On the robustness of finite element procedures based on Virtual Crack Closure Technique and fail release approach for delamination growth phenomena. Definition and assessment of a novel methodology

2010 ◽  
Vol 70 (8) ◽  
pp. 1288-1300 ◽  
Author(s):  
Elisa Pietropaoli ◽  
Aniello Riccio
Keyword(s):  
Finite Element ◽  
Crack Closure ◽  
Virtual Crack Closure Technique ◽  
Closure Technique ◽  
Delamination Growth

Design and finite element assessment of fully uncoupled multi-directional layups for delamination tests

2019 ◽  
Vol 54 (6) ◽  
pp. 773-790 ◽  
Author(s):  
Torquato Garulli ◽  
Anita Catapano ◽  
Daniele Fanteria ◽  
Julien Jumel ◽  
Eric Martin
Keyword(s):  
Finite Element ◽  
Crack Closure ◽  
Plate Theory ◽  
Closed Form Solution ◽  
Standard Test ◽  
Form Solution ◽  
Virtual Crack Closure Technique ◽  
Test Procedures ◽  
Closure Technique ◽  
Double Cantilever Beam Test

In this paper, a procedure to obtain fully uncoupled multi-directional stacking sequences for delamination specimens is outlined. For such sequences, in-plane, membrane-bending and torsion–bending coupling terms are null (in closed-form solution in the framework of classical laminated plate theory) for the entire stack and for both its halves, which form two arms in the pre-cracked region of a typical delamination specimen. This is achieved exploiting the superposition of quasi-trivial quasi-homogeneous stacking sequences, according to appropriate rules. Any pair of orientations of the plies embedding the delamination plane can be obtained. To assess the effectiveness of the proposed approach, a fully uncoupled multi-directional sequence is designed and compared to other relevant sequences proposed in the literature. Finite element simulations of double cantilever beam test are performed using classic virtual crack closure technique and a revised state-of-the-art virtual crack closure technique formulation too. Some interesting conclusions regarding proper design of multidirectional stacks for delamination tests are drawn. Moreover, the results confirm the suitability of fully uncoupled multi-directional sequences for delamination tests. Thanks to their properties, these sequences might lay the foundations for the development of standard test procedures for delamination in angle-ply interfaces.

Virtual Crack Closure Technique in the Analysis of Concrete Arch Dam Cracks

2013 ◽  
Vol 444-445 ◽  
pp. 1466-1470
Author(s):  
Dong Xu Wang ◽  
Liang Wu
Keyword(s):  
Finite Element ◽  
Crack Closure ◽  
Arch Dam ◽  
Virtual Crack Closure Technique ◽  
Closure Technique ◽  
Element Analysis ◽  
Interface Elements ◽  
Stress Energy ◽  
Calculation Results ◽  
New Ideas

In this paper, a 3-dimension finite element with dummy nodes for calculating and outputting the stress energy release (SERR) at the crack tip was built up based on virtual crack closure technique (VCCT), it is presented to demonstrate the virtual crack closure technique has high accuracy and good feasibility. The calculation results curve and the analytical solution curve are in good agreement. The results show that the proposed interface elements can be used to calculate to get accurate results by finite element analysis. It can give us some new ideas for Hydraulic structure crack research.

Comparative Analysis of Crack Growth Characteristics Based on Virtual Crack Closure Technique

2014 ◽  
Vol 633-634 ◽  
pp. 59-62
Author(s):  
Wen Lin Liu ◽  
Da Zhao Yu ◽  
Zhong Hu Jia
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Crack Closure ◽  
Element Model ◽  
Virtual Crack Closure Technique ◽  
Closure Technique ◽  
Engineering Structures ◽  
Finite Element Software ◽  
User Subroutine ◽  
The Finite Element Model

The strain energy rate and the stress intensity factors in different crack growth stage were analyzed by virtual crack closure technique. The user subroutine is complied using Abaqus finite element software. The finite element model of crack growth was established by the Paris formula, then the fatigue crack growth process is simulated, the crack growth life is predicted. The method could be a powerful tool for engineers to study the fracture and fatigue problems in engineering structures.

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