Progressive damage analysis of CFRP Laminate with circular cutouts under flexural loading

S, Gurucharan and M, Ramji (2018) Progressive damage analysis of CFRP Laminate with circular cutouts under flexural loading. Masters thesis, Indian Institute of Technology Hyderabad.

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Application of a flexural or bending load on a Carbon fiber reinforced polymer(CFRP) specimen leads to both tensile and compressive stress state across the thickness of the specimen thereby resulting in a more complex damage behavior as the tensile and compressive failure modes of a composite material are different. Study of damage behavior of specimen includes location of damage initiation, damage propagation, various types damage modes and their interactions, prediction of damage initiation load and final failure load. Damage behavior of the CFRP specimen has to be studied for its efficient and sustainable design. In the present thesis, damage behavior of pristine CFRP specimen (without hole), specimen with both single circular hole and multiple circular holes having three different configurations (two hole longitudinal (2HL), two hole transverse (2HT) and two hole diagonal (2HD)) was studied both experimentally and numerically under four point flexural loading. The layup sequence of the CFRP specimen having Unidirectional (UD) [0]16 and Quasi-isotropic [−45/0/45/90]2s are studied. Two-dimensional Digital Image correlation(DIC) technique was employed for capturing the in-plane displacement and strains across the thickness of the specimen. Finite element (FE) based Progressive damage analysis(PDA) the CFRP specimen was performed. In the progressive damage model, Hashin’s failure criteria was implemented for the prediction of damage initiation of both fiber or matrix at a lamina level, material property degradation model was implemented for modelling damage evolution in the specimen and cohesive zone model was implemented for predicting the intiation and propagation of interlaminar delamination between layers of the specimen. Damage behavior of the specimen obtained from experiment was compared with the results obtained from PDM for validation. Additionally, the variation of load vs displacement, longitudinal strain distribution over the thickness face of the CFRP specimen obtained both experimentally and numerically were studied and the corresponding plots obtained from both were compared.Finally, the load carrying capacity of pristine specimen, specimen with single hole and specimen with multiple holes with three different configurations (2HL,2HT and 2HD) were compared and it was also seen which type of specimen according to the two lay up sequences which are unidirectional [0]16 and Quasi [−45/0/45/90]2s was more stiffer and stronger

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IITH Creators:
IITH CreatorsORCiD
Item Type: Thesis (Masters)
Uncontrolled Keywords: CFRP, Digital Image Correlation, Progressive Damage analysis, Finite element
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 17 Jul 2018 10:58
Last Modified: 17 Jul 2018 10:58
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