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Recent Advances in Solids and Structures最新文献

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Buckling vs. Crack Growth: Numerical Simulation 屈曲与裂纹扩展:数值模拟
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1251
T. Siegmund
{"title":"Buckling vs. Crack Growth: Numerical Simulation","authors":"T. Siegmund","doi":"10.1115/imece2000-1251","DOIUrl":"https://doi.org/10.1115/imece2000-1251","url":null,"abstract":"\u0000 Thin walled structures are characterized by configurations that possess large aspect ratios, i.e. large in-plane dimensions and small thickness dimensions. The present work aims on investigations of the mechanical integrity of such structures thereby focusing on the competition and interaction between global failure due to buckling and local failure due to crack growth.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"34 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":"114549562","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
Dynamic Response of a Heat Damaged Fiber-Resin Beam Subjected to Harmonic Forcing at the Tip 热损伤纤维-树脂梁在末端谐波力作用下的动态响应
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1259
H. Nayeb-Hashemi, A. Harrison
{"title":"Dynamic Response of a Heat Damaged Fiber-Resin Beam Subjected to Harmonic Forcing at the Tip","authors":"H. Nayeb-Hashemi, A. Harrison","doi":"10.1115/imece2000-1259","DOIUrl":"https://doi.org/10.1115/imece2000-1259","url":null,"abstract":"\u0000 A cantilever beam built of fiber-resin composite material and damaged by heat is evaluated for its dynamic response using numerical methods. The goal of research is to produce a diagnostic process in which dynamic response can be used to estimate the severity of damage to the beam. Research proceeds from formulation of the continuous media equations for vibration in a multiply segmented beam, to the development of finite element models for the beam. It is discovered that the results of these two methods are qualitatively different from the predictions of a lumped system model, in that the lumped system predicts that frictional damping should reduce the dominant frequency of vibration while the more elaborated models indicate that damping may increase the dominant frequency. It is further discovered that the size and location of damage (the geometry) are equally as important as the local stiffness and damping of the damaged region (the material properties). The results indicate that the dominant frequency of dynamic response is not a sufficient symptom for complete diagnosis of damage in the beam.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"24 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120850861","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
Modeling and Vibration Feedback Control of Rotating Tapered Beams Incorporating Adaptive Capabilities 结合自适应能力的旋转锥形梁建模与振动反馈控制
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1253
S. Na, L. Librescu
{"title":"Modeling and Vibration Feedback Control of Rotating Tapered Beams Incorporating Adaptive Capabilities","authors":"S. Na, L. Librescu","doi":"10.1115/imece2000-1253","DOIUrl":"https://doi.org/10.1115/imece2000-1253","url":null,"abstract":"\u0000 This paper addresses the problem of the modeling and vibration control of tapered rotating blades modeled as thin-walled beams and incorporating adaptive capabilities. The blade model incorporates non-classical features such as anisotropy, transverse shear, secondary warping and includes the centrifugal and Coriolis force fields.\u0000 For the non-adaptive system, a thorough validation and assessment of a number of nonclassical features including the taper characteristics is accomplished. The adaptive capabilities are provided by a system of piezoactuators bonded or embedded into the structure and spread over the entire span of the beam.\u0000 Based on the converse piezoelectric effect, the piezoactuators produce a localized strain field in response to a voltage and consequently, a change of the dynamic response characteristics is induced. A combined feedback control law relating the piezoelectrically induced transversal bending moment at the beam tip with the kinematical response quantities appropriately selected is used and the beneficial effects upon the closed-loop dynamic characteristics of the blade are highlighted.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"29 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":"129316815","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
Sizing and Topology Optimization of a Chassis Frame 机箱机架尺寸与拓扑优化
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1266
M. Krishna, Andrew Simboli
{"title":"Sizing and Topology Optimization of a Chassis Frame","authors":"M. Krishna, Andrew Simboli","doi":"10.1115/imece2000-1266","DOIUrl":"https://doi.org/10.1115/imece2000-1266","url":null,"abstract":"\u0000 The application of sizing and topology optimization to a complete chassis frame has been undertaken to improve its performance within mass/weight constraints. The static frame stiffness (vertical bending and torsion), the first four modal frequencies and point mobility numbers were targeted for improvement. First, sizing optimization was undertaken to meet frame targets. The gage thicknesses of a number of different components, were allowed to be varied. This resulted in an increase in frame weight. Later topology optimization was undertaken to recommend the area where weight can be taken off without affecting the performance. An MSC NASTRAN optimizer was used for all the analyses.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"1 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":"121164129","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
