Search results for "Grit"

Impact of Superfinish Turning on Surface Integrity of Pure Copper

2011

Abstract The presented study deals with comprehension of relationships between machining cutting conditions and physical-chemical properties linked with surface integrity. A multi-physics model is presented to calculate residual stress, temperature and dislocation fields in the machined material. This model includes both thermal-mechanical, structural evolution and dynamic recristallisation approaches. The model was applied to pure copper after superfinish turning. Good agreement was found between numerical values and experimental ones. This paper also presents a work on the impact of mechanical and microstructural changes induced by machining on the electrochemical behaviour and corrosion …

A physical-based constitutive model for surface integrity prediction in machining of OFHC copper

2017

International audience; Due to the rising interest in predicting machined surface integrity and sustainability, various models for metal cutting simulation have been developed. However, their accuracy depends deeply on the physical description of the machining process. This study aims to develop an orthogonal cutting model for surface integrity prediction, which includes a physical-based constitutive model of Oxygen Free High Conductivity (OFHC) copper. This constitutive model incorporates the effects of the state of stress and microstructure on the work material behavior, as well as a dislocation density-based model for surface integrity prediction. The coefficients of the constitutive mod…

Influence of cutting process mechanics on surface integrity and electrochemical behavior of OFHC copper

2014

The authors gratefully acknowledge the support received from IC ARTS and CEA Valduc; International audience; Superfinishing machining has a particular impact on cutting mechanics, surface integrity and local electrochemical behavior. In fact, material removal during this process induces geometrical, mechanical and micro-structural modifications in the machined surface and sub-surface. However, a conventional 3D cutting process is still complex to study in terms of analytical/numerical modeling and experimental process monitoring. So, researchers are wondering if a less intricate configuration such as orthogonal cutting would be able to provide information about surface integrity as close as…

Orthogonal cutting simulation of OFHC copper using a new constitutive model considering the state of stress and the microstructure effects

2016

International audience; This work aims to develop an orthogonal cutting model for surface integrity prediction, which incorporates a new constitutive model of Oxygen Free High Conductivity (OFHC) copper. It accounts for the effects of the state of stress on the flow stress evolution up to fracture. Moreover, since surface integrity parameters are sensitive to the microstructure of the work material, this constitutive model highlights also the recrystallization effects on the flow stress. Orthogonal cutting model is validated using experimental designed cutting tests. More accurate predictions were obtained using this new constitutive model comparing to the classical Johnson-Cook model.

Le rêve européen dans la littérature négro-africaine d'expression française

2015

The followers of the Negritude accustomed us to the confrontation between Africa and Europe through the staging of a character-dreaming of Europe with stereotyped images of France conveyed by the colonial school-who is confronted with the conditions of exile during his stay in Europe and the remoteness of motherland which bears all his aspirations. But for the writers of Migritude, emigration to Europe takes a different turn; it is no longer motivated by a desire for discovery but an escape from the native land which has become repulsive, while Europe is in the eyes of migrants, an attractive place embellished by the stories of immigrants who, have already made the journey. The present rese…

Is there a need for more effective quality awards for agritourisms?

2010

Tantalo e la ricerca dello spazio-tempo perduto: riflessioni a margine della tutela cautelare nel processo amministrativo e di altri demoni

2020

The paper pays attention to the concrete dynamics inside the precautionary phase of the administrative trial

Validation of the Grit Scale and the Treatment Self-Regulation Questionnaire (TSRQ) in the Mexican context

2019

espanolResumen La ausencia de instrumentos validos para medir variables relacionadas con las conductas saludables en Mexico, nos lleva al objetivo de adaptar y validar al idioma espanol hablado en Mexico la escala Grit y el cuestionario de autorregulacion del tratamiento (TSRQ) de la dieta, y explorar la relacion entre el Grit y la motivacion hacia la alimentacion saludable como evidencia de validez. 353 adultos del estado de Nuevo Leon respondieron a la escala Grit adaptada al espanol conformada por 12 items distribuidos en dos factores (consistencia del interes y perseverancia del esfuerzo) y al TSRQ adaptada al espanol compuesto por 15 items en tres factores (motivacion autonoma, motivac…

Sustainable tourism in the rural areas of a Southern Italian region

2012

In the last few years, a significant interest has been observed about all the possible ways rural tourism is carried out, but especially concerning agritourism, which represents the main specific application. Rural tourism is a form of sustainable tourism since its pillar is constituted by both valorisation and conservation of the environmental and territorial situation where economic activity is carried out in tune with identity and culture of local communities. From the official statistical data, it brings out the fact that this economic activity, widely spread in the Italian territory, may provide a significant financial support both to agricultural firms and to the whole economic sector…

Sustainable tourisme in the rural areas of a southern Italian region

2012

In the last few years, a significant interest has been observed about all the possible ways rural tourism is carried out, but especially concerning agritourism, which represents the main specific application. Rural tourism is a form of sustainable tourism since its pillar is constituted by both valorisation and conservation of the environmental and territorial situation where economic activity is carried out in tune with identity and culture of local communities. From the official statistical data, it brings out the fact that this economic activity, widely spread in the Italian territory, may provide a significant financial support both to agricultural firms and to the whole economic sector…