Application of the basic (multiple specimens) and the normalization methods from ASTM E1820 standard to determination of J-R curves of polytetrafluoroethylene (PTFE)

• Grant number: 12/10317-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: January 01, 2013
• End date: May 31, 2014
• Field of knowledge: Engineering - Mechanical Engineering - Mechanics of Solids
• Principal Investigator: Rodrigo Bresciani Canto
• Grantee: Fernanda Silveira Montilha
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated scholarship(s): 13/13779-6 - Improvement of a computational script which applies the normalization method (ASTM E1820-11 standard) to determination of J-R curves of polytetrafluoroethylene (PTFE), BE.EP.IC

Abstract

The main objective of the research is the application (programming in Matlab) of the basic (multiple specimens) and the normalization methods from ASTM E1820 standard to the determination of J-R curves of polytetrafluoroethylene (PTFE). This study is part of a larger scientific project that aims to develop theoretical models for the simulation of the PTFE processing (compaction and sintering) and its in-service mechanical behavior, supported by an international cooperation program (Capes-Cofecub 641-09) among researchers from LMT-Cachan (France), EESC-USP and DEMa-UFSCar. Uniaxial tensile and CT (compact tension) specimens will be prepared under controlled conditions of isostatic compaction (in multiple steps) and sintering. This type of processing allows obtaining an isotropic material with a reduced number of defects (voids, macrocracks, and microcracks). Uniaxial tensile tests will be performed using the digital image correlation technique (DIC) for the measurement of some mechanical properties required for the application of ASTM-E1820 standard. The J-R curve of the normalization method - which requires a monotonic test in a CT specimen- will be compared with another curve, obtained from multiple specimens, by interrupting the loading to measure crack extension. The J-R curves of the two methods will be compared and the application of the linear normalization method will be evaluated against the traditional basic method (multiple specimens).(AU)

Scientific publications

(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)

PATRÍCIA GIUNCHETTI STRABELLI; VINICIUS FIOCCO SCIUTI; FERNANDA SILVEIRA MONTILHA; LEONARDO BRESCIANI CANTO; RODRIGO BRESCIANI CANTO. Influência de variáveis de sinterização na microestrutura de peças de PTFE moldadas por prensagem isostática. POLIMEROS-CIENCIA E TECNOLOGIA, v. 24, n. 5, p. 612-619, 2014-09-30. (12/10319-1, 12/10317-9)