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Добірка наукової літератури з теми "Thin-walled engineering structure"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Thin-walled engineering structure"

1

Zhao, Xiao-Ling. "Thin-walled structure." Thin-Walled Structures 47, no. 10 (October 2009): 1019. http://dx.doi.org/10.1016/j.tws.2008.10.005.

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2

Zhou, Hui, Ping Xu, and Suchao Xie. "Composite energy-absorbing structures combining thin-walled metal and honeycomb structures." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 231, no. 4 (February 9, 2016): 394–405. http://dx.doi.org/10.1177/0954409716631579.

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The energy-absorbing structure of a crashworthy railway vehicle was designed by combining the characteristics of thin-walled metal structures and aluminum honeycomb structures: finite element models of collisions involving energy-absorbing structures were built in ANSYS/LS-DYNA. In these models, the thin-walled metal structure was modeled as a plastic kinematic hardening material, and the honeycomb structure was modeled as an equivalent solid model with orthotropic–anisotropic mechanical properties. The analysis showed that the safe velocity standard for rail vehicle collisions was improved from 25 km/h to 45 km/h by using a combined energy-absorbing structure; its energy absorption exceeded the sum of the energy absorbed by the thin-walled metal structure and honeycomb structure when loaded separately, because of the interaction effects of thin-walled metal structure and aluminum honeycomb structure. For an aluminum honeycomb to the same specification, the composite structure showed the highest SEA when using a thin-walled metal structure composed of bi-grooved tubes, followed by that using single-groove tubes: that with a straight-walled structure had the lowest SEA.

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3

Luo, Zhong, You Wang, Yunpeng Zhu, and Deyou Wang. "The Dynamic Similitude Design Method of Thin Walled Structures and Experimental Validation." Shock and Vibration 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/6836183.

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For the applicability of dynamic similitude models of thin walled structures, such as engine blades, turbine discs, and cylindrical shells, the dynamic similitude design of typical thin walled structures is investigated. The governing equation of typical thin walled structures is firstly unified, which guides to establishing dynamic scaling laws of typical thin walled structures. Based on the governing equation, geometrically complete scaling law of the typical thin walled structure is derived. In order to determine accurate distorted scaling laws of typical thin walled structures, three principles are proposed and theoretically proved by combining the sensitivity analysis and governing equation. Taking the thin walled annular plate as an example, geometrically complete and distorted scaling laws can be obtained based on the principles of determining dynamic scaling laws. Furthermore, the previous five orders’ accurate distorted scaling laws of thin walled annular plates are presented and numerically validated. Finally, the effectiveness of the similitude design method is validated by experimental annular plates.

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4

Shimoda, Masatoshi, and Yang Liu. "Free-Form Optimization of Thin-Walled Structure for Frequency Response Problem." Shock and Vibration 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/471646.

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We present a node-based free-form optimization method for designing forms of thin-walled structures in order to control vibration displacements or mode at a prescribed frequency. A squared displacement error norm is introduced at the prescribed surface as the objective functional to control the vibration displacements to target values in a frequency response problem. It is assumed that the thin-walled structure is varied in the normal direction to the surface and the thickness is constant. A nonparametric shape optimization problem is formulated, and the shape gradient function is theoretically derived using the material derivative method and the adjoint variable method. The shape gradient function obtained is applied to the surface of the thin-walled structure as a fictitious traction force to vary the form. With this free-form optimization method, an optimum thin-walled structure with a smooth free-form surface can be obtained without any shape parameterization. The calculated results show the effectiveness of the proposed method for the optimal free-form design of thin-walled structures with vibration mode control.

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5

Kneen, P. W. "Prestressed membrane structures — The ultimate thin-walled structure." Thin-Walled Structures 9, no. 1-4 (January 1990): 135–49. http://dx.doi.org/10.1016/0263-8231(90)90042-w.

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6

Ciubotariu, Vlad Andrei. "Crashing Behaviour Analysis of TWB Tubular Structures with Different Cross-Sections." Advanced Materials Research 814 (September 2013): 159–64. http://dx.doi.org/10.4028/www.scientific.net/amr.814.159.

