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Contemporary Research in Engineering Mechanics最新文献

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Exact Solutions for the Free Vibrations and Buckling of Rectangular Plates With Linearly Varying In-Plane Loading 平面内载荷线性变化的矩形板的自由振动和屈曲的精确解
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23753
K. Chang, Hyunju Shim, Jae-Hoon Kang
{"title":"Exact Solutions for the Free Vibrations and Buckling of Rectangular Plates With Linearly Varying In-Plane Loading","authors":"K. Chang, Hyunju Shim, Jae-Hoon Kang","doi":"10.1115/imece2001/ad-23753","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23753","url":null,"abstract":"\u0000 An exact solution procedure is formulated for the free vibration and buckling analysis of rectangular plates having two opposite edges simply supported when these edges are subjected to linearly varying normal stresses. The other two edges may be clamped, simply supported or free, or they may be elastically supported. The transverse displacement (w) is assumed as sinusoidal in the direction of loading (x), and a power series is assumed in the lateral (y) direction (i.e., the method of Frobenius). Applying the boundary conditions yields the eigenvalue problem of finding the roots of a fourth order characteristic determinant. Care must be exercised to obtain adequate convergence for accurate vibration frequencies and buckling loads, as is demonstrated by two convergence tables. Some interesting and useful results for vibration frequencies and buckling loads, and their mode shapes, are presented for a variety of edge conditions and in-plane loadings, especially pure in-plane moments.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127351549","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
Damage Initiation and Evolution in Woven Composites 编织复合材料损伤的发生与演化
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23780
X. Tang, J. Whitcomb
{"title":"Damage Initiation and Evolution in Woven Composites","authors":"X. Tang, J. Whitcomb","doi":"10.1115/imece2001/ad-23780","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23780","url":null,"abstract":"\u0000 The damage initiation and evolution mechanisms in plain and satin weave composites were studied using three-dimensional finite element analysis. The tow paths of the weave were selected such that the wavy region of the tows were identical in both weaves. The damage initiation and evolution behaviors in these comparable wavy regions were compared and discussed in terms of stress components that initiate damage, the overall stress/strain relationship and the accumulation of the damaged volume in the warp tow, fill tow and matrix pockets. The results showed significant similarities in many aspects of the damage behaviors such as damage modes, stiffness loss and damage accumulation processes.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130405505","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
Nonlinear Through-Thickness Behavior of a Toroidal Shell Using 2-D Finite Elements 用二维有限元研究环面壳的非线性贯厚行为
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23777
J. Greer, A. Palazotto
{"title":"Nonlinear Through-Thickness Behavior of a Toroidal Shell Using 2-D Finite Elements","authors":"J. Greer, A. Palazotto","doi":"10.1115/imece2001/ad-23777","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23777","url":null,"abstract":"\u0000 The use of two-dimensional shell finite elements is explored for finding the three-dimensional state of stress in a toroidal shell. The torus under study represents a 90-degree pipe elbow with a pressure load on a portion of its surface. Layer-wise polynomials are used to represent the transverse shear and normal stretch deformations in the shell. These functions are chosen such that displacements and stresses (but not strains) are continuous at the ply interfaces. Both isotropic and composite (cross-ply) versions of the shell are investigated, and the thicknesses of each are varied to see the effect on through-thickness behavior. Significant qualitative and quantitative differences in these behaviors are observed, particularly in the important direct through-thickness (peeling) stress. The contribution of the transverse deformations to strain energy is investigated and, in most of the shells studied, the thickness stretch component is found to be a greater contributor to strain energy than the transverse shear, though the transverse shear contribution is seen to vary more dramatically with changes in shell thickness.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122433062","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
Integrally-Stiffened Composite Damage Tolerance Evaluated by Computational Simulation 基于计算仿真的整体加筋复合材料损伤容限评估
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23760
C. Chamis, L. Minnetyan
