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Three-Dimensional Effects in Composite and Sandwich Structures最新文献

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Effect of Loading Conditions on Deformation and Failure of Composite Sandwich Structures 加载条件对复合材料夹层结构变形破坏的影响
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25412
I. Daniel, E. Gdoutos, J. Abot, K. A. Wang
{"title":"Effect of Loading Conditions on Deformation and Failure of Composite Sandwich Structures","authors":"I. Daniel, E. Gdoutos, J. Abot, K. A. Wang","doi":"10.1115/imece2001/amd-25412","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25412","url":null,"abstract":"\u0000 An investigation was conducted of failure modes and criteria for their occurrence in composite sandwich columns and beams. The initiation of the various failure modes depends on the material properties of the constituents (facings and core), geometric dimensions and type of loading. The loading type or condition determines the state of stress throughout the sandwich structure, which controls the location and mode of failure. The appropriate failure criteria at any point of the structure account for the biaxiality or triaxiality of the state of stress. The specimens were made of unidirectional carbon/epoxy facings and aluminum honeycomb and PVC closed-cell foam cores. The constituent materials were fully characterized and, in the case of the foam core, failure envelopes were developed for general two-dimensional states of stress. Sandwich specimens were loaded under bending moment, shear and axial loading and failure modes were observed and compared with analytical predictions. The failure modes investigated are face sheet compressive failure, adhesive bond failure, indentation failure, core failure and facing wrinkling. The transition from one failure mode to another for varying loading or state of stress was discussed. Experimental results were compared with analytical predictions.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"178 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":"128162052","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
Interactive Buckling of Sandwich Plates Under Compression 夹层板在压缩作用下的相互作用屈曲
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25420
S. Sridharan, Kim Sunjung, S. El-Sayed
{"title":"Interactive Buckling of Sandwich Plates Under Compression","authors":"S. Sridharan, Kim Sunjung, S. El-Sayed","doi":"10.1115/imece2001/amd-25420","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25420","url":null,"abstract":"\u0000 Compressive behavior of two classes of “sandwich” structures is investigated. These structures have for their principal load bearing components two relatively stiff parallel horizontal sheets which are interconnected in one of the following ways: (i) by a highly compliant core material such as foam, or (ii) a set of discrete stiffeners connecting the parallel (top and bottom) sheets. In case (i), the structure can buckle in either a local mode in which the core and the facing bend together or a wrinkling mode in which the facing sheet undergoes severe bending with the core subjected to deformation in the transverse plane. It is found that these plates have neither post buckling stiffness nor do they exhibit any imperfection-sensitivity. In case (ii) the point of principal interest is the interaction of local and overall buckling. For the case of coincident local and overall buckling, it is found that 30% reduction in the maximum load can occur for modest levels of imperfections as a result of modal interaction.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"39 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":"125175211","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
Three-Dimensional Elasticity Solution for the Buckling of Sandwich Columns 夹层柱屈曲的三维弹性解
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25414
G. Kardomateas
{"title":"Three-Dimensional Elasticity Solution for the Buckling of Sandwich Columns","authors":"G. Kardomateas","doi":"10.1115/imece2001/amd-25414","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25414","url":null,"abstract":"\u0000 A study of the buckling of a sandwich column, based on the three dimensional theory of elasticity, and a comparison with the simple Euler or transverse shear correction Engesser / Haringx / Timoshenko column buckling formulas, is presented. All three phases of the sandwich structure (two face sheets and the core) are assumed to be orthotropic and the column is in the form of a hollow circular cylinder. The Euler or Engesser / Haringx / Timoshenko loads are based on the equivalent axial modulus. Representative results show the significance of the effect of transverse shear in these sandwich structures.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"34 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":"134397664","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
Size Effect in Fracture of Sandwich Structure Components: Foam and Laminate 夹层结构构件断裂的尺寸效应:泡沫和层压板
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25413
Z. Bažant, Yong Zhou, D. Novák, I. Daniel