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The present paper investigates the crashing behavior and energy absorption characteristics of thin-walled (tubular) structures with different cross-sections made from tailor welded blanks (TWB) which were subject of axial quasistatic loadings. Resulted data were obtained by using explicit nonlinear finite element code LS_Dyna V971. Implementing the TWB into the auto industry was an efficient method to decrease the general weight of different structures. By far, these kind of bimetallic structures are largely utilized in auto and naval industries because it led to important decrease of scarp quantities and general manufacturing costs, improved material use and probably the most important, great fuel efficiency. After reviewing the literature it was concluded that proper combination between mechanical characteristics of sheet metals, different thicknesses and cross-section shapes into the same thin-walled structure is far too little researched and understood. The aims of this study are better understandings of the crashing behavior regarding thin-walled structure with various cross-sections made from TWB blanks subject to quasistatic loadings. The non-linear finite element platform LS_Dyna V971 was used for the numerical analysis of the crushing behavior regarding the thin-walled structures. Having two materials constituting the thin-walled structures, the crashing behavior changed during the quasistatic loading. Thus, the crashing inertia of the structure is somehow limited and controlled. It is noted that material ratio should not be randomly chosen due to the unexpected crashing mode which could aggravate the prediction and control of the crashing behavior of the thin-walled structure.

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7

Kreja, Ireneusz, Tomasz Mikulski, and Czeslaw Szymczak. "ADJOINT APPROACH SENSITIVITY ANALYSIS OF THIN‐WALLED BEAMS AND FRAMES." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 11, no. 1 (March 31, 2005): 57–64. http://dx.doi.org/10.3846/13923730.2005.9636333.

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Sensitivity analysis of beams and frames assembled of thin‐walled members is presented within the adjoint approach. Static loads and structures composed of thin‐walled members with the bisymmetrical open cross‐section are considered. The analysed structure is represented by the one‐dimensional model consisting of thin‐walled beam elements based on the classical assumptions of the theory of thin‐walled beams of non‐deformable cross‐section together with superelements applied in place of location of structure nodes, restraints and stiffeners. The results of sensitivity analysis, obtained for the structure model described above, are compared with the results of the detailed FEM model, where the whole structure is discretised with the use of QUAD4 shell elements of the system MSC/NASTRAN.

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8

Yang, Li Feng, Yang Shi, and Wei Na Liu. "The Study of Thin-Walled Complex Parts Reverse Engineering Key Technologies." Advanced Materials Research 500 (April 2012): 511–16. http://dx.doi.org/10.4028/www.scientific.net/amr.500.511.

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The thin-walled complex parts reverse engineering is very different from conventional parts or the parts have some simple surface reverse engineering. There are some features. For example, it may have a lot of surface, structure complex, and it is difficulty that scanning point cloud data. Through this thesis, we put a stent by pedal as a thin-walled complex part, introduced some technology about it reverse engineering.

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9

Li, Zhichao, Subhash Rakheja, and Wen-Bin Shangguan. "Crushing behavior and crashworthiness optimization of multi-cell square tubes under multiple loading angles." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, no. 5 (August 21, 2019): 1497–511. http://dx.doi.org/10.1177/0954407019869127.

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Thin-walled structures are widely used as energy absorbers in automotive vehicles due to their lightweight and high-energy absorption efficiency. In order to improve the energy absorption characteristics of thin-walled structures subjected to different loading angles, different types of novel multi-cell structures are proposed in this paper. The numerical method is used to study the crushing behaviors of the proposed multi-cell structures under different loading angles. It is found that the proposed multi-cell structures have considerably small initial peak force under axial load and avoid the appearance of global buckling deformation mode under oblique loads. Moreover, reasonably distributed wall thickness for each square tube in the thin-walled structure can enhance its energy absorption capacity under different loading angles.

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10

Marur, P. R. "Analysis of thin-walled frames considering joint flexibilities." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 10 (October 1, 2007): 1221–29. http://dx.doi.org/10.1243/09544070jauto575.

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TAnalytical models are developed for static and dynamic analysis of thin-walled frames representing the automotive side structures. The model is based on one-dimensional beam theory that considers joint flexibility to compute stiffness and frequency response of the whole frame structure. The computed out-of-plane displacements under static and impact loading are in good agreement with those obtained from the shell finite element method. Using the validated analytical model, the influence of joint flexibility on the elastic response of the side structure is studied.

