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Contemporary Research in Engineering Mechanics最新文献

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Free Lateral Vibration of Columns and Beams With Arbitrary Thin-Walled Cross Sections 任意薄壁截面柱和梁的自由横向振动
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23756
C. Bert
{"title":"Free Lateral Vibration of Columns and Beams With Arbitrary Thin-Walled Cross Sections","authors":"C. Bert","doi":"10.1115/imece2001/ad-23756","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23756","url":null,"abstract":"\u0000 This paper surveys the literature on vibration of axially loaded beams in general, and thin-walled, open-section beams with and without axial load. Finally, for what is believed to be the first time, a solution is presented for the problem of vibration of a thin-walled beam subject to transverse preload.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"13 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":"124696914","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
Damping in Unidirectional and Cross-Ply Ceramic Matrix Composites With Matrix Cracks 具有基体裂纹的单向和交叉层陶瓷基复合材料的阻尼
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23775
V. Birman, L. Byrd
{"title":"Damping in Unidirectional and Cross-Ply Ceramic Matrix Composites With Matrix Cracks","authors":"V. Birman, L. Byrd","doi":"10.1115/imece2001/ad-23775","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23775","url":null,"abstract":"\u0000 The paper elucidates the methods of estimating damping in ceramic matrix composites (CMC) with matrix cracks. Unidirectional composites with bridging matrix cracks and cross-ply laminates with tunneling cracks in transverse layers and bridging cracks in longitudinal layers are considered. It is shown that bridging matrix cracks may dramatically increase damping in unidirectional CMC due to a dissipation of energy along damaged sections of the fiber-matrix interface (interfacial friction). Such friction is absent in the case of tunneling cracks in transverse layers of cross-ply laminates where the changes in damping due to a degradation of the stiffness remain small. However, damping in cross-ply laminates abruptly increases if bridging cracks appear in the longitudinal layers.","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":"132127047","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
Core Failure Modes in Composite Sandwich Beams 复合材料夹层梁的核心失效模式
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23776
I. Daniel, E. Gdoutos, J. Abot, K. A. Wang
{"title":"Core Failure Modes in Composite Sandwich Beams","authors":"I. Daniel, E. Gdoutos, J. Abot, K. A. Wang","doi":"10.1115/imece2001/ad-23776","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23776","url":null,"abstract":"\u0000 Core failure modes were studied in composite sandwich beams under three-point bending and in cantilever beams under end loading. The beams consisted of unidirectional carbon/epoxy face sheets and a variety of core materials, including aluminum honeycomb, PVC closed-cell foams, polyurethane foam and balsa wood. The constituent materials were fully characterized and in the case of the core materials, failure envelopes were developed for biaxial states of stress. Deformation and failure mechanisms were studied experimentally by means of moiré gratings and birefringent coatings. Results were obtained for stress (strain) distributions in the linear and nonlinear/plastic range of the core, critical failure loads and their dependence on geometrical dimensions, material parameters and loading conditions.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"65 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":"133266795","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: 6
Dynamic Buckling of 1-DOF Autonomous Potential Systems Under Tilted Cusp Catastrophe 倾斜尖突变下1自由度自主势系统的动态屈曲
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23755
A. Kounadis
{"title":"Dynamic Buckling of 1-DOF Autonomous Potential Systems Under Tilted Cusp Catastrophe","authors":"A. Kounadis","doi":"10.1115/imece2001/ad-23755","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23755","url":null,"abstract":"\u0000 Nonlinear dynamic buckling of one-degree-of freedom (1-DOF) undamped systems under step loading (autonomous systems) of constant direction and infinite duration is discussed in detail using Catastrophe Theory. Attention is focused on the relation of static cuspoind catastrophes to the corresponding dynamic catastrophes for 1-DOF autonomous undamped systems by determining properly the dynamic singularity and bifurcational sets for such systems. Using local analysis one has to classify first the total potential energy (TPE) function of the system into one of the elementary Thom’s catastrophes by defining the corresponding control (unfolding) parameters. Subsequently, using global analyses one can readily obtain exact results for the dynamic buckling loads (DBLs) and their imperfection sensitivity of systems subjected to dynamic dual cusp and tilted cusp catastrophes. It was found that the maximum DBL of the dynamic tilted cusp catastrophe corresponds to a limit point lying in the vicinity of the hysteresis point (related to the static tilted cusp catastrophe). Numerical examples illustrate the methodology proposed herein.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"25 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":"124901696","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
