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Wednesday, April 29, 2020 | History

2 edition of effect of carriers on the environmental stability of adhesive joints found in the catalog.

effect of carriers on the environmental stability of adhesive joints

Anne Catherine Moloney

effect of carriers on the environmental stability of adhesive joints

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Published by Leicester Polytechnic in Leicester .
Written in English


Edition Notes

Thesis (Ph.D.) - Leicester Polytechnic, Leicester 1979.

StatementAnne Catherine Moloney.
ContributionsLeicester Polytechnic. School of Chemistry.
ID Numbers
Open LibraryOL17861770M

This book describes finite element modelling of adhesive joints with composite and metal adherends. The contents are organized in 9 chapters from fundamentals to advanced modelling techniques. Classical solid elements, fracture mechanics elements and cohesive elements are Author: Magd Abdel Wahab. metal substrate, a riveted joint and an adhesive joint is shown. The fa-tigue resistance of the adhesive joint is far better than that of the riveted joint and close to that of the metal substrate. The modes of failure in an adhesively bonded joint can be cohesive, adhesive or a combination of cohesive/adhesive failures as shown in Figure File Size: 1MB. Reference: Abbott, Richard. Analysis and Design of Composite and Metallic Flight Vehicle Structures 3 Edition, Interaction of Shear and Tension for Bolts Traditional analysis methods only cover the interaction effects of shear on the shank of the fastener and tension alone on the threaded portion. The most recent and best reference for this [ ]. Note 2: Crack growth in adhesive bond specimens can proceed in two ways: (1) by a slow-stable extension where the crack velocity is dictated by the crosshead rate or (2) by a run-arrest extension where the stationary crack abruptly jumps ahead outrunning the crosshead-predicted first type of crack extension is denoted flat; the second type peaked because of the .

This practice covers the procedure for the direct exposure of adhesive bonded joints and structures to natural atmospheric environments. The procedure for sheltered atmospheric exposure, such as a Stevenson screen (1), 2 of adhesive-bonded joints and specimens is the same except for the requirements of facing south and measurement of.


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effect of carriers on the environmental stability of adhesive joints by Anne Catherine Moloney Download PDF EPUB FB2

The exact cause of premature adhesive failure is very difficult to determine. If the adhesive does not wet the surface of the substrate completely, the bond strength is certain to be less than maximal. Internal stresses occur in adhesive joints because of a natural tendency of the adhesive to shrink during setting.

STUDY ON THE TEMPERATURE EFFECT ON LAP SHEAR ADHESIVE JOINTS IN LIGHTWEIGHT STEEL CONSTRUCTION A dissertation approved by the F aculty of Architecture, Civil Engineering and Urban Planning, Brandenburg University of Technology Cottbus -Senftenberg to obtain the academic degree of DOCTOR -ENGINEER by -Eng.

Samer. The effects of moisture on an adhesively bonded joint may be related to the adhesive's ability to absorb moisture. In many cases, an adhesive will absorb moisture very readily since its backbone is made up of many hydrophilic by: Environmental effects on the ageing of epoxy adhesive joints.

Adhesive bonded joints are exposed to a range of different environments in aerospace applications. This paper reports dielectric and mechanical analysis of aluminium–epoxy bonded adhesives joints exposed to de-ionized water, aqueous urea solution and salt water at 65°C.

external loads influenced the mechanical behaviour of adhesive joints. Brewis et al. [8] studied single lap joints bonded with an epoxide-polyamide adhesive exposed to warm a moist environment for up to hours and concluded that the moisture degradation was due to plasticisation of the adhesive.

The effect of polyester and nylon carriers on the durability of metal joints bonded with the modified epoxide adhesive BSL has been examined. Joints have been exposed to air at 50°C and adhesive by elevating the temperature of the conditioning environment. Further acceleration can be obtained by increasing the relative humidity (RH).

This eport r evaluates environmental conditioning methods for inducing accelerated moisture degradation within adhesively bonded joints.

The evaluation will attempt to relate the. The Effect of a Hot–Wet Environment on Adhesively Bonded Joints Under a Sustained Load Article (PDF Available) in The Journal of Adhesion 90(5. Summary This volume documents the proceedings of the Second International Symposium on Adhesive Joints: Formation, Characteristics and Testing held in Newark, NJ, MaySince the first symposium, held inthere had been tremendous research activity dealing with many aspects of adhesive joints.

