Due to the intensive decrease in grain sizes of nanocrystalline materials (NcMs), a large volume fraction of atoms reside in the interface regions between crystals forming an atom-cloud phase with a distinct atomic structure. Moreover, the surface to volume ratio of the grain increases, thus its surface energy will significantly affect the mechanical properties of NcMs.
Recently, the nonlocal elasticity theories have been used in studying the different behaviors of micro/nanostructures. However, there is a complicity in applying the natural boundary conditions in the context of the nonlocal differential elasticity models. Also, the nonlocal integral elasticity could provide a suitable remedy for this type of problems but with paying highly computational efforts.
In the present paper, for linear elastic materials, effects of couple stresses on micro/nanosolids are physically discussed and mathematically represented in the context of the classical, the modified and the consistent couple–stress theories. Then, an evaluation is provided showing the validity and the limit of applicability of each one of these theories. At first, the possible couple stress effects on mechanics of particles and on continuum mechanics are represented.
Several models have been developed over the past decades to capture the fracture and failure of ceramic materials. JH2, JHB models are widely used for simulating the behavior of armor plates upon ballistic impact. I have a doubt regarding these models. Are these models only valid when the impact velocity is in the order of 1000m/s, as under such circumstances material transitions from elastic to elastic-plastic regime defined by the HEL Pressure? But what about when the impact velocity of the ceramic is around 300-400 m/s (a fraction of ballistic impact)?
IMATI-CNR and the Mathematics Department of the University of Pavia offer a postdoc position on isogeometric analysis. This research project focuses on the design and implementation of innovative isogeometric methods for solid/fluid mechanics. In particular the target applications are related to
- nearly-incompressible and fibered materials
- fluids in geological formations
This research project is partially supported by the private sector, and is supervised by Annalisa Buffa (IMATI) and Giancarlo Sangalli (University of Pavia).
LONDON, UK and NEW YORK, NY, USA – May 18 , 2015 – Advanced Design Technology (ADT), a global leader in the development of advanced turbomachinery design methods and the TURBOdesign Suite is delighted to sponsor and exhibit at the ASME Turbo Expo 2015 in Montreal, Canada on 15 - 19 June where advanced methods for multidisciplinary optimization of turbomachinery components will be demonstrated.
The School of Mechanical Engineering and Mechanics (宁波大学机械工程与力学学院) is actively recruiting in all levels of broad fields and subjects of mechanical engineering include but NOT limited to Solid Mechanics, Fluid Mechanics, Thermomechanics, Vibrations, Noise, Machine Design, CAD, Manufacturing Engineering, Automotive Engineering, Material Processing, and others. The School has been receiving additional fundings in developing programs of undergraduate and graduate on Mechancial Engineering, Mechanics, Industrial Engineering, and other areas.
Hello everyone
I want to model the contact non-linearity between flange-web connection of FRP I-beam. I have modeled the flange and web of 3D deformable of shell element. I can't use VCCT technique between flange-web connection because it is based upon two surfaces not on one edge (i.e. web) and one surface (i.e. flange).
Kindly give some guidance to model the debonding of flange and web of I-beam.
Consider a ``neat'' function such as what an engineer is most likely to use in his typical theory/work. Such a function would typically be: (i) defined over a single finite interval, (ii) continuous throughout, and (iii) smooth enough. In other words, the sort of a function they used when they introduced the very idea of a graph of a function to you, back in high-school. ... Feel free to add any other qualifications you like, but note them explicitly, e.g., (iv) bounded throughout, and (v) periodic.
