Numerical Analysis of Fracture of Pre-stressed Ferroelectric Actuator Taking into Account Cohesive Zone for Damage Accumulation

2016 ◽  
pp. 23-39 ◽  
Author(s):  
Sergii Kozinov ◽  
Meinhard Kuna
Keyword(s):  
Numerical Analysis ◽  
Cohesive Zone ◽  
Damage Accumulation

A Quasi-Static Delamination Model with Rate-Dependent Interface Damage Exposed to Cyclic Loading

2018 ◽  
Vol 774 ◽  
pp. 84-89 ◽  
Author(s):  
Roman Vodička ◽  
Katarína Krajníková
Keyword(s):  
Numerical Analysis ◽  
Cyclic Loading ◽  
Cohesive Zone ◽  
Cyclic Load ◽  
Cohesive Zone Model ◽  
Zone Model ◽  
Interface Damage ◽  
Domain Structures ◽  
Rate Dependent ◽  
Damage Process

A model for numerical analysis of interface damage which leads to interface crack initiationand propagation in multi-domain structures under cyclic loading is considered. Modelling of damagetakes into account various relations between interface stresses and displacement gaps providing theresponse of a cohesive zone model, additionally equipped by a kind of viscosity associated to theevolution of the interface damage. Together with repeating loading-unloading conditions, it makesthis damage process to have a fatigue-like character, where the crack appears for smaller magnitudeof the cyclic load than for pure uploading.

scholarly journals Fatigue Life Assessment of Selected Structural Elements of MI-24 Helicopter

2010 ◽  
Vol 2010 (2) ◽  
pp. 5-13 ◽  
Author(s):  
Robert Baraniecki ◽  
Małgorzata Kaniewska ◽  
Andrzej Leski
Keyword(s):  
Fatigue Life ◽  
Numerical Analysis ◽  
Damage Accumulation ◽  
Life Assessment ◽  
Structural Elements ◽  
Fatigue Life Assessment

Fatigue Life Assessment of Selected Structural Elements of MI-24 Helicopter In order to ensure the integrity of the structure, it is important to determine the actual loads that act on individual elements and their influence on fatigue life. The article demonstrates how to determine the fatigue life of selected elements of the Mi-24 helicopter. In addition, the work indicates the potential location of damage. In calculations, the actual levels of loads acting on the elements during the flight were used. The entire test was performed using the numerical analysis, which greatly helped reduce the time of the project. Fatigue life was determined using the MSC. FATIGUE program with the Palmgren - Miner linear damage accumulation rule.

Numerical Analysis of GFRP Interposed Lamella Effect on the Structural Behavior of Timber Beams

2017 ◽  
Vol 21 ◽  
pp. 234-241
Author(s):  
Emanuela Decher ◽  
Cristina E. Lanivschi ◽  
Gabriela Maria Atanasiu
Keyword(s):  
Numerical Analysis ◽  
Cohesive Zone ◽  
Failure Modes ◽  
Reference Beam ◽  
Material Model ◽  
Separation Distance ◽  
Civil Structures ◽  
Efficient Tool ◽  
Linear Elastic ◽  
Timber Beams

The use of numerical methods to simulate materials or civil structures behavior is an efficient tool to predict their performance in diverse specific applications and design situations. The authors propose a set of numerical parameters able to describe the effect of the two interposed GFRP lamellae on a structural member composed of three wood battens connected lengthwise with mechanical fasteners, further considered as the reference beam. The numerical simulation is carried out in several steps. Firstly, the numerical model is calibrated with the experimental test of the reference beam. Secondly, the two GFRP lamellae are introduced between the timber members and the stress state and deformations both in cross-section`s components and at their interface are examined. The material models used in simulations were chosen according to the type of efforts that occur in timber beams and their failure modes when subjected to bending. For the timber components an orthotropic material model was considered. For the GFRP components linear elastic until failure material model was introduced. The interfaces between timber/GFRP lamellae were modeled by using cohesive zone material model with separation-distance based debonding. The results show a good correlation with those experimentally obtained and the parameters provided by this numerical analysis may be reliably used for specific design situations.

scholarly journals Cohesive Zone Model Based Numerical Analysis of Steel-Concrete Composite Structure Push-Out Tests

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
J. P. Lin ◽  
J. F. Wang ◽  
R. Q. Xu
Keyword(s):  
Numerical Analysis ◽  
Cohesive Zone ◽  
Composite Structures ◽  
Cohesive Zone Model ◽  
Constitutive Relations ◽  
Shear Stiffness ◽  
Shear Capacity ◽  
Zone Model ◽  
Shear Connectors ◽  
Push Out

Push-out tests were widely used to determine the shear bearing capacity and shear stiffness of shear connectors in steel-concrete composite structures. The finite element method was one efficient alternative to push-out testing. This paper focused on a simulation analysis of the interface between concrete slabs and steel girder flanges as well as the interface of the shear connectors and the surrounding concrete. A cohesive zone model was used to simulate the tangential sliding and normal separation of the interfaces. Then, a zero-thickness cohesive element was implemented via the user-defined element subroutine UEL in the software ABAQUS, and a multiple broken line mode was used to define the constitutive relations of the cohesive zone. A three-dimensional numerical analysis model was established for push-out testing to analyze the load-displacement curves of the push-out test process, interface relative displacement, and interface stress distribution. This method was found to accurately calculate the shear capacity and shear stiffness of shear connectors. The numerical results showed that the multiple broken lines mode cohesive zone model could describe the nonlinear mechanical behavior of the interface between steel and concrete and that a discontinuous deformation numerical simulation could be implemented.

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