DOE Investigation on the Effect of Dimensional Thread Tolerance on the Vibration-Induced Loosening of Fasteners

Housari, Basil A.; Nassar, Sayed A.; Dykas, Sebastian; Grzadzinski, Gerald A.

doi:10.4271/2007-01-1663

Cited by 1 publication

(1 citation statement)

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“…Nassar et al 18 investigated the effect of fastener material class, the thread pitch, and the fastener size on thread friction coefficient using the DOE method and found that the fastener material class has the most significant effect on the thread friction coefficient. Housari et al 19 performed a DOE analysis to study the effect of the variation of five thread dimensional parameters on the self-loosening of threaded fasteners. The results showed that the major diameter and its interaction with the thread pitch have the largest effect on the loosening behavior.…”

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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Section: Introductionmentioning

confidence: 99%