Simulation and validation of disbond growth in co-cured composite skin–stringer specimens using cohesive elements

Masood, SN and Viswamurthy, SR and Singh, AK and Muthukumar, M and Gaddikeri, KM (2018) Simulation and validation of disbond growth in co-cured composite skin–stringer specimens using cohesive elements. Journal of Composite Materials, 52 (6). pp. 807-822. ISSN 00219983

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Abstract

Separation of skin and stringer is likely to be a failure mode in co-cured composites stiffened panels where there isconsiderable out-of-plane deformation. Such deformations are possible when a stiffened skin structure is loaded incompression/shear beyond buckling or in structures which contain a disbond/delamination at the skin–stringer interface.Prediction of damage initiation and progressive growth in numerical simulations require parameters such as interfacefracture toughness which have to be obtained through specimen tests. Since interface toughness is generally modedependent, this study deals with the design and testing of three different configuration of blade stiffened co-curedcomposite skin–stringer specimens under mode-I and mode-II dominated loading. Finite element numerical modelsare developed using three-dimensional cohesive elements to predict the disbond growth under mode-I and mode-IIdominated loading. The work also addresses the complexities in the convergence of numerical simulations that arise dueto cohesive elements. A systematic way to obtain the best values for cohesive element parameters while finding a balancebetween accuracy of the results, computation time and numerical stability is presented. The present cohesive elementmodelling and analysis methodology successfully predicted the disbond growth in skin–stringer specimen and can be usedto predict disbond/delamination onset or growth in composite stiffened structures subjected to high bending

Item Type:	Article
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials ENGINEERING > Mechanical Engineering ENGINEERING > Structural Mechanics
Depositing User:	Mrs SK Pratibha
Date Deposited:	31 Jan 2022 09:56
Last Modified:	31 Jan 2022 09:56
URI:	http://nal-ir.nal.res.in/id/eprint/13210

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