Current Advances in Mechanical Design and Production III. by Salah E. A. Bayoumi, S. E. A. Bayoumi, M. Y. A. Younan

By Salah E. A. Bayoumi, S. E. A. Bayoumi, M. Y. A. Younan

Presents an up to date account of contemporary developments, innovations and case reports within the very important fields of research and layout of mechanical platforms and elements, creation know-how and commercial engineering. subject matters lined comprise fail secure and tension research, dynamic research and regulate, vibrations, fabrics expertise, production know-how and productiveness and computer-aided research of producing approaches. comprises fifty two papers.

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Additional resources for Current Advances in Mechanical Design and Production III. Proceedings of the Third Cairo University MDP Conference, Cairo, 28–30 December 1985

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Of the clad ding and fuel. Marco Spiga 43 Fig. , 5. Fig. 4 - Strain cladding distribution for various Fig. 5 - Equivalent stress distribution in the cladvalues of n (L e = L + n L). ding for various values of n (L = L + n L). 44 Marco Spiga ACKNOWLEDGEMENT This work was tinanciaily supportea by the Italian to P I . REFERENCES i SPIGA, M. , ana LORENZINI, E.. "Neutron Distribution lniiuence on the Thermal Design oi a Nuclear Fuel Rod", Nuci. Eng. , (60) No. 3, 353-363 ; (I9ö0). 2. , and SPIGA; Gv "Relationship between Nuclear and Thermomechanical Aspects in Fuel Rod Design".

Figure 6 compares the ratchet hoop strain observed in (Jorum's test with the IHj KH uniaxial and plane strain models generated in the present work. It is clearly seen that the test results are nearly bracketed by IH and KH generalized plane strain solutions with IH providing the upper limit and KH the lower limit. The corresponding uniaxial hardening solutions overestimate the observed strain by more than 100%. Also,the perfect plasticity model is seen to be extremely conservative. It should be noted that time-depenent creep strains which arise during hold periods are not considered here.

2. 33 (bilinear thermal gradient) Fig. 3. 5°C and h=0 (linear thermal gradient) Fig. k. 33. 'Cyclea Fig. 5. 8 MPa, T=75°C and h=0 Cycle Fig. 6. Comparison betweer* t e s t r e s u l t s and ΙΗ,ΚΗ. UM'S Teet Result· IH niaxial (a d- A . Megahed 36 A . Megahed CONCLUSIONS Generalized plane strain moael proviaes a reasonably accurate representation for the accumulation ot ratchet strain in thin-walled tubes subjectea to cyclic thermal graaient across its wail. Isotropie hardening ana kinematic hardening rules provide upper ana lower bounas tor the observea experimental ratchet strain.

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Current Advances in Mechanical Design and Production III. by Salah E. A. Bayoumi, S. E. A. Bayoumi, M. Y. A. Younan
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