Comparison of damage mechanisms in curved composite laminates under static and fatigue loading

Date

2019-04-01

Author

Tasdemir, B.
Çöker, Demirkan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

252
views

0
downloads

In this paper, damage progression in curved CFRP composite laminates are experimentally investigated for static and fatigue loadings. Two different cross-ply laminate thicknesses are examined with grouped plies to elucidate the failure mechanisms. A test fixture is designed to apply moment/axial combined loading to curved specimens and DIC method is used to obtain the strain distribution in the curved region until failure. Our major finding is that under fatigue loading, the failure location and mechanism are different from that under static loading. Fatigue failure is observed to form where the radial stress is maximum whereas static failure is observed to form where the combined radial, tangential and shear stresses attain a maximum value, in the form of Tsai-Wu failure criterion. For fatigue failure, micro-cracks existing in the maximum radial stress location in the group of 90 degrees layers grow under cyclic loading and coalesce into one major matrix crack which reaches the 0/90 interface gradually to continue as a delamination. On the other hand, static failure initiates inside the group of 90 degrees layers with a dominant crack growing dynamically and jumps to the 0/90 interface near the arms with a 40-50 degrees angle to continue as a delamination.

Subject Keywords

Civil and Structural Engineering, Ceramics and Composites

URI

https://hdl.handle.net/11511/41188

Journal

COMPOSITE STRUCTURES

DOI

https://doi.org/10.1016/j.compstruct.2019.01.072

Collections

Department of Aerospace Engineering, Article

Suggestions

OpenMETU
Core

Design of fiber-reinforced composite pressure vessels under various loading conditions Levend, P; Katirci, N (Elsevier BV, 2002-10-01) An analytical procedure is developed to design and predict the behavior of fiber reinforced composite pressure vessels. The classical lamination theory and generalized plane strain model is used in the formulation of the elasticity problem. Internal pressure, axial force and body force due to rotation in addition to temperature and moisture variation throughout the body are considered. Some 3D failure theories are applied to obtain the optimum values for the winding angle, burst pressure, maximum axial forc...
Evaluation of cement mortars by ultrasound Paksoy, Nesibe Gözde; Yaman, İsmail Özgür; Department of Civil Engineering (2006) Ultrasonic testing of concrete is often used for the assessment of its uniformity, strength, modulus of elasticity, durability and etc. therefore, the related parameters of testing such as the transducer frequency, the specimen geometry and etc. are well-known. On the other hand, most of the concrete properties are affected by the cement and the mechanical as well as some durability properties of cements are determined through cement mortars. Applications of ultrasound on determining the properties of cemen...
Stress redistribution around fiber breaks in unidirectional steel fiber composites considering the nonlinear material behavior SABUNCUOĞLU, BARIŞ; Mutlu, Çağlar; Kadıoğlu, Fevzi Suat; Swolfs, Yentl (Elsevier BV, 2020-05-01) The use of steel fibers as reinforcement in polymer composites is recently increasing thanks to their ductility, high stiffness and wide range of diameters. Unlike carbon and glass fibers, steel fibers often end up with a non-circular cross-section due to their manufacturing technology. This may influence the stress redistribution around fiber breaks, which is important in longitudinal tensile failure of unidirectional composites. A parametric study was performed by using 3D finite element models with rando...
Predicting the shear strength of reinforced concrete beams using artificial neural networks Mansour, MY; Dicleli, Murat; Lee, JY; Zhang, J (Elsevier BV, 2004-05-01) The application of artificial neural networks (ANNs) to predict the ultimate shear strengths of reinforced concrete (RC) beams with transverse reinforcements is investigated in this paper. An ANN model is built, trained and tested using the available test data of 176 RC beams collected from the technical literature. The data used in the ANN model are arranged in a format of nine input parameters that cover the cylinder concrete compressive strength, yield strength of the longitudinal and transverse reinforc...
Prediction of damage in R/C shear panels subjected to reversed cyclic loading Hindi, R; Mansour, M; Dicleli, Murat (Informa UK Limited, 2005-01-01) In this paper, the damage prediction of shear-dominated reinforced concrete (RC) elements subjected to reversed cyclic shear is presented using an existing damage model. The damage model is primarily based on the monotonic energy dissipating capacity of structural elements before and after the application of reversed cyclic loading. Therefore, it could be universally applicable to different types of structural members, including shear-dominated RC members. The applicability of the damage model to shear-domi...

Citation Formats

B. Tasdemir and D. Çöker, “Comparison of damage mechanisms in curved composite laminates under static and fatigue loading,” COMPOSITE STRUCTURES, pp. 190–203, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41188.