scholarly journals Overcoming the cohesive zone limit in composites delamination: modeling with slender structural elements and higher‐order adaptive integration

2020 ◽  
Vol 121 (24) ◽  
pp. 5511-5545
Author(s):  
Raffaele Russo ◽  
Boyang Chen
Keyword(s):  
Cohesive Zone ◽  
Higher Order ◽  
Structural Elements ◽  
Adaptive Integration

Numerical study for cohesive zone model in delamination analysis based on higher-order B-spline functions

2017 ◽  
Vol 02 (01) ◽  
pp. 1750004 ◽  
Author(s):  
Tran Quoc Thai ◽  
Timon Rabczuk ◽  
Xiaoying Zhuang
Keyword(s):  
Cohesive Zone ◽  
Cohesive Zone Model ◽  
Numerical Study ◽  
Higher Order ◽  
Integration Scheme ◽  
Spline Functions ◽  
Zone Model ◽  
Equilibrium Path ◽  
Arc Length ◽  
B Spline

A numerical aspect of the implementation cohesive zone model for delamination analysis is presented in this work by employing interface elements and higher-order B-spline functions. The stress oscillation is addressed, and Newton–Cotes integration scheme is considered as a good candidate to overcome this phenomenon. In order to track the nonlinear equilibrium path, a general arc-length constraint named dissipation-based arc-length method is applied. A numerical example is presented to perform the ability of the formulation in predicting the delamination behavior of studied structures.

Cohesive-zone models, higher-order continuum theories and reliability methods for computational failure analysis

2004 ◽  
Vol 60 (1) ◽  
pp. 289-315 ◽  
Author(s):  
René de Borst ◽  
Miguel A. Gutiérrez ◽  
Garth N. Wells ◽  
Joris J. C. Remmers ◽  
Harm Askes
Keyword(s):  
Failure Analysis ◽  
Cohesive Zone ◽  
Higher Order ◽  
Cohesive Zone Models ◽  
Reliability Methods ◽  
Continuum Theories

scholarly journals Shape Synthesis in Mechanical Design

10.14311/1010 ◽  
2007 ◽  
Vol 47 (6) ◽  
Author(s):  
C. P. Teng ◽  
S. Bai ◽  
J. Angeles
Keyword(s):  
Mechanical Design ◽  
Higher Order ◽  
Cubic Splines ◽  
Structural Elements ◽  
Surfaces Of Revolution ◽  
Stress Concentrations ◽  
Smooth Curves ◽  
Geometric Shapes ◽  
Geometric Primitives ◽  
Non Parametric

The shaping of structural elements in the area of mechanical design is a recurrent problem. The mechanical designer, as a rule, chooses what is believed to be the “simplest” shapes, such as the geometric primitives: lines, circles and, occasionally, conics. The use of higher-order curves is usually not even considered, not to speak of other curves than polynomials. However, the simplest geometric shapes are not necessarily the most suitable when the designed element must withstand loads that can lead to failure-prone stress concentrations. Indeed, as mechanical designers have known for a while, stress concentrations occur, first and foremost, by virtue of either dramatic changes in curvature or extremely high values thereof. As an alternative, we propose here the use of smooth curves that can be simply generated using standard concepts such as non-parametric cubic splines. These curves can be readily used to produce either extruded surfaces or surfaces of revolution. 

Numerical Optimization of Hybrid Panel Joints by Mixed Adhesive/Welded Method on Shipbuilding

2018 ◽  
Author(s):  
Mario de Vicente
Keyword(s):  
Cohesive Zone ◽  
Numerical Optimization ◽  
Cohesive Zone Model ◽  
Zone Model ◽  
Structural Method ◽  
Structural Elements ◽  
Shipbuilding Industry ◽  
Qualified Personnel ◽  
The Impact ◽  
Difficult Part

The structural method for shipbuilding remains invariant for a century, the introduction of light materials in other fields, aeronautics and automotive, involves saving weight without risking structure failures. The most difficult part is to incorporate these materials in the shipbuilding industry, because the impact in cost and qualified personnel remains as a handicap. The purpose of this study is to review the shipbuilding process specifically the joints between hybrid panels and primary structural elements without a high cost in resources or material. A honeycomb core sandwich is used as a hybrid material, and the optimized mixed joint is raw steel, the clamp is directly welded to the primary members, glued to the panel with two adhesive strengths, and the mathematical formula used to simulate the debonding at the interface is based on the Cohesive Zone Model, proposed by Al-fano and Crisfield. The numerical simulation analyses consist in topological and parametric optimization, and debonding effects are simulated using contact non-linearity and fracture mechanics approaches.

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