Accelerated Vibration Life Tests of Threadlocking Adhesive

Threadlocking adhesives are widely used in industry to reduce self-loosening of threaded fasteners in dynamic environments. However, accelerated vibration life tests for such adhesives have not been reported in the literature. This paper reports on the development of an apparatus and test procedure to evaluate threadlocking adhesive life when subjected to accelerated vibration testing. Data from e ve different threadlocking adhesives are presented and compared. The data for each adhesive is found to e t a Weibull distribution. The relationship between threadlocking adhesive life and applied vibration level is shown to be modeled quite well with an inverse power relationship. Nomenclature F(t) = cumulative distribution g = acceleration constant k = empirical constant n = empirical constant p = percentage t = time V = vibration level g = Weibull shape parameter u = Weibull scale parameter tp = percentile