones found in the steel sheets are underestimated.

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Effects of Different Materials and Structures on Mechanical Properties of Hail Used in Aviation Testing

Liu,

Zhang,

et al. 2024

Aerospace

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Hail absorption test of aeroengine is one of the important components of airworthiness certification. The accurate test data are closely related to the density and mechanical properties of the artificial hail used in airworthiness tests. Through experimental research, this study explores the impact of distilled water, carbonated water and deionized water on the density and mechanical properties of artificial hail. The study addresses the significant differences between the density and mechanical properties of artificial hail and natural hail in existing studies. Based on this, a new method for preparing airworthiness test hail is proposed. The results indicate that artificial hail samples with distilled water as the hail core and carbonated water as the hail shell have densities ranging from 0.87 cm3 to 0.89 cm3. Furthermore, the estimated average maximum compressive strength of samples is 6.538 MPa, with some samples as low as 3.681 MPa. The mechanical properties of this artificial hail are more similar to those of natural hail. This method can more realistically simulate natural hail environments and can be used for the fine design of airworthiness certification criteria.

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Analysis of Out-of-Plane Hail Impact Resistance of Steel Roof Panels

Cited by 3 publications

References 17 publications

Modelling the impact of hailstones on flat steel roofing membranes for residential buildings

Modelling the impact of hailstones on flat steel roofing membranes for residential buildings

An Analysis of Steel Roof Panels' Resistance to Out of Plane Hail Impacts

Effects of Different Materials and Structures on Mechanical Properties of Hail Used in Aviation Testing

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