Study of the fatigut strenght of layered polymer composite materials taking into account damage

Аuthors

Bogomolova A. D.^*, Palchikov D. S.^**

Central Institute of Aviation Motors named after P.I. Baranov, CIAM, 2, Aviamotornaya str., Moscow, 111116, Russia

*e-mail: adbogomolova@ciam.ru
**e-mail: dspalchikov@ciam.ru

Abstract

The presented article deals with the experimental study of damage growth in a polymer composite material (PCM) under cyclic loading (compression). The authors considered four damage categories and various failure mechanisms that follow alternatively. Initially, at the first stage, the matrix cracks inside all layers due to the tension along the matrix-fiber interface. At the second stage, the composite delaminates into separate layers under the action of interlayer shear. When the maximum load is reached, the fibers begin to break. At the fourth stage, the sample is destroyed. Cyclic tests of damaged PCM samples were employed to obtain the dependences of the damage size and residual strength on the number of loading cycles. Application of non-destructive testing methods (ultrasonic flaw detection) for measuring the damage size in PCM is demonstrated. The results of the said studies were employed to develop an approach to assessing the permissible damage level for the PCM parts. The proposed approach is based on the analysis of changes in the residual strength of the damaged carbon fiber reinforced plastic depending on the number of loading cycles. The effect of moisture on the strength of damaged PCM was studied as well, comparison of the results was performed, and the rate of damage growth inside the material was determined.

Keywords:

polymer composite material (PCM), strength, damage, cyclic compression tests

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