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Дисертації з теми "Thin-walled engineering structure"

1

Wang, Lyang Suan. "Automating Parametric Redesign of Structural Thin-Walled Frames Based On Topology Optimized Structure." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu156618342438725.

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2

Kolhatkar, Tanmay. "Nonlinear dynamic interactions between a rigid attachment bolted to a thin-walled sheet metal structure." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587124580918153.

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3

Sonje, Abhijit Ravindra. "Experimental and finite element investigation into the effects of manufacturing variability on the dynamic response of a bolted interface between a bracket and a thin-walled sheet metal structure." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546418059243072.

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4

Achour, Belkacem. "Nonlinear behaviour of thin walled bars." Thesis, Cardiff University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314695.

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5

Zheng, Li Ph D. Massachusetts Institute of Technology. "Fracture of welded aluminum thin-walled structures." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/35629.

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Анотація:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2006.
Includes bibliographical references (leaves 269-279).
A comprehensive methodology was developed in the thesis for damage prediction of welded aluminum thin-walled structures, which includes material modeling, calibration, numerical simulation and experimental verification. An extensive experimental program was conducted on large-scale welded panels used on Inter City Express (ICE) high-speed European passenger trains. These panels consist of geometrically complex extrusions, which are welded together to form the final structure. A wealth of data was generated to validate the proposed methodology. The current work has demonstrated the efficiency and robustness required for mainstream industrial applications. As the first step, a local fracture criterion was validated on two types of aluminum components without welds: (i) S-rails under quasi-static and dynamic axial loading; (ii) large-scale extruded aluminum panels under 4-point bending. With the fracture parameter calibrated from uniaxial tensile tests, numerical simulations gave excellent predictions of crack formation for test articles. A novel technique was developed to calibrate heterogeneous weldments for plasticity and fracture. This technique eliminates the need for machining and testing of miniature tensile specimens, cut from different zones within the weldment.
(cont.) The calibrated data was validated by comparing the numerical results with small and intermediate-scale tests. Excellent agreement was achieved. A wide range of aluminum weldments, including those developed as part of this study and relevant examples found in the literature, were examined from the point of view of microstructure, hardness distributions, stress-strain relations, etc. This study concludes that aluminum weldments exhibit very different mechanical characteristics than comparable steel weldments considering the above factors. The relative strength mismatch ratio between the weld zone and the Coarse Grain Heat Affected Zone (CGHAZ) MR, was identified as the most critical parameter for the global load/deformation response, and for fracture initiation of typical aluminum weld joints. Finally, a unique series of large-scale Mode I and III fracture tests was performed on full-scale welded ICE panels. The mechanism for crack initiation and growth under these two types of loadings was then investigated numerically and compared with the test results. Prediction of crack growth using the discrete element removal technique in combination with the proposed fracture locus, was shown to be accurate and robust.
(cont.) The most impressive result from the Mode I simulation was its ability to model a sudden jump of the crack from the weld zone to the HAZ, which was witnessed in the tests. Despite the differences in global loading from Mode I and Mode III cases, fracture in both loading modes was shown to be tension dominant. The new technique is now ready for industrial applications.
by Li Zheng.
Ph.D.

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6

Kwok, Raymond Moon Keung. "Mechanics of damaged thin-walled cylindrical shells." Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/993/.

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7

Al-Sheikh, Abdelraouf. "Behaviour of thin-walled structures under combined loads." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/7413.

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Анотація:

The thesis is concerned with the theory of thin-walled beams of open section. The aim is to formulate a general beam element for analysis of this type of structure. Thus a general stiffness matrix for the element, and a transformation matrix for loads and displacements with respect to centroid and shear centre were derived, by taking into consideration the value of-bimoment due to an axial force offset from the shear centre. Internal forces including bimoments, and global displacements including warping were calculated, and the stress distributions on the cross-sections of a beam at each-element node, were evaluated. The problem of buckling of thin-walled beams was treated using a finite strip program which was formulated to solve problems with the following combination of stresses: a) Linearly distributed axial stresses b) Uniform lateral stresses c) Uniform shear streses The results for beams of cruciform, box and channel sections, under uniform axial stresses and linearly distributed axial stresses, also accounting for flexural stresses, were conpared with other theoretical and some experimental results. The agreement was satisfactory. A series of, laboratory tests on beams of channel sections under compression were carried out. The recorded failure load and critical buckling load, computed by the Southwell plot method, were compared with the finite strip results and satisfactory agreement was observed.

