Numerical modeling of mechanical behavior of multilayered composite plates with defects under static loading

Winter School on Continuous Media Mechanics

Korepanov, V.V.^1 ; Serovaev, G.S.^1

Institute of Continuous Media Mechanics UB RAS, Acad. Korolev St. 1, Perm

614013, Russia^1

关键词: Anti-adhesive coating;    Based on detections;    Contact interaction;    Mechanical behavior;    Multi-layered plates;    Multilayered composite plates;    Numerical calculation;    Polymer-based composite materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/208/1/012020/pdf
DOI  :  10.1088/1757-899X/208/1/012020

来源: IOP

【 摘 要 】

Evaluation of the mechanical state of a structure or its components in the process of operation based on detection of internal damages (damage detection) becomes especially important in such rapidly developing spheres of production as machine building, aerospace industry, etc. One of the most important features of these industries is the application of new types of materials among which polymer based composite materials occupy a significant position. Hence, they must have sufficient operational rigidity and strength. However, defects of various kinds may arise during the manufacture. Delamination is the most common defect in structures made from composite materials and represents a phenomenon that involves the complex fracture of layers and interlayer compounds. Among the reasons of delamination occurrence are: disposition of anti-adhesive lubricants, films; insufficient content of binder, high content of volatile elements; violation of the molding regime; poor quality of anti-adhesive coating on the surface of the tooling. One of the effective methods for analyzing the influence of defects is numerical simulation. With the help of numerical methods, it is possible to track the evolution of various parameters when the defect size and quantity change. In the paper, a multilayered plate of an equally resistant carbon fiber reinforced plastic was considered, with a thickness of each layer equal to 0.2 mm. Various static loading cases are studied: uniaxial tension, three and four-point bending. For each type of loading, a numerical calculation of the stress-strain state was performed for healthy and delaminated plates, with different number and size of the defects. Contact interaction between adjacent surfaces in the zone of delamination was taken into account.