{"title":"Size Effect in Fracture of Sandwich Structure Components: Foam and Laminate","authors":"Z. Bažant, Yong Zhou, D. Novák, I. Daniel","doi":"10.1115/imece2001/amd-25413","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25413","url":null,"abstract":"\u0000 In the design of sandwich plates and shells for very large structures, such as ships in the range of 100 m length, it is very important to take the size effect on the nominal strength into account, and do so in a realistic, physically justified, manner. Before the size effect is addressed for a sandwich structure, it must be understood for its components — the foam core and the laminate skins. In the current practice, the size effects are automatically attributed to the randomness of material strength, as described by the Weibull theory. The purpose of this paper is to show that in both the foam and the laminate there are deterministic size effects, which are generally more pronounced. They are caused by stress redistribution and energy release due to the growth of large fractures or large cracking zones prior to attaining the maximum load. This deterministic size effect is verified and calibrated by new tests of notched specimens of rigid close-cell vinyl foam. A combined deterministic-probabilistic theory of size effect of the laminates is proposed and verified by extensive test data.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"286 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":"131419139","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: 12
Damage Control in Composite Laminates 复合材料层合板的损伤控制
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25421
A. Suvorov, G. Dvorak
{"title":"Damage Control in Composite Laminates","authors":"A. Suvorov, G. Dvorak","doi":"10.1115/imece2001/amd-25421","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25421","url":null,"abstract":"\u0000 Several effects that fiber prestress may have on stress redistribution in the plies of composite laminates and in the phases of individual plies are illustrated. These include improvement of composite damage resistance under tensile mechanical loads, reduction/cancelation of interlaminar stresses at free edges of composite laminate subjected to thermomechanical loading, and stress relaxation in the matrix phase of viscoelastic composite laminates. Specific results are found for quasi-isotropic and cross-ply symmetric S-glass/epoxy and carbon/epoxy AS4/EPON 828 laminates.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"91 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":"134508642","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
Flexural Fatigue of PVC Foams 聚氯乙烯泡沫材料的弯曲疲劳
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25415
K. Kanny, H. Mahfuz, L. Carlsson, Tonnia Thomas, S. Jeelani
{"title":"Flexural Fatigue of PVC Foams","authors":"K. Kanny, H. Mahfuz, L. Carlsson, Tonnia Thomas, S. Jeelani","doi":"10.1115/imece2001/amd-25415","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25415","url":null,"abstract":"\u0000 Flexural fatigue tests were performed on cross-linked PVC foams of densities in the range from 75 to 300 kg/m3 at a frequency of 3Hz and at a stress ratio, R = 0.1. S-N diagrams were generated, and the failure mechanisms were examined. The fatigue behavior was found to be similar to structural materials with a fatigue strength that decreased with increased stress and increased with increased foam density. The final failure event was catastrophic due to crack propagation initiating at the tension side of the beam. SEM analyses of unfailed and failed 300kg/m3 density foam specimens revealed cell wall cracking and densification of the foam. The densification contributed to stiffening of foam specimens. Viscoelastic parameters of the foams were determined at room temperature using a Dynamic Mechanical Analyzer (DMA) over a frequency range of 1–10Hz. For the virgin specimens it was found that the viscoelastic moduli and damping ratio were quite independent of frequency over this range of frequencies. Except for the lowest density foam (75kg/m3), the damping ratio was quite independent of foam density.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"41 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":"124021240","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
Effects of Material Failure on Buckling Behaviour of Medium-Thick GFRP Cylindrical Shells for Submarine Applications 材料失效对潜艇用中厚玻璃钢圆柱壳屈曲行为的影响
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25419
V. Carvelli, N. Panzeri, C. Poggi
{"title":"Effects of Material Failure on Buckling Behaviour of Medium-Thick GFRP Cylindrical Shells for Submarine Applications","authors":"V. Carvelli, N. Panzeri, C. Poggi","doi":"10.1115/imece2001/amd-25419","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25419","url":null,"abstract":"\u0000 The paper is concerned with the interaction of buckling and material failure in composite cylindrical shells subject to external pressure. A methodology for the numerical prediction of the strength of composite shells is discussed and an application is presented. The results of an experimental and numerical research on a composite shell structure, intended as a model for an under-water vehicle for service in deep-sea environment, are recalled. It is showed how a reasonable prediction of the buckling pressure can be obtained only including the effects of the geometric imperfections. The validated finite element model is then adopted for a parametric study on the influence of the thickness variation on the failure behaviour of cylinders. A well-known failure criteria for composite laminates (Tsai-Wu) is introduced in the model to study the interaction between buckling and material failure in composite cylinders subject to hydrostatic pressure. The values of the pressure obtained with linear buckling, first-ply and progressive failure analysis with or without geometric effects are discussed for a specific composite cylinder.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"59 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":"117035915","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
