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Register a new userA New Method For Evaluating Limiting Drawing Ratio Considering the Fracture Criteria During the Deep Drawing of Cylindrical Cup
إيجاد معادلة لحساب نسبة السحب الحدية بالاعتماد على معيار الانهيار خلال عملية السحب العميق لكأس اسطواني
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شذا محرز( باحث )
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في هذا البحث سنقدم طريقة تحليلية لحساب نسبة السحب الحدية LDR من أجل عملية السحب العميق لكأس اسطواني مع اعتبار إن السحب يتم على مرحلة واحدة . ستتضمن هذه الطريقة دراسة تأثير بارامترات عملية السحب العميق على نسبة السحب الحدية مثل قوة القمط و معامل الاحتكاك و معامل التصلد الانفعالي و نسبة الانفعال اللدن .
In this paper an improved analytical method for estimating the limiting drawing ratio (LDR) for deep drawing of cylindrical cup (the first drawing stage) is presented . In this method, the effects of parameters such as blank holder force , coefficient of friction, strain hardening exponent, normal plastic anisotropy ratio on LDR is investigated .
References used
Leu,D 1999 The limiting drawing ratio for plastic instability of the cup-drawing process, Journal of Materials Processing Technology, 168-176
Verma,R and Chandra,S 2006 An improved model for predicting limiting drawing ratio, Journal of Materials Processing Technology, 218-224
Fazli,A & Arezoo,B 2012 Prediction of limiting drawing ratio considering the effective parameters of die arc region, Journal of Materials Processing Technology, Vol. 4 , 745-751
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The Special Drawing Rights (SDR) is an innovative system made by the
International Monetary Fund. It was coined to resolve the problem of the lack of
liquidity that faced by the international community in the late sixties of the twentieth
century.
The system of SDR was executed with the First Amendment to the Agreement of the
International Monetary Fund in 1969, although of the International dispute
regarding many topics, Such as the enclosure of SDR as a key component inside the
international monetary system, the legal nature of SDR, and the size and the role
that it should take.
Three versions of the SDRs have been produced. The latest and largest one was 161.2
billion units, which is equivalent to 250 billion USD, to be added to the earlier
smaller versions.
This study addresses the SDR through few points:
The first one deals with the concept of SDR and the origin of its inception. The
second focuses on its legal nature, and obligations of its users. The third point deals
with the mechanism of the allocation of SDR. The fourth addresses the reality of the
SDR, and the difference between its system and the system which is based on the
dollar. The fifth and last point looks at amending the SDR system, and providing
possible scenarios for its future role. ...
دراسة عملية السحب العميق وتحديد البارامترات التي تؤثر في عملية السحب وتؤدي إلى حدوث تشققات وعيوب في العينات
The copper wire drawing is one of cold forming operations which
basicly the copper is used as pure material for various diameters &
sections in electrical conductors industry.
By cooperation with S.M.C company for cables industry in
Damascus – Sy
ria, a research has been done during 2 years on rod
breakdown heavy drawing machine -HENRICH - GERMANY- 2
lines- with max productivity 25 ton/24hr.
50 samples of copper wire breaks and deformations have been
studied & analyzed, thus the defects are classified in main statistics
diagrams in gold of give main instructions that contribute in raising
the quality level of local copper wire manufacturing & giving a
whole view about this industry.
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including the turbulent wake behind a twisted overhead
transmission line in comparison to the wake behind a cylindrical
transmission line. The study showed the effect of the shape of
the
twisted transmitter on the slow pattern and the boundary layer
separation and the shape of the wake. A difference was noted
between the two transmitters and especially the pressure distribution
and the resulting force. The study also dealt with the noise caused
by the flow; the twisted transmitter showed higher sound pressure
levels SPL compared to the cylindrical transmitter. This is due to
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