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Effect of Implanted Delamination and Core Density on the Buckling Behavior of Sandwich Composites 植入分层和芯密度对夹层复合材料屈曲行为的影响
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2032
H. Mahfuz, S. Islam, L. Carlsson, Makeba Atkins, S. Jeelani
{"title":"Effect of Implanted Delamination and Core Density on the Buckling Behavior of Sandwich Composites","authors":"H. Mahfuz, S. Islam, L. Carlsson, Makeba Atkins, S. Jeelani","doi":"10.1115/imece2000-2032","DOIUrl":"https://doi.org/10.1115/imece2000-2032","url":null,"abstract":"\u0000 Foam core sandwich composites have been fabricated using innovative co-injection resin infusion technique and tested under in-plane compression. The sandwich construction consisted of Klegcell foam as core materials and S2-Glass/Vinyl ester composites as face sheets. Tests were conducted with various foam densities and also with implanted delamination between the core and the face sheet. The intent was to investigate the effect of core density, and the effect of core-skin debonds on the overall buckling behavior of the sandwich. Analytical and finite element calculations were also performed to augment the experimental observations. It has been observed that core density has direct influence on the global buckling of the sandwich panel, while embedded delamination seem to have minimal effect on both global as well as local buckling. Detailed description of the experimental work, finite element modeling and analytical calculations are presented in this paper.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125742597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stability of Sandwich Cylindrical Shells and Panels With Rib-Reinforced Facings 夹层圆柱壳和肋加固面板的稳定性
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2028
V. Birman, G. Simitses, L. Shen
{"title":"Stability of Sandwich Cylindrical Shells and Panels With Rib-Reinforced Facings","authors":"V. Birman, G. Simitses, L. Shen","doi":"10.1115/imece2000-2028","DOIUrl":"https://doi.org/10.1115/imece2000-2028","url":null,"abstract":"\u0000 A new concept in sandwich structures, considered in the paper, employs composite facings with internal ribs. The advantage of this approach is related to enhanced local stiffness and strength of the facings. In particular, the material of facings can be redistributed making the facings thinner, while using the released material for internal ribs. Obviously, this means that the weight of the structure remains without change, while local strength and stiffness increase. The penalty for using this approach is a potential decrease of global stability and global strength as well as lower natural frequencies. The present paper addresses the stability problem for cylindrical shells and panels subjected to axial compression. Buckling loads are calculated for short, complete, cylindrical shells. Based on the numerical results discussed below, it is obvious that ribs should be symmetrically located with respect to the middle surface of the shell. Then a decrease of global stability is relatively small and the proposed design is justified and feasible in practical applications.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126164090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Failure of Foam Core Sandwiches: Numerical Simulation by Microplane Model 泡沫芯夹层破坏:微平面模型数值模拟
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2024
Z. Bažant, M. Brocca
{"title":"Failure of Foam Core Sandwiches: Numerical Simulation by Microplane Model","authors":"Z. Bažant, M. Brocca","doi":"10.1115/imece2000-2024","DOIUrl":"https://doi.org/10.1115/imece2000-2024","url":null,"abstract":"\u0000 The paper presents a new constitutive model for closed-cell polymeric foams. The model is of the microplane type. In this model, the constitutive law is characterized in terms of vectors rather then tensors. The conceptual simplicity of this ‘first-principles’ approach makes it possible to base the model more directly on the physical phenomena occurring in the microstructure, in this case the elastic bending of the cells idealized as spheres in contact. The model is then employed in a finite element analysis of three point bending tests of sandwich beams failing by core indentation. Good agreement of the numerical results with the experimental observations is achieved. The softening and size effect engendered by the reduction of tangential bending stiffness due to the geometrically nonlinear effect of core indentation is discussed.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130959706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Analysis and Optimization of Foam Core Mid-Plane Asymmetric Sandwich Beams Under Lateral Loads 横向荷载作用下泡沫芯中部非对称夹层梁的分析与优化
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2035
J. Vinson, Nihar R. Satapathy