The Approximate, High Frequency Response of a Panel With Attached Masses 附质量板的近似高频响应
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1271
R. Reynolds
{"title":"The Approximate, High Frequency Response of a Panel With Attached Masses","authors":"R. Reynolds","doi":"10.1115/imece2000-1271","DOIUrl":"https://doi.org/10.1115/imece2000-1271","url":null,"abstract":"\u0000 The high frequency response of a panel with attached masses is approximated using transient, asymptotic modal analysis (AMA). These relations are derived by applying asymptotic simplifications to classical solutions in both the time and frequency domains. The geometry consists of several masses that are attached to a panel to which impulsive excitations are applied. Predictions are made of the mean-squared, transverse displacement history and the localized responses near the added masses. These are compared to classical solutions and it is shown that for a few masses that are separated by more than a mean wavelength, the panel behavior can be estimated well by the AMA expressions. The approximate solutions are shown to require less than 20% of the computational time and memory of the classical solutions and are applicable to general forms of excitation.\u0000 The resulting capability can be used to estimate acoustic emissions from vibrating equipment and to model structure-borne sound and its effects on sensitive equipment.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"126 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":"115641302","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 Equivalence of the Stress and Displacement Methods in Planar Anisotropic Elasticity 平面各向异性弹性力学中应力与位移方法的等价性
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1269
Xin-Lin Gao, R. Rowlands
{"title":"On the Equivalence of the Stress and Displacement Methods in Planar Anisotropic Elasticity","authors":"Xin-Lin Gao, R. Rowlands","doi":"10.1115/imece2000-1269","DOIUrl":"https://doi.org/10.1115/imece2000-1269","url":null,"abstract":"\u0000 The stress formalism of Lekhnitskii and the displacement formalism of Eshelby, Read and Shockley (ERS) are firstly recapitulated and compared for problems of planar anisotropic elasticity. It is explicitly demonstrated that for such problems the two formalisms lead to the identical characteristic equation and thus are equivalent. An alternative displacement formulation method is then presented for the same problems using an extended version of Green’s theorem. This approach introduces a displacement function, which satisfies a fourth-order partial differential equation whose characteristic equation is identical with that obtained using the methods of Lekhnitskii and ERS. The new approach is proved to be equivalent to those of Lekhnitskii and ERS for problems of planar anisotropic elasticity. The present displacement function method exhibits similarities with the Airy stress function method.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"10 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":"126128938","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
Ballistic Impact Analysis of the Human Thorax With a Protective Body Armor 防护衣对人体胸部的弹道冲击分析
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1256
Y. W. Kwon, J. E. Jolly, T. A. Hughes
{"title":"Ballistic Impact Analysis of the Human Thorax With a Protective Body Armor","authors":"Y. W. Kwon, J. E. Jolly, T. A. Hughes","doi":"10.1115/imece2000-1256","DOIUrl":"https://doi.org/10.1115/imece2000-1256","url":null,"abstract":"\u0000 The biomechanical response of a finite element model of the human thorax and a protective body armor system was studied under impact loading from a projectile. The objective of the study was to create a viable finite element model of the human thorax. The model was validated by comparing the results of tests of body armor systems conducted on cadavers to results obtained from finite element analysis. A parametric study was undertaken to determine the essential components of the model. The results from this investigation determined that the path of force propagation from a body armor system to the thorax upon bullet impact is directly through the vest to the sternum and then through the skeleton to the rest of the body. Thus, any parameters that affect the components in this pathway were essential to the model. This included the muscles, their geometries, material properties, and viscosity, as well as the Young’s modulus of the sternochondral cartilage and the bones themselves.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"29 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":"121598098","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
Probabilistic Failure Analysis for Composite Laminates 复合材料层压板的概率失效分析
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1261
P. Herrington, P. Schilling
