Measure of the moment of inertia of solids and liquids: moment of the inertia and internal friction

• Grant number: 07/04094-9
• Support Opportunities: Regular Research Grants
• Start date: September 01, 2008
• End date: August 31, 2010
• Field of knowledge: Physical Sciences and Mathematics - Physics - General Physics
• Principal Investigator: Carlos Alberto Fonzar Pintão
• Grantee: Carlos Alberto Fonzar Pintão
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

In this plan we propose to study the moment of the inertia of a solid body experimentally, with a complex geometry, by using a rotational system with the help of a computer. To this, we resorted to our experience of measuring the moment of inertia of a solid, with a known geometry. In our previous experience, we used a system of measurement with the help of the opt electronic sensor, a circuit RC, an analogic system to measure the electric current and/or an oscilloscope to measure frequency. By using this system, we determine the angular acceleration and the applied torque of the solid, and then, with the slop of best linear fit of the experimental results, we measure its moment of the inertia. By means of a new computerized measurement system, that have specific software, an interface and a sensor of rotational movement to realize the acquisition of the dates, we can use the same methodology used in non computerized system and obtain the rotational inertia of the body. The advantage of the new system is in the acquisition of dates. Information about position, velocity and acceleration are easily obtained. By this means, it is possible to obtain a more rapid result and a better precision in the experiment. To make use of computerized system, we study the dynamic of the rotation to a fluid in a cylinder. We will determine its "moment of inertia". Two situations are considered in our measures, one of them when the fluid is in the solid state and another partially solid. By using these results we can determine the loss of energy because of the intern friction in fluid. (AU)

Scientific publications

(9)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

PIEDADE, LUCAS PEREIRA; PINTAO, CARLOS ALBERTO FONZAR; FOSCHINI, CESAR RENATO; SILVA, MARCOS RIBEIRO DA; AZEVEDO NETO, NILTON FRANCELOSI. Alternative dynamic torsion test to evaluate the elastic modulus of polymers. MATERIALS RESEARCH EXPRESS, v. 7, n. 9, SEP 2020. (07/04094-9, 17/08820-8)

FOSCHINI, CESAR R.; SOUZA, EDSON A. C.; BORGES, ANA F. S.; PINTAO, CARLOS A. F.. A new approach to measure the elasticity modulus for ceramics using the deformation energy method. Journal of Mechanical Science and Technology, v. 30, n. 8, p. 3585-3590, AUG 2016. (07/04094-9)

PINTAO, CARLOS A. F.; CORREA, DIEGO R. N.; GRANDINI, CARLOS R.. Torsion modulus as a tool to evaluate the role of thermo-mechanical treatment and composition of dental Ti-Zr alloys. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 8, n. 5, p. 4631-4641, SEP-OCT 2019. (07/04094-9, 10/20440-7, 15/00851-6)

FONZAR PINTAO, CARLOS ALBERTO; CARDOSO, CELSO XAVIER. Elastic modulus of PVDF with bentonite or LiNbO3 using deformation energy. POLIMEROS-CIENCIA E TECNOLOGIA, v. 27, n. 3, p. 183-188, JUL-SEP 2017. (07/04094-9)

CARLOS ALBERTO FONZAR PINTÃO; LUCAS PEREIRA PIEDADE; EDGAR BORALI. System to measure torsion modulus of polymers using the deformation energy method. POLIMEROS-CIENCIA E TECNOLOGIA, v. 29, n. 3, 2019-08-01. (07/04094-9, 17/08820-8)

FONZAR PINTAO, CARLOS ALBERTO. Measurement of the rotational inertia of bodies by using mechanical spectroscopy. Journal of Mechanical Science and Technology, v. 28, n. 10, p. 4011-4020, OCT 2014. (07/04094-9)

FONZAR PINTAO, CARLOS ALBERTO; CORREA, DIEGO R. N.; GRANDINI, CARLOS R.. Torsion modulus using the technique of mechanical spectroscopy in biomaterials. Journal of Mechanical Science and Technology, v. 31, n. 5, p. 2203-2211, MAY 2017. (07/04094-9)

CARLOS ALBERTO FONZAR PINTÃO; AIRTON BAGGIO; LUCAS PEREIRA PIEDADE; LUIZ EDUARDO DE ANGELO SANCHEZ; GILBERTO DE MAGALHÃES BENTO GONÇALVES. Torsion modulus with CaCO3 fillers in unsaturated polyester resin - mechanical spectroscopy. POLIMEROS-CIENCIA E TECNOLOGIA, v. 32, n. 2, 2022-07-29. (07/04094-9, 15/00851-6)

FONZAR PINTAO, CARLOS ALBERTO; CARDOSO, CELSO XAVIER. Elastic modulus of PVDF with bentonite or LiNbO3 using deformation energy. POLIMEROS-CIENCIA E TECNOLOGIA, v. 27, n. 3, p. 6-pg., 2017-07-01. (07/04094-9)