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Inner harbour wave agitation using boussinesq wave model
Panigrahi, Jitendra K.,Padhy, C.P.,Murty, A.S.N. The Society of Naval Architects of Korea 2015 International Journal of Naval Architecture and Oc Vol.7 No.1
Short crested waves play an important role for planning and design of harbours. In this context a numerical simulation is carried out to evaluate wave tranquility inside a real harbour located in east coast of India. The annual offshore wave climate proximity to harbour site is established using Wave Model (WAM) hindcast wave data. The deep water waves are transformed to harbour front using a Near Shore spectral Wave model (NSW). A directional analysis is carried out to determine the probable incident wave directions towards the harbour. Most critical threshold wave height and wave period is chosen for normal operating conditions using exceedence probability analysis. Irregular random waves from various directions are generated confirming to Pierson Moskowitz spectrum at 20m water depth. Wave incident into inner harbor through harbor entrance is performed using Boussinesq Wave model (BW). Wave disturbance experienced inside the harbour and at various berths are analysed. The paper discusses the progresses took place in short wave modeling and it demonstrates application of wave climate for the evaluation of harbor tranquility using various types of wave models.
Microindentation fracture behavior of surface modified alumina ceramic using glass infiltration
Balakrishnan, A.,Panigrahi, B.B.,Chu, M.C.,Kim, T.N.,Cho, S.J. Elsevier 2009 Journal of materials processing technology Vol.209 No.4
This study investigates the effect of a low expansion glass (Mg<SUB>3</SUB>Al<SUB>2</SUB>Si<SUB>6</SUB>O<SUB>18</SUB>) treatment on the surface fracture toughness of sintered alumina. The surface fracture toughness was determined by direct indentation method (Vickers indentations), carried out at different loads ranging from 9.8 to 196N. The crack lengths on the surface at each load were found to be decreased (8-12%) by glass treatment and the corresponding crack resistance values increased by about 17-20%. Both sintered and glass treated specimens showed rising trend in crack resistance values as the indentation load was increased. There was also a significant increase in the Weibull modulus value of crack resistance. Improved properties of glass treated sample were attributed to the formation of a relatively larger process zone surrounding the crack, crack arrest behavior due to the compressive stresses and the crack bridging phenomena. The compressive stresses were generated from the thermo-elastic properties mismatch: (a) between the glass and the ceramic in the glass infiltrated zone, and (b) the glass-ceramic composite layer and the ceramic substrate.
Inner harbour wave agitation using boussinesq wave model
Jitendra K. Panigrahi,C.P. Padhy,A.S.N. Murty 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.1
Short crested waves play an important role for planning and design of harbours. In this context a numerical simulation is carried out to evaluate wave tranquility inside a real harbour located in east coast of India. The annual offshore wave climate proximity to harbour site is established using Wave Model (WAM) hindcast wave data. The deep water waves are transformed to harbour front using a Near Shore spectral Wave model (NSW). A directional analysis is carried out to determine the probable incident wave directions towards the harbour. Most critical threshold wave height and wave period is chosen for normal operating conditions using exceedence probability analysis. Irregular random waves from various directions are generated confirming to Pierson Moskowitz spectrum at 20m water depth. Wave incident into inner harbor through harbor entrance is performed using Boussinesq Wave model (BW). Wave disturbance experienced inside the harbour and at various berths are analysed. The paper discusses the progresses took place in short wave modeling and it demonstrates application of wave climate for the evaluation of harbor tranquility using various types of wave models.
Strengthening of alumina by a low thermal expansion glass at surface
Chu, M.C.,Panigrahi, B.B.,Balakrishnan, A.,Cho, S.J.,Yoon, K.J.,Kim, T.N.,Lee, K.H. Elsevier Sequoia 2007 Materials science & engineering. properties, micro Vol.452 No.-
A low thermal expansion glass was melted on the sintered alumina. The molten glass penetrated into the surface region of the alumina along the grain boundaries. Thermal and elastic properties mismatch between the glass-penetrated surface region and the interior of alumina produced residual compression in the surface region during cooling. The glass penetration improved the strength by about 53% and also there was a significantly improvement in the thermal shock resistance of the alumina. The observed enhancement in the strength was found to be almost equal to the residual stress generated as a result of thermal and elastic properties mismatch.