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SMLab - Structural Mechanics Lab

Area bacheca: 793&


Contact: Prof. Sergio Baragetti
Address: Department of Management, Information and Production Engineering - Building B via Galvani - Dalmine (BG)
Email: sergio.baragetti@unibg.it
Tel.: ++39.035.2052382
Fax: ++39.035.2052077
Web: www.unibg.it/smlab



AIMS

Static and fatigue resistance of machine components are basically important in the field of machine design. Also structural element design, even for fields other than the mechanical one, may be developed with simulation and analysis methods typical of mechanical design. Despite the automated tools used for component and structure calculation, e.g. the finite element (FE) method, enable to foresee stress and strain maps - even in the presence of complex geometries, cracks, defects, localized plasticization and contact/impact phenomena - experimental tests still play an essential role. The synergy between automated calculation methods and experimental evidence makes it possible to study and solve complex structural problems and to determine the safety factors of both machines and components - as well as the mechanical systems which they belong to.


SCIENTIFIC SKILLS AND TECHNIQUES/RESEARCH ACTIVITIES

  • Mechanical design: static and fatigue resistance of machine components



  • Structural design: strength of mechanical components and systems


  • Structural calculation by means of the FE method: both linear and nonlinear (with respect to contact phenomena, displacements and material behaviour) analyses; high speed contact/impact phenomena simulation


  • Finite element numerical and experimental study of the effects induced on the fatigue resistance of machine components by surface treatments (shot peening, rolling, nitriding, case hardening, thin hard coatings)




  • Numerical modelling of defects and cracks in machine components and evaluation of their influence on the fatigue resistance




  • Stress state experimental acquisition with strain gages


  • Development of expert tools to select machine components, mechanical systems and treatments


  • Development of analytical models to assess the buckling and bending behaviour of plunger-rod or double-effect hydraulic actuators


  • Analysis of components and structures
    • analytical, numerical and experimental study and optimization of threaded connections strength
    • buckling and bending behaviour of hydraulic actuators
    • design and probabilistic analysis of ropeways
    • design of elevators, lifting and transportation systems



  • Probabilistic analysis of components and structures and implementation of Quality Engineering methods, e.g. Analytic Hierarchy Process (AHP) and Design of Experiments (DoE), applied to components, mechanical systems and treatments selection procedures; expert tools utilization


  • Study of non-linear bending of metallic wires in order to develop analytical models able to evaluate the stress state over the cross section and to foresee the final residual curvature after unloading