{"title":"Probabilistic Failure Analysis for Composite Laminates","authors":"P. Herrington, P. Schilling","doi":"10.1115/imece2000-1261","DOIUrl":"https://doi.org/10.1115/imece2000-1261","url":null,"abstract":"\u0000 Considering the increasing applications of composites as structural components, the reliability of these materials is an important issue. Given the inherent variability of the material properties of composites, a probabilistic approach to the design of these materials is required. In this paper, the first-order second-moment method, coupled with the Tsai-Wu interactive failure criterion, is used to determine the reliability of composite laminates under various plane stress conditions. Uncertainty in material and loading parameters are considered. The method considered requires only the first two moments of the basic variables as input. This factor, along with its ease of use, makes this technique attractive to designers. Numerical examples, along with plots of the effect of coefficient of variation on the safety index, are given for a typical glass/epoxy composite.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"27 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113964292","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
Bolt Head Fillet Stress Concentration Factors in Cylindrical Pressure Vessels 圆柱形压力容器螺栓头圆角应力集中系数
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/1.1379530
G. Srinivasan, T. F. Lehnhoff
{"title":"Bolt Head Fillet Stress Concentration Factors in Cylindrical Pressure Vessels","authors":"G. Srinivasan, T. F. Lehnhoff","doi":"10.1115/1.1379530","DOIUrl":"https://doi.org/10.1115/1.1379530","url":null,"abstract":"\u0000 Linear three-dimensional finite element analysis (FEA) was performed on bolted pressure vessel joints to determine maximum stresses and stress concentration factors in the bolt head fillet as a result of the prying action. The three-dimensional finite element models consisted of a segment of the flanges containing one bolt, using cyclic symmetry boundary conditions. The flanges were each 20 mm in thickness with 901.7 mm inner diameter. The outer flange diameter was varied from 1021 mm to 1041 mm in steps of 5 mm. The bolt circle diameter was varied from 960.2 mm to 980.2 mm in steps of 5 mm. The bolts used were 16 mm diameter metric bolts with standard head and nut thickness. The threads were not modeled. The internal vessel pressure was 0.6895 MPa (100 psi).\u0000 Stress concentration factors in the bolt head fillet were calculated and they ranged from 3.34 to 4.80. The maximum stress in the bolt as well as the stress concentration factors in the bolt head fillet increase with an increase in bolt circle diameter for a given outer flange dimension. Keeping the bolt circle diameter constant, bolt stress and stress concentration factors in the bolt head fillet decrease with increase in outer flange diameter. The maximum stresses in the bolt were also calculated according to the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code and the Verein Deutscher Ingenieur (VDI) guidelines and compared to the results observed through finite element analysis. The stresses obtained through FEA were larger than those predicted by the ASME and VDI methods by a factor that ranged between 2.96 to 3.41 (ASME) and 2.76 to 3.63 (VDI).","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"28 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":"133977519","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: 14
Yield Function for Structural Porous Metals 结构多孔金属的屈服函数
Recent Advances in Solids and Structures Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1264
M. K. Alam, Shatil S. Ahmed, Rex J. Kuriger
{"title":"Yield Function for Structural Porous Metals","authors":"M. K. Alam, Shatil S. Ahmed, Rex J. Kuriger","doi":"10.1115/imece2000-1264","DOIUrl":"https://doi.org/10.1115/imece2000-1264","url":null,"abstract":"\u0000 To reduce weight while maintaining high specific strength, Structural Porous Metals (SPM) are being developed. These materials are alloys containing an inert gas in distributed pores at very high pressures. The pores of gas are incorporated into SPM during processing. Since the pores are closed pores at high pressures, the material can be processed by standard methods such as rolling or forging without collapsing the gas pores. These materials must be treated as a composite material with special deformation behavior under applied stresses. It should be noted that, unlike solids, shear stresses can not be present in a gas medium in static equilibrium. This paper deals with the determination of the yield stress of structural porous metals. The yield function is calculated from the principle of virtual work. In this approach it is assumed that a constant amount of energy needed to deform the material to the yield point. In the case of SPM, the yield function must include the work needed to deform the gas pores as the material yields. The energy of deformation for the gas in the pores is evaluated according to the ideal gas law. The total work done in deforming the gas and the solid metal is taken into account in determination of the yield function of SPM. The result of the analysis is then compared with classic yield functions for monolithic alloys.","PeriodicalId":270413,"journal":{"name":"Recent Advances in Solids and Structures","volume":"45 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":"122545683","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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