{"title":"Integrally-Stiffened Composite Damage Tolerance Evaluated by Computational Simulation","authors":"C. Chamis, L. Minnetyan","doi":"10.1115/imece2001/ad-23760","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23760","url":null,"abstract":"\u0000 An integrally stiffened graphite/epoxy composite rotorcraft structure is evaluated via computational simulation. A computer code that scales up constituent micromechanics level material properties to the structure level and accounts for all possible failure modes is used for the simulation of composite degradation under loading. Damage initiation, growth, accumulation, and propagation to fracture are included in the simulation. Design implications with regard to defect and damage tolerance of integrally stiffened composite structures are examined. A procedure is outlined regarding the use of this type of information for setting quality acceptance criteria, design allowables, damage tolerance, and retirement-for-cause criteria.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124096895","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
Dynamics of Composite Structures With Multiple Delaminations 多重分层复合材料结构动力学
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23778
W. Lestari, H. Lou, S. Hanagud
{"title":"Dynamics of Composite Structures With Multiple Delaminations","authors":"W. Lestari, H. Lou, S. Hanagud","doi":"10.1115/imece2001/ad-23778","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23778","url":null,"abstract":"\u0000 The objective of this paper is to explore if changes in the structural dynamic response and structural dynamic characteristics can be used to identify the existence, location and magnitude of defects like a delamination or an impact damage, at the macroscale level, before they can grow to their critical sizes. Specifically dynamic response of composite structures, with delamination defects, is discussed in this paper. The experimental analysis is performed to capture the effects of nonlinearities on the dynamic response of a beam with multiple delaminations. To describe the opening and closing mode of the delaminated segments of the beam during the vibration, an analysis is performed by using a model with piecewise spring. Then, the nonlinear dynamic response is calculated.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"411 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115993924","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
Asymptotic Construction of Reissner-Like Models for Composite Plates With Accurate Strain Recovery 具有精确应变恢复的复合材料板类reissner模型的渐近构造
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23766
Wenbin Yu, D. Hodges, V. Volovoi
{"title":"Asymptotic Construction of Reissner-Like Models for Composite Plates With Accurate Strain Recovery","authors":"Wenbin Yu, D. Hodges, V. Volovoi","doi":"10.1115/imece2001/ad-23766","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23766","url":null,"abstract":"\u0000 The focus of this paper is to develop an asymptotically correct theory for composite laminated plates when each lamina exhibits monoclinic material symmetry. The development starts with formulation of the three-dimensional, anisotropic elasticity problem in which the deformation of the reference surface is expressed in terms of intrinsic two-dimensional variables. The Variational Asymptotic Method is then used to rigorously split this three-dimensional problem into a linear one-dimensional normal-line analysis and a nonlinear two-dimensional “plate” analysis accounting for transverse shear deformation. The normal-line analysis provides a constitutive law between the generalized, two-dimensional strains and stress resultants as well as recovering relations to approximately express the three-dimensional displacement, strain and stress fields in terms of plate variables calculated in the “plate” analysis. It is known that more than one theory that is correct to a given asymptotic order may exist. This nonuniqueness is used to cast a strain energy functional that is asymptotically correct through the second order into a simple “Reissner-like” plate theory. Although it is true that it is not possible to construct an asymptotically correct Reissner-like composite plate theory in general, an optimization procedure is used to drive the present theory as close to being asymptotically correct as possible while maintaining the beauty of Reissner-like formulation. Numerical results are presented to compare with the exact solution as well as a previous similar yet very different theory. The present theory has excellent agreement with the previous theory and exact results.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114495096","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: 13
Identification of the Damping Matrix 阻尼矩阵的辨识
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23763
M. Baruch