{"title":"Analysis and Optimization of Foam Core Mid-Plane Asymmetric Sandwich Beams Under Lateral Loads","authors":"J. Vinson, Nihar R. Satapathy","doi":"10.1115/imece2000-2035","DOIUrl":"https://doi.org/10.1115/imece2000-2035","url":null,"abstract":"\u0000 The equations with which to analyze, design and optimize honeycomb sandwich beams subjected to laterally distributed loads are presented. They apply to beams using composite materials and for isotropic materials. Specifically they account for mid-plane asymmetry in order to maximize the structural efficiency, thus providing for differing face materials, ply sequencing and/or thicknesses. Explicit solutions are given for the beam subjected to a uniform lateral load for several boundary conditions. To attain minimum weight, the means to select each face thickness, the core depth and the honeycomb core wall thickness and cell size are given. Localized face dimpling and face wrinkling, using and comparing the results of Heath equation and the Hoff-Mautner equation are included. The effects of transverse shear deformation are also shown. In order to choose the face material and core materials to achieve a minimum weight structure, Factors of Merit are defined for the faces and the core. Various face materials are then compared.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123942730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design Curves for 3D Reinforced Composite Laminated Double Cantilever Beams 三维增强复合材料层合双悬臂梁的设计曲线
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2027
G. Mabson, L. Deobald
{"title":"Design Curves for 3D Reinforced Composite Laminated Double Cantilever Beams","authors":"G. Mabson, L. Deobald","doi":"10.1115/imece2000-2027","DOIUrl":"https://doi.org/10.1115/imece2000-2027","url":null,"abstract":"Design curves for 3D reinforced composite laminated double cantilever beams (DCB) are developed and presented. Z-pin and stitch reinforcements are considered. These curves may be used by designers and analysts in specifying Z-pin and stitch fields for preliminary design to arrest the progression of delaminations in laminated composite structures.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121924493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Elasticity Solutions for a Sandwich Orthotropic Cylindrical Shell Under External/Internal Pressure, and Axial Load 夹心正交各向异性圆柱壳内外压和轴向载荷作用下的弹性解
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2036
G. Kardomateas
{"title":"Elasticity Solutions for a Sandwich Orthotropic Cylindrical Shell Under External/Internal Pressure, and Axial Load","authors":"G. Kardomateas","doi":"10.1115/imece2000-2036","DOIUrl":"https://doi.org/10.1115/imece2000-2036","url":null,"abstract":"\u0000 The elasticity solution is constructed for a cylindrical sandwich shell under external and/or internal pressure and for the same shell under axial load. The solution is an extension of the one for a homogeneous, monolithic shell and is provided in closed form. All three phases, i.e., the two face-sheets and the core are assumed to be orthotropic. Moreover, there are no restrictions as far as the individual thicknesses of the face-sheets and the sandwich construction may even be asymmetric. These solutions can be used as benchmarks for assessing the performance of various sandwich shell theories. Illustrative results are provided in comparison to the sandwich shell theory.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122864783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sandwich Shell Finite Element for Dynamic Explicit Analysis 夹层壳有限元动力显式分析
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2040
A. Tabiei, R. Tanov, V. Birman
{"title":"Sandwich Shell Finite Element for Dynamic Explicit Analysis","authors":"A. Tabiei, R. Tanov, V. Birman","doi":"10.1115/imece2000-2040","DOIUrl":"https://doi.org/10.1115/imece2000-2040","url":null,"abstract":"\u0000 This work presents the finite element (FE) formulation and implementation of a higher order shear deformable shell element for dynamic explicit analysis of composite and sandwich shells. The formulation is developed using a displacement based third order shear deformation shell theory. Using the differential equilibrium equations and the interlayer requirements, a treatment is developed for the transverse shear, resulting in a continuous, piecewise quartic distribution of the transverse shear stresses through the shell thickness. The FE implementation is cast into a 4-noded quadrilateral shell element with 9 degrees of freedom (DOF) per node. Only C0 continuity of the displacement functions is required in the shell plane, which makes the present formulation applicable to the most common 4-noded bilinear isoparametric shell elements. Expressions are developed for the critical time step of the explicit time integration for orthotropic homogeneous and layered shells based on the developed third order formulation. To assess the performance of the present shell element it is implemented in the general nonlinear explicit dynamic FE code DYNA3D. Several problems are solved and results are compared to other theoretical and numerical results. The developed sandwich shell element is much more computationally efficient for modeling sandwich shells than solid elements.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128162109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Static and Dynamic Buckling of Sandwich Columns 夹芯柱的静、动力屈曲
