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Contemporary Research in Engineering Mechanics最新文献

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Global Buckling and Initial Post-Buckling Behavior of Sandwich Beams Including Transverse Shear 含横向剪切的夹层梁整体屈曲及初始后屈曲行为
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23767
G. Kardomateas
{"title":"Global Buckling and Initial Post-Buckling Behavior of Sandwich Beams Including Transverse Shear","authors":"G. Kardomateas","doi":"10.1115/imece2001/ad-23767","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23767","url":null,"abstract":"\u0000 An asymptotic solution is presented for the buckling and initial postbuckling behavior of sandwich beams. The effect of transverse shear is included and the shear correction is calculated from energy equivalency. The asymptotic procedure is based on the nonlinear beam equation (with transverse shear included) and closed form solutions are derived for the critical loas and for the load and mid-point delamination deflection and axial shortening versus applied compressive load during the initial postbuckling phase. Illustrative results are presented for a few typical sandwich construction configurations, in particular with regard to the effect of face sheet and core material system.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"3 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":"127692359","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
On the Role of the Shell Theory in Analyzing the Sensitivity of Laminated Cylindrical Shells to Imperfection 论壳理论在层合圆柱壳缺陷敏感性分析中的作用
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23772
I. Sheinman, Y. Goldfeld
{"title":"On the Role of the Shell Theory in Analyzing the Sensitivity of Laminated Cylindrical Shells to Imperfection","authors":"I. Sheinman, Y. Goldfeld","doi":"10.1115/imece2001/ad-23772","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23772","url":null,"abstract":"\u0000 Due to the importance of the imperfection sensitivity behavior of laminated cylindrical shells, an investigation of the accuracy of three different shell theories, namely: Donnell’s, Sanders’ and Timoshenko’s is carried out. The results show that the adopted theory plays an important role in terms of the characteristic and level of sensitivity.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"6 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":"116239472","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
A Box Beam Testbed Structure for Evaluating Elastic Tailoring With Composites 评价复合材料弹性裁剪的箱梁试验台结构
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23765
L. Rehfield
{"title":"A Box Beam Testbed Structure for Evaluating Elastic Tailoring With Composites","authors":"L. Rehfield","doi":"10.1115/imece2001/ad-23765","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23765","url":null,"abstract":"\u0000 Elastic tailoring refers to the use of composite materials to create structures with passive self-deformation control. These structures often exhibit globally coupled modes of deformation which are unusual. Examples are bend-twist and extension-twist in beam-like structures. Illustrations are presented which show that tailored configurations must be examined with care. If the structure is optimized for a particular mode of behavior, such as bend-twist or extension-twist, and is subjected to secondary loads of an unanticipated type, unwanted or unexpected behaviors may result which can significantly alter response. Situations such as this may be avoided by choosing configurations free of undesirable elastic couplings. One such configuration is the box beam model advocated as a testbed in the present paper.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"12 4 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":"115965213","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 Mechanics and Buckling Analysis of Composite Shells With Embedded Piezoelectric Actuators and Sensors 嵌入压电致动器和传感器的复合材料壳体非线性力学及屈曲分析
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23762
D. Varelis, D. Saravanos
{"title":"Nonlinear Mechanics and Buckling Analysis of Composite Shells With Embedded Piezoelectric Actuators and Sensors","authors":"D. Varelis, D. Saravanos","doi":"10.1115/imece2001/ad-23762","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23762","url":null,"abstract":"\u0000 Nonlinear mechanics for piezoelectric composite laminates and shells are presented which include nonlinear effects due to large displacements and rotations. The mechanics are incorporated into the mixed piezoelectric laminate theory. Using the mechanics, a nonlinear finite element method and an incremental solution are formulated for the nonlinear analysis of adaptive shell structures. An eight-node shell finite element is developed. The mechanics are applied to predict the buckling of laminated piezoelectric shells induced by combined electromechanical loading. Application cases quantify the mechanical buckling of composite circular beams and cylindrical panels with piezoelectric sensors, the piezoelectric buckling of active circular beams and shells, and the feasibility of active buckling compensation.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"18 5 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":"126244716","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
Free Vibration of Sandwich Flat Panels With Laminated Anisotropic Face Sheets 各向异性夹层面板的自由振动
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23759
T. Hause, L. Librescu
{"title":"Free Vibration of Sandwich Flat Panels With Laminated Anisotropic Face Sheets","authors":"T. Hause, L. Librescu","doi":"10.1115/imece2001/ad-23759","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23759","url":null,"abstract":"\u0000 A study of the effect of anisotropy of face-sheets and of other physical/geometrical parameters on eigenfrequency characteristics of flat sandwich panels is presented. The study is carried out in the context of an advanced model of sandwich structures. A detailed analysis of the influence of a large number of parameters associated with the panel geometry, fiber orientation and stacking sequence in the face sheets, and material properties of the core is accomplished, and pertinent conclusions are outlined. Validations of frequency predictions obtained within the present structural model against the few ones available in the specialized literature are accomplished, and excellent agreements are reported.","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":"125829729","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
Buckling of Shear-Deformable Multi-Layered Rings due to Fluid-Pressure Loading 剪切变形多层环在流体压力载荷下的屈曲
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23764
J. McNamara, Li Liu, A. Waas
