scholarly journals Ductile fracture modeling of metallic materials: a short review

2021 ◽  
Vol 16 (59) ◽  
pp. 1-17
Author(s):  
Riccardo Fincato ◽  
Seiichiro Tsutsumi
Keyword(s):  
Finite Elements ◽  
Physical Phenomenon ◽  
Constitutive Models ◽  
Ductile Failure ◽  
Short Review ◽  
Discrete Elements ◽  
Linear Deformation ◽  
Current State ◽  
Fracture Modeling ◽  
Traditional Approaches

Since the end of the last century a lot of research on ductile damaging and fracture process has been carried out. The interest and the attention on the topic are due to several aspects. The margin to reduce the costs of production or maintenance can be still improved by a better knowledge of the ductile failure, leading to the necessity to overcome traditional approaches. New materials or technologies introduced in the industrial market require new strategies and approaches to model the metal behavior. In particular, the increase of the computational power together with the use of finite elements (FE), extended finite elements (X-FE), discrete elements (DE) methods need the formulation of constitutive models capable of describing accurately the physical phenomenon of the damaging process. Therefore, the recent development of novel constitutive models and damage criteria. This work offers an overview on the current state of the art in non-linear deformation and damaging process reviewing the main constitutive models and their numerical applications.

Short Review and opinion: New matter properties and applications based on Hybrids Graphene based Metamaterials

2020 ◽  
Vol 04 ◽  
Author(s):  
A. Guillermo Bracamonte
Keyword(s):  
Short Review ◽  
New Materials ◽  
Design And Synthesis ◽  
Chemical Structures ◽  
Current State ◽  
Potential Applications ◽  
Fundamental Research ◽  
Miniaturized Instrumentation ◽  
And Control ◽  
Conductive Properties

: Graphene as Organic material showed special attention due to their electronic and conductive properties. Moreover, its highly conjugated chemical structures and relative easy modification permitted varied design and control of targeted properties and applications. In addition, this Nanomaterial accompanied with pseudo Electromagnetic fields permitted photonics, electronics and Quantum interactions with their surrounding that generated new materials properties. In this context, this short Review, intends to discuss many of these studies related with new materials based on graphene for light and electronic interactions, conductions, and new modes of non-classical light generation. It should be highlighted that these new materials and metamaterials are currently in progress. For this reason it was showed and discussed some representative examples from Fundamental Research with Potential Applications as well as for their incorporations to real Advanced devices and miniaturized instrumentation. In this way, it was proposed this Special issue entitled “Design and synthesis of Hybrids Graphene based Metamaterials”, in order to open and share the knowledge of the Current State of the Art in this Multidisciplinary field.

scholarly journals On Predicting the Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings

2018 ◽  
Author(s):  
Carmine Lima ◽  
Enzo Martinelli
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Parametric Analysis ◽  
Short Review ◽  
Structural Components ◽  
Main Structure ◽  
Current State ◽  
Critical Issues ◽  
Key Features ◽  
Two Degree Of Freedom

This paper is intended at highlighting the main mechanical parameters controlling the behavior of the so-called "acceleration-sensitive" Non-Structural Components (NSCs). In the first part a short review of the current state of knowledge and the critical issues related to the prediction of the seismic response of NSCs is reported. Then, the paper presents the results of a numerical parametric analysis intended to capture the key features of the dynamic response of a two-degree-of-freedom (2DOF) system which is supposed to be representative of both the main structure and the "non-structural" component (NSC). Particularly, it allows to simulate the coupled behaviour of both main structure and NSC and evaluating their response. The main parameters controlling the dynamic response of NSCs emerge from this study, which could pave the way towards formulating more mechanically consistent relationships for evaluating the maximum accelerations induced by seismic shakings on NSCs.

scholarly journals Liver transplantation for metastatic colorectal cancer (case report)

