نتایج جستجو برای: improvement of formability

تعداد نتایج: 21177662  

2005
Eiji NAKAMACHI

A crystallographic homogenization procedure is introduced to the conventional static-explicit and dynamic-explicit finite element formulation to develop a multi scale – double scale – analysis code to predict the plastic strain induced texture evolution, yield loci and formability of sheet metal. The double-scale structure consists of a crystal aggregation – micro-structure and a macroscopic el...

Journal: :Materials transactions 2023

To improve the stretch flange deformation limit of ultrahigh-strength steels, a partial edge heating method was investigated. The effect strain gradient on when applied investigated by hole expansion test and FEM analysis. formability improved application because recovery shearing microstructure reduction hardness difference microstructure. It found that improvement for with depends region. In ...

2010
S. Allaoui A. Wendling D. Soulat

In order to understand the mechanisms involved in the forming step of LCM processes and provide validation data to numerical models, a specific experimental device has been designed in collaboration between PRISME Institute and EADS. This toot also makes it possible to test the feasibility to obtain specific double curved shape constituted with dry fabric reinforcement. It contains one mechanic...

2017
Gérald Franz Farid Abed-Meraim Marcel Berveiller Farid ABED-MERAIM Marcel BERVEILLER Gérald FRANZ

In this paper, we performed a strain localization analysis for single crystals and polycrystals, with the specific aim of establishing a link between the microstructure-related parameters and ductility. To this end, advanced large-strain elastic–plastic single crystal constitutive modeling is adopted, accounting for the key physical mechanisms that are relevant at the microscale, such as disloc...

2017
J. A. Jensen L. Scott Chumbley

Deformation-processed metal-metal composites (DMMC) of Mg-Li alloys containing steel reinforcing fibers were prepared by infiltrating a preform of steel wool with the molten matrix. The Li content was varied to control the crystal structure of the matrix; Mg-4 wt pct Li is hexagonal close packed (hcp), while Mg-12 wt pct Li is body-centered cubic (bcc). The low carbon steel used as the reinforc...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و علوم انسانی دکتر علی شریعتی 1389

the purpose of this study is to investigate the relationships between teachers’ immediacy behaviors and iranian students’ willingness to talk in english classes. analysis of the results from willingness to talk scale represents a relatively high level of willingness to talk in english classrooms among iranian language learners. the total mean score of students’ willingness to talk was 66.3 ou...

Journal: :International journal of manufacturing, materials, and mechanical engineering 2022

Single point incremental sheet metal forming has passed through a period of ample improvement with developing responsiveness from research societies and industries globally. The process expressively spared the practice using costly dies, which makes it an appropriate for manufacturing prototypes small batch production. It also discovers easiness in fabricating components timeworn equipment. Add...

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