Thermo-Mechanical Instabilities in Bilaminate Shell Structures 双酰胺壳结构的热-机械不稳定性
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23770
W. Bottega, S. E. Rutgerson
{"title":"Thermo-Mechanical Instabilities in Bilaminate Shell Structures","authors":"W. Bottega, S. E. Rutgerson","doi":"10.1115/imece2001/ad-23770","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23770","url":null,"abstract":"\u0000 The problem of an elastic bilaminate shell subjected to transverse pressure and a uniform temperature field is considered for plane strain/plane stress configurations. Closed form analytical solutions are obtained for the nonlinear problem, and a stability criterion is derived for situations where multiple equilibrium configurations of the structure are possible for a given value of the loading parameter (a combination of the normalized pressure and thermal moment). Critical behavior is seen to be dependent on two critical parameters, a critical value of the loading parameter and a critical value of the membrane force. Extensive numerical simulations based on these solutions reveal characteristic behavior of the system. This behavior includes, bifurcation buckling, asymptotic buckling, sling-shot buckling and pre-limit point snap-through buckling. It is seen that pre-limit point snap-through is pervasive and perhaps the norm, even for certain classic problems, and its degree is a function of the material properties of the structure.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"111 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":"123095853","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
Free Vibrations of Composite Shallow Circular Cylindrical Shell Panels With a Bonded Central Stiffening Shell Strip 中心加劲壳带复合材料浅圆圆柱壳板的自由振动
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23757
U. Yuceoglu, V. Özerciyes
{"title":"Free Vibrations of Composite Shallow Circular Cylindrical Shell Panels With a Bonded Central Stiffening Shell Strip","authors":"U. Yuceoglu, V. Özerciyes","doi":"10.1115/imece2001/ad-23757","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23757","url":null,"abstract":"\u0000 This study is concerned with the “Free Vibrations of Composite Shallow Circular Cylindrical Shells or Shell Panels with a Central Stiffening Shell Strip”. The upper and lower shell elements of the stiffened composite system are considered as dissimilar, orthotropic shallow shells. The upper relatively narrow stiffening shell strip is centrally located and adhesively bonded to the lower main shell element In the theoretical formulation, a “First Order Shear Deformation Shell Theory (FSDST)” is employed. The complete set of the shallow shell dynamic equations (including the stress resultant-displacement and the constitutive equations) and the equations of the thin flexible, adhesive layer are first reduced to a set of first order system of ordinary differential equations. This final set forms the governing equations of the problem. Then, they are integrated by means of the “Modified Transfer Matrix Method”. In the adhesive layer, the “hard” and the “soft” adhesive effects are considered. It was found that the material characteristics of the adhesive layer influence the mode shapes and the corresponding natural frequencies of the composite shallow shell panel system. Additionally, some parametric studies on the natural frequencies are presented.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"18 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":"123846135","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
Piezoelectric Bending Control of Nonlinear Viscoelastic Plates: Probabilities of Failure and Survival Times 非线性粘弹性板的压电弯曲控制:失效概率和存活时间
Contemporary Research in Engineering Mechanics Pub Date : 2001-11-11 DOI: 10.1115/imece2001/ad-23758
H. Hilton, D. Kubair, C. Beldica
{"title":"Piezoelectric Bending Control of Nonlinear Viscoelastic Plates: Probabilities of Failure and Survival Times","authors":"H. Hilton, D. Kubair, C. Beldica","doi":"10.1115/imece2001/ad-23758","DOIUrl":"https://doi.org/10.1115/imece2001/ad-23758","url":null,"abstract":"\u0000 Analytical and numerical formulations and simulations are carried out in order to conduct sensitivity studies of physical parameters motion and amplitude control by viscoelastic piezoelectric and material damping of viscoelastic plates. Numerical simulations in terms of critical parameters, such as relaxation functions of the structure and piezoelectric devices, are carried out to evaluate system responses, sensing and structural control.","PeriodicalId":136170,"journal":{"name":"Contemporary Research in Engineering Mechanics","volume":"37 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":"129661991","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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