A New Method for Fatigue Life Improvement of Screws

Nishida, Shinichi; Urashima, Chikayuki; Tamasaki, Hidetoshi

doi:10.1016/s1566-1369(97)80021-0

Cited by 14 publications

(4 citation statements)

References 1 publication

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“…Nishida et al (1997) also designed a new bolt named CD bolt (Critical Design for Fracture) and indicated that the fatigue life can be improved almost twice. Honarmandi et al (2005) studied the effects of four geometrical parameters, namely, flank type, root radius, thread run-out, and head fillet radius on fatigue life.…”

Section: Fatigue Strength Improvementmentioning

confidence: 99%

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Effects of root radius and pitch difference on fatigue strength and anti-loosening performance for high strength bolt–nut connections

Noda

Wang

Oda

et al. 2021

Advances in Structural Engineering

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The fatigue strength improvement and anti-loosening performance are studied experimentally and analytically for JIS M16 bolt–nut connections. Three different root radii are considered coupled with three different pitch differences. The enlarging the bolt root radius improves the fatigue limit of the bolt by more than 30% because both stress amplitude and mean stress can be reduced. Furthermore, suitable pitch difference improves the fatigue limit by more than 25%. This is because under no pitch difference the crack initiation always occurs at No.1 or No.2 threads close to the bolt head causing the final failure; however, under a suitable pitch difference the crack initiation occurs at No.6 or No.7 threads far away from the bolt head. Good anti-loosening performance can be expected for the bolt–nut connections having enlarged root radius because the prevailing torque [Formula: see text] = 19 Nm and the residual prevailing torque [Formula: see text] are not smaller compared to other special bolt–nut connections.

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Section: Fatigue Strength Improvementmentioning

confidence: 99%

“…Previously, Walker et al (1970), Yoshimoto et al (1978), and Nishida et al (1997) studied the root radius effect on the fatigue strength without providing pitch difference. Those results did not show significant fatigue strength improvement although the stress concentration can be reduced.…”

Section: Fatigue Strength Improvementmentioning

confidence: 99%

Effects of root radius and pitch difference on fatigue strength and anti-loosening performance for high strength bolt–nut connections

Noda

Wang

Oda

et al. 2021

Advances in Structural Engineering

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“…Majzoobi et al [13] studied the thread pitch and found that ISO standard coarse threaded bolts have a higher fatigue life than the fine threaded bolts. Nishida [16] discussed the effect of type of thread on the fatigue life of screws, including triangular thread, trapezoidal thread, positive buttress thread and negative buttress thread. It was found that the traditional triangular thread has an excellent total balance when considering fatigue strength and machinability.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Failure Analysis for Bolt-Nut Connections having Slight Pitch

2015

APH

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“…Their results indicate that bolt clamping force increases both fatigue crack initiation and fatigue crack growth lives individually. Nishida et al 18 developed a new method called CD bolt which stands for ''critical design for fracture'' to enhance the fatigue strength of bolt. In this new method, the profile of the bolt thread is improved.…”

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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A New Method for Fatigue Life Improvement of Screws

Cited by 14 publications

References 1 publication

Effects of root radius and pitch difference on fatigue strength and anti-loosening performance for high strength bolt–nut connections

Effects of root radius and pitch difference on fatigue strength and anti-loosening performance for high strength bolt–nut connections

Fatigue Failure Analysis for Bolt-Nut Connections having Slight Pitch

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

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