2019 ◽  
Vol 23 (4) ◽  
pp. 54-67
Author(s):  
I. A. Porshennikov ◽  
A. V. Sokolov ◽  
E. E. Shchekina ◽  
A. Yu. Chubukov ◽  
T. A. Tretyakova ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Liver Transplantation ◽  
Metastatic Colorectal Cancer ◽  
Short Review ◽  
Cancer Case ◽  
Current State ◽  
Cancer Metastases ◽  
Colorectal Cancer Case ◽  
Unresectable Liver Metastases ◽  
Colorectal Cancer Metastases

Liver transplantation is currently controversial for colorectal cancer metastases and not recommended in clinical guidelines. We report the first Russian case of liver transplantation from cadaveric donor in a patient with multiple bilobar unresectable liver metastases of colon cancer. We observe no recurrences within 10 months on everolimus-based immunosuppression and adjuvant treatment. The current state of the problem and the place of liver transplantation in metastatic colorectal cancer treatment are discussed in a short review.

Improving the 3D Finite-Discrete Element Method and Its Application in the Simulation of Wheel–Sand Interactions

2018 ◽  
Vol 15 (07) ◽  
pp. 1850059 ◽  
Author(s):  
Chunlai Zhao ◽  
Mengyan Zang ◽  
Shunhua Chen ◽  
Zumei Zheng
Keyword(s):  
Finite Elements ◽  
Discrete Element Method ◽  
Size Distribution ◽  
Sphere Packing ◽  
Discrete Element ◽  
Numerical Results ◽  
Contact Detection ◽  
Discrete Elements ◽  
Contact Algorithm ◽  
Packing Algorithm

An efficient sphere-packing algorithm named hierarchical generation method (HGM) is developed. The method is capable of efficiently generating spheres with a specific size distribution in a given geometric domain. Moreover, an improved contact algorithm for contact detection between spherical discrete elements and hexahedron finite elements (INTS) is presented. The algorithm is also suitable for simulating complex wheel–sand interactions. By using the developed algorithm, the running behaviors of a chevron tread-pattern wheel on a sand bed are simulated. The sand bed model is established by HGM and wheel–sand interactions are simulated using INTS. Numerical results validate the feasibility of the proposed method in the simulation of wheel–sand interactions.

Constitutive Modeling of Cartilaginous Tissues: A Review

2006 ◽  
Vol 22 (3) ◽  
pp. 212-229 ◽  
Author(s):  
Zeike A. Taylor ◽  
Karol Miller
Keyword(s):  
Solid Mechanics ◽  
Mechanical Response ◽  
Constitutive Models ◽  
Macroscopic Models ◽  
Cartilaginous Tissues ◽  
Alternative Approach ◽  
Wide Range ◽  
The Many ◽  
High Level ◽  
Traditional Approaches

An important and longstanding field of research in orthopedic biomechanics is the elucidation and mathematical modeling of the mechanical response of cartilaginous tissues. Traditional approaches have treated such tissues as continua and have described their mechanical response in terms of macroscopic models borrowed from solid mechanics. The most important of such models are the biphasic and single-phase viscoelastic models, and the many variations thereof. These models have reached a high level of maturity and have been successful in describing a wide range of phenomena. An alternative approach that has received considerable recent interest, both in orthopedic biomechanics and in other fields, is the description of mechanical response based on consideration of a tissue's structure—so-called microstructural modeling. Examples of microstructurally based approaches include fibril-reinforced biphasic models and homogenization approaches. A review of both macroscopic and microstructural constitutive models is given in the present work.

A Lagrangian Coupling Approach for the Combination of Finite-Discrete Element Method

2016 ◽  
Vol 846 ◽  
pp. 518-523 ◽  
Author(s):  
Hu Chen ◽  
Yi Xia Zhang ◽  
Meng Yan Zang ◽  
Paul Jonathan Hazell
Keyword(s):  
Numerical Methods ◽  
Finite Elements ◽  
Discrete Element Method ◽  
Lagrange Multiplier ◽  
Compatibility Condition ◽  
Degrees Of Freedom ◽  
Discrete Elements ◽  
Numerical Examples ◽  
Coupling System ◽  
Coupling Approach

In this paper, an effective approach to couple finite elements (FEs) with discrete elements (DEs) is presented. The proposed approach conforms to displacement compatibility condition at the interface between FEs and DEs, and this constraint is enforced by the Lagrange multiplier method. The coupling system is solved by the Gauss-Seidel iteration strategy and the incompatibility of degrees of freedom between FEs and DEs can be effectively addressed. Two numerical examples are employed for validation and the effectiveness of the proposed approach is also demonstrated via comparison with other numerical methods.

