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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721099818
Category :
Languages : en
Pages : 166
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Book Description
This study explored the feasibility and potential benefits provided by the addition of through-the-thickness reinforcement to sandwich structures. Through-the-thickness stitching is proposed to increase the interlaminar strength and damage tolerance of composite sandwich structures. A low-cost, out-of-autoclave processing method was developed to produce composite sandwich panels with carbon fiber face sheets, a closed-cell foam core, and through-the-thickness Kevlar stitching. The sandwich panels were stitched in a dry preform state, vacuum bagged, and infiltrated using Vacuum Assisted Resin Transfer Molding (VARTM) processing. For comparison purposes, unstitched sandwich panels were produced using the same materials and manufacturing methodology. Test panels were produced initially at the University of Utah and later at NASA Langley Research Center. Four types of mechanical tests were performed: flexural testing, flatwise tensile testing, core shear testing, and edgewise compression testing. Drop-weight impact testing followed by specimen sectioning was performed to characterize the damage resistance of stitched sandwich panels. Compression after impact (CAI) testing was performed to evaluate the damage tolerance of the sandwich panels. Results show significant increases in the flexural stiffness and strength, out-of-plane tensile strength, core shear strength, edgewise compression strength, and compression-after-impact strength of stitched sandwich structures. Stanley, Larry E. and Adams, Daniel O. and Reeder, James R. (Technical Monitor) Langley Research Center NASA Order L-11332; RTOP 242-82-76-10
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721099818
Category :
Languages : en
Pages : 166
Get Book Here
Book Description
This study explored the feasibility and potential benefits provided by the addition of through-the-thickness reinforcement to sandwich structures. Through-the-thickness stitching is proposed to increase the interlaminar strength and damage tolerance of composite sandwich structures. A low-cost, out-of-autoclave processing method was developed to produce composite sandwich panels with carbon fiber face sheets, a closed-cell foam core, and through-the-thickness Kevlar stitching. The sandwich panels were stitched in a dry preform state, vacuum bagged, and infiltrated using Vacuum Assisted Resin Transfer Molding (VARTM) processing. For comparison purposes, unstitched sandwich panels were produced using the same materials and manufacturing methodology. Test panels were produced initially at the University of Utah and later at NASA Langley Research Center. Four types of mechanical tests were performed: flexural testing, flatwise tensile testing, core shear testing, and edgewise compression testing. Drop-weight impact testing followed by specimen sectioning was performed to characterize the damage resistance of stitched sandwich panels. Compression after impact (CAI) testing was performed to evaluate the damage tolerance of the sandwich panels. Results show significant increases in the flexural stiffness and strength, out-of-plane tensile strength, core shear strength, edgewise compression strength, and compression-after-impact strength of stitched sandwich structures. Stanley, Larry E. and Adams, Daniel O. and Reeder, James R. (Technical Monitor) Langley Research Center NASA Order L-11332; RTOP 242-82-76-10
Author: Larry E. Stanley
Publisher:
ISBN:
Category : Composite construction
Languages : en
Pages : 172
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Book Description
Author: O.T. Thomsen
Publisher: Springer Science & Business Media
ISBN: 9781402034442
Category : Technology & Engineering
Languages : en
Pages : 1064
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Book Description
Sandwich structures represent a special form of a laminated composite material or structural elements, where a relatively thick, lightweight and compliant core material separates thin stiff and strong face sheets. The faces are usually made of laminated polymeric based composite materials, and typically, the core can be a honeycomb type material, a polymeric foam or balsa wood. The faces and the core are joined by adhesive bonding, which ensures the load transfer between the sandwich constituent parts. The result is a special laminate with very high bending stiffness and strength to weight ratios. Sandwich structures are being used successfully for a variety of applications such as spacecraft, aircraft, train and car structures, wind turbine blades, boat/ship superstructures, boat/ship hulls and many others. The overall objective of the 7th International Conference on Sandwich Structures (ICSS-7) is to provide a forum for the presentation and discussion of the latest research and technology on all aspects of sandwich structures and materials, spanning the entire spectrum of research to applications in all the fields listed above.
