Analysis of the mechanical response of impact loaded composite sandwich structures with focus on foam core shear failure

Analysis of the mechanical response of impact loaded composite sandwich structures with focus on foam core shear failure
Author :
Publisher : Logos Verlag Berlin GmbH
Total Pages : 238
Release :
ISBN-10 : 9783832538538
ISBN-13 : 3832538534
Rating : 4/5 (38 Downloads)

Synopsis Analysis of the mechanical response of impact loaded composite sandwich structures with focus on foam core shear failure by : Tim Berend Block

Sandwich structures are an economically and structurally efficient way of designing large integral composite parts. In the aerospace industry pre-impregnated face sheets and honeycomb core structures can be considered as industry standard while e.g. naval structures and wind turbine blades typically use vacuum infusion technology with polymer foam cores. Application of the less costly infusion technology in the aeronautical industry requires a thorough understanding of the damage tolerance including low velocity impact as a frequent source of damaging events. At low impact energies damage in composite foam core sandwich structures is limited to core crushing and local face sheet delaminations. Higher impact energies may initiate the competing failure modes face sheet rupture and core shear failure depending on impact, geometric and material parameters. Face sheet rupture leads to severe local damage with typically good visibility, while core shear failure leads to cracks and rear face sheet debonding of the foam core with less visibility. This work investigates the low velocity impact response of sandwich structures with carbon fiber reinforced plastic (CFRP) face sheets and a polymeric foam core using experiments at room temperature and at -55° Celsius. An analytically derived failure mode map is presented as a simple tool for design guidelines while the explicit finite element method is applied for a more detailed description of the sandwich impact process. Both models are used to analyze the impact response and describe relevant sensitivity parameters of sandwich structures.

Analysis of the mechanical performance of pin-reinforced sandwich structures

Analysis of the mechanical performance of pin-reinforced sandwich structures
Author :
Publisher : Logos Verlag Berlin GmbH
Total Pages : 165
Release :
ISBN-10 : 9783832550103
ISBN-13 : 3832550100
Rating : 4/5 (03 Downloads)

Synopsis Analysis of the mechanical performance of pin-reinforced sandwich structures by : Mohamed Adli Dimassi

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.

Woven Fabric Composites

Woven Fabric Composites
Author :
Publisher : CRC Press
Total Pages : 208
Release :
ISBN-10 : 0877629900
ISBN-13 : 9780877629900
Rating : 4/5 (00 Downloads)

Synopsis Woven Fabric Composites by : Niranjan K. Naik

This work is presented as an analytical methodology developed to study the thermo-elastic behavior of woven fabric composites. Also, experimental studies on the failure behavior of woven fabric composites are presented.

Blast and Ballistic Loading of Structures

Blast and Ballistic Loading of Structures
Author :
Publisher : CRC Press
Total Pages : 333
Release :
ISBN-10 : 9781482269277
ISBN-13 : 1482269279
Rating : 4/5 (77 Downloads)

Synopsis Blast and Ballistic Loading of Structures by : John Hetherington

This book brings together, in a concise format, the key elements of the loads produced from explosive sources, and how they interact with structures. Explosive sources include gas, high explosives, dust and nuclear materials.It presents quantitative information and design methods in a useable form without recourse to extensive mathematical ana

Structural and Failure Mechanics of Sandwich Composites

Structural and Failure Mechanics of Sandwich Composites
Author :
Publisher : Springer Science & Business Media
Total Pages : 392
Release :
ISBN-10 : 9781402032257
ISBN-13 : 1402032250
Rating : 4/5 (57 Downloads)

Synopsis Structural and Failure Mechanics of Sandwich Composites by : L.A. Carlsson

"Structural and Failure Mechanics of Sandwich Composites" by Leif A. Carlsson and George A. Kardomateas focuses on some important deformation and failure modes of sandwich panels such as global buckling, wrinkling and local instabilities, and face/core debonding. The book also provides the mechanics background necessary for understanding deformation and failure mechanisms in sandwich panels and the response of sandwich structural parts to a variety of loadings. Specifically, first-order and high-order sandwich panel theories, and three-dimensional elasticity solutions for the structural behavior outlined in some detail. Elasticity analysis can serve as a benchmark for judging the accuracy of simplified sandwich plate, shell and beam theories. Furthermore, the book reviews test methods developed for the characterization of the constituent face and core materials, and sandwich beams and plates. The characterization of face/core debonding is a major topic of this text, and analysis methods based on fracture mechanics are described and applied to several contemporary test specimens. Test methods and results documented in the literature are included and discussed. The book will benefit structural and materials engineers and researchers with the desire to learn more about structural behavior, failure mechanisms, fracture mechanics and damage tolerance of sandwich structures.