Coupled Discrete Element/Finite Element Method for the Analysis of Large Reinforced Concrete Structures Submitted to an Impact

2011 ◽  
Vol 82 ◽  
pp. 284-289
Author(s):  
Laurent Daudeville ◽  
Jessica Haelewyn ◽  
Philippe Marin ◽  
Serguei Potapov
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Heterogeneous Media ◽  
Concrete Slab ◽  
Element Model ◽  
Discrete Element ◽  
Discrete Elements ◽  
Reinforced Concrete Slab ◽  
The Impact ◽  
Element Method

The efficiency of the discrete element method for studying the fracture of heterogeneous media has been demonstrated, but it is limited by the size of the computational model. A coupling between the discrete elements (DEM) and the finite elements (FEM) methods is proposed to handle the simulation of impacts on large structures. The structure is split into two subdomains in each of which the method is adapted to the behavior of the structure under impact. The DEM takes naturally into account the discontinuities and is used to model the media in the impact zone. The remaining structure is modeled by the FEM. We propose an adaptation of the coupling procedure to connect Discrete Element model to shell-type Finite Elements. Finally, the efficiency of this approach is shown on the simulation of a reinforced concrete slab impacted by a tubular impactor.

scholarly journals Dental Pulp Regeneration: Insights from Biological Processes

2017 ◽  
Vol 20 (1) ◽  
pp. 10-16
Author(s):  
Cristina Retana-Lobo DDS, MSD
Keyword(s):  
Tissue Engineering ◽  
Dental Pulp ◽  
Short Review ◽  
Biological Processes ◽  
Pulp Tissue ◽  
Pulp Regeneration ◽  
Dental Tissues ◽  
Current State ◽  
Signaling Mechanisms ◽  
Dental Pulp Tissue

One of the major approaches on dentistry research in this century is the development of biological strategies (tissue engineering) to regenerate/ biomineralize lost dental tissues. During dentin-pulp regeneration, the interaction between stem cells, signaling molecules, biomaterials and the microenvironment in the periapical area drives the process for dental pulp tissue engineering.  Understanding the signaling mechanisms and interactions involved with the biological process for the formation of a new tissue, is essential. The knowledge of the micro-environment is the key for the application of tissue engineering.  The present article is a short review of the current state of this topic, with the purpose of showing insights of pulp regeneration.

scholarly journals Dental Pulp Regeneration: Insights from Biological Processes

2017 ◽  
Vol 20 (1) ◽  
pp. 10-16
Author(s):  
Cristina Retana-Lobo DDS, MSD
Keyword(s):  
Tissue Engineering ◽  
Dental Pulp ◽  
Short Review ◽  
Biological Processes ◽  
Pulp Tissue ◽  
Pulp Regeneration ◽  
Dental Tissues ◽  
Current State ◽  
Signaling Mechanisms ◽  
Dental Pulp Tissue

One of the major approaches on dentistry research in this century is the development of biological strategies (tissue engineering) to regenerate/ biomineralize lost dental tissues. During dentin-pulp regeneration, the interaction between stem cells, signaling molecules, biomaterials and the microenvironment in the periapical area drives the process for dental pulp tissue engineering.  Understanding the signaling mechanisms and interactions involved with the biological process for the formation of a new tissue, is essential. The knowledge of the micro-environment is the key for the application of tissue engineering.  The present article is a short review of the current state of this topic, with the purpose of showing insights of pulp regeneration.

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