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8

Zhang, Boshu. "Bistable and multi-stable thin-walled structures." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:05e0e48f-2da6-4d53-914a-cc1b46b9e87d.

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This study aims to comprehend the bistable and multi-stable behaviour of flexible straws with the intention of utilising it for future engineering applications. This behaviour is achieved by the multiple inversions of conical frustum shells within the corrugation of a flexible straw. This study examined the effects of various material models, geometry variables and loading methods on the inversion of close-top and open-top conical frustum shells via experiments and FEM simulations. This thesis consists of three main parts, and the second and the third parts are complementary to each other: First, we investigated the effects of applying a uniform vertical load to the upper rim of open-top frustum shells via FEM simulations. A reference model was simulated based on the measurements of an ordinary polypropylene flexible straw specimen, using two material models - linear elastic and elastically perfectly plastic. The effects of the interactions between frusta of the corrugated segment of a flexible straw were also studied by evaluating the difference in responses between an individual frustum and conjugated models of two or three frusta. It was found that by constraining the rotation of its bottom rim, an individual frustum can fairly reproduce the complex bistable behaviour of the shorter frustum within the corrugated part of a flexible straw. Furthermore, detailed parametric studies that focused on the effects of various geometric parameters were conducted and generalised formulas that predicted the critical force were derived. A comparison between the simulated results and the analytical model in predicting progressive inversion was made to distinguish the geometric boundaries that separate the one-off snap-through to the progressive inversion of frustum shells. Next, the behaviour of close-top frustum shells in response to vertical point loading at various locations on the top surface was evaluated. A hyperelastic material was used to fabricate the physical specimens. During the experiments, the corresponding deformed shapes were recorded by 3D scanning in addition to measurements of the displacement and reaction force. We observed a close resemblance between the experimental and FEM simulated results, which validated the FEM models. Two local peaks were observed before the structure was fully inverted into its secondary stable state and the overall critical force of the structure was defined by the higher one of the two. The relationship between their magnitudes and the loading locations was analysed and an optimal loading location which gave the minimum critical force was proposed and verified by additional simulations. Furthermore, generalised formulas in predicting critical force were also acquired based on parametric studies. The optimal loading location was found to be constant in spite of variations in height and thickness. The third part of this thesis discussed the effects of lateral point loading on both close-top and open-top frustum shells at various locations on the side surface and supplemented the second part. It is found that the removal of the top surface could cause the critical force to decrease if a point load was applied laterally. Moreover, we were able to fully invert the structure with a lower critical force through lateral loading in comparison to vertical loading.

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9

Howells, Hugh Alan. "Collapse behaviour of space trusses with thin-walled members." Thesis, University of Surrey, 1985. http://epubs.surrey.ac.uk/1038/.

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10

Hamid, A. B. A. "Bending of thin-walled beams of shallow open section." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303260.

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Книги з теми "Thin-walled engineering structure"

1

Wriggers, P., and Paulo de Mattos Pimenta. New trends in thin structures: Formulation, optimization and coupled problems. Wien: Springer, 2010.

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2

International Conference on Thin-Walled Structures (3rd 2001 Kraków, Poland). Thin-walled structures: Advances and developments : Third International Conference on Thin-Walled Structures. Amsterdam: Elsevier, 2001.

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3

International Conference on Thin-Walled Structures (2nd 1998 National University of Singapore). Thin-walled structures: Research and development : Second International Conference on Thin-Walled Structures. Amsterdam: Elsevier, 1998.

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4

Godoy, Luis A. Thin-walled structures with structural imperfections: Analysis and behavior. [Tarrytown, N.Y.]: Pergamon, 1996.

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5

Ojalvo, Morris S. Thin-walled bars with open profiles. Columbus, Ohio: Olive Press, 1990.

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6

Kujawa, Marcin. Statyka i analiza wrażliwości rusztów zbudowanych z prętów cienkościennych: Analiza teoretyczna i badania doświadczalne. Gdańsk: Wydawn. Politechniki Gdańskiej, 2000.

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7

F, Doyle James. Nonlinear Analysis of Thin-Walled Structures: Statics, Dynamics, and Stability. New York, NY: Springer New York, 2001.

