Weibull statistical analysis and experimental investigation of size effects on tensile behavior of dry unidirectional carbon fiber sheets. (June 2020)

• Record Type: Journal Article
• Authors: Benjeddou, Omrane
• Is Part Of: Polymer testing. Volume 86(2020)
• Publication Date: 2020-06
• Subjects: Size effects -- Dry carbon fibers -- Tensile strength -- Young's modulus -- Weibull distribution; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2020.106498
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: In this study, experimental tests and a statistical analysis are conducted to verify the size effects associated with length on the tensile behavior of dry unidirectional carbon fiber sheets (DUCFS). As a statistical method, the two-parameters Weibull theory is considered. To verify the validity of the Weibull theory, four sets of direct tensile test were made on DUCFS specimens having different lengths. The direct tensile tests consist to evaluate the size effects associated with length on the mechanical properties of DUCFS such as tensile strength and the Young's modulus. The experimental results show a size effect of length on the tensile strength of DUCFS. Indeed, the tensile strength decreases when increasing the specimen length. In addition, the experimental results demonstrate that there is no size effect on the failure mode and on the Young's modulus of DUCFS. Finally, Weibull weakest link theory is used to predict the tensile strength size effect on DUCFS specimens. A good agreement was shown between the test data and predicted results obtained using the Weibull weakest link theory. Highlights: An experimental tests and a statistical analysis are conducted to study the size effects on the tensile behavior of DUCFS. As a statistical method, the two-parameters Weibull theory is considered. The experimental results show a size effect of length on the tensile strength of DUCFS. A good agreement was shown between the test data and the predicted results obtained using the Weibull weakest link theory.