iosr-JMCE   Volume-4 ~ Issue-3

Abstract: In this work, fault detection in a single cracked beam has been worked out. The identification of location and the depth of crack in a beam containing single transverse crack is done through theoretical and experimental analysis respectively. It has come to noticed that a crack in a beam has great effect on dynamic behavior of beam. The strain energy density function also applied to examine the few more flexibility produced to because of the presence of crack. Considering the flexibility an additional stiffness matrix is taken away and consequently, it is used to find the natural frequency and mode shape of the cracked beam of different end conditions of beam. The difference of mode shapes of cantilever beam, simply supported beam and Clamped – Clamped beam in between the first three modes of cracked and un-cracked respectively beam with its amplified view at the zone of the crack locale are studied. The theoretical analyses are carried out of the crack structure. Finally for the validation result are compared with the results of both theoretical and experimental analysis. It is found that the contract agreed between their results is excellent.
Keywords:beam, crack, fault, frequency, locale, mode shape, stiffness matrix, vibration.

[1]. Al-Said and SamerMasoud, 'Crack identification in a stepped beam carrying a rigid disc' , journal of sound and vibration, 300 (3-
5), p. 863-876, March, 2007.
[2]. Andreaus, Ugo and Baragatti, Paolo, 'Cracked beam identification by numerically analyzing the nonlinear behavior of the
harmonically forced response', Journal of sounds and vibrations, 330(4), p. 721-742, Feb. 2011.
[3]. Bachschmid,N. Tanzi, E. and Audebert, S. 'The effect of helicoidal cracks on the behavior of rotating shafts', Journal of
engineering fracture mechanics,75(3-4), p. 475-488, Feb. 2008.
[4]. Boonya, Prapasorn and Arsit, 'Fault detection and diagnosis process for cracked rotor vibration systems using model based
approach', PhD Thesis, Jan. 2009.
[5]. Chondros, T. G. and Labeas, G. N, 'Torsional vibration of a cracked rod by vibrational formulation and numerical analysis',
Journal of sound and vibration, 301(3-5), p.994-1006, April, 2007.
[6]. Chondros, T. G. 'Fatigue fracture of the Bjork-Shiley heart valve strut and failure diagnosis from acoustic signature', Journal of
theoretical and applied fracture mechanics, 54(2), p. 71-81, Oct. 2010.
[7]. Darpe, Ashish K., 'A novel way to detect transverse surface crack in a rotating shaft', Journal of sound and vibration, 305(1-2), p.
151-171, Aug. 2007.
[8]. Das, H. C., and Parhi, D. R., 'Identification of crack location and intensity in a cracked beam by fuzzy reasoning', International
journal of intelligent systems Technology and applications, vol.9, No.1, p. 75-95, 2010.
[9]. El-OuafiBahlous, S., Smaoui, H., and El-Borgi, S., 'Experimental validation of an ambient vibration based multiple damage
identification method using statistical modal filtering', Journal of sound and vibration, 325(1-2), p. 49-68, Aug.2009.
[10]. Faverjon, B. and Sinou, J. J., 'Identification of an open crack in a beam using an a posteriori error estimator of the frequency
response functions with noisy measurement', European journal of mechanics-A/Solids, 28(1), p.75-85, Jan. 2009.

Abstract: The offshore tubular structures are composed of beam elements which the intersecting areas present structural discontinuities. So, a high stress concentration appears in these areas, particularly, in the hot spots points. In this study, the finite element method (FEM) is applied on welded tubular T, Y, DT and DY-joints, in order to visualise the elastic stress distribution in the vicinity of the weld toe, and record the plastic limit load of each form. The aim of this work is to compare the elastic and elastoplastic behaviours, firstly, between T and Y tubular join, then, repeated this study for DT and DY joints. For elastic study, the evolution of von Mises equivalent stress along the weld toe was compared, knowing that the axial loads are applied in the free ends of the all braces. For nonlinear investigation, a comparison of tensile loads limits (collapse load) of these joints was realised, knowing that a tensile proportionally load is applied in the free ands of the braces. The mesh and the numerical calculation are performed using, respectively, Patran and Nastran software.
Keywords:Elastic, Elastoplastic, Stress Factor Concentration, Tubular Joint, Hot Spot, Limit Load.

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Nonferrous Metal Society of China, 16(s1), 2006, s1-s10.
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Structures, 27(3), 2005, 421-430.
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tubulaire soudé de forme « T », 4th Int. Symposium Aircraft Material, Fès Morocco, 2012.
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Abstract: The overall objective of this paper is to design and analyze a composite drive shaft for power transmission applications. A one-piece drive shaft for rear wheel drive automobile was designed optimally using E-Glass/Epoxy and High modulus (HM) Carbon/Epoxy composites. In this paper an Analytical and ANSYS Software has been successfully applied to minimize the weight of shaft which is subjected to the constraints such as torque transmission, Static Structural capacities. The results of Analytical Analysis are used to perform Torsional Buckling analysis using ANSYS software. The results show the stacking sequence and fiber angle orientation of shaft strongly affects Buckling strength of shaft.