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8

Kolpakov, A. G. Stressed Composite Structures: Homogenized Models for Thin-Walled Nonhomogeneous Structures with Initial Stresses. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004.

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9

Ignatʹev, V. A. Thin-walled cellular structures: Methods for their analysis. Rotterdam: Balkema, 1999.

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10

Lizin, V. T. Proektirovanie tonkostennykh konstrukt͡s︡iĭ. 2nd ed. Moskva: "Mashinostroenie", 1985.

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Частини книг з теми "Thin-walled engineering structure"

1

Valishvili, N. V., and A. K. Tvalchrelidze. "Numerical Analysis of Thin-Walled Structure Finite Displacements." In Lecture Notes in Engineering, 333–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82838-6_24.

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2

Kleinfeller, Nikolai, Christopher M. Gehb, Maximilian Schaeffner, Christian Adams, and Tobias Melz. "Assessment of Model Uncertainty in the Prediction of the Vibroacoustic Behavior of a Rectangular Plate by Means of Bayesian Inference." In Lecture Notes in Mechanical Engineering, 264–77. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_21.

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AbstractDesigning the vibroacoustic properties of thin-walled structures is of particularly high practical relevance in the design of vehicle structures. The vibroacoustic properties of thin-walled structures, e.g., vehicle bodies, are usually designed using finite element models. Additional development effort, e.g., experimental tests, arises if the quality of the model predictions are limited due to inherent model uncertainty. Model uncertainty of finite element models usually occurs in the modeling process due to simplifications of the geometry or boundary conditions. The latter highly affect the vibroacoustic properties of a thin-walled structure. The stiffness of the boundary condition is often assumed to be infinite or zero in the finite element model, which can lead to a discrepancy between the measured and the calculated vibroacoustic behavior. This paper compares two different boundary condition assumptions for the finite element (FE) model of a simply supported rectangular plate in their capability to predict the vibroacoustic behavior. The two different boundary conditions are of increasing complexity in assuming the stiffness. In a first step, a probabilistic model parameter calibration via Bayesian inference for the boundary conditions related parameters for the two FE models is performed. For this purpose, a test stand for simply supported rectangular plates is set up and the experimental data is obtained by measuring the vibrations of the test specimen by means of scanning laser Doppler vibrometry. In a second step, the model uncertainty of the two finite element models is identified. For this purpose, the prediction error of the vibroacoustic behavior is calculated. The prediction error describes the discrepancy between the experimental and the numerical data. Based on the distribution of the prediction error, which is determined from the results of the probabilistic model calibration, the model uncertainty is assessed and the model, which most adequately predicts the vibroacoustic behavior, is identified.

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3

Niu, Zhiguo, and Shaowei Hu. "Application of a Thin-Walled Structure Theory in Dynamic Stability of Steel Radial Gates." In Computational Structural Engineering, 153–58. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2822-8_17.

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4

Sridhar, K., V. Praveen Kumar, Gokul Haricharan, V. Dilip, V. Amin Himamshu, and R. Suthan. "Experimental Investigation of Thin-Walled Multi-Cell GFRP Structure on Energy Absorption." In Lecture Notes in Mechanical Engineering, 65–74. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1388-4_7.

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5

Dang, Bao-Loi, Hau Nguyen Ngoc, Hung Nguyen-Xuan, Hoang Duc Thao, and Magd Abdel Wahab. "Numerical Simulations of Precast Thin-Walled Concrete Blocks Forming Coastal Structure." In Proceedings of the 1st International Conference on Numerical Modelling in Engineering, 67–80. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2405-5_6.

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6

Lv, Hui, Libo Huang, Dae Lv, and Feng Yang. "Technical and economic analysis of new hollow girderless floor structure with thin-walled bellows." In Advances in Energy Science and Equipment Engineering II, 747–53. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315116167-144.

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7

Ahmad, Zaini, Muhammad Ruslan Abdullah, and Mohd Nasir Tamin. "Experimental and Numerical Studies of Fiber Metal Laminate (FML) Thin-Walled Tubes Under Impact Loading." In Mechanical and Materials Engineering of Modern Structure and Component Design, 433–43. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19443-1_35.

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8

Chuong, Nguyen Tien, and Doan Xuan Quy. "On the Thin-Walled Theory’s Application to Calculate the Semi-enclosed Core Structure of High-Rise Buildings." In Lecture Notes in Mechanical Engineering, 866–74. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3239-6_67.

