Stress Relaxation in Delaminated Carbon/Epoxy Composites

• DOI: 10.1007/s12221-019-8916-x
• Publication Date: 2019-06-25T13:33:00Z
• Authors: P. N. B. Reis; M. P. Silva; P. Santos
• Keywords: 02 engineering and technology; 0210 nano-technology

for the different loading modes, literature reports conveniently the delaminations’ effect on the mechanical properties. However, as consequence of the inherent viscoelasticity of the matrix phase, polymer composites are prone to stress relaxation, making it a great challenge when they are used in long-term applications. Therefore, stress relaxation tests were carried out on the bending mode, and the stress was recorded during the time. It is possible to conclude that the stress decreases with the time, however, this tend becomes more pronounced with the increasing of the delamination’s length. The results were fitted following the Kohlrausch-Williams-Watts model, evidencing good accuracy of the model for the stress relaxation time.