Pankaj V. Katariya, Subrata Kumar Panda and Trupti Ranjan Mahapatra
The purpose of this paper is to develop a general mathematical model for the evaluation of the bending and vibration responses of the skew sandwich composite plate using…
Abstract
Purpose
The purpose of this paper is to develop a general mathematical model for the evaluation of the bending and vibration responses of the skew sandwich composite plate using higher-order shear deformation theory. The sandwich structural components are highly preferable in modern engineering application because of their desirable structural advantages despite the manufacturing and analysis complexities. The present model is developed to solve the bending and vibration problem of the skew sandwich composite plate with adequate accuracy numerically in the absence of the experimental analysis.
Design/methodology/approach
The skew sandwich composite plate structure is modelled in the present analysis by considering laminated face sheet in conjunction with isotropic and/or orthotropic core numerically with the help of the higher-order mathematical model. Further, the responses are computed numerically with the help of in-house computer code developed in matrix laboratory (MATLAB) environment in conjunction with finite element (FE) steps. The system governing equations are derived via variational technique for the computation of the static and the frequency responses.
Findings
The skew sandwich composite plate is investigated using the higher-order kinematic model where the transverse displacement through the thickness is considered to be linear. The convergence and the validation study of the bending and the frequency values of the sandwich structure indicate the necessary accuracy. Further, the current model has been used to highlight the applicability of the higher-order kinematics for the evaluation of the sandwich structural responses (frequency and static deflections) for different design parameters.
Originality/value
In the present paper, the bending and the vibration responses of the skew sandwich composite plate are analysed numerically using the equivalent single-layer higher-order kinematic theory for the isotropic and the orthotropic core numerically with the help of isoparametric FE steps. Finally, it is understood that the present model is capable of solving the sandwich structural responses with less computation cost and adequate accuracy.
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Kulmani Mehar and Subrata Kumar Panda
The purpose of this paper is to develop a general mathematical model for the evaluation of the theoretical flexural responses of the functionally graded carbon nanotube-reinforced…
Abstract
Purpose
The purpose of this paper is to develop a general mathematical model for the evaluation of the theoretical flexural responses of the functionally graded carbon nanotube-reinforced composite doubly curved shell panel using higher-order shear deformation theory with thermal load. It is well-known that functionally graded materials are a multidimensional problem, and the present numerical model is also capable of solving the flexural behaviour of different shell panel made up of carbon nanotube-reinforced composite with adequate accuracy in the absence of experimentation.
Design/methodology/approach
In this current paper, the responses of the single-walled carbon nanotube-reinforced composite panel is computed numerically using the proposed generalised higher-order mathematical model through a homemade computer code developed in MATLAB. The desired flexural responses are computed numerically using the variational method.
Findings
The validity and the convergence behaviour of the present higher-order model indicate the necessity for the analysis of multidimensional structure under the combined loading condition. The effect of various design parameters on the flexural behaviour of functionally graded carbon nanotube doubly curved shell panel are examined to highlight the applicability of the presently proposed higher-order model under thermal environment.
Originality/value
In this paper, for the first time, the static behaviour of functionally graded carbon nanotube-reinforced composite doubly curved shell panel is analysed using higher-order shear deformation theory. The properties of carbon nanotube and the matrix material are considered to be temperature dependent. The present model is so general that it is capable of solving various geometries from single curve to doubly curved panel, including the flat panel.
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Trupti Ranjan Mahapatra, Vishesh Ranjan Kar and Subrata Kumar Panda
The purpose of this paper is to analyse the nonlinear flexural behaviour of laminated curved panel under uniformly distributed load. The study has been extended to analyse…
Abstract
Purpose
The purpose of this paper is to analyse the nonlinear flexural behaviour of laminated curved panel under uniformly distributed load. The study has been extended to analyse different types of shell panels by employing the newly developed nonlinear mathematical model.
Design/methodology/approach
The authors have developed a novel nonlinear mathematical model based on the higher order shear deformation theory for laminated curved panel by taking the geometric nonlinearity in Green-Lagrange sense. In addition to that all the nonlinear higher order terms are considered in the present formulation for more accurate prediction of the flexural behaviour of laminated panels. The sets of nonlinear governing equations are obtained using variational principle and discretised using nonlinear finite element steps. Finally, the nonlinear responses are computed through the direct iterative method for shell panels of various geometries (spherical/cylindrical/hyperboloid/elliptical).
Findings
The importance of the present numerical model for small strain large deformation problems has been demonstrated through the convergence and the comparison studies. The results give insight into the laminated composite panel behaviour under mechanical loading and their deformation behaviour. The effects of different design parameters and the shell geometries on the flexural responses of the laminated curved structures are analysed in detailed. It is also observed that the present numerical model are realistic in nature as compared to other available mathematical model for the nonlinear analysis of the laminated structure.
Originality/value
A novel nonlinear mathematical model is developed first time to address the severe geometrical nonlinearity for curved laminated structures. The outcome from this paper can be utilized for the design of the laminated structures under real life circumstances.
