Asokendu Samanta

Asokendu Samanta
Indian Register of Shipping · Department of Structure, Research Division

B.E, M.E, PhD, Post-Doc(UK), Exe-MBA, C.Eng.

About

49
Publications
63,635
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301
Citations
Citations since 2017
1 Research Item
103 Citations
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Publications

Publications (49)
Conference Paper
Full-text available
The application of nonlinear pile – soil interaction (PSI) in the evaluation of global response of offshore structures has been presented in this paper. In the case of onshore structures, coupled substructure and superstructure analysis is usually not preferred since the loads are not high enough to generate substantial effect in the foundation. Ho...
Article
For ships operating in combat situations, estimating the response of the bottom and side shells subjected to non-contact underwater blast load is of paramount importance. The damage severity in underwater explosion (UNDEX) depends not only on the shock factor but also on the type of fluid behind the structure (air or water). The response of a free-...
Poster
Effect of Underwater blast load on ship structural component
Technical Report
This report of the current committee describes the recent activities of the international ship and offshore industry and the researchers that support it, with specific regard to current pertinent issues and trends relating to Fatigue and Fracture. It is important to remember that the subject area is vast and developing rapidly, and that this report...
Conference Paper
Full-text available
The structural components of a warship can be subjected to the threat of underwater explosion caused by the sudden impact of a torpedo or mine placed well below the free water surface. The present study has been carried out to understand the effects of underwater explosion on an air-backed and a water-backed plate. Using commercial software package...
Conference Paper
The underwater explosion (UNDEX) causes serious damage to the naval structure (such as a ship or submarine). The damage caused by it to nearby ship structure can be both local and global in nature. When the shock wave hits the ship’s hull, it causes significant plastic deformation and rupture. Bubble pulse further contributes to the damage caused b...
Technical Report
Committee Mandate - Concern for crack initiation and growth under cyclic loading as well as unstable crack propagation and tearing in ship and offshore structures. Due attention shall be paid to practical application and statistical description of fracture control methods in design, fabrication and service. Consideration is to be given to the suita...
Chapter
Committee Mandate: Concern for crack initiation and growth under cyclic loading as well as unstable crack propagation and tearing in ship and offshore structures. Due attention shall be paid to practical application and statistical description of fracture control methods in design, fabrication and service. Consideration is to be given to the suitab...
Technical Report
Full-text available
Indian Register of Shipping (IRS) (Fig. 1) is an internationally recognized independent ship classification society, founded in India in 1975. It is an associate member of the International Association of Classification Societies (IACS). IRS is a non-profit making organization. It has a Committee of Management with representatives from the Ministry...
Technical Report
Full-text available
National City's [Fig. 1] corporate histories date to the mid-19th century, when National City was founded as the City Bank of Cleveland in 1845. The bank received national charters under the National Banking Act, and was able to print U.S. currency until the United States Treasury assumed operations in the 1920s. The bank had strong bases in its ho...
Conference Paper
SN curves are generally prepared for a unidirectional stress state. But, in practice the welded joints are subjected to combined normal and shear stresses. Therefore, it is essential to provide guideline on how to calculate fatigue life when combined normal and shear stresses are present. In the present paper a new approach based on the resultant o...
Conference Paper
Fatigue analysis of welded joints based on the Hot spot stress approach is emerging as a popular method in the industry. In the hot spot stress method, the stresses are obtained from FE analysis and the corresponding hot spot SN curves are used. These SN curves are generally prepared for a unidirectional stress state. But, in practice the welded jo...
Technical Report
Full-text available
A consumer’s purchasing decision process is quite difficult to fully understand and measure. Nonetheless, many research efforts have been carried out to determine the person that makes the decisions in the household. Marketers place a huge importance in determining the family purchasing agents. By doing so, they are able to develop effective, to-th...
Technical Report
Full-text available
Until middle of 2007, yen carry trade was one of the lucrative options to the traders. Not only American dollar (USD) was high in terms of Japanese yen (JPY) during that time (June 18, 2007, 1 USD = 123.87 JPY) (see Fig 1), but significant differences of interest rates between US treasury and borrowing rate of Japan prompted traders to borrow Japan...
Conference Paper
Efforts are being made in academia and ship-building industry to reduce the time spent on total ship building. Ship design is one of the phases of ship building which consumes considerable time. This paper aims at proposing a methodology for developing software for carrying out scantling calculations based on the class society rules using various p...
Technical Report
Go-to-market systems, with multiple marketing channels that link suppliers with their customers, have radically evolved beyond simple advertising or salesperson marketing channels. The present report discusses on the sales and distribution management of Bayer Crop Science Limited, who has been producing various products in the filed of crop protect...
