scholarly journals Development of a Numerical Model to Simulate Laser-Shock Paint Stripping on Aluminum Substrates

Aerospace ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 233
Author(s):  
Konstantinos Tserpes ◽  
Kosmas Papadopoulos ◽  
Selen Unaldi ◽  
Laurent Berthe
Keyword(s):  
Applied Pressure ◽  
Cohesive Zone Modeling ◽  
Fe Model ◽  
Laser Shock ◽  
Paint Stripping ◽  
Zone Modeling ◽  
Paint Thickness ◽  
Face Velocity ◽  
Experimental Findings ◽  
Aluminum Substrates

An explicit 3D Finite Element (FE) model was developed in the LS-Dyna code to simulate the laser shock paint stripping on aircraft aluminum substrates. The main objective of the model is to explain the physical mechanisms of the laser shock stripping process in terms of shock wave propagation, stress and strain evolution and stripping shape and size and to evaluate the effects of laser and material parameters on the stripping pattern. To simulate the behavior of aluminum, the Johnson–Cook plasticity model and the Gruneisen equation of state were applied. To simulate stripping, the cohesive zone modeling method was applied. The FE model was compared successfully against experiments in terms of back-face velocity profiles. The parameters considered in the study are the aluminum thickness, the epoxy paint thickness, the laser spot diameter, the fracture toughness of the aluminum/epoxy interface and the maximum applied pressure. In all cases, a circular solid or hollow stripping pattern was predicted, which agrees with the experimental findings. All parameters were found to affect the stripping pattern. The numerical results could be used for the design of selective laser shock stripping tests.

scholarly journals Selected Aspects of Cohesive Zone Modeling in Fracture Mechanics

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 302
Author(s):  
Wiktor Wciślik ◽  
Tadeusz Pała
Keyword(s):  
Cohesive Zone ◽  
Mixed Mode ◽  
Review Paper ◽  
Failure Process ◽  
Cohesive Zone Modeling ◽  
Mixed Mode Loading ◽  
Cohesive Models ◽  
Cohesive Modeling ◽  
Zone Modeling ◽  
Intensive Development

This review paper discusses the basic problems related to the use of cohesive models to simulate the initiation and development of failure in various types of engineering issues. The most commonly used cohesive zone models (CZMs) are described. Recent achievements in the field of cohesive modeling are characterized, with particular emphasis on the problem of mixed mode loading, the influence of the strain rate, the stress state triaxiality, and fatigue. A separate chapter of the work is devoted to the identification of cohesive parameters. Examples of the use of CZMs for the analysis of the fracture and failure process in various applications, both on the macro and microscopic scale, are given. The directions of CZMs development were indicated as well as the issues that are currently under particularly intensive development.

scholarly journals Cohesive Zone Modeling for Predicting Interfacial Delamination in over mold Components

2021 ◽  
Vol 1128 (1) ◽  
pp. 012018
Author(s):  
M Sai Krishnan ◽  
S Jeyanthi ◽  
Pradeep Kumar Mani ◽  
K T Hareesh ◽  
M. C Lenin Babu
Keyword(s):  
Cohesive Zone ◽  
Cohesive Zone Modeling ◽  
Interfacial Delamination ◽  
Zone Modeling

NUMERICAL SIMULATION AND TESTING OF A COMPOSITE-STIFFENED STRUCTURE UNDER COMBINED BUCKLING LOADS

2010 ◽  
Vol 10 (04) ◽  
pp. 871-884 ◽  
Author(s):  
E. KARACHALIOS ◽  
C. VRETTOS ◽  
Z. MARIOLI-RIGA ◽  
C. BISAGNI ◽  
P. CORDISCO ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fe Model ◽  
Release Rates ◽  
Actual Structure ◽  
Physical Test ◽  
Buckling Behavior ◽  
Energy Release Rates ◽  
Experimental Findings ◽  
Teflon Film ◽  
Level Of Agreement

Prediction of the buckling behavior of structures is of great interest in the aerospace industry, and extensive research is taking place worldwide in that area. The current work concerns numerical simulation of the collapse test of a closed stiffened composite box subjected to compression followed by torsion. Numerical simulation is performed and the results are correlated with experimental findings. The objective is to validate the numerical model and detect any deficiencies of the modeling procedure. For this purpose, a series of quantities numerically predicted are directly compared with experimental ones: strains, displacements, deformation plots and load–displacement curves. The physical test article also contains artificial stringer–skin debondings realized via Teflon film inserts. The energy release rates are calculated at the debonding front using the virtual crack closure technique. The FE model is slightly stiffer than the actual structure but the numerical results are at a reasonable level of agreement with the experimental data.

Failure simulation in resistance spot-welded lap-joints using cohesive zone modeling

2018 ◽  
Vol 25 (11) ◽  
pp. 2567-2577 ◽  
Author(s):  
Mohammad Ali Saeimi Sadigh ◽  
Gholamreza Marami ◽  
Bahman Paygozar
Keyword(s):  
Cohesive Zone ◽  
Lap Joints ◽  
Cohesive Zone Modeling ◽  
Resistance Spot ◽  
Failure Simulation ◽  
Zone Modeling ◽  
Spot Welded

Evaluation of Adhesive Joints of Two Different Materials

2012 ◽  
Author(s):  
M. M. Islam ◽  
Rakesh K. Kapania
Keyword(s):  
Finite Element ◽  
Dissimilar Materials ◽  
Element Model ◽  
Lap Joints ◽  
Adhesive Joints ◽  
Cohesive Zone Modeling ◽  
Stress Distributions ◽  
Test Fixture ◽  
Zone Modeling ◽  
Nonlinear Finite Element Model

In a test-fixture that the authors were using, steel tabs adhesively bonded to an aluminum panel debonded before the design load on the real test panel was fully applied. Therefore, studying behavior of adhesive joints for joining dissimilar materials was deemed to be necessary. To determine the failure load responsible for debonding of adhesive joints of two dissimilar materials, stress distributions in adhesive joints as obtained by a nonlinear finite element model of the test-fixture were studied under a gradually increasing compression-shear load. It was observed that in-plane stresses were responsible for the debonding of the steel tabs. To achieve a better understanding of adhesive joints of dissimilar materials, finite element models of adhesive lap joints and Asymmetric Double Cantilever Beam (ADCB) were studied, under loadings similar to the loading faced by the test-fixture. The analysis was performed using ABAQUS, a commercially available software, and the cohesive zone modeling was used to study the debonding growth.

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