Dynamic analysis for delamination detection in carbon fiber composite beam

2nd International conference on Advances in Mechanical Engineering

Sadarang, J.^1 ; Nayak, S.^1 ; Nayak, G.^1 ; Panigrahi, I.^1 ; Nayak, R.K.^1

School of Mechanical Engineering, KIIT University, Bhubaneswar, Odisha

751024, India^1

关键词: Carbon fiber composite;    Carbon fiber reinforced composite;    Delaminated composites;    Delamination detections;    Dynamic environments;    Nondestructive testing method;    Numerical approaches;    Ultrasonic inspections;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/402/1/012143/pdf
DOI  :  10.1088/1757-899X/402/1/012143

来源: IOP

【 摘 要 】

Delaminations in the composite structure are the main causes of structural failure. It not only degrades the strength and durability of the composites but also makes it prone to failure. It also affects the vibration properties like natural frequency and mode shapes. Hence understanding the features of an undamaged and delaminated composite in a dynamic environment is very essential. There are various non-destructive testing methods like ultrasonic inspection, thermography, X-Ray Diffraction and X-Ray Radiography etc for determination of the defects in the composite structure which is time consuming and costly. This paper investigates the presence of delamination in sub-layer of carbon fiber reinforced composite through modeling and simulation. Vibration tests were performed initially to determine the natural frequencies and the damping rate of both undamaged and delaminated composites. The separate models for undamaged and delaminated composites were designed using ANSYS and a good agreement was found between the experimental and the numerical approaches. It is observed that due to the presence of delamination, the natural frequency decreases and the rate of damping increases as compared to an undamaged composite structure. Different mode shapes were also obtained to show the differences between undamaged and delaminated composites beams.