Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Chemical bonded resin sand mould system has high dimensional accuracy, surface finish and sand mould properties compared to green

sand mould system. The mould cavity prepared under chemical bonded sand mould system must produce sufficient permeability and

hardness to withstand sand drop while pouring molten metal through ladle. The demand for improved values of permeability and mould

hardness depends on systematic study and analysis of influencing variables namely grain fineness number, setting time, percent of resin

and hardener. Try-error experiment methods and analysis were considered impractical in actual foundry practice due to the associated cost.

Experimental matrices of central composite design allow conducting minimum experiments that provide complete insight of the process.

Statistical significance of influencing variables and their interaction were determined to control the process. Analysis of variance

(ANOVA) test was conducted to validate the model statistically. Mathematical equation was derived separately for mould hardness and

permeability, which are expressed as a non-linear function of input variables based on the collected experimental input-output data. The

developed model prediction accuracy for practical usefulness was tested with 10 random experimental conditions. The decision variables

for higher mould hardness and permeability were determined using desirability function approach. The prediction results were found to be

consistent with experimental values.

Go to article

Authors and Affiliations

M.G.C. Patel
M.B. Parappagoudar
G.R. Chate
A.S. Deshpande
Download PDF Download RIS Download Bibtex

Abstract

The dry sliding wear behavior of heat-treated super duplex stainless steel AISI 2507 was examined by taking pin-on-disc type of wear-test

rig. Independent parameters, namely applied load, sliding distance, and sliding speed, influence mainly the wear rate of super duplex

stainless steel. The said material was heat treated to a temperature of 850°C for 1 hour followed by water quenching. The heat treatment

was carried out to precipitate the secondary sigma phase formation. Experiments were conducted to study the influence of independent

parameters set at three factor levels using the L27 orthogonal array of the Taguchi experimental design on the wear rate. Statistical

significance of both individual and combined factor effects was determined for specific wear rate. Surface plots were drawn to explain the

behavior of independent variables on the measured wear rate. Statistically, the models were validated using the analysis of variance test.

Multiple non-linear regression equations were derived for wear rate expressed as non-linear functions of independent variables. Further,

the prediction accuracy of the developed regression equation was tested with the actual experiments. The independent parameters

responsible for the desired minimum wear rate were determined by using the desirability function approach. The worn-out surface

characteristics obtained for the minimum wear rate was examined using the scanning electron microscope. The desired smooth surface was

obtained for the determined optimal condition by desirability function approach.

Go to article

Authors and Affiliations

M. Davanageri
S. Narendranath
R. Kadoli
Download PDF Download RIS Download Bibtex

Abstract

A novel methodology was implemented in the present study to concurrently control power conversion efficiency (η) and durability (D) of co-sensitized dye solar cells. Applying response surface methodology (RSM) and Desirability Function (DF), the main influential assembling (dye volume ratio and anti-aggregation agent concentration) and operational (performance temperature) parameters were systematically changed to probe their main and interactive effects on the η and D responses. Individual optimization based on RSM elucidated that D can be solely controlled by changing the ratio of vat-based organic photosensitizers, whereas η takes both effects of dye volume ratio and anti-aggregation concentration into account. Among the studied factors, the performance temperature played the most vital role in η and D regulation. In particular, however, multi-objective optimization by DF explored the degree to which one should be careful about manipulation of assembling and operational parameters in the way maximization of performance of a co-sensitized dye solar cell.

Go to article

Authors and Affiliations

M. Hosseinnezhad
A. Shadman
M. Reza Saeb
Y. Mohammadi
Download PDF Download RIS Download Bibtex

Abstract

In this investigation, high specific strength precipitation hardenable alloy AA7068-T6 was joined using friction stir welding. Experiments were carried out using the three factor-three level central composite face-centered design of response surface methodology. Regression models were developed to assess the influence of tool rotational speed, welding speed, and axial force on ultimate tensile strength and elongation of the fabricated joints. The validity of the developed models was tested using the analysis of variance (ANOVA), actual and adjusted values of the regression coefficients, and experimental trials. The analysis of the developed models together with microstructural studies of typical cases showed that the tool rotational speed and welding speed have a significant interaction effect on the tensile strength and elongation of the joints. However, the axial force has a relatively low interaction effect with tool rotational speed and welding speed on the strength and elongation of the joints. The process variables were optimized using the desirability function analysis. The optimized values of joint tensile strength and elongation – 516 MPa and 21.57%, respectively were obtained at a tool rotational speed of 1218 rpm, welding speed of 47 mm/ min, and an axial force of 5.3 kN.
Go to article