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9

Powell, Peter C. "Stiffness of thin-walled structures." In Engineering with Fibre-Polymer Laminates, 346–69. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0723-5_8.

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Halfmann, A., E. Rank, M. Glück, M. Durst, F. Breuer, J. Bellmann, and C. Katz. "Computational Engineering for Wind-Exposed Thin-Walled Structures." In Lecture Notes in Computational Science and Engineering, 63–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-55919-8_7.

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Тези доповідей конференцій з теми "Thin-walled engineering structure"

1

Rogers, J. B. C., W. Zhuang, A. H. Shah, and N. Popplewell. "Guided Waves in Thin-Walled Structural Members." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0891.

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Abstract Infrastructures are deteriorating and billions of dollars are spent to rehabilitate them. Civil structures usually comprise of pavements and bridge decks (plates), pipelines (cylinders), and structural members having, say, I, L, etc. cross sections. The deterioration of these structures causes flaws arising from factors such as the severity of the weather, aging, corrosion, fatigue cracks, etc... The flaws degrade the stiffness (material properties) of a structure and severe conditions eventually can result in a catastrophic failure. Thus, the detection and characterization of the flaws is important in evaluating and monitoring the integrity of existing structures and determining the viability of their continued use or a change in use. Therefore, it is necessary to employ a reliable and effective, quantitative nondestructive evaluation (QNDE) to characterize the mechanical properties and identify defects in the structures. Ultrasonic waves provide such a technique but a knowledge of guided elastic waves is required. Considerable information is available for waves in plates and cylinders but very little work has been reported in the literature on the waves in thin-walled, structural members. In this paper, a semi-analytical finite element (SAFE) formulation is proposed to study the wave propagation characteristics of thin-walled members. Common structural members are considered as an assemblage of thin plates. The members are assumed to be infinitely long in the longitudinal (axial) direction. The ratio of the thickness of the plate to the wavelength in the axial direction is assumed to be small so that the plane-stress assumption is valid. Employing a finite element modeling in the transverse direction circumvents difficulties associated with the cross-sectional profile of the member. The dynamic behavior is approximated by dividing the plates into several line (one-dimensional) segments and representing the generalized displacement distribution through the segment by polynomial interpolation functions. By applying Hamilton’s principle, the dispersion equationis obtained as a standard algebraic eigenvalue problem. The accuracy of the proposed method is demonstrated by comparing the results with analytical solutions. Detailed numerical results are presented for an I shaped cross section.

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Jenkins, David M., Anthony F. Luscher, and Gaurav Suri. "Fastening Strategies for Large Thin-Walled Enclosures." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dac-8624.

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Abstract Current attachment strategies for thin walled thermoformed panels use various concepts from screws, rivets, to snap-fits, etc. The most common of these strategies is to use standard metal fasteners such as pop rivets or screws. According to Boothroyd & Dewhurst analysis, separate fasteners do not add functionality to the product and therefore the overall assembly efficiency of the structure is low (Boothroyd and Dewhurst, 1989). Each fastener also adds several manufacturing and assembly steps. For each standard fastener a through hole must be drilled in the panels and the fastener must be inserted. There is also the possibility that the fasteners will not hold the panels tightly against each other resulting in joints with a poor physical appearance and a loss of structural stiffness. This paper explores different innovative strategies to fasten thin walled thermoformed panels. The rod, ribbon and interlocking concepts use nesting strategies to aid attachment with the addition of a single separate part or allowing the walls themselves to form a joint. Nesting strategies are used to minimize the number of fasteners needed in a joint (Luscher et. al. 1996). A nesting strategy uses locating features to carry load in certain directions which reduces the load on the fasteners. Any reduction in load will lead to a reduction in the number of fasteners needed. The other concept discussed, separate plastic fastener concept, will change attachment from metal fasteners to independent plastic snap-fits. This is a simplified alteration resulting in minor changes to manufacturing and assembly processes. Equations for attachment strategies with the use of certain concepts will be addressed. Also data from testing on snap-fits in use with a thin walled thermoformed structure will be reported.

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Jenson, Sean, and Muhammad Ali. "Dynamic Response of Cross Tube With Crushable Foam-Filled Cellular Core." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-70076.