The Effect of Stitching on Compression Behavior of Stiffened Composite Panels 拼接对加筋复合板压缩性能的影响
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25416
S. S. Suh, H. Hahn, N. Han, Jenn‐Ming Yang
{"title":"The Effect of Stitching on Compression Behavior of Stiffened Composite Panels","authors":"S. S. Suh, H. Hahn, N. Han, Jenn‐Ming Yang","doi":"10.1115/imece2001/amd-25416","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25416","url":null,"abstract":"\u0000 Failure of stiffened panels under compression is preceded by buckling of their skin and hence is affected by the presence of out-of-plane stresses. One of the promising methods of preventing premature delamination is stitching. The present paper discusses the effect of such stitching on compression behavior of blade-stiffened panels that were fabricated from plain weave AS4/3501-6 through resin film infusion process. Kevlar 29 yarn was used at a stitch density of 9.92 stitches per cm2. Some of the panels were damaged by drop-weight impact before compression testing. For comparison purposes unstitched panels with the same materials and dimensions were also tested under the same loading conditions. Stitching resulted in a 10% improvement in strength in the absence of any intentional damage. The beneficial effect of stitching was most obvious when the panels were impacted on a flange: a 50% improvement was observed in post-impact strength. However, stitching could not prevent stiffener from failure when impacted directly. Thus stitching had no beneficial effect when impact occurred on a stiffener. A buckling and post-buckling analysis was carried out using 3-D shell elements on the Abaqus. Predictions were in fairly good agreement with the experimental data.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"22 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":"131663620","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
Evolution of Interfacial Decohesion in Particulate Composites 颗粒复合材料界面脱黏的演化
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25418
G. Dvorak, Jian Zhang
{"title":"Evolution of Interfacial Decohesion in Particulate Composites","authors":"G. Dvorak, Jian Zhang","doi":"10.1115/imece2001/amd-25418","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25418","url":null,"abstract":"\u0000 Evolution of distributed damage in heterogeneous solids is modeled using the Transformation Field Analysis method [Proc. R. Soc. Lond. A (1992) 437, 311–327] and selected models of interface debonding in fibrous or particulate composites, as described in detail in the forthcoming paper [J. Mech. Phys. Solids Boehler Memorial Volume, 2001]. In this approach, stress changes caused by local debonding under increasing overall loads are represented by residual stresses generated by damage-equivalent eigenstrains that act together with the applied mechanical loading program and physically based local transformation strains on an undamaged elastic aggregate. Damage rates are derived from a prescribed probability distribution of interface strength and local energy released by debonding. Numerical simulations of damage evolution in a glass/elastomer composite indicate which of these two conditions controls the process at different reinforcement densities and overall stress states. In general, the energy released by a single particle at given overall stress decreases with increasing reinforcement density, and in proportion to particle size. Therefore, dense reinforcement by smaller-diameter particles or fibers should enhance damage resistance of composite systems.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","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":"126112551","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 Failure Mechanisms in 3D Cellular Woven Composite Systems 三维细胞编织复合材料系统的动态失效机制
Three-Dimensional Effects in Composite and Sandwich Structures Pub Date : 2001-11-11 DOI: 10.1115/imece2001/amd-25422
J. N. Baucom, M. Zikry, Y. Qiu
{"title":"Dynamic Failure Mechanisms in 3D Cellular Woven Composite Systems","authors":"J. N. Baucom, M. Zikry, Y. Qiu","doi":"10.1115/imece2001/amd-25422","DOIUrl":"https://doi.org/10.1115/imece2001/amd-25422","url":null,"abstract":"\u0000 The role of porosity on failure resistance of 3-D woven fiber reinforced epoxy panels under dynamic loading condition is investigated. Incident and residual velocities are measured to determine the energy absorption by the target. Material behavior segregates by porosity, and the more highly porous samples absorb a greater amount of specific energy. The reason for this may be due to the deflection of matrix cracks by pores or due to the greater flexibility of the fibers to absorb energy through tensile straining. Although porosity is generally an undesirable property in textile composites, the induction of porosity may result in reduced panel weight without degradation of ballistic performance, which is a clear advantage for weight minimization.","PeriodicalId":445232,"journal":{"name":"Three-Dimensional Effects in Composite and Sandwich Structures","volume":"55 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":"131910790","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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