{"title":"Identification of the Damping Matrix","authors":"M. Baruch","doi":"10.1115/imece2001/ad-23763","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23763","url":null,"abstract":"\u0000 Only experiments can provide the data necessary to obtain the damping matrix of a dynamic structural system. In the method proposed here the damping matrix can be separated from the mass and stiffness matrices and obtained in an independent of them way. Two methods are presented. In the first method it is assumed that all the degrees of freedom can be loaded and measured. Several methods for calculation of the damping, mass and stiffness matrices, using the experimental data are presented. In the second method the load is employed only in some chosen points. However, it is assumed again that all the degrees of freedom are measured.\u0000 In order to identify the damping, stiffness and mass matrices of the structure the measured quantities are forced to comply with the general laws for a linear structure.\u0000 The structure is idealized to be a linear dynamic structure with viscous damping. The measured quantities are measured during the tests at discrete points of the Frequency Response Function.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114228550","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: 5
On the Linear Intrinsic Dynamics of Thin Shells 薄壳的线性内在动力学
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23754
A. Libai
{"title":"On the Linear Intrinsic Dynamics of Thin Shells","authors":"A. Libai","doi":"10.1115/imece2001/ad-23754","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23754","url":null,"abstract":"\u0000 Equations for the linear intrinsic dynamics of shells are presented and discussed. The variables in the proposed method are the six strain measures (½ × incremental metric and incremental curvature tensors of the reference surface).\u0000 Two versions are presented. In the “compatibility version”, the field equations are: (a) expressions for the three extensional strain-accelerations in terms of the stress resultants and loads, and (b) the three incremental Gauss and Codazá-Mainardi compatibility equations of the reference surface. Constitutive relations are appended to complete the formulation.\u0000 In the “rate version”, the field equations are expressions for the six strain-accelerations (extensional and bending) in terms of the stress-resultants and loads. Equivalence to the “compatibility version” is shown, provided that the initial conditions are satisfied.\u0000 Two examples are given. In the first, specialization is made to the case of circular cylindrical shells. In the second, an inplane vibration problem of a rectangular plate is studied.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130398678","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
Target Stress Prediction for Durability Analysis 耐久性分析中的目标应力预测
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23768
Zongfen Zhang
{"title":"Target Stress Prediction for Durability Analysis","authors":"Zongfen Zhang","doi":"10.1115/imece2001/ad-23768","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23768","url":null,"abstract":"\u0000 This paper present a methodology to predict target stress under a unit load for a given load schedule, material and geometry analytically. This approach improves the conventional way of doing fatigue and life prediction. This method can be used to any parts/subsystems, which have durability issue. The advantages of knowing the target stress analytically include cost saving in term of hardware reduction and development time saving because the further validation time of design can be shorten. As an example, a decklid global latch design is discussed.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130070546","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
Delamination Effects in Circular Sandwich Plates With Laminated Faces of General Layup and a “Soft” Core 一般铺层和“软”芯层复合圆夹层板的分层效应
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23773
O. Rabinovitch, Y. Frostig
{"title":"Delamination Effects in Circular Sandwich Plates With Laminated Faces of General Layup and a “Soft” Core","authors":"O. Rabinovitch, Y. Frostig","doi":"10.1115/imece2001/ad-23773","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23773","url":null,"abstract":"\u0000 The present study is concerned with the behavior of delaminated circular sandwich plates with a compressible “soft” core and composite laminated face sheets of general layup. The analysis follows the concepts of the High-Order Sandwich Plate Theory and employs the variational principle of virtual work for the derivation of the field equations of the fully bonded and delaminated regions. In the penny shaped disbonded region, the delaminated faces can slip horizontally with respect one to another, yet they may be in contact and resist vertical normal compressive stresses. The compressible core is considered using the 3D theory of elasticity and the lamination theory is employed for the modeling of the composite laminated face sheets. The formulation yields coordinate-dependent constitutive relations and governing equations and the solution procedure adopts the Galerkin method in the circumferential direction and the multiple-points shooting method in the radial direction. Numerical results regarding a typical delaminated sandwich plate are presented in terms of deformations and stresses. The results reveal the effect of the anisotropic laminated face sheets on the response of the structure and the influence of the delamination on the overall and, especially, the localized behavior of the plate.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125874895","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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