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Abstract Thin-walled crush tubes and other axial members are often employed as energy absorbers in vehicle chassis to improve crashworthiness of front and side chassis members. Thin-walled axial crushing members are primarily used due to their high strength to weight ratios. Previous works cover extensively the study of thin-walled members under axial crushing loads. Additionally, work has been done exploring the effects of core addition to a standalone thin-walled structure. Functionally graded cellular structures are often employed to enhance energy absorption due to their high strength and stability with minimal added weight burden. Previously, investigation on the addition of composite functionally graded hexagonal extruded cores proved to increase energy absorption capacity and improve stability of the structure. The present study is a continuation of the previous work on functionally graded core material addition to thin-walled crush tubes. Additionally, this study investigated the addition of crushable foam material to the volume of the cellular structures. This study was conducted utilizing ABAQUS explicit dynamic modeling environment. The addition of graded cellular core material with crushable foam provided increased energy absorption capacity of the structure through increased structural stiffness and decreased crush stroke. The structure exhibited progressive folding/collapse mechanisms with a more global crushing response as compared to an empty tube structure. As compared to previous graded cellular core structures, the crushable foam addition promoted a more global structural response and allowed for total energy absorption before structure densification. The addition of core materials within thin-walled crush tubes have shown positive influences on energy absorbing capacity and overall performance of crush tube members.

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Rozylo, Patryk, and Hubert Debski. "Progressive failure analysis of thin-walled composite structure with open cross-section." In COMPUTATIONAL TECHNOLOGIES IN ENGINEERING (TKI’2018): Proceedings of the 15th Conference on Computational Technologies in Engineering. Author(s), 2019. http://dx.doi.org/10.1063/1.5092010.

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Luketa-Hanlin, Anay, and Stephen Attaway. "Massively Parallel Computations of Damage to a Thin-Walled Structure From Blast." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41423.

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The objective of this work is to determine initial structural response from a blast threat for the newer class of liquefied natural gas (LNG) vessels. Import of LNG by ship is expected to significantly increase in the coming decade and there is concern over vulnerability. Current vessels hold up to 160,000 m3 of LNG, while the new vessels will hold up to 266,000 m3. These vessels are double-hulled and have an insulating containment system which keeps the LNG at a temperature of 111 K. Calculations were performed to determine the structural response of these ships from blast using CTH, a shock-physics code, developed at Sandia National Laboratories. The calculations were performed on massively parallel computing platforms (∼1000 processors) due to the number of elements required (∼109). Detailed geometry of the stiffeners, framing, and changing hull thickness with elevation were included, as well as the insulation, LNG, and water. Thus, there is multiphase interaction with the structure. The geometry of these ships fall within a class of problems termed ‘thin-walled problems’ since they require resolution of length scales from ∼10 mm to ∼10 m. In order to capture the smallest length scales an adaptive mesh refinement (AMR) feature was used. This feature allows for cells to be concentrated in active regions as the calculation progresses. This paper will discuss the resolution challenges of simulating thin-walled problems, as well as regimes in which shock-physics codes, such as CTH, are appropriate for application. Results will be provided without disclosure of threats.

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Elmarakbi, Ahmed, and Niki Fielding. "Deformation and Energy Absorption Characteristics of Thin-Walled Structures." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12783.

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In this paper, to investigate the design of an energy absorbing street pole, a study of axial crush behaviour of metal thin longitudinal tubes (columns) are investigated along with a number of variables such as cross-sectional shape, shell thickness, as well as the velocity affects on columns. Tests have been carried out on the effects of bedded crumple initiators placed a various heights from the top of the column, in determining the desired value of peak load reduction, along with the effect in energy absorption of the column. With the conclusion of the desired variables for the design of an energy absorbing column, the columns are placed 90 degrees to that of the base of the model street column. Simulation of frontal impact of a vehicle and street column are analysed and compared to that of the energy absorbing street column concept. Studies are carried out by numerical simulation via the explicit finite element code LS-DYAN. Results compare the absorbed energy and the deflection of each variable, and recommend best design for the column structure which improved vehicle crashworthiness.

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Li, Mingzhe, Bang He, Saeed Barbat, Sihao Gu, and Weiyi Lu. "Rate Dependent Reinforcement of Liquid Nanofoam on Thin-Walled Tubes." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71455.