An Introduction to Sandwich Construction

An Introduction to Sandwich Construction
Author :
Publisher : Twayne Publishers
Total Pages : 277
Release :
ISBN-10 : 0947817778
ISBN-13 : 9780947817770
Rating : 4/5 (78 Downloads)

Synopsis An Introduction to Sandwich Construction by : Dan Zenkert

A rapid virtual autoclave for carbon fiber reinforced plastics

A rapid virtual autoclave for carbon fiber reinforced plastics
Author :
Publisher : Logos Verlag Berlin GmbH
Total Pages : 174
Release :
ISBN-10 : 9783832556129
ISBN-13 : 3832556125
Rating : 4/5 (29 Downloads)

Synopsis A rapid virtual autoclave for carbon fiber reinforced plastics by : Junhong Zhu

Structural carbon fiber reinforced plastic parts are usually manufactured through autoclave processing for high-performance aerospace applications. Today’s aerospace composite manufacturing techniques require high quality with robust manufacturing processes. Manufacturing process simulation enables the investigations of physical effects and manufacturing process mechanisms. This approach has been increasingly used to predict and optimize the manufacturing process for high part quality at low manufacturing costs. Owing to a complicated manufacturing environment involving multi-physics characteristics, there is a critical need to develop an efficient and cost-effective numerical methodology with a systematic study. This thesis contributes to the systematic investigations of the process modeling, simulation, thermal measurement, and optimization in composite manufacturing of autoclave processing. The method provides a correct and efficient thermal analysis and optimization in autoclave processing to achieve better process control and ensure the quality of composite parts. The presented framework can be applied directly in autoclave production with larger dimensions and full-scale tools for aerospace structures. The developed methodology allows quick delivery guidelines of production plans and optimization strategies for composite manufacturing in a highly useful and cost-effective way, thereby reducing the cost in the design and manufacturing phase. Since July 2017, Mr. Junhong Zhu has been working as a research assistant in the department of modeling and simulation at the FIBRE (Faserinstitut Bremen e.V.) at the University of Bremen. He deals with the process modeling and simulation in composite manufacturing of autoclave processing. His research focuses on numerical methods, such as computational fluid dynamics and finite element methods, muti-physics coupling schemes, and process optimization. He is also interested in the use of artificial intelligence in the manufacturing process.

Sandwich Structures 7: Advancing with Sandwich Structures and Materials

Sandwich Structures 7: Advancing with Sandwich Structures and Materials
Author :
Publisher : Springer Science & Business Media
Total Pages : 1029
Release :
ISBN-10 : 9781402038488
ISBN-13 : 1402038488
Rating : 4/5 (88 Downloads)

Synopsis Sandwich Structures 7: Advancing with Sandwich Structures and Materials by : O.T. Thomsen

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.

Dynamic Failure of Composite and Sandwich Structures

Dynamic Failure of Composite and Sandwich Structures
Author :
Publisher : Springer Science & Business Media
Total Pages : 646
Release :
ISBN-10 : 9789400753297
ISBN-13 : 9400753292
Rating : 4/5 (97 Downloads)

Synopsis Dynamic Failure of Composite and Sandwich Structures by : Serge Abrate

This book presents a broad view of the current state of the art regarding the dynamic response of composite and sandwich structures subjected to impacts and explosions. Each chapter combines a thorough assessment of the literature with original contributions made by the authors. The first section deals with fluid-structure interactions in marine structures. The first chapter focuses on hull slamming and particularly cases in which the deformation of the structure affects the motion of the fluid during the water entry of flexible hulls. Chapter 2 presents an extensive series of tests underwater and in the air to determine the effects of explosions on composite and sandwich structures. Full-scale structures were subjected to significant explosive charges, and such results are extremely rare in the open literature. Chapter 3 describes a simple geometrical theory of diffraction for describing the interaction of an underwater blast wave with submerged structures. The second section addresses the problem of impact on laminated composite structures with chapters devoted to ballistic impacts on pre-stressed composite structures, tests developed to simulate dynamic failure in marine structures, damage mechanisms and energy absorption in low velocity impacts, perforation, the numerical simulation of intra and inter-ply damage during impact, and hail impact on laminated composites. Sandwich structures with laminated facings are considered in Section 3 with chapters dealing with the discrete modeling of honeycomb core during the indentation of sandwich structures, the behavior of fold core sandwich structures during impact, and impact on helicopter blades. The fourth section consists of two chapters presenting experimental results and numerical simulation of composite structures subjected to crash. This volume is intended for advanced undergraduate and graduate students, researchers, and engineers interested and involved in analysis and design of composite structures.

Steel and Composite Structures

Steel and Composite Structures
Author :
Publisher : Routledge
Total Pages : 1665
Release :
ISBN-10 : 9781351413923
ISBN-13 : 1351413929
Rating : 4/5 (23 Downloads)

Synopsis Steel and Composite Structures by : Y. C. Wang

Over 150 papers representing the most recent international research findings on steel and composite structures. Including steel constructions; buckling and stability; codes; composite; control; fatigue and fracture; fire; impact; joints; maintenance; plates and shells; retrofitting; seismic; space structures; steel; structural analysis; structural components and assemblies; thin-walled structures; vibrations, and wind. A special session is dedicated on codification. A valuable source of information to researchers and practitioners in the field of steel and composite structures.