Author: Mohamed Adli Dimassi
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832550100
Category : Science
Languages : en
Pages : 165
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Book Description
The rising demand to reduce fuel consumption and the continuous increase of materials and manufacturing costs has obliged aircraft manufacturers to boost the use of composite materials and to optimise the manufacturing methods. Foam core sandwich structures combine the advantages of high bending properties with low manufacturing costs when liquid composite processes are used. However, the use of foam core sandwich structures is not widespread in aircraft applications due to the better weight-specific performance of honeycomb cores and the susceptibility to impact loading. In this context, pin reinforcements are added to the foam core to improve its mechanical properties and its damage tolerance. This work contributes to the understanding of the mechanical behaviour of pin-reinforced foam core sandwich structures under static and impact loading. Ultrasonic scan and micro-computed tomography are used to identify the different damage modes. The effect of very low temperature on the damage behaviour under impact loading is investigated. An explicit simulation model to predict the impact response of pin-reinforced foam core sandwich structures is also proposed.
Author: Steve Loud
Publisher: Taylor & Francis
ISBN: 0938994867
Category : Technology & Engineering
Languages : en
Pages : 2381
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Book Description
Author: T. Hikmet Karakoc
Publisher: Springer Nature
ISBN: 3031384466
Category : Technology & Engineering
Languages : en
Pages : 534
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Book Description
The International Symposium on Aircraft Technology, MRO, and Operations (ISATECH) is a multi-disciplinary symposium that presents research on current issues in the field of aerospace. The conference provides a platform offering insights on the latest trends in aircraft technology, maintenance, repair, overhaul, and operations that offer innovative solutions to the challenges facing the aviation industry. ISATECH allows researchers, scientists, engineers, practitioners, policymakers, and students to exchange information, present new technologies and developments, and discuss future direction, strategies and priorities.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 618
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Book Description
Author: Mostafa Mohammadabadi
Publisher:
ISBN:
Category : Engineered wood
Languages : en
Pages : 264
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Book Description
To provide shelter as a basic need for growing world population (expected to reach 8.6 billion in 2030 and 9.8 billion in 2050), it is necessary to efficiently use natural resources to develop effective building products. This research develops a value-added product from small diameter timber as a promising and innovative building material with greater structural and energy performance than comparable building construction materials. Due to high stiffness/strength-to-weight ratio, sandwich structures are widely used in many areas. Those with hollow cores have attracted interest because the cavities can be used to improve the thermal and acoustic performance. In this study, a novel sandwich structure with 3-D core(s) was developed for constructing building envelopes. Using FE model and a mechanics-based approach, a parametric study was conducted to design a biaxial corrugated geometry to serve as a core for the sandwich structure. After verifying the design, a large mold was fabricated to produce biaxial corrugated panels which were then used to fabricate 1- and 2-layered corrugated core sandwich panels. These panels were evaluated for their bending, axial compression, and thermal conductivity properties. Analytical models using high-order sandwich panel theory for beam configuration and classical plate theory along with third order shear deformation plate theory for full size sandwich panels were developed to capture their bending behavior within the elastic region. Hashin damage model implemented in Abaqus finite element software was used to capture load-carrying capacity of the sandwich panels. Since wood and wood-based products are viscoelastic, creep tests were conducted to understand the time-dependent behavior of the sandwich structure.Experimental results showed significantly higher performance for 2-layered corrugated core sandwich panels than SIPs and stud-walls under bending and axial compression loads. Normalized R-value of the panels filled with closed-cell foam was twice that of typical wood composite panels. Predictions of the bending stiffness and the load carrying capacity of 1-layered corrugated core sandwich panels using analytical and damage models agreed very closely with the experimental results (a difference of less than 1%). Wood strand sandwich panels developed in this study provide an opportunity to prefabricate panels for construction of residential building envelopes.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1482
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Book Description