Technical Report
Full-text available
Go-to-market systems, with multiple marketing channels that link suppliers with their customers, have radically evolved beyond simple advertising or salesperson marketing channels. The present report discusses on the sales and distribution management of Bayer Crop Science Limited, who has been producing various products in the filed of crop protect...
Technical Report
Full-text available
Canon, one of the most trusted brands in the world of photography and digital camera (consumer electronics good sector), has maintained its brand image for decades. Though, originally founded in Tokyo, Japan in 1937, it has opened its subsidiary in India in 1997 as Canon India Private Limited. Canon has several products, namely copier, projector, p...
Technical Report
Full-text available
Bharat Forge Limited (BFL), one of the world's largest forging companies is based in Pune, India and has nine manufacturing plants in India, Germany, Sweden, United States, Scotland, United Kingdom and mainland China. The flagship company of the USD 2.4 billion Kalyani Group was founded by Indian billionaire Baba Kalyani in 1961 and is listed both...
Technical Report
Full-text available
Time is Money. With the advent of new technology, a revolutionary change is occurred in the watch market of India. Previously only a few brands were ruling the market. However with the passage of time and with the opening of free trade, there is no dearth of various national and international brands in the market. A few years ago, people used to bu...
Technical Report
Full-text available
Effects of excessive fuel price rise in 2008 (Fig. 1) and falling rupees (in terms of US$) (Fig. 2), created a major imbalance between supply and demand in Indian airline industries in recent years. Due to these external factors, Indian airline industries, an oligopoly market, had to increase airfares in many folds and some low cost carriers (LCC)...
Article
Full-text available
This paper presents analysis of composite vessel using finite element tool Ansys 11.0. Ansys has a set of elements to deal with composite sandwich structures. However, they have some limitations. The applicability of these elements is discussed in this paper. For this purpose a houseboat of sandwich construction has been considered as a case study....
Conference Paper
Full-text available
The prediction of fatigue life of the welded joints is becoming inevitable task for the ship designers to avoid catastrophic failures. In general five stages of work is involved in the fatigue life assessment of any ship structure namely load calculation, nominal and hot spot stress computation, long-term stress distribution, selection of S-N curve...
Conference Paper
Full-text available
Prediction of stress concentration is becoming inevitable task as the finite element method emerges out in the field of fatigue analysis. Stress concentration can be determined either by empirical formulae or by finite element analysis. Submodeling is one of the well established techniques in finite element analysis to compute the stress concentrat...
Conference Paper
Fatigue is a phenomenon, which needs to be considered in the present day’s vessel design. The welded joints are particularly affected by the fatigue damage due to high stress concentrations caused by the metallurgical discontinuities present in the weld. For oil tankers and bulk carriers adequate guidelines for the fatigue strength assessment have...
Conference Paper
Full-text available
DKT (Discrete Kirchhoff Triangle) element being very much efficient, has been used effectively for the analysis of various plate/shell structures. But mostly all the previously published papers involving this element are related to linear static, buckling, vibration and nonlinear static analyses. In this paper a step forward is taken and nonlinear...
Conference Paper
Full-text available
The paper presents a finite element formulation of rectangular plates to evaluate the postbuckling behavior under constant edge displacement loading. Eight noded isoparametric quadratic plate-bending element and Mindlin’s hypothesis are used to formulate the plate. The analysis is based on displacement incremental Newton-Raphson method. A computer...
Conference Paper
Full-text available
A simplified method is developed to assess the fatigue life of single hull tanker. The accumulated fatigue damage under time varying loading is estimated based on the S-N curve approach assuming linear cumulative damage. A simplified formula is developed to calculate the relative deflection between frames, which is needed for local stress calculati...
Article
A coupled finite element model is developed to analyse the thermo-mechanical behaviour of a widely used polymer composite panel subject to high temperatures at service conditions. Thermo-chemical and thermo-mechanical models of previous researchers have been extended to study the thermo-chemical decomposition, internal heat and mass transfer, defor...
Article
The paper presents the development of a new stiffened shell element and subsequent application of this element in determining natural frequencies and mode shapes of the different stiffened structures. In the present method each stiffener is treated as a discrete one. The stiffener is modelled in such a way that it can be placed anywhere within the...
Article
Full-text available
In this paper, the recent trends in ship structural and hydrodynamic analyses have been discussed which includes: (i) the dynamic and long term analysis of a mini bulk carrier using a new stiffened plate element - the element can accommodate any number of arbitrarily oriented stiffeners and provides a very economic global analysis of the complete s...
Article
Full-text available
