130,678 research outputs found
Interaction between pyroclastic flow and the building structures of an urban settlement. A fluid-dynamic simulation impact model
No full textREDESIGN OF ENERGY ABSORBING CAR COMPONENT BY CRASH TEST SIMULATION
No full textThis paper deals with the redesign of a car energy absorbing systems (EAS) for low impact forces in an integrated virtual environment
Analysis of Rope Joints for Ropeway Plant
No full textIn this paper, ropes joints used for ropeway plants, they have been studied. The ropes used in the ropeway plant are submitted to requirements that concern every aspect of the design criteria. By mean this study, it has been possible to obtain a method that allows to compute the bending maximum stress for joints muffs used in ropeway plants. In fact examining the lines considered, we have to evaluate four differential equations, and they have been integrated by mean the constants variation method. Integration constants have been evaluated determining for each transition section, the lines deflections and the lines rotations. In this way, it has been possible to evaluate the formula obtained for this case examined. This formula is furthermore very interesting because, its form is similar to that determined by Isaachsen for these cases, and then it is possible to perform an easy comparison between the two considered formulas. Further using the program code FEMLAB we have verified the stress condition for the considered rop
Hydrotreated Vegetable Oils for Compression Ignition Engines—The Way Toward a Sustainable Transport
No full textThe COP26 goals rapidly accelerate the shift of road transport to electric vehicles (EVs). However, the global transition to EVs should be assessed carefully. A forced transition to electric mobility without tailored solutions for each case can increase greenhouse gas (GHG) emissions. In this context, low-carbon fuels can be considered a promising short-term solution to efficiently reach the carbon neutrality target. This manuscript aims to highlight the competitive advantages of hydrotreated vegetable oil (HVO) over commercial diesel fuel. Recent works on HVO are consid-ered, ranging from exploring the production processes and spray evolution character-istics to the various engine strategies to highlighting the potential. Greater emphasis was placed on environmental impact assessment, considering the results available for Life Cycle Assessment (LCA) and Well-To-Wheel. The main characteristics and influences of HVO in CI engines are assessed on the combustion process, GHGs, and pollutants emissions. The results show the high potential of the HVO to reduce the impact of the road transport sector actively. It is highly compatible with existing engines and fueling systems while ensuring lower CO2, CO, THC, PM emissions, and combustion noise levels with similar efficiency and fuel consumption. Addition-ally, the residual feedstock can assure up to 75% GHG over the whole life cycle. Therefore, sustainable fuels, such as HVO, combined with advanced technologies could not only support the reduction of tailpipe emissions but also benefit the overall CO2 assessment
LCF of a Particulate Reinforced Titanium Sintered Composite at Various Temperatures
No full textParticulate reinforced Titanium Matrix Composites (pTMC) have a lower cost with respect to long fiber reinforced titanium composites. They can also easily be machined, forged, rolled and extruded.
In this paper, the LCF properties of a pTMC have been investigated. The pTMC characterised in this study is a commercial available powder metallurgy product and is known as CermeTi-10-C. A composition with 10% wt of TiC in a Ti6Al4V matrix was selected. It hasbeen CHIP processed. No subsequent forging or plastic deformation process has been carried out.
Load control fatigue tests have been carried out both at room temperature and at two higher temperatures. Data points will be presented in 10^3 - 2*10^6 cycle rang
The importance of cortical bone orthotropicity, maximum stiffness direction and thickness on the reliability of mandible numerical models
No full textAim: To identify mechanical and geometrical variables affecting the biofidelity of numerical models of human mandible. Computed results sensibility to cortical bone orthotropy and thicknesses is investigated. Methods: Two mandible numerical models of different bone complexities are setup. In the low-complexity model, cortical bone is coupled with isotropic materials properties; constant thickness for cortical bone is adopted along the mandible structure. In the higher complexity model, the cortical bone is considered as an orthotropic material according to an independent mechanical characterization performed on fresh human dentate mandibles. Cortical thickness distribution, the values of the principal elastic moduli and principal directions of orthotropy are considered as piecewise heterogeneous. Forces for masseter (10 N), medial pterigoid (6 N), anterior (4 N) and posterior (4 N) temporalis muscles are applied to the models. Computed strains fields are compared with those experimentally measured in an independent test performed on a real human mandible in the same loading conditions. Results: Under closure muscles forces both models shows similar strain distribution. On the contrary, strain fields values are significantly different between the presented models. Conclusions: The mandible structure is sensible to compact bone orthotropy and thickness at the facial side of condylar neck, retro molar area and at the lingual side of middle portion of the corpus in molars area, anterior margin of the ramus. In these areas, it is advisable to use orthotropic properties for cortical bone to accurately describe the strain state. © 2010 Wiley Periodicals, Inc
Stakeholders’ inclusion: more than a cup of tea? An evaluation model for participatory decision
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