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Flexural rigidity
About: Flexural rigidity is a research topic. Over the lifetime, 3829 publications have been published within this topic receiving 56780 citations.
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64 citations
TL;DR: In this article, a simple method was proposed to simulate the progressive collapse behavior of a ship's hull girder subjected to longitudinal bending, and the analysis was performed on an existing bulk carrier, where the authors found that the full plastic bending moment can not be attained due to buckling of the deck plates under sagging condition and that of the bottom and inner bottom plates under hogging condition.
Abstract: It is very important to estimate the load carrying capacity of a ship's hull as a whole from the viewpoints of safety and economy. For this purpose, a simple method was proposed to simulate the progressive collapse behaviour of a ship's hull girder subjected to longitudinal bending. In this method, the cross section of a hull girder is divided into small elements composed of a stiffener and attatched plating. For each stiffener element, the average stress-strain relationship under axial load is derived based on the equilibrium conditions of forces and moments. The buckling and yielding in both stiffener and plate are taken into account. Then, a step-by-step increase of vertical curvature is applied to the hull girder assuming that the plane cross section remains plane. At each incremental step, the tangential flexural rigidity of the cross section is evaluated using the tangential slope of the average stress-strain curves of the elements as well as the incremental bending moment due to the curvature increment.Performing sample calculations on existing girder models tested under pure bending, the rationality of the proposed method was examined. Then, the analysis was performed on an existing bulk carrier, and the progressive collapse behaviour of the cross section under bending load was discussed. It was found that the full plastic bending moment can not be attained due to buckling of the deck plates under sagging condition and that of the bottom and inner bottom plates under hogging condition. It was also found that the maximum bending moment carried by the cross section under sagging condition is 20% lower than that under hogging condition.
64 citations
TL;DR: In this paper, the authors characterize the mechanical properties of hollow sphere (HS) steel foam, and apply calibrated Deshpande-Fleck plasticity to mechanical simulations of steel foam components.
64 citations
TL;DR: Hollow glass fibre reinforced plastics have a structural performance niche in a class of their own as discussed by the authors, they offer increased flexural rigidity compared to solid glass fiber reinforced plastics, they of...
Abstract: Hollow glass fibre reinforced plastics have a structural performance niche in a class of their own. They offer increased flexural rigidity compared to solid glass fibre reinforced plastics, they of...
64 citations
TL;DR: Results indicate that stalk flexural stiffness is a good predictor of stalk strength and that it may outperform rind penetration resistance as a selective breeding tool to improve lodging resistance of future varieties of maize.
Abstract: Late-season stalk lodging in maize (Zea mays L.) is a major agronomic problem that has farreaching economic ramifications. More rapid advances in lodging resistance could be achieved through development of selective breeding tools that are not confounded by environmental factors. It was hypothesized that measurements of stalk flexural stiffness (a mechanical measurement inspired by engineering beam theory) would be a stronger predictor of stalk strength than current technologies. Stalk flexural stiffness, rind penetration resistance and stalk bending strength measurements were acquired for five commercial varieties of dent corn grown at five planting densities and two locations. Correlation analyses revealed that stalk flexural stiffness predicted 81% of the variation in stalk strength, whereas rind penetration resistance only accounted for 18% of the variation in stalk strength. Strength predictions based on measurements of stalk flexural stiffness were not confounded by hybrid type, planting density, or planting location. Strength predictions based on rind penetration resistance were moderately to severely confounded by such factors. Results indicate that stalk flexural stiffness is a good predictor of stalk strength and that it may outperform rind penetration resistance as a selective breeding tool to improve lodging resistance of future varieties of maize. D.J. Robertson, S.Y. Lee, M. Julias, and D.D. Cook, Division of Engineering, New York Univ. Abu Dhabi, Abu Dhabi, United Arab Emirates. Received 1 Nov. 2015. Accepted 20 Jan. 2016. *Corresponding author (douglascook@nyu.edu). Published in Crop Sci. 56:1711–1718 (2016). doi: 10.2135/cropsci2015.11.0665 © Crop Science Society of America | 5585 Guilford Rd., Madison, WI 53711 USA This is an open access article distributed under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Published May 27, 2016
64 citations