The effect of the number of a laser shot, the scribe depth, the number of the scribe and the angle between the direction of the laser scribes and mechanical test direction on the adhesive bonding Author: Guy Davis. The present work focuses on the effects of water degradation on the fatigue behaviour of adhesive joints bonded with aluminium ad-herends.

The objective of this study is to measure the influence that humidity has on the fatigue crack growth velocity of two distinct adhesives characterized using the Paris Law, using double cantileverCited by: 5.

The Effect of Moisture on the Dimensional Stability of Adhesively Bonded Joints. Abstract. Torsion shear creep tests were made on two bisphenol A-type epoxy adhesives as a function of temperature, humidity, and applied stress.

The effects of varying the filler content of the two systems were also by: 4. How does environmental moisture affect the performance of an adhesive joint (pre-bond). • Environmental effects: Pre-Bond. – Adhesives (esp. epoxies) are often hydrophillic i.e. absorb moisture.

– Absorbed moisture reduces Tg, modulus and (usually) strength. – The moisture may be absorbed by adherends/adhesives prior to bonding. adhesive/adherend interface rather than weakening of the bulk adhesive [8].

Considering the environmental durability of adhesive joints, the most detrimental condition is hot-wet exposure [7]. In these conditions, the joint strength can dramatically be decreased as a function of exposed time.

Studies developed by Ferreira et al. [12] andCited by:   Science and Technology of Bolt-Adhesive Joints that the lack of suitably certified fasteners was one of the main contributing factors for the considerable delays the Dreamliner has.

If more than one environmental factor (e.g., heat and moisture) is acting on the sample, their combined effect can be expected to produce a synergistic result of reducing adhesive strength.

Whenever possible, the candidate adhesive joints should be evaluated under simulated operating loads in the actual environment the joint will encounter [2]. Oxidation can lead to weakening of joints if exposure takes place in an oxidative environment (Munns and Georgiou, ) and is usually associated with chemical changes in the adhesive layer.

Crazing can be induced by cooling the joint rapidly below its sub- T g transition and subjecting the structure to impact or stress. Adhesive Failure: Failure of a bonded joint between the adhesive and the substrate Primarily due to a lack of chemical bonding between the adhesive and the bonding substrate Can be indicative of poor surface preparation or contamination Or, incorrect adhesive selection for the substrate materials AdhesiveFailureFile Size: KB.

Adhesive stresses along a scarf plane vary significantly as the ply stiffness is strongly affected by its orientation (Wang and Gunnion, ), as presented in Chapter average stress failure criterion is based on equating the average shear stress along the bond line to the shear strength of the adhesive.

1 The strength prediction of adhesive single lap joints exposed to long term loading in a hostile environment X Han1,2, AD Crocombe2,*, SNR Anwar3, P Hu1 1 School of Automotive Engineering, Dalian University of Technology, DalianPR China 2 Mechanical Engineering Science, University of Surrey, Guildford GU2 7XH, UK 3Civil Engineering.

Environmental Degradation of Adhesive Joints Single-Lap Joint Geometry W R Broughton, R D Mera and G Hinopoulos Centre for Materials Measurement & Technology National Physical Laboratory Teddington Middlesex TW11 0LW, UK ABSTRACT The single-lap shear est is the most widely used method for producing int -situ shear.

Adhesive Joints - Design and Calculation 9 pages, 10 figures Basic Level prepared by Lutz Dorn, Technische Universität, Berlin Objectives: − to describe the basic types of loadings of adhesive joints and to give examples of recommended joint designs − to calculate the strength of adhesive joints Prerequisites.

The apparent shear stress, τi, on the adhesive at each point was calculated using equation 1 below. τi = A Pi (1) where Pi is the axial load and A is the initial overlap area (overlap length times width).

The next step in the process was to find the adhesive shear Size: 1MB. With most modern high peel strength adhesives joint failure in metal to metal bonds will invariably occur through a cohesive failure of the adhesive.

Thus it is a reasonable premise that analysis based on the material properties of the adhesive and adherend should provide a good tool for joint Cited by: 6. ISO describes laboratory ageing conditions under which adhesive joints may be exposed to various environmental influences -- climatic or chemical -- for the purpose of assessing the effects of such influences on certain ry: p.

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. Finite element analysis (FEA) was used to establish the effects of these parameters on the joint stiffness, stress and strain distributions within the adhesive layer, and joint strength.