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Pankaj V Katariya and Subrata Kumar Panda
The purpose of this paper is to develop a general mathematical model for laminated curved structure of different geometries using higher-order shear deformation theory to evaluate…
Abstract
Purpose
The purpose of this paper is to develop a general mathematical model for laminated curved structure of different geometries using higher-order shear deformation theory to evaluate in-plane and out of plane shear stress and strains correctly. Subsequently, the model has to be validated by comparing the responses with developed simulation model (ANSYS) as well as available published literature. It is also proposed to analyse thermal buckling load parameter of laminated structures using Green–Lagrange type non-linear strains for excess thermal distortion under uniform temperature loading.
Design/methodology/approach
Laminated structures known for their flexibility as compared to conventional material and the deformation behaviour are greatly affected due to combined thermal/aerodynamic environment. The vibration/buckling behaviour of shell structures are very different than that of the plate structures due to their curvature effect. To model the exact behaviour of laminated structures mathematically, a general mathematical model is developed for laminated shell geometries. The responses are evaluated numerically using a finite element model-based computer code developed in MATLAB environment. Subsequently, a simulation model has been developed in ANSYS using ANSYS parametric design language code to evaluate the responses.
Findings
Vibration and thermal buckling responses of laminated composite curved panels have been obtained based on proposed model through a customised computer code in MATLAB environment and ANSYS simulation model using ANSYS parametric design language code. The convergence behaviour are tested and compared with those available in published literature and ANSYS results. Finally, the investigation has been extended to examine the effect of different parameters (thickness ratios, curvature ratios, modular ratios, number of layers and support conditions) on the free vibration and thermal buckling responses of laminated curved structures.
Practical implications
The present paper intends to give sufficient amount of numerical experimentation, which may lead to help in designing of finished product made up of laminated composites. Most of the aerospace, space research and defence organisation intend to develop low cost and high durable products for real hazard conditions by taking combined loading and environmental conditions. Further, case studies might lead to a lighter design of the laminated composite panels used in high-performance systems, where the weight reduction is the major parameter, such as aerospace, space craft and missile structures.
Originality/value
In this analysis, the geometrical distortion due to temperature is being introduced through Green–Lagrange sense in the framework of higher-order shear deformation theory for different types of laminated shells (cylindrical/spherical/hyperboloid/elliptical). A simulation-based model is developed using ANSYS parametric design language in ANSYS environment for different geometries and loading condition and compared with the numerical model.
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Shiv Shankar Kumar, Kumar Sanjay Sawarni, Subrata Roy and Naresh G
The objective of this paper is to investigate the effect of working capital efficiency (WCE) and its components on the composite financial performance of a sample of Indian firms.
Abstract
Purpose
The objective of this paper is to investigate the effect of working capital efficiency (WCE) and its components on the composite financial performance of a sample of Indian firms.
Design/methodology/approach
Our sample includes 796 non-financial listed firms from 2015–16 to 2021–22. Sample firms’ profitability, liquidity, solvency, cash flow management, and financial and operational leverage have been used to classify them into companies with high composite financial performance (HCFP) and with low composite financial performance (LCFP) by using K-Means Clustering technique. A composite financial performance score (CFPS) of 1 has been assigned to HCFP and 0 to LCFP. We have used logistic regression models with fixed effect to estimate the effect of cash conversion cycle (CCC) and its components, i.e. inventory days, accounts receivable days and accounts payable days on CFPS in the presence of control variables such as growth, leverage, firm size, and age.
Findings
The study finds that CCC and inventory days are inversely associated with CFPS. This finding shows that the firms’ WCE leads to superior financial performance on a composite basis.
Research limitations/implications
The research findings are based on samples drawn from the population of the listed Indian non-financial companies. Since the operation, financial practices, working capital policies, and management styles of firms vary greatly among nations, the results of this study should be extended to firms in other countries after taking into account the degree of resemblance to the sample firms.
Practical implications
The findings of this study hold significant value for industry practitioners, as they provide guidance in determining the optimal allocation of funds for working capital and devising strategies for effectively managing inventory levels, credit sales, and vendor payments in order to increase the overall value of the company. This study aims to help investors in building their investment portfolios by identifying companies with superior composite financial performance. Investors can enhance the construction of their investment portfolios by strategically selecting companies that demonstrate superior overall performance.
Social implications
The results of our study will help companies improve their WCM strategies to enhance their overall value, and their significance increases manifold during economic downturns. Business firms that perform well by efficiently managing their working capital have a multiplier effect on the economy and society at large in the form of GDP contribution, labor income, taxes to the government, investment in capital assets, and payments to suppliers.
Originality/value
To understand the impact of WCE on firms’ performance, the extant working capital literature focuses on some specific characteristics such as profitability, valuation, solvency, and liquidity. The limitation of employing a single parameter is its inability to present the comprehensive performance evaluation of firms. This study is among the earliest studies that focus on the holistic evaluation of WCE's impact on the composite performance of a company.
