نتایج جستجو برای: spring back

تعداد نتایج: 206981  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز 1381

‏‎the community dynamics of aquatic coleoptera(insecta)in one of the spring-stream habitats of bammo national park in fars province called cheshmeh-ye-ghanbari is studied as a pilot project and model for acquaintance with and furthering the biodiversity studies on fauna of iran. sixteen species-populations out of nineteen of this community were already identified for their taxonomy and for thei...

Journal: :نشریه دانشکده فنی 0
محمد حبیبی پارسا محمد کاظمی محمد حسن پیش بین

spring back is responsible for inaccuracy of press formed sheet product. therefore, prediction of spring back is important for precise forming of stampings. to predict the amount of spring back many successful attempts have been made for simple cases such as single curved and u or v shape sheet metals. however, for more complex shapes containing double curves or double variable curved surfaces ...

Journal: :تحقیقات مکانیک کاربردی 0

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Journal: :international journal of advanced design and manufacturing technology 0
mehdi vahdati department of mechanical engineering, university of tehran ramezanali mahdavinejad department of mechanical engineering, university of tehran saeid amini department of mechanical engineering, university of kashan

ultrasonic vibration assisted single point incremental forming (uvaspif) process is an attractive and adaptive method in which a sheet metal is gradually and locally formed by a vibrating hemispherical-head tool. the ultrasonic excitation of forming tool reduces the average of vertical component of forming force and spring-back rate of the formed sample. the spring-back phenomenon is one of the...

2015
Shaojuan Su Yong Hu Wang C. Fang

The accurate prediction of the spring back has great significance to the cold bending of plates. Based on the analysis of the square non pressure head CNC bending machine forming principle, the finite element model of the cold forming of the hull plate surface was established using the ANSYS/LS-DYNA finite element software. And the spring back computing research was done on the thickness of 8 m...

Journal: :Developmental Cell 2002

2007
Vanchai Laemlaksakul Sompoap Talabgaew

This research studied the appropriate factors and conditions for laminated bamboo bending by Design of Experiments (DOE). The interested factors affecting the spring back in laminates bamboo were (1) time, (2) thickness, and (3) frequency. This experiment tested the specimen by using high frequency machine and measured its spring back immediately and next 24 hours for comparing the spring back ...

2014
Takashi Sakai

Abstract—Using a texture database, a statistical estimation of spring-back was conducted in this study on the basis of statistical analysis. Both spring-back in bending deformation and experimental data related to the crystal orientation show significant dispersion. Therefore, a probabilistic statistical approach was established for the proper quantification of these values. Correlation was exa...

Journal: :تحقیقات مکانیک کاربردی 0

0

Journal: :journal of computational applied mechanics 0
hosein mohammadi ms graduate, department of mechanical engineering, university of tehran, tehran, iran masoud sharififar department of metallurgy and material engineering, malek-ashtar university of technology, tehran, iran ali asghar ataee assistant professor, school of mechanical engineering, university of tehran, tehran, iran

the incremental sheet metal forming (ismf) process is a new and flexible method that is well suited for small batch production or prototyping. this paper studies the use of the finite element method in the incremental forming process of aa1050 sheets to investigate the influence of tool diameter, vertical step size, and friction coefficient on forming force, spring-back, and thickness distribut...

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