Bibliography

  1.  A.M. Khalil, I.S. Loginova, A.V. Pozdniakov, A.O. Mosleh, and A.N. Solonin, “Evaluation of the Microstructure and Mechanical Properties of a New Modified Cast and Laser-Melted AA7075 Alloy,” Materials, vol. 12, no. 20, 2019. [Online]. Available: https://www.mdpi. com/1996-1944/12/20/3430.
  2.  M. Minnicino, D. Gray, and P. Moy, “Aluminum alloy 7068 mechanical characterization,” Army Research Lab Aberdeen Proving Ground MD Weapons and Materials Research, Tech. Rep., 2009.
  3.  R.S. Mishra and Z. Ma, “Friction stir welding and processing,” Mater. Sci. Eng., R, vol. 50, no. 1‒2, pp. 1–78, 2005.
  4.  M. Mohammadi-pour, A. Khodabandeh, S. Mohammadipour, and M. Paidar, “Microstructure and mechanical properties of joints welded by friction-stir welding in aluminum alloy 7075-T6 plates for aerospace application,” Rare Met., pp. 1–9, 2016.
  5.  P. Goel, A.N. Siddiquee, N.Z. Khan, M.A. Hussain, Z.A. Khan, M.H. Abidi, and A. Al-Ahmari, “Investigation on the effect of tool pin profiles on mechanical and microstructural properties of friction stir butt and scarf welded aluminium alloy 6063,” Metals, vol. 8, no. 1, p. 74, 2018.
  6.  N. Martinez, N. Kumar, R. Mishra, and K. Doherty, “Effect of tool dimensions and parameters on the microstructure of friction stir welded aluminum 7449 alloy of various thicknesses,” Mater. Sci. Eng. A, vol. 684, pp. 470–479, 2017.
  7.  W. Xu, H. Wang, Y. Luo, W. Li, and M. Fu, “Mechanical behavior of 7085-T7452 aluminum alloy thick plate joint produced by double- sided friction stir welding: Effect of welding parameters and strain rates,” J. Manuf. Processes, vol. 35, pp. 261–270, 2018.
  8.  M. Mehta, A. Arora, A. De, and T. DebRoy, “Tool geometry for friction stir welding – optimum shoulder diameter,” Metall. Mater. Trans. A, vol. 42, no. 9, pp. 2716–2722, 2011.
  9.  M. Jayaraman, R. Sivasubramanian, V. Balasubramanian, and A. Lakshminarayanan, “Application of RSM and ANN to predict the tensile strength of Friction StirWelded A319 cast aluminium alloy,” Int. J. Manuf. Res., vol. 4, no. 3, pp. 306–323, 2009.
  10.  S. Jannet, P. Mathews, and R. Raja, “Comparative investigation of friction stir welding and fusion welding of 6061 T6-5083 O aluminum alloy based on mechanical properties and microstructure,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 62, no. 4, 2014.
  11.  K. Deepandurai and R. Parameshwaran, “Multiresponse optimization of FSW parameters for cast AA7075/SiCp composite,” Mater. Manuf. Processes, vol. 31, no. 10, pp. 1333–1341, 2016.
  12.  M.M. Krishnan, J. Maniraj, R. Deepak, and K. Anganan, “Prediction of optimum welding parameters for FSW of aluminium alloys AA6063 and A319 using RSM and ANN,” Mater. Today: Proc., vol. 5, no. 1, pp. 716–723, 2018.
  13.  M. Vahdati, M. Moradi, and M. Shamsborhan, “Modeling and Optimization of the Yield Strength and Tensile Strength of Al7075 Butt Joint Produced by FSW and SFSW Using RSM and Desirability Function Method,” Trans. Indian Inst. Met., vol. 73, no. 10, pp. 2587–2600, 2020.
  14.  G. Derringer and R. Suich, “Simultaneous optimization of several response variables,” J. Qual. Technol., vol. 12, no. 4, pp. 214–219, 1980.
  15.  G. Kumar, R. Kumar, and R. Kumar, “Optimization of process parameters of friction stir welded AA5082- AA7075 butt joints using resonance fatigue properties,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 68, no. 1, 2020, doi: 10.24425/bpasts.2020.131830.
  16.  A.R. Rose, K. Manisekar, and V. Balasubramanian, “Effect of axial force on microstructure and tensile properties of friction stir welded AZ61A magnesium alloy,” Trans. Nonferrous Met. Soc. China, vol. 21, no. 5, pp. 974–984, 2011.
  17.  K. Jata, K. Sankaran, and J. Ruschau, “Friction-stir welding effects on microstructure and fatigue of aluminum alloy 7050-T7451,” Metall. Mater. Trans. A, vol. 31, no. 9, pp. 2181–2192, 2000.
  18.  F. Viana, A. Pinto, H. Santos, and A. Lopes, “Retrogression and re-ageing of 7075 aluminium alloy: microstructural characterization,” J. Mater. Process. Technol., vol. 92, pp. 54–59, 1999.
  19.  D. Godard, P. Archambault, E. Aeby-Gautier, and G. Lapasset, “Precipitation sequences during quenching of the AA 7010 alloy,” Acta Mater., vol. 50, no. 9, pp. 2319– 2329, 2002.
  20.  A.P. Reynolds, W. Tang, Z. Khandkar, J.A. Khan, and K. Lindner, “Relationships between weld parameters, hardness distribution and temperature history in alloy 7050 friction stir welds,” Sci. Technol. Weld. Joining, vol. 10, no. 2, pp. 190–199, 2005.
  21.  V.S. Gadakh and K. Adepu, “Heat generation model for taper cylindrical pin profile in fsw,” J. Mater. Res. Technol., vol. 2, no. 4, pp. 370–375, 2013.
  22.  K.K. Ramachandran, N. Murugan, and S.S. Kumar, “Performance analysis of dissimilar friction stir welded aluminium alloy AA5052 and HSLA steel butt joints using response surface method,” Int. J. Adv. Manuf. Technol, vol. 86, no. 9, pp. 2373–2392, 2016.
Go to article

Authors and Affiliations

M.D. Bindu
1
P.S. Tide
1
A.B. Bhasi
1
K.K. Ramachandran
2

  1. Division of Mechanical Engineering, Cochin University of Science and Technology, Kerala, India
  2. Department of Mechanical Engineering, Government Engineering College, Trissur, Kerala, India

This page uses 'cookies'. Learn more