Degradation of Fatigue Properties of Weld-Bonded Aluminum Exposed to Moisture and Elevated Temperature

Wang, P. C.; Mabery, Pamela; Chisholm, C. K.

doi:10.1080/00218469308026592

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…It is not surprising, therefore, that the level of understanding of fatigue in adhesive joints is not as advanced as that for many metals. However, adhesive joints are generally considered to have good fatigue resistance compared with alternative joining techniques, such as spot welding or bolting [4,5]. This has been attributed to the reduction in stress concentrations, which deleteriously affect the fatigue life of metals.…”

Section: Introductionmentioning

confidence: 99%

A simple model to predict crack growth in bonded joints and laminates under variable-amplitude fatigue

Ashcroft

2004

The Journal of Strain Analysis for Engineering Design

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It is now well established that adhesives and fibre-reinforced polymers (FRPs) can fail at far lower loads under fatigue loading than under quasi-static loading. Most of the work on the fatigue of these materials has been under constant amplitude (CA); however, recent work has shown that fatigue crack growth acceleration and unstable crack growth can be seen under conditions of variableamplitude (VA) fatigue. In this paper, further evidence of this effect is given. This phenomenon is attributed to the influence of VA fatigue on the evolution of a damage zone ahead of the main crack front and results from the characterization of these damage zones are also presented. Finally, a simple fracture mechanics-based model for predicting crack growth under VA fatigue is proposed. This is shown to be entirely consistent with the experimental observations. NOTATIONa crack length da=dN fatigue crack growth rate C, m Paris law constants D Miner's damage sum FCG fatigue crack growth G strain energy release rate G arr critical value of G for crack arrest under quasistatic loading G C critical value of G for fast crack growth under quasi-static loading G max maximum value of G in a fatigue cycle G min minimum value of G in a fatigue cycle N number of fatigue cycles N C number of cycles to crack jump in variableamplitude fatigue N f number of cycles to failure N OL number of overload cycles N R ratio of overloads to constant-amplitude cycles R OL ratio of ÁG for constant-amplitude cycles to ÁG for overload cycles ¼ ÁG CA =ÁG OL R stress ratio ¼ min = max R displacement ratio ¼ min = max max maximum displacement in fatigue min minimum displacement in fatigue ÁG strain energy release rate range ¼ G max ÿ G min ÁG A applied value of ÁG ÁG AC critical value of ÁG A for unstable crack growth ÁG CA ÁG for constant-amplitude cycles in variableamplitude fatigue ÁG OL ÁG for overload cycles in variable-amplitude fatigue ÁG th threshold value of ÁG for negligible crack growth ÁK stress intensity factor range max maximum stress in fatigue loading min minimum stress in fatigue loading damage parameter quantifying a shift in the constant-amplitude fatigue crack growth curve to account for load history E

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Section: Introductionmentioning

confidence: 99%

A simple model to predict crack growth in bonded joints and laminates under variable-amplitude fatigue

Ashcroft

2004

The Journal of Strain Analysis for Engineering Design

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“…Furthermore, they pointed out that the failure mode of the welded/bonded specimens was adhesive in the corrosive environment and cohesive in air. Wang et al [211] have further performed experiments to joints subjected to 100% RH at 38 • C. They found that the presence of water vapour at elevated temperature decreased the fatigue strength of welded/bonded joints by about 33% at 5 × 10 6 cycles.…”

Section: Welded/bonded Combining Welding and Bondingmentioning

confidence: 99%

Fatigue in Adhesively Bonded Joints: A Review

Wahab

2012

ISRN Materials Science

116

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This paper presents a literature review on fatigue in adhesively bonded joints and covers articles published in the Web of Science from 1975 until 2011. About 222 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 amplitude, impact fatigue, thermal fatigue, torsional fatigue, fatigue in hybrid adhesive joints, and nano-adhesives. The paper is concluded by highlighting the topics that drive future research.

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“…To facilitate the use of advanced high strength steels for lighter, stronger and more cost effective vehicle structures, design guidelines and predictive capability of dynamic performance for adhesive bonded joints are required. Their development will require not only detailed understanding of the static, fatigue and impact characteristics under various service environments [6][7][8] but also the failure mechanisms involved in adhesive bonded joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of low temperature exposure on impact characteristics of epoxy bonded high strength steels

Zhao¹,

Ma²,

Cai³

et al. 2011

Science and Technology of Welding and Joining

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In the development of vehicle structures, the proper selection of adhesives to bond the steels is important for safety of operation. In this study, toughened epoxy was tested for the ability to bond steels developed for low temperature use. Lap shear bonded DP600 and DP780 steel joints were prepared and tested in open air at ambient temperature and inside an environmental chamber at 240uC respectively using a split Hopkinson tensile bar machine. The impact properties of bulk adhesive at 240uC were also measured. It was found that the exposure of joints to a 240uC environment had little influence on impact strength and energy absorption. Scanning electron microscopy of fracture surfaces indicates differences in fracture paths and interfacial regions for the 240uC exposed specimens. Changes in the interphase region caused by low temperature exposure may contribute to an increased susceptibility of the adhesive joint to bond degradation.

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Degradation of Fatigue Properties of Weld-Bonded Aluminum Exposed to Moisture and Elevated Temperature

Cited by 3 publications

References 2 publications

A simple model to predict crack growth in bonded joints and laminates under variable-amplitude fatigue

A simple model to predict crack growth in bonded joints and laminates under variable-amplitude fatigue

Fatigue in Adhesively Bonded Joints: A Review

Effect of low temperature exposure on impact characteristics of epoxy bonded high strength steels

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