[1] M.A. Badie, E. Mahdi , A.M.S. Hamouda, "An investigation into hybrid carbon /glass fiber reinforced epoxy composite automotiv e
drive shaft", Materials and Design 32 (2011), pp 1485–1500.
[2] Mahmood M. Shokrieh, Akbar Hasani, Larry B. Lessard, "Shear buckling of a composite drive shaft under torsion", Composite
Structures 64 (2004), pp 63–69. 3. S.A. Mutasher , "Prediction of the torsional strength of the hybrid aluminum/composite drive
shaft", Materials and Design 30 (2009), pp 215–220.
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Technology 68 (2008), pp 337–345. 5. Y.A. Khalid, S.A. Mutasher, B.B. Sahari, A.M.S. Hamouda, "Bending fatigue behavior of
hybrid aluminum/composite drive shafts", Materials and Design 28 (2007), pp 329–334.
[4] Hak Sung Kim, Dai Gil Lee, "Optimal design of the press fit joint for a hybrid aluminum/composite drive shaft", Composite
Structures 70 (2005), pp 33–47.
[5] A.R. Abu Talib, Aidy Ali, Mohamed A. Badie, Nur Azida Che Lah, A.F. Golestaneh, "Developing a hybrid, carbon/glass fiber -
reinforced, epoxy composite automotive drive shaft", Materials and Design 31 (2010), pp 514–521.
[6] M. A. Badie, A. Mahdi, A. R. Abutalib, E. J. Abdullah and R. Yonus, " Automotive Composite Drive Shafts Investigation of the
Design Variable Effects", IJET Vol. 3, No.2, 2006, pp. 227 -237 .
[7] Nitin Gokhale, Sanjay Deshpande, Anand Thite, Practical Finite Element Analysis, Finite to Infinite, India.
[8] Y. Nakasone, S. YoshimotoT., A. Stolarski, Engineering Analysis With ANSYS Software, First edition 2006, Elsevier Butterworth-
Heinemann Publication.
[9] Thimmegowda RANGASWAMY, Sabapathy VIJAYARANGAN "Optimal Sizing and Stacking Sequence of Composite Shaft",
ISSN 1392-1320, Vol.11 No.2 2005, pp 133-140.
[10] T.Rangaswamy, S. Vijayarangan, R.A. Chandrashekar, T.K. Venkatesh and K.Anantharaman, "Optimal Design and Analysis of
Automotive Composite Drive Shaft", ISRS on Material Science Engineering, December 2002-04, pp 1-9. shaft", Composite

Abstract: The increase demand for LNG as alternative of conventional oil fuel and due to the risk assessment of LNG tank . The increase of focus has been put on the performance of welded LNG tank . Where the improvement of 9%Ni steel plates mechanical properties is still continued by steel making to reduce the cost of fabrication of LNG storage tank and to give more safe structure. These applied by development of heat treatment process that change from quenched till reach to double quenched and tempered . The problem in welded joint is to be more match to mechanical properties of base metal especially with no facility of applying PWHT process .
Keywords:9%Ni steel plate ,LNG tank , Heat Input ,Toughness ,Tensile strength

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steel plates for liquefied natural tanks " , Kawasaki steel technical report No. 6 , September 1982.
[2] Manabu HOSHINO, Naoki SAITOH,Hirohide MURAOKA& Osamu SAEKI ," Development of Super-9%Ni Steel Plates with
Superior Low-Temperature Toughness for LNG Storage Tanks " , NIPPON STEEL TECHNICAL REPORT No. 90 July 2004 .
[3] Jörgen Strömberg ,Susan Sun-Hi Pak , Cost efficient LNG storage tank constructed by High productivity welding , ESAB ,PO-30..
[4] Jang-Bog Ju, Woo-sik Kim, Jae-il Jang, , Variations in DBTT and CTOD within weld heat-affected zone of API X65 pipeline
steel, journal of Materials Science and Engineering A , 2012.
[5] LEI Ming ,Guo Yunyi," Formation of precipitated austenite in 9%Ni steel and it s performance at cryogenic temperature ",ACTA
Metallurgica sinica (english edition) ,Series A,Vol 2 No. 4 pp-244-248 , Jul 1989.
[6] K,Hickmann, A.Kern, U. Schriever and J.Stumpfe , "Production and properties of high strength nickel alloy steel plates for low
temperature applications ",2005.
[7] NISHIDA Shun-ichi, MATSUOKA Toshio & WADA Tsunemi" Technology and Products of JFE Steel's Three Plate Mills",JFE
TECHNICAL REPORT No. 5 , Mar. 2005LEI
[8] C.K.Syn, B.Fultz and J.W.Morris ," Mechanical stability of retained austenite in tempered 9Ni steel",ASM ans The Metallurgical
society of AIME ,Vol 9A,Nov 1978-1635.
[9] S O H K I T A, Control of Strength and toughness in weld metals, Welding International 2003 17 (9) 693–698.
[10] C. Thaulowa,*, M. Haugea, Z.L. Zhanga, é. Ranestada, F. Fattorini , On the interrelationship between fracture toughness and
material mismatch for cracks located at the fusion line of weldments , Engineering Fracture Mechanics 64 (1999) 367±382.