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99 results on '"Durodola J"'

8. Comparative Study and Evaluation of Two Different Finite Element Models for Piston Design

Author

Adil, H., Gerguri, S., Durodola, J., Fellows, N., Bonatesta, F., and Audebert, Fernando Enrique

Subjects
Ingeniería Mecánica, Ansys, purl.org/becyt/ford/2 [https], Finite Element Analysis, purl.org/becyt/ford/2.3 [https], INGENIERÍAS Y TECNOLOGÍAS, Piston, Stress, Mecánica Aplicada
Abstract

The exposure of pistons to extreme mechanical and thermal loads in modern combustion engines has necessitated the use of efficient and detailed analysis methods to facilitate their design. The finite element analysis has become a standard design optimisation tool for this purpose. In literature two different approaches have been suggested for reducing the geometry of the cylinder and crank slider mechanism,to idealise piston finite element analysis load models,whilst trying to maintain realistic boundaries to obtain accurate results. The most widely used geometry is the combination of piston and gudgeon pin while the second geometry includes some portion of the connecting rod?s small end and cylinder in addition to the piston and gudgeon pin.No clear analyses have been made in literature about the relative effectiveness of the two approaches in terms of model accuracy. In this work both approaches have been carried out and analysed with respect to a racing piston. The results suggest that the latter approach is more representative of the load conditions that the piston is subjected to in reality. Fil: Adil, H.. Oxford Brookes University; Reino Unido Fil: Gerguri, S.. Oxford Brookes University; Reino Unido Fil: Durodola, J.. Oxford Brookes University; Reino Unido Fil: Fellows, N.. Oxford Brookes University; Reino Unido Fil: Bonatesta, F.. Oxford Brookes University; Reino Unido Fil: Audebert, Fernando Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long". Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long"; Argentina. Oxford Brookes University; Reino Unido

Published
2019

10. Modelling of adhesive bonded joints in vehicle substructures

Author

Steidler, S. M., Durodola, J., and Beevers, A.

Subjects
Adhesive joints -- Models, Adhesive joints -- Properties, Adhesive joints -- Analysis, Grilles -- Analysis, Engineering and manufacturing industries
Abstract

Byline: S. M. Steidler, J. Durodola, A. Beevers It is well established that adhesive bonded structures are stiffer than assemblies fabricated with fasteners or spot welds. The enhancement of stiffness obtained by adhesive bonding in car bodies can contribute to improved vehicle stability and passenger comfort and is a desirable design objective. However, the actual stiffness of bonded joints and their effectiveness on the behaviour of large structures are difficult to quantify as they depend on many variables. Finite element techniques have been applied to model typical joints for car bodies and to predict the stiffness when subjected to various loading conditions. These models have been used to explore effects of dimensions/geometry and adhesive properties on joint characteristics. A novel approach has been developed to enable the behaviour of joints to be translated into a full car body model. This technique, based on an undercut element concept, has been validated by experimental analysis and provides a more accurate estimate of full body behaviour. The results demonstrate the effectiveness of different adhesive joint features on body stiffness.

Published
2010

11. Functionally graded adhesive joints : a review and prospects

Author

Durodola, J and Durodola, J

Abstract

There is increasing demand for effective and efficient lightweight structures because of global environmental and resource sustainability concerns. Adhesive bonding has been adopted in many assembly arrangements because of its relative reduction of stress concentration in joints compared to mechanical fasteners. Functionally graded bonded joints presents even greater potentials for reduction of stress concentrations and the tailoring of stress distribution as may be desired in an adhesive layer. This capability provides opportunity for the design of high performance tailored structural assemblies. Although some encouraging analysis and experimental work have been carried out on the development of functionally graded joints, its wide application is still to be realised. This paper reviews the work that has been carried out so far on the method, in terms of analysis, fabrication, experimental testing and application. It also reflects on outstanding issues that need to be resolved in order for wider application to be feasible.

Published
2017

12. Development of numerical model for the determination of crack opening and closure loads, for long cracks

Author

Aguilar Espinosa, A, Fellows, N, Durodola, J, Fellows, L, Aguilar Espinosa, A, Fellows, N, Durodola, J, and Fellows, L

Abstract

​A two-dimensional Finite Element (FE) model has been developed for determining crack opening and closure stresses, with the eventual aim of investigating plasticity induced closure effects on crack growth under variable amplitude loading. An issue with model verification is obtaining accurate experimental values of crack opening and closure loads. Validation was therefore carried out using experimental data from constant amplitude loading tests, recently obtained by the authors1, 2 where there was good confidence in the accuracy of the opening and closing loads. Elastic-perfect plastic and work hardening material properties were investigated to determine the effect they had on crack growth. The modelling considered long cracks by dividing the crack into consecutive small lengths. For this purpose, the restart capability included in the ABAQUS code was employed. In addition, a mesh refinement strategy was optimised to reduce the memory requirements for the thousands of cycles analysed. This enabled both long crack lengths and small element sizes to be studied which has not been done in the literature before. The FE results were in good agreement with most of the experimental results and possible reasons are given for some of the minor discrepancies observed.

Published
2016

14. High-resolution non-destructive evaluation of defects using artificial neural networks and wavelets

Author

Farley, S, Durodola, J, Fellows, N, and Hernandez-Gomez, L

Abstract

This paper presents artificialneuralnetworks (ANN) and wavelet analysis as methods that can assist highresolutionof multiple defects in close proximity in components. Without careful attention to analysis, multiple defects can be mis-interpreted as single defects and with the possibility of significantly underestimated sizes. The analysis in this work focussed on A-scan type ultrasonic signal. Amplitudes corresponding to the sizes of two defects as well as the phase shift parameter representing the distance between them were determined. The results obtained demonstrate very good correlation for sizes and distances respectively even in cases involving noisy signal data

Published
2012

15. Development of numerical model for the determination of crack opening and closure loads, for long cracks.

Author

Aguilar Espinosa, A A, Fellows, N A, Durodola, J F, and Fellows, L J

Subjects
CRACK closure, FRACTURE mechanics, FINITE element method, MATERIAL plasticity, MECHANICAL loads
Abstract

A two-dimensional finite element (FE) model has been developed for determining crack opening and closure stresses, with the eventual aim of investigating plasticity induced closure effects on crack growth under variable amplitude loading. An issue with model verification is obtaining accurate experimental values of crack opening and closure loads. Validation was therefore carried out using experimental data from constant amplitude loading tests, recently obtained by the authors where there was good confidence in the accuracy of the opening and closing loads. Elastic-perfect plastic and work hardening material properties were investigated to determine the effect they had on crack growth. The modelling considered long cracks by dividing the crack into consecutive small lengths. For this purpose, the restart capability included in the ABAQUS code was employed. In addition, a mesh refinement strategy was optimised to reduce the memory requirements for the thousands of cycles analysed. This enabled both long crack lengths and small element sizes to be studied which has not been done in the literature before. The FE results were in good agreement with most of the experimental results, and possible reasons are given for some of the minor discrepancies observed. [ABSTRACT FROM AUTHOR]

Published
2017
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16. Light-weighting of automotive and aerospace transport

Author

Beavers, A, Oxford Brookes University, Hutchinson, A, Durodola, J, Morrey, D, Broughton, J, Fellows, N, Winfield, P, Beavers, A, Oxford Brookes University, Hutchinson, A, Durodola, J, Morrey, D, Broughton, J, Fellows, N, and Winfield, P

Abstract

The automotive and aerospace industries are keen to reduce their environmental impact and so have looked to move to lightweight materials. This creates issues in terms of joining, using and disposing of dissimilar materials. Oxford Brookes has therefore worked with national and multi-national companies in the adhesive, materials, automotive and aerospace industries to try to solve these problems. This has resulted in high quality research publications, innovative test equipment, improved numerical methods, novel designs, design guidelines, manufacturing procedures, British Standards, patents, commercial products and further funding. The impact of the work has global safety, environmental and economic benefits with multi-national aerospace and automotive companies implementing the results in current developments.

Published
2013

17. Failure prediction in carbon composites subjected to bearing versus bypass loading

Author

Rosales-Iriarte, F, Fellows, N, Durodola, J, Rosales-Iriarte, F, Fellows, N, and Durodola, J

Abstract

To lighten structures, many metallic components, such as aircraft wings, are being replaced by composite components. To join these components with the rest of the structure, various joining techniques are used. When using multiple bolted joints, bypass vs. bearing loading is developed around each joint. The ratio of bearing to bypass loading is known to affect the level of load at which failure occurs. There have been many models created to predict failure within composites but very little work has been carried out to investigate how well numerical models predict failure within bolted joints subjected to bearing and bypass loading. In addition, few models have been developed that account for the through thickness stresses that are developed underneath the bearing load. This paper compares a range of failure criteria and degradation models utilizing a three-dimensional model and compares how well they predict failure for bearing vs. bypass loading for a supported-pin-loaded joint.

Published
2012

31. The influence of the reaction heat-treatment process on the mechanical properties of multi-filamentary composite Nb3Sn superconducting wires at 77 and 300 K

Author

Harvey, D A, Fellows, N A, Durodola, J F, and Twin, A

Abstract

Stress-strain curves have been obtained for a 1.5 mm diameter bronze-process multi-filamentary composite Nb3Sn wire at 77 and 300 K. Tensile test specimens were prepared with a variety of heat-treatment conditions, ranging from no heat-treatment to one with a duration exceeding that of the wire manufacturer's recommended full heat-treatment. The results show that for each heat-treatment condition, the mechanical properties are significantly different at 77 and 300 K: at the lower temperature, specimens have higher proof stress, are stronger and more ductile. The elastic modulus is not significantly different at 77 and 300 K, but rises from 102 GPa for specimens that were not heat-treated to 110 GPa for fully reacted ones. The proof stress is significantly higher for specimens that were not heat-treated compared to those that were. This is true even for heat-treatment durations that were too short to convert much of the niobium into Nb3Sn. Extending the heat-treatment beyond these short durations, and thus increasing the Nb3Sn volume fraction, makes the wires more brittle. However, despite having a dramatic effect on the composition, extending the heat-treatment duration does not have much of an effect on the stress-strain curve up to the point of failure.

Published
2006
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33. Ultrasound induced fragmentation of primary Al3Zr crystals

Author

Priyadarshi Abhinav, Subroto Tungky, Conte Marcello, Prentice Paul, Pericleous Koulis, Eskin Dmitry, Durodola John, and Tzanakis Iakovos

Subjects
ultrasonic melt treatment, intermetallic crystal, high speed imaging, cavitation, fragmentation, deflection, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Ultrasonic cavitation melt treatment (UST) of aluminium alloys has received considerable attention in the metal industry due to its simple and effective processing response. The refined primary intermetallic phases formed in the treated alloys during controlled solidification, govern alloy structural and mechanical properties for applications in the automotive and aerospace industries. Since the UST is performed close to the liquidus temperatures of the alloys, understanding the refinement mechanism of the primary intermetallic phases has been beset by difficulties in imaging and handling of liquid metals. In this paper, the sonofragmentation behaviour of primary intermetallic Al3Zr crystals extracted from the matrix of an Al-3 wt% Zr alloy and fixed on a solid substrate was investigated. The intermetallics were exposed to cavitation action in deionized water at 24 kHz of ultrasound frequency. The fragmentation mechanism from the nearby collapsing cavitation bubbles was studied with in-situ high speed imaging. Results revealed that the main fragmentation mechanism is associated with the propagation of shock wave emissions from the collapsing bubble clouds in the vicinity of the crystal. The mechanical properties of the Al3Zr phase determined previously were used for the fracture analysis. It was found that an Al3Zr intermetallic undergoes low cycle fatigue fracture due to the continuous interaction with the shock wave pressure. The magnitude of the resulting shear stress that leads to intermetallic fragmentation was found to be in the range of 0.6 – 1 MPa.

Published
2020
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39. Pattern of Hemoglobin Concentration in Untreated Burkitt Lymphoma Patients in Ibadan

Author

Durodola, J. I.

Subjects
Hemoglobins, immune system diseases, hemic and lymphatic diseases, Original Communications, virus diseases, Humans, Nigeria, Anemia, Burkitt Lymphoma
Abstract

Hemoglobin concentration is studied in 128 untreated Burkitt lymphoma patients in Ibadan. While there is no significant diagnostic pattern in hemoglobin concentration, Burkitt lymphoma patients show marked anemia as compared with healthy adult Nigerians. The degree of involvement of malarial parasitemia in producing anemia in Burkitt lymphoma patients has yet to be determined.

Published
1979

41. Pattern of Leukocyte Counts in Untreated Burkitt's Lymphoma Patients in Ibadan

Author

Durodola, J. I.

Subjects
Adult, Male, Adolescent, Black People, Nigeria, Middle Aged, Burkitt Lymphoma, United States, Body Temperature, Leukocyte Count, Child, Preschool, Original Communications, Humans, Female, Uganda, Child
Abstract

Leukocyte counts and body temperature were studied in 232 untreated Burkitt's lymphoma patients. Differential counts were obtained in 153 of them. There was no significant diagnostic variation in circulating leukocyte levels and no correlation between the size, site, or stage of the tumour and leukocyte counts or body temperature. No explanation can be given for low neutrophils in 40 of the 153 patients whose differential counts were performed.

Published
1977

42. WCE 2010 - World Congress on Engineering 2010: Preface

Author

Korsunsky, A. M., Hunter, A., Hukins, D. W. L., Gelman, L., Hogger, C. J., Ceglarek, D. J., Payne, S., Ao, S. I., Ahmad, M., Alexandrou, I., Al-Nuaimy, W., Amavasai, B. P., An, Y. -Y, Ariwa, E., Arteche, J., Audrino, F., Ayesh, A., Baber, C., Bailey, C., Balkan, N., Barria, J., Bartosova, J., Benkrid, K., Bleijs, H., Bluck, M., Bose, I., Bouzas, P. R., Braiden, P. M., Brdys, M., Burriesci, G., Cannataro, M., Carvalho, A., Chang, C. -C, Chen, D., Chen, G. G., Chen, Y. -S, Chiclana, F., Cooke, A., Das, D. B., Davis, D. N., Dayoub, I., Raman, S. D. C. V., Demetriou, I. C., Devai, F., Dilmaghani, R. S., Dini, D., Drikakis, D., Durkan, C., Durodola, J., Etebar, K., Fenn, P., Figueiredo, A., Florou, G., Freear, S., Gabrys, B., Galbraith, G. H., Gaskell, P. H., Gaura, E., Ge, Z. -Q, Ghafouri-Shiraz, H., Ghavami, M., Giannopoulos, K., Pruneda Gonzalez, R. E., Gracia, A. M., Grecos, C., Guan, L., Gulpinar, N., Guo, R., Guo, Y., Hardalupas, Y., He, L., Herrero, J. R., Hicks, B. J., Hines, E. L., Hodgson, S., Horsfall, A., Hosein, P., Hu, F., Hu, O., Ijomah, W., Ming, J., James, A., Jancovic, P., Jhumka, A., Kamareddine, F., Kannan, R., Karsligil, M. E., Katircioglu, S. T., Khalid, A., Kokossis, A., Kontis, K., Kulekci, M. O., Laukaitis, A., Leeson, M., Limbachiya, M. C., Li, L., Lin, P., Ling, W. -K, Macias Lopez, E. M., Lovas, T., Luglio, M., Mainardi, S., Mahanti, P. K., Marinos, I., Maropoulos, P., Mativenga, P., Mavrommatis, G., Meintanis, S. G., Meisel, Y. D., Mekid, S., Mias, C., Morin, A., Musliu, N., Nabhani, F., Naguib, R., Olatunbosun, O., Olsen, S., Ozalp, A. A., Pang, A. -C, Pao, W. K. -S, Piera, M. A., Pinciroli, F., Popescu, T. D., Power, H., Prewett, P. D., Putrus, G. A., Railton, C., Raja, V., Resta, M., Ristic, M., Roy, R., Alessandra Russo, Sadri, F., Sahinkaya, M. N., Sakata, T., Salous, S., Sazhin, S., Scepi, G., Seneviratne, L., Seng, Q. T., Shammas, N., Shepherd, D. E. T., Short, T., Siddique, M. N. H., Singh, R., Sirlantzis, K., Solanas, A., Stathaki, T., Todd-Pokropek, A., Velez, F. J., Vicent, A. M. P., Virdee, B., Walters, R. J., Wang, C. H. -T, Wang, J., Wang, W., Wang, X. -Z, Ware, M., Webb, P., Wen, D., Wen, J., Wood, A., Woodhead, R., Woods, J., Wu, Q. H., Utyuzhnikov, S. V., Xu, H., Xu, Y., Yan, Y., Yang, G. -C, Yang, W., Yang, X. -S, Yu, H. -F, Zhao, Y., Zharkova, V., Zhong, Q. -C, and Zopounidis, C.

46. WCE 2010 - World Congress on Engineering 2010: Preface

Author

Ahmad, M., Alexandrou, I., Al-Nuaimy, W., Amavasai, B. P., An, Y. -Y, Ariwa, E., Arteche, J., Audrino, F., Ayesh, A., Baber, C., Bailey, C., Balkan, N., Barria, J., Bartosova, J., Benkrid, K., Bleijs, H., Bluck, M., Bose, I., Bouzas, P. R., Braiden, P. M., Brdys, M., Burriesci, G., Cannataro, M., Carvalho, A., Chang, C. -C, Chen, D., Chen, G. G., Chen, Y. -S, Chiclana, F., Cooke, A., Das, D. B., Davis, D. N., Dayoub, I., Deb, S., Demetriou, I. C., Devai, F., Dilmaghani, R. S., Dini, D., Drikakis, D., Durkan, C., Durodola, J., Etebar, K., Fenn, P., Figueiredo, A., Florou, G., Freear, S., Gabrys, B., Galbraith, G. H., Gaskell, P. H., elena gaura, Ge, Z. -Q, Ghafouri-Shiraz, H., Ghavami, M., Giannopoulos, K., Gonzalez, R. E. P., Gracia, A. M., Grecos, C., Guan, L., Gulpinar, N., Guo, R., Guo, Y., Hardalupas, Y., He, L., Herrero, J. R., Hicks, B. J., Hines, E. L., Hodgson, S., Horsfall, A., Hosein, P., Hu, F., Hu, H., Ijomah, W., Ming, J., James, A., Jancovic, P., Jhumka, A., Kamareddine, F., Kannan, R., Karsligil, M. E., Katircioglu, S. T., Khalid, A., Kokossis, A., Kontis, K., Kulekci, M. O., Laukaitis, A., Leeson, M., Limbachiya, M. C., Li, L., Lin, P., Ling, W. -K, Macias Lopez, E. M., Lovas, T., Luglio, M., Mainardi, S., Mahanti, P. K., Marinos, I., Maropoulos, P., Mativenga, P., Mavrommatis, G., Meintanis, S. G., Meisel, Y. D., Mekid, S., Mias, C., Morin, A., Musliu, N., Nabhani, F., Naguib, R., Olatunbosun, O., Olsen, S., Ozalp, A. A., Pang, A. -C, Pao, W. K. -S, Piera, M. A., Pinciroli, F., Popescu, T. D., Power, H., Prewett, P. D., Putrus, G. A., Railton, C., Raja, V., Resta, M., Ristic, M., Roy, R., Russo, A., Sadri, F., Sahinkaya, M. N., Sakata, T., Salous, S., Sazhin, S., Scepi, G., Seneviratne, L., Seng, Q. T., Shammas, N., Shepherd, D. E. T., Short, T., Siddique, M. N. H., Singh, R., Sirlantzis, K., Solanas, A., Stathaki, T., Todd-Pokropek, A., Velez, F. J., Vicent, A. M. P., Virdee, B., Walters, R. J., Wang, C. H. -T, Wang, J., Wang, W., Wang, X. -Z, Ware, M., Webb, P., Wen, D., Wen, J., Wood, A., Woodhead, R., Woods, J., Wu, Q. H., Utyuzhnikov, S. V., Xu, H., Xu, Y., Yan, Y., Yang, G. -C, Yang, W., Yang, X. -S, Yu, H. -F, Zhao, Y., Zharkova, V., Zhong, Q. -C, and Zopounidis, C.

