Analysis of Low Velocity Impact on Pultruded Fiber Reinforced Polymer Plates PDF Download

Author: David Richard Motley
Publisher:
ISBN:
Category :
Languages : en
Pages : 93

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Keywords: FEA, fiber reinforced composites, low velocity impact.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Impact is one of the greatest design limitations involved in designing new composite products. The purpose of this research was to gain an initial understanding of the impact behavior of fiberglass reinforced pultruded laminates with vinylester and isopolyester resins. The effect of adding a protective layer of rubber to the laminates was also investigated. Several drop tower impact test were performed with a relatively high mass (12 lbs.) and a low velocity (80-150 in/s). These impacts produced severe damage in some of the laminates with only one impact. The 3D stitched laminates and the DuraspanTM laminates, which are used in Martin Marietta Composite's bridge decks, showed the least amount of visible damage of the laminates tested. The DuraspanTM laminates however, had two interlaminar delamination regions while the others only had one. This delamination was seen with C-san images of the impacted laminates. This extra delamination region did not decrease the tensile strength at all. Tensile tests were performed with a 1 in. strip from the center of the impacted samples in order to test the residual tensile strength. Finite element models were created with ANSYS/ls-Dyna nonlinear finite element software. These models were used to simulate the drop tower tests and then were extended to thicker laminates as well as different impact speed and impactor mass. Several models were also created to predict the effects of the rubber protective layer. These models were able to predict approximate stresses and strains induced in the laminates during the impact which were compared to the damage from the drop tower tests. The models predicted that the rubber layer decreased the stress and strain in the laminate up to 50%. The drop tower tests confirmed that the rubber aided the impact resistance significantly.

Author: Kalyan Kumar Singh
Publisher: Springer Nature
ISBN: 9811694397
Category : Technology & Engineering
Languages : en
Pages : 311

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^ p="" This highly informative and carefully presented volume highlights the impact behavior of fibre reinforced polymer composites. It begins with a preliminary focus on FRP materials, fabrication processes, micro- and macro- mechanics to calculate FRP laminates properties, damage nodes associated with FRP composites under different loadings. It provides a simple and unified approach to cover aspects of FRP composites behavior with low velocity impact loading. This book offers a valuable guide for those who wish to develop deeper insights into weaving architectures, stacking sequences, fabrication processes, general damage modes associated with FRP composites. It is a useful volume for students, academia and industry alike. ^

Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722146085
Category :
Languages : en
Pages : 24

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A model is presented for estimating the dimensions of delaminations in continuous fiber reinforced composite plates subjected to non-penetrating (low velocity) impact of a solid object. The model is based on dimensional analysis, and results in two simple, closed form expressions, one providing the delamination length, the other the delamination width. Comparisons of delamination lengths and widths calculated by these expressions with experimental data suggest that the model predicts these dimensions with reasonable accuracy. Finn, Scott R. and Springer, George S. Unspecified Center NCA2-311...

Author: Daihua Zheng
Publisher:
ISBN:
Category : Aerospace engineering
Languages : en
Pages : 143

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"In the past few decades polymer composites have been utilized more in structures where high strength and light weight are major concerns, e.g., aircraft, high-speed boats and sports supplies. It is well known that they are susceptible to damage resulting from lateral impact by foreign objects, such as dropped tools, hail and debris thrown up from the runway. The impact response of the structures depends not only on the material properties but also on the dynamic behavior of the impacted structure. Although commercial software is capable of analyzing such impact processes, it often requires extensive expertise and rigorous training for design and analysis. Analytical models are useful as they allow parametric studies and provide a foundation for validating the numerical results from large-scale commercial software. Therefore, it is necessary to develop analytical or semi-analytical models to better understand the behaviors of composite structures under impact and their associated failure process. In this study, several analytical models are proposed in order to analyze the impact response of composite laminated plates. Based on Meyer's Power Law, a semi-analytical model is obtained for small mass impact response of infinite composite laminates by the method of asymptotic expansion. The original nonlinear second-order ordinary differential equation is transformed into two linear ordinary differential equations. This is achieved by neglected high-order terms in the asymptotic expansion. As a result, the semi-analytical solution of the overall impact response can be applied to contact laws with varying coefficients. Then an analytical model accounting for permanent deformation based on an elasto-plastic contact law is proposed to obtain the closed-form solutions of the wave-controlled impact responses of composite laminates. The analytical model is also used to predict the threshold velocity for delamination onset by combining with an existing quasi-static delamination criterion. The predictions are compared with experimental data and explicit finite element LS-DYNA simulation. The comparisons show reasonable agreement. Furthermore, an analytical model is developed to evaluate the combined effects of prestresses and permanent deformation based on the linearized elasto-plastic contact law and the Laplace Transform technique. It is demonstrated that prestresses do not have noticeable effects on the time history of contact force and strains, but they have significant consequences on the plate central displacement. For a impacted composite laminate with the presence of prestresses, the contact force increases with the increasing of the mass of impactor, thickness and interlaminar shear strength of the laminate. The combined analytical and numerical investigations provide validated models for elastic and elasto-plastic impact analysis of composite structures and shed light on the design of impact-resistant composite systems."--Abstract.

Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1052

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Author: K. N. Shivakumar
Publisher:
ISBN:
Category :
Languages : en
Pages : 36

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Author: Shailendra Kumar
Publisher: Springer Nature
ISBN: 9811699526
Category : Technology & Engineering
Languages : en
Pages : 830

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Book Description
This book presents the selected proceedings of 2nd International Conference on Recent Advances in Manufacturing (RAM 2021). The book provides insights to current research trends and opportunities in modelling and optimization of manufacturing processes and systems. The topics covered include modelling analysis, computing and simulation, traditional and non-traditional optimization techniques, surface coating methods, additive manufacturing processes, CAD/CAM, robotics and automation, welding and joining processes, supply chain management and CAE and reverse engineering. This book will be a good reference for beginners, researchers and professionals interested in modelling and optimization related to manufacturing engineering and related fields.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 974

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Author: Antonio J.M. Ferreira
Publisher: Società Editrice Esculapio
ISBN: 8874889771
Category : Technology & Engineering
Languages : en
Pages : 212

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Book Description
Nowadays, it is quite easy to see various applications of fibrous composites, functionally graded materials, laminated composite, nano-structured reinforcement, morphing composites, in many engineering fields, such as aerospace, mechanical, naval and civil engineering. The increase in the use of composite structures in different engineering practices justify the present international meeting where researches from every part of the globe can share and discuss the recent advancements regarding the use of standard structural components within advanced applications such as buckling, vibrations, repair, reinforcements, concrete, composite laminated materials and more recent metamaterials. For this reason, the establishment of this 19th edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Porto (Portugal), selected plenary and keynote lectures have been collected in the present book.