Journal of Sandwich Structures & Materials最新文献_第9页

A nondestructive approach to predict buckling load of composite lattice-core sandwich conical shells based on vibration correlation technique 基于振动相关技术的复合材料格芯夹层锥形壳屈曲载荷无损预测方法

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-28 DOI: 10.1177/10996362221122020

Mehdi Zarei, G. Rahimi

{"title":"A nondestructive approach to predict buckling load of composite lattice-core sandwich conical shells based on vibration correlation technique","authors":"Mehdi Zarei, G. Rahimi","doi":"10.1177/10996362221122020","DOIUrl":"https://doi.org/10.1177/10996362221122020","url":null,"abstract":"In this paper the vibration correlation technique (VCT) has been used as a nondestructive method for predicting the buckling load of the composite lattice-core sandwich conical shells. This technique is capable of predicting the buckling load of different structures without reaching the failure point through modal testing. The composite lattice-core sandwich conical shell has been fabricated using a filament winding process. To perform the expriment, the fundamental natural frequency of the specimen is measured under stepped axial compression loading. The procedure is followed up without actually reaching the instability point when the structure collapses and is no longer usable. A finite element model has also been built in ABAQUS in order to determine the correlation between natural frequency and applied compressive load. A comparison of the results indicated that the VCT has provided a reliable estimate of the buckling load of composite lattice-core sandwich conical shells, especially when the structure is loaded up to at least 66% of the experimental buckling load and accuracy of the VCT decreases when the maximum load is lower than 43% of the buckling load. Results also revealed that the linear fitted curve is unsuitable for the correlation between frequency of vibration and applied load in order to predict buckling load.","PeriodicalId":17215,"journal":{"name":"Journal of Sandwich Structures & Materials","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2022-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44975665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis methodology for the assessment of unvented honeycomb sandwich structures subject to in-plane and pressure loads 无排气蜂窝夹层结构在面内和压力载荷作用下的分析方法

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-25 DOI: 10.1177/10996362221122701

Sean P. Engelstad, Z. Chen, V. Goyal

引用次数: 0

Numerical modeling of flatwise energy absorption behavior of 3D woven honeycomb composites with different cell structures 不同蜂窝结构三维编织蜂窝复合材料平面吸能行为的数值模拟

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-20 DOI: 10.1177/10996362221122047

Lekhani Tripathi, S. Behera, B. Behera

引用次数: 6

Sandwich structure with negative Poisson’s ratio of periodic rectangular tube: Mechanical properties and energy absorption 周期矩形管负泊松比夹层结构的力学性能和能量吸收

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-17 DOI: 10.1177/10996362221122056

Xin Liu, Peiyan Yang, Ye Yuan, J. Qu

{"title":"Sandwich structure with negative Poisson’s ratio of periodic rectangular tube: Mechanical properties and energy absorption","authors":"Xin Liu, Peiyan Yang, Ye Yuan, J. Qu","doi":"10.1177/10996362221122056","DOIUrl":"https://doi.org/10.1177/10996362221122056","url":null,"abstract":"Due to its unique deformation form, Negative Poisson’s ratio sandwich structure has excellent energy absorption, but the low load capacity limits its engineering applications. In this paper, we design a new negative Poisson’s ratio rectangular tube periodic sandwich structure. There are many beams in this structure which appear plastic hinges when compressed. After further compression, the rectangular tube wall buckles and the core shrinks inward, which realizes that the structure exhibits high-performance energy absorption ability and excellent mechanical properties. Three-dimensional finite element model of sandwich structure with negative Poisson’s ratio of periodic rectangular tube quasi-static compression test and low-velocity impact were investigated by the use of ABAQUS/Explicit software. The accuracy of the simulation method was verified by the comparison of test and simulation results. Based on the validated numerical models were further investigated to comprehensively understand the influence of rectangular tube unit cell wall thickness (t) and cell height (h) on the load capacity and energy absorption capacity of the specimen. The energy absorption capacity and mechanical properties of the proposed negative Poisson’s ratio sandwich structure could be enhanced by optimizing the design of rectangular tube unit cell wall thickness (t) and rectangular tube unit cell height (h). The present findings offer insights into the application of negative Poisson’s ratio sandwich structure impact energy-absorbing structures in aerospace, automotive and other fields.","PeriodicalId":17215,"journal":{"name":"Journal of Sandwich Structures & Materials","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2022-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48698041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Characterization and repair of core gap manufacturing defects for wind turbine blades 风电叶片芯隙制造缺陷的表征与修复

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-14 DOI: 10.1177/10996362221122046

Paul Murdy, Scott Hughes, D. Barnes

{"title":"Characterization and repair of core gap manufacturing defects for wind turbine blades","authors":"Paul Murdy, Scott Hughes, D. Barnes","doi":"10.1177/10996362221122046","DOIUrl":"https://doi.org/10.1177/10996362221122046","url":null,"abstract":"Various wind turbine blade components, such as shear webs and skins, commonly use fiber-reinforced composite sandwich structures with a core material like balsa or foam. During manufacturing, core gap defects may result from the misalignment of adjacent foam or balsa core sheets in the blade mold. It is important to understand the influence that core gaps have on the structural integrity of wind turbine blades and how to mitigate their influence. This research characterized the effects of core gap defects at the manufacturing and mechanical levels for both epoxy and next-generation thermoplastic composites. Common repair methods were assessed and compared. Multiple defect sizes were compared using temperature data gathered with thermocouples embedded during manufacturing to core gap defect characteristics obtained using image-mapping techniques, optical microscopy, and mechanical characterization by long beam flexure. Results showed that peak exothermic temperatures during curing were closely related to core gap size. The long beam flexure tests determined that transverse core gaps under pure bending loads can have a substantial effect on the ultimate facesheet strength of both epoxy and thermoplastic composite sandwich structures (up to 25% strength reduction), although the size of the defect itself had less of an influence on the magnitude of the strength reduction. The supporting image-mapping techniques indicated that the distortion of the composite facesheets by the core gaps contributed to the premature failures. The repair methods used in this study did very little to improve the ultimate strength of the sandwich panels that previously had core gap defects. The repair of the thermoplastic panel resulted in a further loss in ultimate facesheet strength. This research demonstrated that there is a vital need for the development of a compatible thermoplastic polymer repair resin system and appropriate resin specific repair procedures for the next generation of recyclable thermoplastic wind blades.","PeriodicalId":17215,"journal":{"name":"Journal of Sandwich Structures & Materials","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2022-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43602745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Development and evaluation of the sandwich open-hole compression test 夹层裸眼压缩试验的开发与评价

