italian version

Aims :

Educational targets: Provide the students with the background to understand the reliability problems in mechanical design, the failure modes, the methods used to calculate or improve the reliability of a mechanical system.

Topics :

Design of bolted junctions according to UNI 10011 standard: strength classes – correct and wrong layouts – load analysis – safety coefficients – friction based junctions – verifications against surface pressure and shear failure of metal sheets. Examples and exercises.
Basic concepts about failure: fatigue, wearing, random damage. Failure functions: Gauss normal distribution – Weibull function – exponential function. Reliability function. Failure rate. MTBF.
Experimental data interpolation. Reliability of used objects. Examples and exercises.
Reliability networks for complex mechanical systems – calculation of the reliability of a system composed by many parts. Safety coefficient choice, according to probabilistic evaluations.
Methods to improve reliability: components selection, tests, derating, redundancy.
FMEA e FMECA: examples of analysis for simple working mechanical systems. Fault tree. Examples and exercises.

Textbooks :

G. Nerli “Lezioni di Costruzione di Macchine”, Vol. I
Levrotto & Bella P.Citti, G. Arcidiacono, G. Campatelli “Fondamenti di Affidabilità” McGraw-Hill

F. Cirillo “Progetto di Sistemi Meccanici” McGraw-Hill

Exam :

Written and oral test.

Tutorial Session :

Da concordare con il docente.