47. STEFANO FREGONESE
Information acquired: 2025
STEFANO FREGONESE is an academic who published a paper in 2022 entitled Mechanics of needle insertion and deep penetration in soft solids. STEFANO FREGONESE published this work as part of a team: Fregonese, Stefano. Here is a description of this work: Thi,, thesis examines the mechanical problem of piercing a soft solid body with a needle. This process is initiated by the critical condition of needle insertion and continued by deep penetration. This work describes both phenomena, in relation to material properties and needle size, with simple mechanical models and compares them against experiments. Needle insertion is characterized by physical and geometrical nonlinearities and a complex failure mechanism. To overcome the complexity of the problem, needle insertion is modelled as a sharp transition between two needle-specimen configurations, namely ‘indentation' and ‘penetration'. The configurational transition is driven by minimum energy, where 'penetration' becomes favoured over 'indentation' at larger depths. The mechanism of penetration is strongly influenced by friction and adhesion, which provid.