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Thin-walled metal tubes have been widely used as energy absorbers to mitigate adverse effects of impact and protect structures and facilities. However, once the initial buckling stress of the tube is reached, the post-buckling plateau of the tube has a much reduced average stress which determines the energy absorption efficiency of the empty tube. As a result, the real energy absorption efficiency of the thin-walled tube is much lower than the theoretical limit which is proportional to the value of initial buckling stress. We hypothesize that by filling thin-walled tubes with the novel liquid nanofoam (LN), (i) the energy absorption efficiency of the hybrid structure can reach the theoretical limit, and (ii) the main working mechanism is the effect of solid-liquid interaction on tube buckling. To test these hypotheses, we have characterized the energy absorption efficiency of LN filled steel tubes by using quasi-static compression tests and dynamic impacts. The quasi-static behavior of LN filled tubes is characterized by an Instron 5982 universal tester. Results show that the gravimetric and volumetric energy absorption efficiencies of LN filled steel tubes are 20% and 220% higher than the values of empty tubes, respectively. This is due to the changed buckling mode and the promoted post-buckling stress of the hybrid structure by the highly compressible LN. The dynamic behavior of LN filled tubes is characterized by a dynamic impact test (∼3 m/s) with a lab-customized drop tower apparatus. It is found that both the gravimetric and volumetric energy absorption efficiencies of LN filled tubes are further increased by 16%. The strain rate dependent behavior of LN filled tubes must be attributed to the solid-liquid interaction between the LN and the steel tube wall, which is further verified by comparing the mechanical behaviors of LN filled tubes with solid foams filled tubes. Our experimental results have demonstrated that the energy absorption efficiency of thin-walled tubes are significantly improved by the LN filler especially at higher strain rates. This hybrid structure may have a potential for future use in the design of light-weight and small scale cellular structures for vehicle safety and crashworthiness.

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Khozeimeh, M. A., R. Moazed, and R. Fotouhi. "Optimum Selection of Thin-Walled Laminated Composite Structures in Robot Design." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73914.

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Abstract In this paper, a simplified approach for the design of thin-walled laminated composite beam structures is presented. For this purpose, structural efficiency metrics have been developed that allow for the integrated selection of layup sequence, materials of construction, and cross-sectional shape of laminated composite beams. The structural efficiency metrics are plotted in design charts for axial, bending (in both cross-section’s principal directions), and torsional loading conditions. The design charts provide the designer with an accurate and efficient approach for the selection of the optimum fiber direction, number of layers in the laminate, and mass of the overall structure. The results are generated for two different sizes of envelopes to analyze various cross-sectional types and sizes. It is shown that the design charts can be applied to single open and closed loop cross sections as well as multi-cell sections. The proposed simplified approach and developed design charts have been used for increasing the bending and torsional stiffness of a laminated composite robotic arm. The results show that the design charts can be used to accurately predict stiffnesses and deformations and assist the designer in selecting the various parameters that govern the performance of laminated composite beams.

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Ge, Y. F., J. M. Hou, X. L. Jia, and C. Liu. "Cutting Temperature investigation when Heavy Milling Welded Aluminum-Thin- Walled Hollow Structure." In 3rd International Conference on Material, Mechanical and Manufacturing Engineering (IC3ME 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/ic3me-15.2015.343.

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Park, S. U., B. J. Gilmore, and R. R. Singer. "Dynamic Simulation for the Structural Integrity of Fluid Filled Thin Walled Tanks Subjected to Impact Loading." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/dac-1123.

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Abstract The transport of hazardous materials in truck cargo tanks can cause severe environmental damage as a result of the tank’s failure during a collision. Impact due to collision involves the transient dynamic response of the tank, fluid and their interaction. This paper develops a computational approach to predict the dynamic transient response of the tank shell structure subjected to impact loads during crash accidents. In order to compute the fluid and structure interaction, the finite element formulations for the added mass to the structure are developed and integrated with DYNA3D, the nonlinear dynamic structural finite element code. Thus, the computer based approach provides an efficient design tool for fluid filled thin walled structures in general and cargo tanks subjected to an impact situation. This paper presents the lumping process required by the added mass approach for cargo tanks under impact conditions. The structural integrity performance of cargo tank shell construction is investigated.

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