Stiffened plates are widely used in various engineering structures and they may have openings to provide accessibility to the other structures, cables etc. Determining the natural frequencies of these kinds of structures can be an important factor for design. Solving these types of structures by analytical procedure is very difficult when the stiff...
Conference Paper
Full-text available
Geometric nonlinear transient dynamic response analysis of stiffened plate has been done by the finite element method. A new stiffened plate element has been developed for this purpose. The element is a combination of Allman's plane stress triangle and discrete Kirchhoff triangle (DKT) plate bending element. The formulation of the stiffener has bee...
Article
Full-text available
As per the current standards for design of marine windows and scuttles the thickness of glass panels is determined on the basis of a static design pressure. The actual pressure acting on the panel is caused by wave action and is dynamic in nature. The present study has been done taking into account the transient type of pressure due to wave action....
Article
Full-text available
Comparison of nonlinear frequencies by two different approaches of large amplitude free vibration analysis of unstiffened and stiffened plates has been done. The nonlinear frequencies have been determined on the basis of the finite element method. A stiffened plate element has been developed for this purpose. The comparison has been done by employi...
Article
Geometric nonlinear static analysis of shallow and deep stiffened shells has been conducted on the basis of a combination of Allman's plane stress triangle and Discrete Kirchhoff triangle (DKT) plate bending element. The compatibility condition at the shell beam junction is ensured as the same displacement function used for both the shell and the s...
Article
Nonlinear geometric analysis of trapezoidal corrugated sheet is reported for the first time. In addition to three-dimensional analysis, an equivalent orthotropic model is proposed that includes both extensional and bending rigidities—a consideration not made earlier. The analysis is extended to the determination of free vibration characteristics of...
Conference Paper
Geometric nonlinear static analysis of stiffened plates has been analysed on the basis of a combination of Allman's plane stress triangle and DKT plate bending element, The compatibility condition at the shell beam junction is ensured as the same displacement function is used for both the shell and the stiffener element, The formulation of the stif...
Thesis
Full-text available
In various engineering structures thin plates and shells have extensive use. The stiffening of the plates and shells is often done in various ways to achieve greater strength with relatively less amount of material. This fulfils the purpose of the minimum weight of the structure. Besides, the appearance is frequently enhanced as a bonus. A distinct...
Article
A conveyor belt is often analyzed for free vibration by considering a panel of it that may yield results that are misleading. To improve on the existing practice, an analysis has been carried out by treating the complete belt as a folded plate. For these belts, high tension is induced, and the belts vibrate in a flexural mode. A discrete Kirchhoff...
Conference Paper
Full-text available
Bulkheads are transverse stiffening members of a ship. They are basically a plate structure stiffened by closely spaced transverse and vertical stiffeners: In stead of using stiffened panels corrugated shells may be used as bulkhead in order to reduce lightweight of the hull. The corrugated bulkhead is studied in this paper by the finite element an...
Article
Analysis of buckling of fully or partially embedded compression members is done by finite element technique. The mode shapes corresponding to the critical loads are also determined. The basic beam finite element is used for this purpose. The determination of the critical load is an eigen value problem and this eigen value problem is solved by matri...
Conference Paper
Full-text available
The finite clement method is used to determine the natural frequencies and mode shapes of thin closed stiffened circular cylindrical shells. An arbitrary stiffened triangular shallow shell element which is a combination of DKT plate bending element and Allman's plane stress triangle developed earlier has been used. Each stiffener is treated as a di...

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Project (1)
Archived project
For ships operating in combat situations, estimating the response of the bottom and side shells subjected to non-contact underwater blast load is of paramount importance. The damage severity in underwater explosion (UNDEX) depends not only on the shock factor but also on the type of fluid behind the structure (air or water). The response of a free-standing air-backed (AB) and water-backed (WB) plate has already been studied analytically by Liu and Young . However, analysis for AB or WB conditions for fixed flexible plate structures has not been given due importance. In the present study, the equation of motion for the generalized single degree of freedom (SDOF) model for AB orWBplate, which accounts for its flexibility, is formulated from the principle of virtual work. However, since this model is constructed to have a global overview of the present problem without taking account of its inherent complexities, a detailed numerical investigation using MSC.DYTRAN solver is carried out for bare and stiffened plates. The results obtained from both the analytical model and numerical simulations clearly show significant reduction in displacement in case of WB condition compared to AB condition for equal shock factors. This study emphasizes the fact that WB condition can be used to our advantage in order to reduce damage associated with UNDEX in case of doublebottom or double-hull naval vessels.