2 edition of Improving the fatigue resistance of adhesive joints in laminated wood structures found in the catalog.
Improving the fatigue resistance of adhesive joints in laminated wood structures
by U.S. Dept. of Energy, Conservation and Renewable Energy, Wind/Ocean Technology Division, For sale by the National Technical Information Service in Washington, D.C, [Springfield, Va
Written in English
|Statement||Theodore L. Laufenberg ... [et al.].|
|Series||NASA contractor report -- NASA CR-182165.|
|Contributions||Laufenberg, Theodore., Lewis Research Center., United States. Dept. of Energy. Wind/Ocean Technologies Division.|
|The Physical Object|
|Pagination||1 v. (various pagings)|
of adhesive bonding is manifest in its high fatigue resistance and high strength-to-weight ratio. Since an adhesively bonded joint consists of different materials, its structural analysis is complicated and requires many special considerations and assumptions. For instance, when ad-File Size: 1MB. 2 Introduction • D.M. Hoyt, NSE Composites – NSE since , Boeing before – US Army/Bell Helicopter – Boeing CAI, AIM-C program, and 7E7 – Wind industry - blade root joints – Actively working to implement fracture technologies, quasi-static and fatigue growth • Steve Ward, SW Composites – SWC since – Boeing , Composites Methods and Allowables group.
The book provides engineers and scientists with the technical know-how to simulate a variety of adhesively bonded joints using ANSYS. It explains how to model stress, fracture, fatigue crack propagation, thermal, diffusion and coupled field analysis of the following: single lap, double lap, lap strap/cracked lap shear, butt and cantilevered. delicate surfaces, reduced resistance to peeling efforts, etc.). Thus, numerous research projects have been carried out in order to establish the analytical models of the structural adhesive joints to allow learning more on the performance of the adhesives and to provide criteria to optimise the design of the adhesive joints [8,9[.
stresses cause deformations and cracking in the wood. Cyclic climatic changes decrease the strength of the wood. After 25 full pe-riods of change, this weakening can be confirmed through measuring, therefore cyclic climatic changes have the fatigue effect. (A full period is when the moisture content of wood changes from 30% to 0% and back. Fatigue and Fracture of Fibre Metal Laminates (Solid Mechanics and Its Applications) [René Alderliesten] on *FREE* shipping on qualifying offers. This book contributes to the field of hybrid technology, describing the current state of knowledge concerning the hybrid material concept of laminated metallic and composite sheets for primary aeronautical .
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Improving the Fatigue Resistance of Adhesive Joints in Laminated Wood Structures Theodore L. Laufenberg, Bryan H. River, Lidija L. Murmanis, and Alfred W. Christiansen USDA Forest Service Forest Products Laboratory Madison, Wisconsin August Prepared for National Aeronautics and Space Administration Lewis Research Center.
Get this from a library. Improving the fatigue resistance of adhesive joints in laminated wood structures. [Theodore Laufenberg; Lewis Research Center.; United States. Department of Energy. Wind/Ocean Technologies Division.;].
Improving the fatigue resistance of adhesive joints in laminated wood structures Technical Report Laufenberg, T L ; River, B H ; Murmanis, L L ; The premature fatigue failure of a laminated wood/epoxy test beam containing a cross-section finger joint was the subject of a multidisciplinary investigation to assess and advance the technology.
Improving the fatigue resistance of adhesive joints in laminated wood structures. Technical Report The premature fatigue failure of a laminated wood/epoxy test beam containing a cross-section finger joint was the subject of a multidisciplinary investigation to assess and advance the technology of adhesive joints in composite wood structures.
Measurements of the in-situ resistance of the DCB joint, as shown in Fig. 1a, as a function of crack length were conducted during the cyclic fatigue tests.
These specimens had an initial crack length, a o, of 50 length of the DCB specimen was shortened to mm and the adhesive layer length, l b was equal to 50 mm. The ‘Teflon insert’ film, which acted as the Cited by: This paper presents a literature review on fatigue in adhesively bonded joints and covers articles published in the Web of Science from until About cited articles are presented and reviewed.
The paper is divided into several related topics such as fatigue strength and lifetime analysis, fatigue crack initiation, fatigue crack propagation, fatigue durability, variable fatigue Cited by: Vary the number of specimens taken from each member and the number of members selected for test depending on the total number of members involved and the purpose of the tests.