A series of simulated experiments using FEA were conducted on single-lap and scarf joints to determine the effects of adhesive layer (bondline) thickness,File Size: KB. The factors affecting the mechanical and environmental durability (or stability), and performance of the adhesively bonded joints in various adherends including metallic alloys, polymers and composite materials are studied in detail.

The primary function of a joint is to transfer load from one structural member to another. In most bonded joints the load transfer Cited by: Going by this observed pattern, it seems logical to conclude that the strongest adhesive joint among all the formulations might as well be the sun-cured adhesive joint based on the blend derived from NR, Ac and VA/Ve blends in the ratio of 1///6, respectively.

Cyclic Fatigue Testing of Adhesive Joints Environmental Effects W R Broughton and R D Mera Centre for Materials Measurement & Technology National Physical Laboratory Teddington Middlesex TW11 0LW, UK ABSTRACT This report examines the combined effect of cyclic loading and environment (i.e.

elevated. Abstract. The previous four chapters have discussed various aspects in the formation of adhesive joints. This chapter, and the following two, will consider various aspects of the mechanical behaviour and the mechanics and mechanisms of failure of adhesive by: results.

The adhesive layer in the tapered single lap joint is modelled by using a cohesive zone with a bi-linear traction-separation response. The adverse effect of increasing fatigue mean stresses on the failure behaviour of adhesively bonded joints is successfully Size: KB.

In this study, the degradation mechanism of chip resistors mounted with Ag–epoxy isotropic conductive adhesive (ICA) under two different environmental conditions, i.e., humidity exposure (85°C/85% relative humidity) and thermal cycling (TC, –40°C to °C), was examined by monitoring the change in electrical resistance and by transmission electron microscopy.

The effect Cited by:   The first step in developing a test method and model for predicting the environmental fracture data of butt adhesive joints has been proposed that was independent of the detailed butt joint geometry.

The model was reasonably successful and accounted for the excessive crack tip blunting that occurred in the adhesives. of geometrical modifications on behavior of adhesive joints was carried out by Haghani (). The author investigated the effects of tapering of the laminate end and adding an adhesive fillet on strength and stress/strain distribution of adhesive joints used to bond CFRP laminates to steel mem-bers using numerical and experimental approaches.

This brochure provides new data on the economic and social benefits of air transport – including its valuable contribution to job creation and Gross Domestic Product (GDP). It also supplies, for the first time, regional economic data for Africa, Asia-Pacific, Europe, the Middle East, Latin America & the Caribbean and North America.

cyclic loads and environmental effects. The results show that (1) unsymmetrIc adhesive joints are inefficient and should be avoided, and (2) hygrothermal environments and cyclic loads dramatically reduce the structural integrity of the joint and require several joint lengths compared to those for static load with no environmental effects File Size: KB.

In addition the use of the masked mercaptans as an epoxy resin hardener leads to adhesive joints which show outstanding resistance to moisture. Thus Al/Al joints cured with a clinical epoxy formulation based on dicyandiamide as hardener (AV 8) failed in 30 days after exposure to water at (90{degrees}C) for 90 days.

The design of adhesively bonded joints is an important task to guarantee structural integrity. Fracture mechanics characterization tests for adhesive joints provide relevant mechanical properties to determine the adhesive toughness. Toughness is usually expressed in terms of the critical value for the strain release rate (Gc) which is the energy.

This paper presents a systematic investigation of the influence of sandblasting pretreatment parameters on the surface roughness and mechanical characteristics of adhesive-bonded joints. The preliminary surface treatment in a bonding process has two important aims: first of all, it eliminates contaminants (dust, grease, humidity and corrosion products) which can modify the Cited by: 7.

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 .effects on composites and adhesives.

The focus of the AADP is aging and damage processes in “young” aircraft, rather than life extension of legacy vehicles, thus the emphasis of research is on the behavior of new composite and adhesive systems.

Previous work has demonstrated that high quality joints were bonded using a peel-ply surfaceAuthor: Gilda A. Miner, Tan-Hung Hou, Sharon E. Lowther, Sheila A. Thibeault, John W. Connell, Sheila Roman. Design and ageing of adhesives for structural adhesive bonding – A review Show all authors.

Richard A Pethrick. Effect of carriers on the performance of aluminium alloy joints bonded with an epoxide polyamide adhesive. Moisture absorption–desorption effects in adhesive by: