TY  - CONF
AU  - Ćosić, Petar
AU  - Petrašinović, Miloš
AU  - Grbović, Aleksandar
AU  - Petrašinović, Danilo
AU  - Petrović, Mihailo
AU  - Petrović, Veljko
AU  - Raičević, Nikola
AU  - Rašuo, Boško
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7730
AB  - Aerospace engineering, as a field in which the reduction of mass has always been one of the primary tasks of its engineers, has made significant progress as a result of numerous developments and advancements in the field of composite materials in the sense of gaining large benefits from the relatively low density that characterizes composites. In the spirit of the increasing use of composite materials on aerospace structures, in this paper we will conduct an experimental and numerical analysis of the strength of a drone arm made of a composite material. Every method of analysis, whether it is analytical, numerical, or experimental, has some advantages and disadvantages. Experimental results are easily affected by random and instrumental errors and numerical methods are highly affected by the chosen physical model. In order to obtain the most reliable analysis solution, a mixture of numerical analysis backed up by experimental data is required. In the hope of bypassing the expensive and time-consuming experiments in the future, in this paper we will conduct a numerical analysis on a drone arm made of composite materials which will then be replicated by an experiment verifying its validity.
PB  - The Serbian Society of Mechanics
C3  - 9th International Congress of the Serbian Society of Mechanics
T1  - Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material
EP  - 300
SP  - 293
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7730
ER  - 

@conference{
author = "Ćosić, Petar and Petrašinović, Miloš and Grbović, Aleksandar and Petrašinović, Danilo and Petrović, Mihailo and Petrović, Veljko and Raičević, Nikola and Rašuo, Boško",
year = "2023",
abstract = "Aerospace engineering, as a field in which the reduction of mass has always been one of the primary tasks of its engineers, has made significant progress as a result of numerous developments and advancements in the field of composite materials in the sense of gaining large benefits from the relatively low density that characterizes composites. In the spirit of the increasing use of composite materials on aerospace structures, in this paper we will conduct an experimental and numerical analysis of the strength of a drone arm made of a composite material. Every method of analysis, whether it is analytical, numerical, or experimental, has some advantages and disadvantages. Experimental results are easily affected by random and instrumental errors and numerical methods are highly affected by the chosen physical model. In order to obtain the most reliable analysis solution, a mixture of numerical analysis backed up by experimental data is required. In the hope of bypassing the expensive and time-consuming experiments in the future, in this paper we will conduct a numerical analysis on a drone arm made of composite materials which will then be replicated by an experiment verifying its validity.",
publisher = "The Serbian Society of Mechanics",
journal = "9th International Congress of the Serbian Society of Mechanics",
title = "Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material",
pages = "300-293",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7730"
}

Ćosić, P., Petrašinović, M., Grbović, A., Petrašinović, D., Petrović, M., Petrović, V., Raičević, N.,& Rašuo, B.. (2023). Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material. in 9th International Congress of the Serbian Society of Mechanics
The Serbian Society of Mechanics., 293-300.
https://hdl.handle.net/21.15107/rcub_machinery_7730

Ćosić P, Petrašinović M, Grbović A, Petrašinović D, Petrović M, Petrović V, Raičević N, Rašuo B. Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material. in 9th International Congress of the Serbian Society of Mechanics. 2023;:293-300.
https://hdl.handle.net/21.15107/rcub_machinery_7730 .

Ćosić, Petar, Petrašinović, Miloš, Grbović, Aleksandar, Petrašinović, Danilo, Petrović, Mihailo, Petrović, Veljko, Raičević, Nikola, Rašuo, Boško, "Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material" in 9th International Congress of the Serbian Society of Mechanics (2023):293-300,
https://hdl.handle.net/21.15107/rcub_machinery_7730 .

TY  - CONF
AU  - Petrašinović, Miloš
AU  - Petrašinović, Danilo
AU  - Grbović, Aleksandar
AU  - Petrović, Veljko M.
AU  - Petrović, Mihailo
AU  - Raičević, Nikola
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5738
AB  - The constant advance in the usage of unmanned aerial vehicles (UAVs) of all types, including electric multicopters (rotary-wing drones), requests further advancement on all project levels in order to create a competitive final product. With the usage of composite materials, mainly carbon fiber in epoxy resin, it is possible to have a very lightweight structure that is strong enough to sustain all anticipated loads. Arms are a crucial part of multicopter structures that are often made entirely of composite materials. Each multicopter arm has at least one electric motor and propeller on one and a connection with the body on the other end. A static load test stand for various sizes of arms is designed and developed in order to test prototypes within the design process and to be able to test the mechanical characteristics of each produced final part that will be later assembled with other parts. The test stand consists of a robust steel frame, part mounting clamps, a movable low-speed hydraulic cylinder with an appropriate hydraulic power pack powered by an electric motor which is controlled by a variable frequency drive, a load cell for force measurement, and a linear displacement transducer for displacement. A custom digital electronic circuit with a microcontroller is developed in order to control the actuator and obtain data from sensors. Also, custom user-friendly software with a graphical user interface is designed to control experiments and process measurements.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
T1  - Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms
EP  - 44
SP  - 44
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5738
ER  - 

@conference{
author = "Petrašinović, Miloš and Petrašinović, Danilo and Grbović, Aleksandar and Petrović, Veljko M. and Petrović, Mihailo and Raičević, Nikola",
year = "2022",
abstract = "The constant advance in the usage of unmanned aerial vehicles (UAVs) of all types, including electric multicopters (rotary-wing drones), requests further advancement on all project levels in order to create a competitive final product. With the usage of composite materials, mainly carbon fiber in epoxy resin, it is possible to have a very lightweight structure that is strong enough to sustain all anticipated loads. Arms are a crucial part of multicopter structures that are often made entirely of composite materials. Each multicopter arm has at least one electric motor and propeller on one and a connection with the body on the other end. A static load test stand for various sizes of arms is designed and developed in order to test prototypes within the design process and to be able to test the mechanical characteristics of each produced final part that will be later assembled with other parts. The test stand consists of a robust steel frame, part mounting clamps, a movable low-speed hydraulic cylinder with an appropriate hydraulic power pack powered by an electric motor which is controlled by a variable frequency drive, a load cell for force measurement, and a linear displacement transducer for displacement. A custom digital electronic circuit with a microcontroller is developed in order to control the actuator and obtain data from sensors. Also, custom user-friendly software with a graphical user interface is designed to control experiments and process measurements.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022",
title = "Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms",
pages = "44-44",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5738"
}

Petrašinović, M., Petrašinović, D., Grbović, A., Petrović, V. M., Petrović, M.,& Raičević, N.. (2022). Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
Innovation Center of Faculty of Mechanical Engineering., 44-44.
https://hdl.handle.net/21.15107/rcub_machinery_5738

Petrašinović M, Petrašinović D, Grbović A, Petrović VM, Petrović M, Raičević N. Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022. 2022;:44-44.
https://hdl.handle.net/21.15107/rcub_machinery_5738 .

Petrašinović, Miloš, Petrašinović, Danilo, Grbović, Aleksandar, Petrović, Veljko M., Petrović, Mihailo, Raičević, Nikola, "Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms" in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022 (2022):44-44,
https://hdl.handle.net/21.15107/rcub_machinery_5738 .

TY  - JOUR
AU  - Elmiladi, Abdulrazag Abdallah
AU  - Petrović, Veljko M.
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Balać, Igor
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3524
AB  - This paper presents numerical calculation of thermal stresses generated in a carbon fiber-epoxy laminated composite structure which is operating at low temperatures. The thermal stress evaluation is based on the finite element method. A sample problem involving generated thermal stresses in a real laminated composite structure, exposed to low temperatures (four different temperature levels), is analyzed and discussed. Obtained results suggest that these thermal stresses remarkably decrease the strength of the laminated composite structure.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Numerical evaluation of thermal stresses generated in laminated composite structure exposed to low temperatures
EP  - 3856
IS  - 5
SP  - 3847
VL  - 25
DO  - 10.2298/TSCI200729338E
ER  - 

@article{
author = "Elmiladi, Abdulrazag Abdallah and Petrović, Veljko M. and Grbović, Aleksandar and Sedmak, Aleksandar and Balać, Igor",
year = "2021",
abstract = "This paper presents numerical calculation of thermal stresses generated in a carbon fiber-epoxy laminated composite structure which is operating at low temperatures. The thermal stress evaluation is based on the finite element method. A sample problem involving generated thermal stresses in a real laminated composite structure, exposed to low temperatures (four different temperature levels), is analyzed and discussed. Obtained results suggest that these thermal stresses remarkably decrease the strength of the laminated composite structure.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Numerical evaluation of thermal stresses generated in laminated composite structure exposed to low temperatures",
pages = "3856-3847",
number = "5",
volume = "25",
doi = "10.2298/TSCI200729338E"
}

Elmiladi, A. A., Petrović, V. M., Grbović, A., Sedmak, A.,& Balać, I.. (2021). Numerical evaluation of thermal stresses generated in laminated composite structure exposed to low temperatures. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 25(5), 3847-3856.
https://doi.org/10.2298/TSCI200729338E

Elmiladi AA, Petrović VM, Grbović A, Sedmak A, Balać I. Numerical evaluation of thermal stresses generated in laminated composite structure exposed to low temperatures. in Thermal Science. 2021;25(5):3847-3856.
doi:10.2298/TSCI200729338E .

Elmiladi, Abdulrazag Abdallah, Petrović, Veljko M., Grbović, Aleksandar, Sedmak, Aleksandar, Balać, Igor, "Numerical evaluation of thermal stresses generated in laminated composite structure exposed to low temperatures" in Thermal Science, 25, no. 5 (2021):3847-3856,
https://doi.org/10.2298/TSCI200729338E . .

TY  - JOUR
AU  - Petrović, Veljko M.
AU  - Buljak, Vladimir
AU  - Cornaggia, Aram
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3563
AB  - U ovom radu proučavan je uticaj neuniformnosti temperaturnog polja po uzorku na rezultate simulacije procesa sinterovanja. Kao konstitutivni model ponašanja materijala upotrebljen je modifikovan fenomenološki Skorohod-Olevski viskozni model sinterovanja. Poređeni su rezultati simulacije dobijeni korišćenjem uniformne raspodele temperature, sa rezultatima koji koriste temperaturno polje dobijeno simulacijom zagrevanj auzorka. Poređenja se odnose na uzorke različiti hveličina, kako bi se ispitao različiti nivo neuniformnosti. Dobijeni rezultati u ovoj studiji pokazuju da postoje situacije u kojima je potrebno uzeti u obzir neuniformnost raspodele temperature po uzorku, odnosno da pojednostavljenje modela korišćenjem uniformne raspodele dovodi do neprihvatljivih grešaka.
AB  - This paper investigates the influence of temperature field non-uniformity on sintering simulation results using the Skorohod-Olevsky viscous sintering model. As a difference to previous studies, here a thermal transient analysis is performed to provide a detailed temperature field over the component within sintering time. Results obtained using uniform temperature distribution are compared to those obtained using a nonuniform distribution derived from a transient thermal analysis. Results are compared for different geometry sizes, that lead to different temperature non-uniformity levels. The study has shown that the temperature nonuniformity cannot always be neglected and should be considered as a possible source of modeling error.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Osetljivost skorohodolevski viskoznog modela sinterovanja na promenu temperaturnog polje po uzorku u toku sinterovanja
T1  - Skorohod-Olevsky viscous sintering model sensitivity to temperature distribution during the sintering process
EP  - 725
IS  - 3
SP  - 719
VL  - 49
DO  - 10.5937/fme2103719P
ER  - 

@article{
author = "Petrović, Veljko M. and Buljak, Vladimir and Cornaggia, Aram",
year = "2021",
abstract = "U ovom radu proučavan je uticaj neuniformnosti temperaturnog polja po uzorku na rezultate simulacije procesa sinterovanja. Kao konstitutivni model ponašanja materijala upotrebljen je modifikovan fenomenološki Skorohod-Olevski viskozni model sinterovanja. Poređeni su rezultati simulacije dobijeni korišćenjem uniformne raspodele temperature, sa rezultatima koji koriste temperaturno polje dobijeno simulacijom zagrevanj auzorka. Poređenja se odnose na uzorke različiti hveličina, kako bi se ispitao različiti nivo neuniformnosti. Dobijeni rezultati u ovoj studiji pokazuju da postoje situacije u kojima je potrebno uzeti u obzir neuniformnost raspodele temperature po uzorku, odnosno da pojednostavljenje modela korišćenjem uniformne raspodele dovodi do neprihvatljivih grešaka., This paper investigates the influence of temperature field non-uniformity on sintering simulation results using the Skorohod-Olevsky viscous sintering model. As a difference to previous studies, here a thermal transient analysis is performed to provide a detailed temperature field over the component within sintering time. Results obtained using uniform temperature distribution are compared to those obtained using a nonuniform distribution derived from a transient thermal analysis. Results are compared for different geometry sizes, that lead to different temperature non-uniformity levels. The study has shown that the temperature nonuniformity cannot always be neglected and should be considered as a possible source of modeling error.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Osetljivost skorohodolevski viskoznog modela sinterovanja na promenu temperaturnog polje po uzorku u toku sinterovanja, Skorohod-Olevsky viscous sintering model sensitivity to temperature distribution during the sintering process",
pages = "725-719",
number = "3",
volume = "49",
doi = "10.5937/fme2103719P"
}

