Deformation of carbon fiber-reinforced plastic deformation under the time-varying loads

Deformable body mechanics


Аuthors

Ruslantsev A. N.1*, Dumansky A. M.2**

1. Bauman Moscow State Technical University, MSTU, 5, bldg. 1, 2-nd Baumanskaya str., Moscow, 105005, Russia
2. Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4, M. Khariton'evskii per., Moscow, 101990, Russia

*e-mail: andreiruslantsev@gmail.com
**e-mail: alduman@rambler.ru

Abstract

Rheological effects such as creep and relaxation may appear in the material when operating under long-time load. This can lead to a delayed fracture, so it is important to analyze the regularities of polymer composite materials deformation with account to the time factor. The presented article considers models implemented for describing rheological effects, shows their advantages and disadvantages.

The most common cases of loading can be described by the relationships of hereditary mechanics. Besides the fact that the hereditary approach is the most common form of a relationships between stresses and deformations at time varying loads, it allows identify a number of interrelated functions characterizing the material.

A model based on the matrix equations of the theory of laminated plates and relations of a hereditary type is proposed. It allows establish the dependence of deformations from time under time-varying loading.

To reveal time effects, the test for creep and relaxation of BMI-3/3692 carbon fiber-reinforced plastics samples with reinforcement scheme [±45°] and KMU-4L with reinforcement scheme [±20°] were performed. The BMI-3/3692 samples were tested for creep at time-varying loading also. The KMU-4L samples were tested for creep and relaxation. Resistive strain gages were employed to register longitudinal and transverse deformations. Nonlinearity and hysteresis are appearing on the stress-strain diagrams of the tested samples. Likewise, the diagrams of stresses and deformations are essentially dissimilar to each other, which can be explained by time-dependent factors.

Calculation for BMI-3/3692 carbon plastics with reinforcement scheme [± 45°] and KMU-4L with reinforcement scheme [± 20°] was performed employing the model proposed in the work. The Abel kernel was chosen as a creep kernel. Rabotnov kernel was used as a relaxation kernel.

Mechanical characteristics of the BMI-3/3692 carbon plastic were determined: E1 = 84 GPa, E2 = 80 GPa, ν12 = 0.04. G12 = 7.5 GPa. . The kernel parameters were determined by the least-squares method. Minimum of disparity of computed and experimental parameters was determined numerically. The following parameters values were obtained: α = –0.7, β = –0.05, k = 800.

The elastic characteristics of the of KMU-4 carbon plastic monolayer were determined: E1 = 150 GPa, E2 = 4 GPa, ν12 = 0.32. G12 = 3.3 GPa. The kernel parameters were also determined numerically: α = –0.8, β = –0.05, k = 150.

The article presents the graphs demonstrating a good correspondence between calculated and experimental data.

The proposed model can be used to calculate the stress-strain state of composite structures while long-term deformation.

Keywords:

carbon fiber-reinforced plastic, hereditary mechanics, creep, recovery, theory of laminated plates

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