It is advisable, however, to include at least three specimens in the test, with the specimens selected to represent the probable range of quality of the adhesive joints. The Fatigue Resistance of the Fiber-Metal Laminates Arall and Glarex metal sheets and fibre/adhesive layers. This laminated structure provides Author: Jaap Schijve.
This paper discusses the static and fatigue behavior of adhesively bonded single lap joints in SMC-SMC composites. Effects of lap length and adhesive thickness on the static and fatigue strength of SMC-SMC adhesive joints are studied.
Effects of SMC surface preparation and test speed on the joint performance are evaluated. Bainbridge and Mettem () categorised the large finger joints as adhesive bonded surface contact joints.
These large finger joints are suitable as moment-resisting connection in timber structures and are commonly used at portal haunches. They also reviewed the advantages and disadvantages of using adhesives in timber by: 2.
This book contains the contributions from the RILEM International Symposium on Materials and Joints in Timber Structures that was held in Stuttgart, Germany from October 8 to 10, It covers recent developments in the materials and the joints used in modern timber structures.
Regarding basic wooden materials, the contributions highlight the widened spectrum of. American Institute of Timber Construction South Revere Parkway, SuiteCentennial, CO • AITC STANDARD SPECIFICATIONS FORFile Size: KB.
an adequate measure of integrity of adhesive joints under severe service conditions, a test that simulates the effects of exterior exposure has been devised to evaluate adhesive joints in structural laminated wood members intended for this type of service. Scope These test methods cover an accelerated means of.
In this paper we test the hypothesis that adhesive through-reinforcement in combination with glass-fibre reinforcement of adhesive bond lines will significantly improve the fracture toughness of a laminated birch wood composite.
We test this hypothesis using a model composite consisting of perforated veneer that allowed a polyurethane adhesive to penetrate and reinforce veneers Author: Wenchang He, Philip D. Evans. Structural glued laminated timber (glulam) is an engineered, stress-rated product that consists of two or more layers of lumber (i.e., laminations) glued together with the grain running lengthwise.
When evaluated after a water soaking, water soaking and drying, or boiling and drying, the percentage of estimated wood failure is an important criterion for qualifying adhesives for use in plywood, laminated structural timber, adhesively bonded wood products and for daily quality control of the processes for manufacturing various adhesively bonded wood products including.
Advantages of glued laminated wood construction are many and significant. They, include, the following: (a)Ease of fabricating large structural elements from standard sizes of lutbers Laminated arches have already been erected that provide buildings with clear spans up to feet, and, also, laminated beams of foot span.
Engineered wood, also called mass timber, composite wood, man-made wood, or manufactured board, includes a range of derivative wood products which are manufactured by binding or fixing the strands, particles, fibres, or veneers or boards of wood, together with adhesives, or other methods of fixation to form composite panels vary in size but can range upwards.
regions of high stress gradients be equal to one third of the adhesive thickness . Maximum Strain Criterion: According to Hart-Smith , maximum lap-joint strength is defined by the adhesive strain energy in shear (i.e. stress level for joint failure is mainly dependent on the shear strain to failure of the adhesive).File Size: KB.
mechanism in adhesive bonding to wood. For two wood adherends to be held together with maximum strength, a liquid adhesive must wet and spread freely to make intimate contact with both surfaces. Molecules of the adhesive must diffuse over and into each surface to make contact with the molecular structure of wood so that.
fracture and fatigue of wood may be found in . Clearly, in order to extend the use of timber road bridges to larger spans more data on fatigue of dowel joints in timber structures are needed. The present design rules are very limited and most likely insufficient or non-documented. Furthermore,File Size: KB.RESISTANCE OF SEVERAL TYPES OF GLUE IN WOOD JOINTS TO FATIGUE STRESSING-By W.
Z. OLSON, Technologist, D. W. BENSEND, Technologist, and H. D. BRUCE, Chemist Forest Products Laboratoryr2– Forest Service U. S. Department of Agriculture MI AN. •nn Introduction Glued joints in wood aircraft structures are subjected to repeated stressing.EA – Modified epoxy film adhesive designed for structural bonds requiring toughness, as applied in composite, metal, and honeycomb bonding.
EA – Bonding film adhesive with excellent environmental resistance used in composites structural repair, cure and cocure with composite laminates, and metal and honeycomb Size: 1MB.