Elasto-Plastic Fatigue Life Improvement of Bolted Joints and Introducing FBI Method<sup><i>#</i></sup>

Honarmandi, Peyman; Zu, Jean W.; Behdinan, Kamran

doi:10.1080/15367730500374381

Cited by 17 publications

(10 citation statements)

References 9 publications

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“…4 present variations of the relative loading cycles T sum /N 0C against an increased number of positioning periods u. Here, curves 1 respond to the results of model I obtained by expressions (9), curves 2 respond to the results of model II obtained by expressions (14) and curves 3 respond to the results of model III obtained by expressions (16). Each of the above families of the curves contain results obtained for two relative maximum nominal stresses,  n,max /R p0.2 =0.85 drawn by solid lines and  n,max /R p0.2 =0.59 drawn by dot lines, respectively.…”

Section: Increasing the Threaded Joint Lifetimementioning

confidence: 61%

“…The solution in terms of critical cycling numbers gives the expression: (13) while the total number of loading cycles is: (14) Model III. The problem is formulated by assuming the equivalence of all the loading periods j=1, 2,…u.…”

Section: A Krenevičius / Jmm 48 (2) B (2012) 291 -307mentioning

confidence: 99%

“…For example, there are nuts with tapered threads [11,12], nuts with bevel at the loaded face [13] or stud threads with gradually reduced height in the direction of the bearing surface of the nut [14]. Applying such nuts or bolts, the stresses in the thread roots are reduced rather effectively.…”

Section: Introductionmentioning

confidence: 99%

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Increasing the cyclic strength of threaded joints through the unloading of cracked sections

Krenevičius

Kačianauskas

Leonavičius

et al. 2012

J min metall B Metall

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The cyclic strength of the axially loaded threaded joints is considered and the procedural method to increase their lifetime through the unloading of cracked sections is presented. The method operates by varying the mutual positions of the stud and the nut. It was shown how to exploit resources of the threaded joint after opening of the crack without reduction of the safety. The developed mathematical model allows control the accumulation of the fatigue damage as well as the crack growth in the roots of the stud thread. Increase of the cyclic lifetime is theoretically evaluated by the ratio of the numbers of loading cycles required to initiate cracks in the roots of unengaged and the most dangerous engaged turns of the stud. Performance of the elaborated technique is demonstrated by considering the crack growth in depth of the nut. The relative safety of the unloaded cross-sections containing cracks is studied. Comparison of the presented developments with standard safety requirements is presented

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Section: Increasing the Threaded Joint Lifetimementioning

confidence: 61%

Section: A Krenevičius / Jmm 48 (2) B (2012) 291 -307mentioning

confidence: 99%

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Increasing the cyclic strength of threaded joints through the unloading of cracked sections

Krenevičius

Kačianauskas

Leonavičius

et al. 2012

J min metall B Metall

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“…16 would be beneficial under axial fatigue loads. Some recent analysis [23] of the effect of stress concentrations in bolted joints has suggested that only the first engaged thread is critical in fatigue and that underhead radius and thread runout design do not affect fatigue strength of bolts. It is also suggested that ''…preload is not widely adopted on site''.…”

Section: Thread Runoutmentioning

confidence: 99%

High Strength Engineering Fasteners: Design for Fatigue Resistance

O'Brien

Metcalfe

2009

J Fail. Anal. and Preven.

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One of the most frequently encountered causes of failure in engineering fasteners is fatigue. Typical locations for the fatigue of fasteners are the stress concentrations represented by the head to shank fillet, the first engaged thread and the thread runout. These locations are examined in relation to design rules known for over 60 years to be effective in reducing the stress concentration effect, but seldom used in engineering bolts, despite their relative simplicity. These design rules are also examined in relation to common fastener standards and their silence with regard to fatigue considerations.

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“…They observed that unlike for high cycle fatigue, the low cycle fatigue where max / Y is more than 50%, the fatigue life of bolt is not significantly influenced by the mean stress and the stress range. Honarmandi et al 13 introduced a new design named FBI which stands for ''Fatigue-Bolt-Improvement'' method. They have shown that their geometrical modification on thread flank type, thread root radius, thread runout, and head fillet radius will greatly reduce the stress concentration at the critical area, and will increase the fatigue strength of the bolt as compared to the classic standard bolt.…”

Section: Introductionmentioning

confidence: 99%

Improvement of performance of bolt–nut connections, Part II: Experimental investigation

Majzoobi

Dabbagh

Asgari

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this work, bolt and nut geometries are modified for the improvement of fatigue life of the bolt–nut connections. The modifications are aimed at reducing the stress concentration at the thread roots by factors such as reducing the shank diameter, making axial hole in bolt, stepping the nut and their combinations. The effect of modifications is studied by experiment and simulation. The experimental results show that all types of modifications considered result in an improvement in the fatigue resistance of bolt–nut connections but to different extents. However, the effects of the two latter types are more significant. The most improvement is achieved for the case when all types of modifications are combined together. In this case, fatigue life can be increased by almost 100%. Numerical results also show that all types of modifications lead to the reduction of stress concentration.

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Elasto-Plastic Fatigue Life Improvement of Bolted Joints and Introducing FBI Method^#

Cited by 17 publications

References 9 publications

Increasing the cyclic strength of threaded joints through the unloading of cracked sections

Increasing the cyclic strength of threaded joints through the unloading of cracked sections

High Strength Engineering Fasteners: Design for Fatigue Resistance

Improvement of performance of bolt–nut connections, Part II: Experimental investigation

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Elasto-Plastic Fatigue Life Improvement of Bolted Joints and Introducing FBI Method#

Cited by 17 publications

References 9 publications

Increasing the cyclic strength of threaded joints through the unloading of cracked sections

Increasing the cyclic strength of threaded joints through the unloading of cracked sections

High Strength Engineering Fasteners: Design for Fatigue Resistance

Improvement of performance of bolt–nut connections, Part II: Experimental investigation

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Product

Resources

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Elasto-Plastic Fatigue Life Improvement of Bolted Joints and Introducing FBI Method^#