47. WCE 2010 - World Congress on Engineering 2010: Preface

Author

Korsunsky, A. M., Hunter, A., Hukins, D. W. L., Gelman, L., Hogger, C. J., Ceglarek, D. J., Payne, S., Ao, S. I., Ahmad, M., Alexandrou, I., Al-Nuaimy, W., Amavasai, B. P., An, Y. -Y, Ariwa, E., Arteche, J., Audrino, F., Ayesh, A., Baber, C., Bailey, C., Balkan, N., Barria, J., Bartosova, J., Benkrid, K., Bleijs, H., Bluck, M., Bose, I., Bouzas, P. R., Braiden, P. M., Brdys, M., Burriesci, G., Cannataro, M., Carvalho, A., Chang, C. -C, Chen, D., Chen, G. G., Chen, Y. -S, Chiclana, F., Cooke, A., Das, D. B., Davis, D. N., Dayoub, I., Raman, S. D. C. V., Demetriou, I. C., Devai, F., Dilmaghani, R. S., Dini, D., Drikakis, D., Durkan, C., Durodola, J., Etebar, K., Fenn, P., Figueiredo, A., Florou, G., Freear, S., Gabrys, B., Galbraith, G. H., Gaskell, P. H., Gaura, E., Ge, Z. -Q, Ghafouri-Shiraz, H., Ghavami, M., Giannopoulos, K., Pruneda Gonzalez, R. E., Gracia, A. M., Grecos, C., Guan, L., Gulpinar, N., Guo, R., Guo, Y., Hardalupas, Y., He, L., Herrero, J. R., Hicks, B. J., Hines, E. L., Hodgson, S., Horsfall, A., Hosein, P., Hu, F., Hu, O., Ijomah, W., Ming, J., James, A., Jancovic, P., Jhumka, A., Kamareddine, F., Kannan, R., Karsligil, M. E., Katircioglu, S. T., Khalid, A., Kokossis, A., Kontis, K., Kulekci, M. O., Laukaitis, A., Leeson, M., Limbachiya, M. C., Li, L., Lin, P., Ling, W. -K, Macias Lopez, E. M., Lovas, T., Luglio, M., Mainardi, S., Mahanti, P. K., Marinos, I., Maropoulos, P., Mativenga, P., Mavrommatis, G., Meintanis, S. G., Meisel, Y. D., Mekid, S., Mias, C., Morin, A., Musliu, N., Nabhani, F., Naguib, R., Olatunbosun, O., Olsen, S., Ozalp, A. A., Pang, A. -C, Pao, W. K. -S, Piera, M. A., Pinciroli, F., Popescu, T. D., Power, H., Prewett, P. D., Putrus, G. A., Railton, C., Raja, V., Resta, M., Ristic, M., Roy, R., Alessandra Russo, Sadri, F., Sahinkaya, M. N., Sakata, T., Salous, S., Sazhin, S., Scepi, G., Seneviratne, L., Seng, Q. T., Shammas, N., Shepherd, D. E. T., Short, T., Siddique, M. N. H., Singh, R., Sirlantzis, K., Solanas, A., Stathaki, T., Todd-Pokropek, A., Velez, F. J., Vicent, A. M. P., Virdee, B., Walters, R. J., Wang, C. H. -T, Wang, J., Wang, W., Wang, X. -Z, Ware, M., Webb, P., Wen, D., Wen, J., Wood, A., Woodhead, R., Woods, J., Wu, Q. H., Utyuzhnikov, S. V., Xu, H., Xu, Y., Yan, Y., Yang, G. -C, Yang, W., Yang, X. -S, Yu, H. -F, Zhao, Y., Zharkova, V., Zhong, Q. -C, and Zopounidis, C.

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