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-11 DOI: 10.1177/10996362221115052

M. Stanfield, Bradley Kuramoto, D. Adams

{"title":"Development and evaluation of the sandwich open-hole compression test","authors":"M. Stanfield, Bradley Kuramoto, D. Adams","doi":"10.1177/10996362221115052","DOIUrl":"https://doi.org/10.1177/10996362221115052","url":null,"abstract":"An open-hole compression test method has been developed to assess the notch sensitivity of sandwich composites under compression loading. This test method, in the process of being standardized by ASTM International, utilizes end loading as well as knife-edge side supports to provide out-of-plane restraint to specimen buckling. Finite element analyses focused on identifying a sandwich specimen geometry that minimized finite-width and finite-length effects on the stress concentration produced by the centrally-located through-hole. Geometric variables included the specimen width-to-hole diameter (w/D) and length-to-hole diameter (l/D) ratios. The sandwich configurations investigated consisted of a Nomex honeycomb core and carbon/epoxy facesheet laminates with a range of material orthotropy ratios. Numerical results were used to identify a candidate sandwich specimen geometry and optimal strain gage placements for use in specimen alignment. A series of mechanical tests were performed to evaluate the proposed specimen design, the proposed test fixture, and the recommended test procedure. The first set of experiments were performed using specimens with different hole diameters but the same specimen width and length. A second set of experiments used specimens with different lengths but with the same specimen width and open-hole. In addition, the use of specimen end potting of the core region was investigated to prevent facesheet separation and end brooming.","PeriodicalId":17215,"journal":{"name":"Journal of Sandwich Structures & Materials","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42468242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Erratum to ‘Experimental and numerical investigation on the buckling of 3D printed sandwich structure with lattice core” 3D打印点阵芯夹层结构屈曲的实验与数值研究勘误

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-08 DOI: 10.1177/10996362221118067

引用次数: 0

Characterization of micro-sandwich structures via direct ink writing epoxy based cores 通过直接墨水书写环氧基核心表征微夹层结构

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-06 DOI: 10.1177/10996362221118329

Zane J Smith, Demiana R Barsoum, Zachariah Arwood, D. Penumadu, R. Advíncula

{"title":"Characterization of micro-sandwich structures via direct ink writing epoxy based cores","authors":"Zane J Smith, Demiana R Barsoum, Zachariah Arwood, D. Penumadu, R. Advíncula","doi":"10.1177/10996362221118329","DOIUrl":"https://doi.org/10.1177/10996362221118329","url":null,"abstract":"Sandwich structured (SS) composites demonstrate considerable flexural stiffness and high strength-to-weight ratios and can be tailored as functional materials. Historically they have been constrained to specific material types and geometry due to limitations in manufacturing methods. However, employing additive manufacturing (AM), specifically direct ink writing (DIW), can provide an alternative method for making SS composites with complex and controllable micro and mesostructures with multifunctionality targeted at desired mechanical, thermal, and electrical properties. DIW, an extrusion-based AM technique, uses a viscous and thixotropic ink with desired components that, once printed, is cured to obtain the final complex net shape parts. In this paper, a novel hybrid AM technique is employed to manufacture SS composite materials containing bisphenol A-based epoxy core and carbon fiber reinforced polymer (CFRP) face sheets that are fabricated via DIW and vacuum infusion process (VIP), respectfully. We demonstrate that the fabrication of these SS composites can be tailored from a thermosetting material, from which additives and/or various lattice structures can be manufactured to achieve enhanced and desirable mechanical integrity with functional properties. Surface topology and mechanical testing techniques are used to characterize the fabricated hybrid SS composites to study and assess mechanical stability. A rheo-kinetic cure model was developed for the core material to allow for additive manufacturing process requirements while ensuring complete cross-linking for the thermoset-based core material. Because of the ability to obtain relatively small core-thickness and controlled architecture, this method now allows for fabricating layered micro-sandwich structures for realizing further light-weighting in relevant applications.","PeriodicalId":17215,"journal":{"name":"Journal of Sandwich Structures & Materials","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2022-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47292168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Mode II fracture characterisation of a honeycomb/carbon-epoxy sandwich panel using the asymmetric end-notched flexure test 蜂窝/碳-环氧夹层板II型断裂特征的不对称端缺口弯曲试验

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-08-05 DOI: 10.1177/10996362221118031

R. Moreira, Mfsf de Moura, R. Rocha, C. Oliveira

引用次数: 2

Mechanical response of sisal/glass fabrics reinforced polyester – polyethylene terephthalate foam core sandwich panels 剑麻/玻璃纤维增强聚酯-聚对苯二甲酸乙二醇酯泡沫夹芯板的力学响应

IF 3.9 3区材料科学

Journal of Sandwich Structures & Materials Pub Date : 2022-07-21 DOI: 10.1177/10996362221115057

Eduardo Fischer Kerche, Bruno G Silveira Caldas, R. Carvalho, S. Amico

引用次数: 1