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Effect of Moisture on Fracture Toughness of Composite/Wood Bonded Interfaces

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Release : 2000
Genre : Bonded interface
Kind : eBook
Book Rating : /5 ( reviews)

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Book Synopsis Effect of Moisture on Fracture Toughness of Composite/Wood Bonded Interfaces by : BS. Trimble

Download or read book Effect of Moisture on Fracture Toughness of Composite/Wood Bonded Interfaces written by BS. Trimble. This book was released on 2000. Available in PDF, EPUB and Kindle. Book excerpt: Current research on wood reinforcement has focused on the use of fiber-reinforced plastic (FRP) strips or fabrics bonded to wood members. Although significant increases in stiffness and strength have been achieved by this reinforcing technique, there is a concern about the reliable performance of the wood-FRP interface bond, which can be susceptible to delamination. The objective of this study is to present a combined analytical/experimental study to evaluate the effect of moisture on fracture toughness of composite/wood bonded interfaces under Mode I loading. A contoured double cantilever beam (CDCB) specimen is used to characterize the fracture toughness of both wood-wood and wood-FRP samples. The specimens are designed by the Rayleigh Ritz method to achieve a linear rate of compliance with respect to crack length and are calibrated experimentally and also analytically by the finite element method. Both wood-wood and wood-FRP samples are tested under dry and wet conditions, and bonded interface fracture toughness data under Mode I loading are obtained. The guidelines and procedures for the modeling and design of CDCB specimens for hybrid or dissimilar adherends using a Rayleigh-Ritz model are presented briefly, and a modified Rayleigh-Ritz method is further developed. The effect of moisture on fracture toughness is evaluated, and increases in interface fracture toughness are observed due to moisture absorption for wet wood-wood and wood-FRP samples; the toughening of the interface under moisture is due mainly to a much more plastic fracture failure mode of the interface.

Fatique and Fracture Mechanics

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Release : 2000
Genre : Fatigue
Kind : eBook
Book Rating : 681/5 ( reviews)

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Book Synopsis Fatique and Fracture Mechanics by : Gary R. Halford

Download or read book Fatique and Fracture Mechanics written by Gary R. Halford. This book was released on 2000. Available in PDF, EPUB and Kindle. Book excerpt:

Proceedings of the American Society for Composites, Seventeenth Technical Conference

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Release : 2002-10-24
Genre : Technology & Engineering
Kind : eBook
Book Rating : 018/5 ( reviews)

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Book Synopsis Proceedings of the American Society for Composites, Seventeenth Technical Conference by : C. T. Sun

Download or read book Proceedings of the American Society for Composites, Seventeenth Technical Conference written by C. T. Sun. This book was released on 2002-10-24. Available in PDF, EPUB and Kindle. Book excerpt:

Long Term Durability of Structural Materials

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Release : 2001-08-29
Genre : Technology & Engineering
Kind : eBook
Book Rating : 593/5 ( reviews)

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Book Synopsis Long Term Durability of Structural Materials by : P.J.M. Monteiro

Download or read book Long Term Durability of Structural Materials written by P.J.M. Monteiro. This book was released on 2001-08-29. Available in PDF, EPUB and Kindle. Book excerpt: "Long Term Durability of Structural Materials" features proceedings of the workshop held at Berkeley, CA in October, 2000. It brought together engineers and scientists, who have received grants from the initiative NSF 98-42, to share their results on the study of long-term durability of materials and structures. The major objective was to develop new methods for accelerated short-term laboratory or in-situ tests which allow accurate, reliable, predictions of the long-term performance of materials, machines and structures. To achieve this goal it was important to understand the fundamental nature of the deterioration and damage processes in materials and to develop innovative ways to model the behavior of these processes as they affect the life and long-term performance of components, machines and structures. The researchers discussed their approach to include size effects in scaling up from laboratory specimens to actual structures. Accelerated testing and durability modeling techniques developed were validated by comparing their results with performance under actual operating conditions. The main mechanism of the deterioration discussed included environmental effects and/or exposure to loads, speeds and other operating conditions that are not fully anticipated in the original design. A broad range of deterioration damage, such as fatigue, overload, ultraviolet damage, corrosion, and wear was presented. A broad range of materials of interest was also discussed, including the full spectrum of construction materials, metals, ceramics, polymers, composites, and coatings. Emphasis was placed on scale-dependence and history of fabrication on resulting mechanical behavior of materials.

Fiber-Reinforced Composite and Wood Bonded Interfaces

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Author :
Release : 2006
Genre : Composite materials
Kind : eBook
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Book Synopsis Fiber-Reinforced Composite and Wood Bonded Interfaces by : JF. Davalos

Download or read book Fiber-Reinforced Composite and Wood Bonded Interfaces written by JF. Davalos. This book was released on 2006. Available in PDF, EPUB and Kindle. Book excerpt: The evaluation of durability and shear strength of FRP-wood bonded interfaces is presented in Part 1 of this two-part study (see Davalos et al. [1]); here, in Part 2, an innovative contoured double-cantilever beam (CDCB) specimen is used to evaluate Mode I fracture of bonded interfaces, and interface fracture toughness data are experimentally obtained for dry and wet conditions. The specimens are designed by the Rayleigh-Ritz method to achieve a linear rate of compliance with respect to crack length. The proposed CDCB specimen is an efficient tool to evaluate Mode I fracture of hybrid interfaces, and the fracture toughness data obtained can be used to predict whether or not a bonded interface will delaminate under general service conditions. Based on the results of this two-part study, recommendations and guidelines are given for evaluation and qualification of FRP-wood bonded interfaces; the methods presented are useful for designing bonded joints, evaluating in-service durability of interfaces, and obtaining fracture toughness data for FRP-wood material combinations.

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