Petrović, V. M., Buljak, V.,& Cornaggia, A.. (2021). Osetljivost skorohodolevski viskoznog modela sinterovanja na promenu temperaturnog polje po uzorku u toku sinterovanja. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 49(3), 719-725.
https://doi.org/10.5937/fme2103719P

Petrović VM, Buljak V, Cornaggia A. Osetljivost skorohodolevski viskoznog modela sinterovanja na promenu temperaturnog polje po uzorku u toku sinterovanja. in FME Transactions. 2021;49(3):719-725.
doi:10.5937/fme2103719P .

Petrović, Veljko M., Buljak, Vladimir, Cornaggia, Aram, "Osetljivost skorohodolevski viskoznog modela sinterovanja na promenu temperaturnog polje po uzorku u toku sinterovanja" in FME Transactions, 49, no. 3 (2021):719-725,
https://doi.org/10.5937/fme2103719P . .

TY  - JOUR
AU  - Saleem, Alteer
AU  - Petrović, Veljko M.
AU  - Grbović, Aleksandar
AU  - Lozanović Šajić, Jasmina
AU  - Balać, Igor
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3595
AB  - The effect of elevated and lowered temperatures on the elastic properties of carbon fiber-epoxy composite material was studied using multi-phase unit cell (MPUC) numerical model. Evaluation of the elastic properties of carbon fiber-epoxy composite material is based on the finite element method. Obtained results confirmed that elevated and lowered temperature has noticeable influence on elastic properties of carbon fiber-epoxy composite material. As demonstrated, this fact has considerable influence on accurate evaluation of generated thermal stresses in real laminated composite structures, exposed to extremely high or low operating temperatures.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Numerical Evaluation of the Elastic Properties of Carbon Fiber Reinforced Composite Material at Elevated and Lowered Temperatures
EP  - 136
IS  - 1
SP  - 127
VL  - 53
DO  - 10.2298/SOS2101127S
ER  - 

@article{
author = "Saleem, Alteer and Petrović, Veljko M. and Grbović, Aleksandar and Lozanović Šajić, Jasmina and Balać, Igor",
year = "2021",
abstract = "The effect of elevated and lowered temperatures on the elastic properties of carbon fiber-epoxy composite material was studied using multi-phase unit cell (MPUC) numerical model. Evaluation of the elastic properties of carbon fiber-epoxy composite material is based on the finite element method. Obtained results confirmed that elevated and lowered temperature has noticeable influence on elastic properties of carbon fiber-epoxy composite material. As demonstrated, this fact has considerable influence on accurate evaluation of generated thermal stresses in real laminated composite structures, exposed to extremely high or low operating temperatures.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Numerical Evaluation of the Elastic Properties of Carbon Fiber Reinforced Composite Material at Elevated and Lowered Temperatures",
pages = "136-127",
number = "1",
volume = "53",
doi = "10.2298/SOS2101127S"
}

Saleem, A., Petrović, V. M., Grbović, A., Lozanović Šajić, J.,& Balać, I.. (2021). Numerical Evaluation of the Elastic Properties of Carbon Fiber Reinforced Composite Material at Elevated and Lowered Temperatures. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 53(1), 127-136.
https://doi.org/10.2298/SOS2101127S

Saleem A, Petrović VM, Grbović A, Lozanović Šajić J, Balać I. Numerical Evaluation of the Elastic Properties of Carbon Fiber Reinforced Composite Material at Elevated and Lowered Temperatures. in Science of Sintering. 2021;53(1):127-136.
doi:10.2298/SOS2101127S .

Saleem, Alteer, Petrović, Veljko M., Grbović, Aleksandar, Lozanović Šajić, Jasmina, Balać, Igor, "Numerical Evaluation of the Elastic Properties of Carbon Fiber Reinforced Composite Material at Elevated and Lowered Temperatures" in Science of Sintering, 53, no. 1 (2021):127-136,
https://doi.org/10.2298/SOS2101127S . .