A Study on Bearing Surface Pressure Distribution of Bolted Joints (Influences of Angular Deviation of Bearing Surface)

Okada, Manabu; Kasei, Shinji; Tanaka, Michihiko

doi:10.1299/kikaic.70.3324

Cited by 4 publications

(2 citation statements)

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“…6. If all conditions are the same, a taper nut has much larger bearing surface friction torque compared with a hex nut (12) or a hex nut with a flange (13) of the same nominal diameter. Furthermore, the bearing surface friction torque can be enlarged by giving negative c φ ∆ .…”

Section: Elasticity Analysismentioning

confidence: 99%

Bearing Surface Pressure Distribution of Nut with Cone-form Bearing Surface

Okada

Kasei

2008

JAMDSM

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Recently, wheel separation accidents in such vehicles as trucks, buses and passenger cars have drawn a social concern. Explications of their causes and adequate practices of countermeasures for them have been urgently required. In relation to this issue, the authors have taken notice of subjects which are concerned in bolted joints at wheels and are especially trying to study the pressure distribution at the bearing surface of nuts. This report deals with the subject of a nut with a cone-form bearing surface. Considerations are based on numerical results derived from finite-element-analysis. Feature of the pressure distribution by this profile and influences from geometrical deviations of the form are mainly discussed, and some other information concerning this issue is presented.

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Section: Elasticity Analysismentioning

confidence: 99%

Bearing Surface Pressure Distribution of Nut with Cone-form Bearing Surface

Okada

Kasei

2008

JAMDSM

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“…12 Moreover, in a report on the sensitivity improvement of the thin plate sensor for bolt loosening that the Nakahara is studying, it is reported that the sensitivity of detection in the high tightening axial tension band is improved by installing a conical spring washer in bolted joint. A conical spring washer in bolted joint raises purposely the surface pressure of the inner side.…”

Section: Influence By Contact Surface Pressurementioning

confidence: 99%

Effect on detection sensitivity for smart washer configuration and ambient temperature characteristics on bolted joint

Okugawa

Tanaka

2007

SPIE Proceedings

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The objective of this study is to apply the concept of structural health monitoring to the detection of bolted joints loosening without human involvement. This paper proposes a method of bolt loosening detection by adopting a smart washer with sub-space state space identification (4SID) algorithm. The smart washer is the cantilevered plate type washer bonded piezoelectric material. The feature is the self-sensing and actuation function. The principle of how to detect the loosening of a bolt is the basis that the natural frequency of a smart washer system vary depending on a bolt tightening axial tension. The natural frequency of the smart washer was identified by using the sub-space state space identification method. For practical use of the smart washer, it is necessary to investigate the problem of repeatability and data quality depending on the influence of the ambient temperature characteristics, and to improve the sensitivity at the initial state of the bolt tightening axial tension decreasing. This paper describes the results of experimental and analytical about the effect on the sensitivity for the smart washer configuration, and the ambient temperature characteristics on the bolted joint. The experimental results indicate the influence of the temperature variation to the bolt tightening axial tension. In order to the sensitivity of the improve bolt loosening detection, vibration-modal analysis of the smart washer system is performed for the configuration of the smart washer. The design parameters of the smart washer was discussed on the results of the numerical simulation.

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