Clamp Load Loss due to Fastener Elongation Beyond its Elastic Limit

Nassar, Sayed A.; Matin, Payam

doi:10.1115/1.2217971

Cited by 29 publications

(12 citation statements)

References 4 publications

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“…The necrosis will cause the bone around the fixation area to crumble and weaken the purchase strength of the fixation between the nut at the bolt [23]. The common problem that causes self-loosening of the bolted joints is slippage, plastic deformation of the fastener, and fretting wear between the contact surfaces [24]- [27]. Self-loosening is the result of complete thread slip and localized slip at the screw head surface [28].…”

Section: Ricci Et Al [35]mentioning

confidence: 99%

Screw-Bone Implant Loosening: Complication, Cause and Assessment

Ghani¹,

Hassan²,

Daud³

2018

IJET

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Bone fracture has become more common in this era of vehicular modernization. Internal fixation has been used in the treatment of such cases. The use of screw and plate in internal fixation has been proven to provide more stability to fracture to promote better healing. The use of screw also carries certain risk such as self-loosening that can cause non-union and prolong healing. The complication of selfloosening is studied to comprehend the danger of self-loosening in screw-bone implant. The review on self-loosening in bolted joint is done in this paper to gain better understanding on the nature of self-loosening phenomena. The factor that affects the screw selfloosening in bone is further studied in the screw-bone implant environment. The identification of the screw loosening can be done with radiography, CT scan, MRI and ultrasound. This article have done a brief review on the complication of screw self-loosening, the cause of screw loosening in bolted joint and screw-bone implant and the assessment of screw loosening done by ultrasound and radiography.

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Section: Ricci Et Al [35]mentioning

confidence: 99%

Screw-Bone Implant Loosening: Complication, Cause and Assessment

Ghani¹,

Hassan²,

Daud³

2018

IJET

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“…In order to obtain experimentally the bolt clamping force (bolt pre-load) in a joint, there are different kinds of methods such as torque wrench method [34], angle control method [35], ultrasonic method [36,37] and load cellstrain gage method [13,14,[38][39][40]. In this research, owing to its better accuracy compared to other methods, the load cell and strain gage method was applied.…”

Section: Measurement Of the Pre-loadmentioning

confidence: 99%

On the Variation of Clamping Force in Bolted Double Lap Joints Subjected to Longitudinal Loading: A Numerical and Experimental Investigation

Chakherlou

Razavi

Aghdam

2011

Strain

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This study investigates the variation of clamping force and its concomitant effects on the performance of bolted double lap joints subjected to longitudinal loading. Two different amounts of clamping force were applied to bolted double lap joints made of Aluminium 2024‐T3, and variations of clamping force were measured under the application of longitudinal loading. Finite element modelling was also performed to compare with experiments. The results unanimously revealed a gradual initial reduction of clamping force followed by a significant increase as the longitudinal load was increased. Also affected, was the load transfer mechanism in the joint resulting in variation of friction force between the plates, but in a different trend compared to clamping force. Finally, the key parameters have been discussed and highlighted pertaining to the performance of the joint.

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“…However, there was no consideration for strain hardening effects. In a subsequent study, Nassar and Matin 12,13 developed a nonlinear strain hardening model and investigated the effect of the fastener strain hardening rate on the clamp load loss. Nassar et al.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on initial loss of tension in bolted joints

Zhu

Hong

Gao

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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The initial loss of tension in individual bolts after initial tightening obviously affects the level and the stability of the clamp load in bolted joints. A high-precision instrument to analyze the clamp load loss was developed. In this instrument, an Atlas Copco’s high performance spindle with an accuracy of ±2.5% under the conditions of one million duty cycles was used to tighten the test bolts and nuts. A rotary torque-angle transducer was integrated in the tightening spindle to measure the tightening torque. KMR force washer with a repeatability of < ±1% was applied to monitor the clamping force in real time. Using this instrument, the design of experiment analysis was performed to determine the effect of variables on the initial loss of tension. Those variables included the joint materials, the fastener class, the gasket grade, the lubrication, the surface roughness, the tightening speed, and the number of repeated tightening. The results showed that the tightening speed and the number of repeated tightening had a significant effect on the initial loss of tension. Moreover, a process criterion of eliminating plastic deformation was proposed to minimize the initial loss of tension. The findings presented in this paper will be expected to enhance the reliability and the safety of bolted assemblies, especially in critical applications.

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Clamp Load Loss due to Fastener Elongation Beyond its Elastic Limit

Cited by 29 publications

References 4 publications

Screw-Bone Implant Loosening: Complication, Cause and Assessment

Screw-Bone Implant Loosening: Complication, Cause and Assessment

On the Variation of Clamping Force in Bolted Double Lap Joints Subjected to Longitudinal Loading: A Numerical and Experimental Investigation

Experimental study on initial loss of tension in bolted joints

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