{"title":"Buckling of Shear-Deformable Multi-Layered Rings due to Fluid-Pressure Loading","authors":"J. McNamara, Li Liu, A. Waas","doi":"10.1115/imece2001/ad-23764","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23764","url":null,"abstract":"\u0000 This paper is concerned with the analysis of composite rings subjected to external fluid pressure loading. Nonlinear equilibrium equations, linear stability equations, and critical fluid-pressure loads are found for thin multi-layered shear deformable rings. The extensions presented here can be shown to be generalizations of the theory given in [1]. The theory shows that introduction of multiple layers of material introduces coupling between bending and extension. The results are used to show that shear deformation is important when R h < 10 , as well as when the ratio of through thickness shear modulus to Young’s modulus becomes small. The latter has consequences when composite materials are used for the ring layers. The results are also used to show that for coupling between bending and extension the critical fluid-pressure will increase or decrease depending on the stacking sequence. For the example presented in this paper, the predicted critical fluid-pressure loading was higher for the stiffer material located on the inside of a two-layer ring. In all cases, the theoretical results are compared to a finite element method analysis.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"244 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":"134145390","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
Analysis of a New Paper Feeder Design 一种新型送纸机设计分析
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23771
D. Shaw, Weimin Chi
{"title":"Analysis of a New Paper Feeder Design","authors":"D. Shaw, Weimin Chi","doi":"10.1115/imece2001/ad-23771","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23771","url":null,"abstract":"\u0000 A new paper feeder design of an apparatus that need a sheet of paper is proposed in this study. The weak point of a patented paper feeder was point out in this study. To improve that weak point, a new design including two arms, four gears and a slider was developed. The paper feeding mechanism of this study depends on the buckling of the paper sheet. Therefore, the buckling of a paper sheet is a very important parameter of designing the paper feeder. To make the design correct, a theoretical buckling model of the paper was developed. The analysis results were compared with the experiment results. Finally, the new design of best performance was presented.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"45 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":"127388646","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
Importance of Seismic SSI in 3-D Tunnels Assuming Inelastic Material Behavior 假定非弹性材料特性的三维隧道地震SSI的重要性
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23774
G. Hatzigeorgiou, D. Beskos
{"title":"Importance of Seismic SSI in 3-D Tunnels Assuming Inelastic Material Behavior","authors":"G. Hatzigeorgiou, D. Beskos","doi":"10.1115/imece2001/ad-23774","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23774","url":null,"abstract":"\u0000 This paper investigates the importance of seismic soil-structure interaction in three-dimensional lined tunnels, assuming inelastic material behavior for both the concrete liner and the soft rock type of soil. The seismic response of the soil-structure system is obtained by the finite element method in the time domain. Viscous absorbing boundaries are used in conjunction with the discretization of the rock medium. Both the rock medium and the concrete liner are assumed to behave inelastically on the basis of the continuum damage mechanics theory. The seismic waves are assumed to have any arbitrary time variation and direction of propagation. The system is analysed with and without soil-structure interaction in order to assess its importance on the response of the system.","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":"117142036","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: 1
Computational Micro-Mechanical Model of Composite and Flexible Woven Fabric With Fiber Reorientation 纤维定向复合柔韧机织物细观力学计算模型
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23779
A. Tabiei, I. Ivanov
{"title":"Computational Micro-Mechanical Model of Composite and Flexible Woven Fabric With Fiber Reorientation","authors":"A. Tabiei, I. Ivanov","doi":"10.1115/imece2001/ad-23779","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23779","url":null,"abstract":"\u0000 This work presents a computational material model of flexible woven fabric for finite element impact analysis and simulation. The model is implemented in the nonlinear dynamic explicit finite element code LSDYNA. The material model derivation utilizes the micro-mechanical approach and the homogenization technique usually used in composite material models. The model accounts for reorientation of the yarns and the fabric architecture. The behavior of the flexible fabric material is achieved by discounting the shear moduli of the material in free state, which allows the simulation of the trellis mechanism before packing the yams. The material model is implemented into the LSDYNA code as a user defined material subroutine. The developed model and its implementation is validated using an experimental ballistic test on Kevlar® woven fabric. The presented validation shows good agreement between the simulation utilizing the present material model and the experiment.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"16 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":"128049520","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
A Bodner Type of Material Model for the Description of Foam Properties 一种描述泡沫性能的博德纳型材料模型
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23769
Yuzhao Song, Ziqi Chen
{"title":"A Bodner Type of Material Model for the Description of Foam Properties","authors":"Yuzhao Song, Ziqi Chen","doi":"10.1115/imece2001/ad-23769","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23769","url":null,"abstract":"\u0000 A unified constitutive equation has been used to represent Foam material. It can describe the large compression strain, compression strain rate, tension strain and the bottom out behavior of various foams. The material has been incorporated into LS-DYNA, an explicit finite element code widely used in the automobile industry. An example is given to show an application of the material model in a low speed impact finite element analysis.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"30 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":"132228963","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: 1
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