How can a team of mechanical engineers garantee the reliability and safety of bolted joints in new cars, planes or mobile phones, before they go into production?
It is a well known fact that dynamic forces introduce stress and fatigue into mechanical systems and reduce their service life. Vibration can loosen fasteners, leading to dramatic failures. Finite element analysis (FEA) is essential for determining structural robustness, but cannot predict accurately fastener self-loosening behaviour, while prototyping in real conditions is costly and time-consuming.
Successful companies validate new bolted joints designs by performing dynamic fastener tests in laboratory on a transverse vibration test machine. This rapid and cost-effective “Junker test” test allows engineers to simulate real life dynamic vibration conditions on a single component or an assembly. The data analysis aids engineers to specify the right choice of bolts, nuts and fastener locking products and guarantee the assembly will remain tightly secured even in harsh service conditions.