Search results for " mechanical behaviour"

showing 3 items of 3 documents

Discussion on “Experimental Deformation of Opalinus Clay at Elevated Temperature and Pressure Conditions: Mechanical Properties and the Influence of …

2021

AbstractThe testing procedure and results on saturated samples of Opalinus Clay in the work of Schuster et al. (Rock Mech Rock Eng https://doi.org/10.1007/s00603-021-02474-3, 2021) were conducted and presented using strain rates two to four orders of magnitudes higher than the rates needed to allow pore pressure equilibrium in the material, both in drained and undrained conditions. This leads to an erroneous estimation of the mechanical properties in saturated conditions. We discuss this aspect in the context of shale testing. We also discuss the effect of drying-induced fissuring on the mechanical properties of geomaterials tested in dry conditions.

Clay rock Desiccation cracks Micro-fissuring Opalinus Clay Pore pressure generation Rate-dependent mechanical behaviour ShaleSettore ICAR/07 - GeotecnicaClay rockGeologyContext (language use)Strain rateGeotechnical Engineering and Engineering GeologyPore water pressureTemperature and pressureGeotechnical engineeringDeformation (engineering)Oil shaleGeologyCivil and Structural EngineeringRock Mechanics and Rock Engineering
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Microstructure and mechanical behaviour of a saturated compacted scaly clay

2011

The paper presents the results of a research on the influence of structure characteristics on the mechanical behaviour of a saturated compacted scaly clay. To this aim, mechanical properties of compacted scaly clay samples after saturation are compared with the corresponding properties measured on the clay reconstituted in the laboratory. For the stress range explored in the experimental programme, compacted scaly clay samples are stiffer and stronger than reconstituted clay samples owing to their greater density. Collected results are discussed taking in consideration microstructure characteristics of the compacted and reconstituted clay samples

Settore ICAR/07 - Geotecnicascaly clay experimental investigation microstructure mechanical behaviour
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Standard mechanical testing is inadequate for the mechanical characterisation of shape-memory alloys: Source of errors and a new corrective approach

2022

Thanks to its unique behaviour characterised by a superelastic response, Nitinol has now become the material of preference in a number of critical applications, especially in the area of medical implants. However, the reversible phase transformation producing its exceptional comportment is also responsible for a number of phenomena that make its mechanical characterisation particularly complex, by hindering the assumptions at the very basis of common uniaxial tensile testing. This necessarily reduces the level of safety and design optimization of current applications, which rely on incorrect mechanical parameters. In this study, the spurious effects introduced by the unconventional material…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineMechanics of MaterialsMechanical EngineeringGeneral Materials ScienceDigital image correlation (DIC) Local mechanical behaviour Shape memory alloy (SMA) Uniaxial tension test
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