Numerical Determination of Delamination Onset in Laminated Symmetric DCB Specimen

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

محمود مهرداد شکریه ¹ , محمد حیدری رارانی ² , سجاد رحیمی ³

1 - استاد، آزمایشگاه تحقیقاتی کامپوزیت، قطب علمی مکانیک جامدات تجربی و دینامیک، دانشکدة مهندسی مکانیک، دانشگاه علم و صنعت ایران
2 - دانشجوی دکتری، آزمایشگاه تحقیقاتی کامپوزیت، قطب علمی مکانیک جامدات تجربی و دینامیک، دانشکدة مهندسی مکانیک، دانشگاه علم و صنعت ایران
3 - کارشناس ارشد، آزمایشگاه تحقیقاتی کامپوزیت، قطب علمی مکانیک جامدات تجربی و دینامیک، دانشکدة مهندسی مکانیک، دانشگاه علم و صنعت ایران

Received: 2015-09-30 Accepted : 2015-09-30 Published : 2009-12-22

Keywords: strain energy release rate, Delamination toughness, DCB specimen,

Abstract :

In this study, a novel numerical method is proposed for determination of mode-I interlaminar fracture toughness, GIc, in multi-directional (MD) double cantilever beam (DCB) specimens using fracture properties of unidirectional DCB specimens. Two factors, β and Dcare defined to minimize the undesirable effects on strain energy release rate. β describes the difference between maximum and average of SERR along the delamination front. Dcshows the bending-bending coupling of laminated composites. β and Dcfactors are not independent factors because both of them affect on distribution of SERR. As a result, by 3D modeling of DCB specimen in ANSYS software, limitation of β is determined so that the fracture toughness of MD DCB specimen with 0//0 interface can be predicted from toughness of unidirectional DCB specimen. Numerical results shows that fracture toughness predicted with the proposed approach is in good agreement with available experiments in the literature for β < 20%.

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