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Arunava Dalal, Subhajit Bhattacharya and Subrata Chattopadhyay
The handicraft sector is unorganized, with tremendous opportunities for generating employment, particularly for the non-urban and bottom of the pyramid (BOP) population. The aim…
Abstract
Purpose
The handicraft sector is unorganized, with tremendous opportunities for generating employment, particularly for the non-urban and bottom of the pyramid (BOP) population. The aim of this paper is to revisit the existing supply chain of the handicraft sector to identify the gaps that can help generate better marketing outcomes for the sector when addressed.
Design/methodology/approach
A mixed method of qualitative and quantitative research has been used. Empirical observations from artisans have been collected to identify different variables impacting the functioning of the handicraft value chain.
Findings
Different variables were identified and grouped into six important dimensions through the mixed-method research. The components were ranked based on importance, which can help in developing a robust supply chain at BOP for the handicraft sector.
Originality/value
Studies on the supply chain of the handicraft sector are rare, and none has tried to understand issues in an integrated way directly from the artisans. This study has captured the voices of the artisans, and through qualitative and quantitative data analyses, the main reasons for the artisans' pain points were identified. This can give directions to a viable business model for the handicraft sector.
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Subhajit Bhattacharya and Subrata Chattopadhyay
The various learning outcomes of the case include the following: to provide information and help the students to understand how a start-up business succeeds with the proper…
Abstract
Learning outcomes
The various learning outcomes of the case include the following: to provide information and help the students to understand how a start-up business succeeds with the proper branding and marketing; to help understand different marketing theories related to segmentation, targeting, positioning, branding, distribution and marketing process and the frameworks of understanding start-up business marketing with a practical example; to improve analytical skills and help evaluate marketing strategies related to segmentation, targeting, positioning, branding, distribution and marketing in the Indian quick-service restaurant (QSR) business; and to encourage learners to think differently towards solution generation and strategy decisions.
Case overview/Synopsis
The case portrays the dilemmas related to segmentation, targeting, brand positioning, distribution and start-up business marketing in the context of an Indian QSR. The present case strives to portray the journey of WoW! Momo is a QSR brand in India and highlights the company's branding and marketing challenges. Based on the challenges faced by the company and the decision dilemma pointed out in the case, the readers can get sufficient motivation to generate probable solutions. This was early 2007; Binod Kumar Homagai and Sagar Daryani, bosom friends, were on the verge of finishing their graduate studies in commerce from St. Xavier's College Kolkata. Pursuing Chartered Accountancy or MBA was the common trend as the career option among most commerce graduates then. Still, both Homagai and Daryani thought to be innovative and different in their career options. After a series of discussions, they determined to start with their favorite dish, momos, as an alternative brand proposition that would be opening off from the City of Joy, Kolkata. They managed to arrange a seed capital of INR 30,000 in 2008 and started their venture WoW! Momo. In the financial year 2018–2019, the company's revenue had already crossed INR 1170m, achieved its presence in 11 cities in India, and reached more than 243 outlets. This case has followed the qualitative research methods where in-depth interviews of the founders and stakeholders along with the observation method were used. The case unfolds a systematic solution of dilemmas related to segmentation, targeting, brand positioning, distribution and start-up business marketing in the context of Indian QSR business. This case can also be seen as one of the youth entrepreneurial success stories of Indians.
Complexity academic level
This case is primarily meant for second-year students in a postgraduate program in business management. The case could also be discussed in an executive development program on marketing/brand management/business strategy.
Supplementary materials
Teaching notes are available for educators only.
Subject code
CSS 8: Marketing.
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Sani Majumder, Izabela Nielsen, Susanta Maity and Subrata Saha
This paper aims to analyze the potentials of dynamic, commitment and revenue-sharing contracts; that a nonrebate offering manufacturer can use to safeguard his profit while his…
Abstract
Purpose
This paper aims to analyze the potentials of dynamic, commitment and revenue-sharing contracts; that a nonrebate offering manufacturer can use to safeguard his profit while his competitor offers customer rebates in a supply chain consisting of two manufacturers and a common retailer.
Design/methodology/approach
We consider a two-period supply chain model to explore optimal decisions under eight possible scenarios based on the contract and rebate offering decisions. Because the manufacturers are selling substitutable products, therefore, a customer rebate on one of the products negatively impacts the selling quantity of other. Optimal price, rebate, and quantities are examined and compared to explore the strategic choice for both the rebate offering and non-rebate offering manufacturer. Comparative evaluation is conducted to pinpoint how the parameters such as contract parameters and its nature affect the members.
Findings
The results demonstrate that all these contracts instigate the rebate offering manufacturer to provide a higher rebate, but do not ensure a higher profit. If the revenue sharing contract is offered to the common retailer, the effectiveness of the rebate program might reduce significantly, and the rebate offering manufacturer might receives lower profits. A non-rebate offering manufacturer might use a commitment contract to ensure higher profits for all the members and make sure the common retailer continues the product.
Originality/value
The effect of customer rebate vs. supply chain contract under competition has not yet been explored comprehensively. Therefore, the study contributes to the literature regarding interplay among pricing decision, contract choice and rebate promotion in a two-period setting. The conceptual and managerial insights contribute to a better understanding of strategic decision-making for both competing manufacturers under consumer rebates.