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2023
G. Simitses, L. Shen
{"title":"Static and Dynamic Buckling of Sandwich Columns","authors":"G. Simitses, L. Shen","doi":"10.1115/imece2000-2023","DOIUrl":"https://doi.org/10.1115/imece2000-2023","url":null,"abstract":"\u0000 The paper deals with the theoretical prediction of buckling loads for sandwich columns with metallic and laminated facings and foam core. The loading is a uniform axial compression, applied statically (very slowly) and suddenly with constant magnitude and infinite duration (step loading). The effect of length and boundary conditions is assessed and results are presented for the following cases for a cantilever column, a simply supported column and a clamped column for lengths of 80 inches and 240 inches. Several fiber materials are used in the laminated facings. The static critical loads are computed from three different sources and the dynamic critical loads are obtained by employing the computer code DYNA3D. For the dynamic case, the Budiansky-Roth criterion is applied.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122141612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Adhesive Joints for Composite Sandwich Structures 复合材料夹层结构的粘接接头
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2034
G. Dvorak, Jian Zhang, O. Canyurt
{"title":"Adhesive Joints for Composite Sandwich Structures","authors":"G. Dvorak, Jian Zhang, O. Canyurt","doi":"10.1115/imece2000-2034","DOIUrl":"https://doi.org/10.1115/imece2000-2034","url":null,"abstract":"\u0000 A new approach is explored for joining of thick, woven E-glass/vinyl ester composite laminated plates to steel or composite plates, with applications in naval ship structures. Adhesive is applied along through-the-thickness contoured interfaces, employing tongue-and-groove geometry. Both experimental and finite element modeling results are presented. They show that adhesively bonded tongue-and-groove joints between steel and composite plates loaded in monotonically increasing longitudinal tension, are stronger than conventional strap joints even in relatively thin plates. In particular, a single 0.25 in. wide and 8 or 12 in. long steel tongue, bonded by the Dexter- Hysol 9339 adhesive to a groove in a 0.5 in. thick laminated plate, can support a 20,000 lbs tension force. This force is expected to increase in proportion to plate thickness. Simple design rules indicate that high joint efficiency can be achieved for any thickness of the joined plates.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132267767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Implication of Anisotropy of Face-Sheets and Core Layer Materials on the Load Carrying Capacity of Advanced Sandwich Panels: Linear and Nonlinear Responses 面片和芯层材料各向异性对先进夹层板承载能力的影响:线性和非线性响应
Mechanics of Sandwich Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-2039
L. Librescu
{"title":"Implication of Anisotropy of Face-Sheets and Core Layer Materials on the Load Carrying Capacity of Advanced Sandwich Panels: Linear and Nonlinear Responses","authors":"L. Librescu","doi":"10.1115/imece2000-2039","DOIUrl":"https://doi.org/10.1115/imece2000-2039","url":null,"abstract":"\u0000 This paper deals with a comprehensive geometrically nonlinear theory of shallow sandwich shells that includes also the effect of the initial geometric imperfections. It is assumed that the face-sheets of the sandwich structure are built-up from anisotropic materials layers, whereas the core layer from an orthotropic material. As a result of its features the structural model can provide important information related to the load carrying capacity of sandwich structures in the pre- and postbuckling ranges. Moreover, by using the directionality properties of face-sheets materials, possibilities of enhancing the load carrying capacity of sandwich shells/plates are reached. Selected numerical illustrations emphasizing these features are presented and pertinent conclusions on the beneficial implications of anisotropy of face-sheets and core layer materials upon the load-carrying capacity of sandwich panels are emphasized.\u0000 Under the present study, the sandwich structure consists of a thick core-layer bonded by the face-sheets that consist of composite anisotropic materials, symmetrically laminated with respect to the mid-surface of the core-layer. The initial geometric imperfection consisting of a stress free initial transversal deflection, will be also incorporated in the study. The loads under which the nonlinear response will be analyzed consist basically of uniaxial/biaxial compressive edge and lateral loads.","PeriodicalId":104214,"journal":{"name":"Mechanics of Sandwich Structures","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122707986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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