scholarly journals Assessment of mesh dependency in the numerical simulation of compact tension tests for orthotropic materials

2020 ◽  
Vol 1 ◽  
pp. 100006
Author(s):  
B. Lopes ◽  
M.R.T. Arruda ◽  
L. Almeida-Fernandes ◽  
L. Castro ◽  
N. Silvestre ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Compact Tension ◽  
Orthotropic Materials ◽  
Mesh Dependency ◽  
Tension Tests

Experimental study of damage propagation in Over-height Compact Tension tests

2009 ◽  
Vol 40 (12) ◽  
pp. 1891-1899 ◽  
Author(s):  
Xiangqian Li ◽  
Stephen R. Hallett ◽  
Michael R. Wisnom ◽  
Navid Zobeiry ◽  
Reza Vaziri ◽  
...  
Keyword(s):  
Experimental Study ◽  
Compact Tension ◽  
Damage Propagation ◽  
Tension Tests

Experimental and Numerical Study of Ductile Fracture Initiation in Aluminum 6061-T6

2015 ◽  
Author(s):  
W. Rekik ◽  
O. Ancelet ◽  
C. Gardin
Keyword(s):  
Numerical Simulation ◽  
Ductile Fracture ◽  
Void Growth ◽  
Numerical Study ◽  
Micromechanical Model ◽  
Stress Triaxiality ◽  
Fracture Initiation ◽  
Compact Tension ◽  
Growth Ratio ◽  
Ductile Fracture Initiation

This work deals with the characterization of ductile damage in Aluminum 6061-T6 alloy. In this paper we discuss the stress triaxiality effect on the initiation and the evolution of damage through a sequence of tensile tests conducted on round specimens with different rate of trixialities and tearing tests on precracked Compact Tension specimens. Scattering of ductility and toughness values was highlighted between the three characteristic directions studied in this topic. Based on the experimental results, numerical simulation has been performed in order to analyze and predict ductile fracture initiation of this aluminum alloy by simulating void growth according to the Rice-Tracey micromechanical model. The numerical simulation was conducted in two steps: first the critical void growth ratio (R / R0)c was evaluated for tensile cylindrical specimens with different degrees of triaxiality and then used to analyze crack growth initiation on Compact Tension specimen. Due to the Al-6061-T6 highly sensitivity to triaxiality, a necessary adaptation of the Rice-Tracey model’s coefficient was made.

Compact tension specimen for orthotropic materials

2014 ◽  
Vol 63 ◽  
pp. 85-93 ◽  
Author(s):  
A. Ortega ◽  
P. Maimí ◽  
E.V. González ◽  
Ll. Ripoll
Keyword(s):  
Compact Tension ◽  
Compact Tension Specimen ◽  
Orthotropic Materials ◽  
Tension Specimen

Fracture Toughness of PIR Foams Produced from Renewable Resources

2012 ◽  
Vol 525-526 ◽  
pp. 29-32 ◽  
Author(s):  
Janis Andersons ◽  
E. Spārniņš ◽  
Ugis Cabulis ◽  
U. Stirna
Keyword(s):  
Fracture Toughness ◽  
Renewable Resources ◽  
Petrochemical Industry ◽  
Compact Tension ◽  
Environmental Benefits ◽  
Insulation Material ◽  
Renewable Materials ◽  
Tension Tests ◽  
Closed Cell ◽  
Rise Direction

Rigid low-density closed-cell polyisocyanurate (PIR) foams are used primarily as a thermal insulation material. Traditionally, they are manufactured from constituents produced by petrochemical industry. Introducing renewable materials in PIR formulation brings definite economical and environmental benefits. Fracture toughness of PIR foams obtained from renewable resources (with the polyol system comprising up to 80% of rapeseed oil esters) and petrochemical PIR foams has been characterized experimentally, by compact tension tests, for mode I crack propagation along the rise direction of the foams.

Effects of the Hygrothermal Conditions on the Fracture Energy of the Concrete

2016 ◽  
Vol 711 ◽  
pp. 397-403
Author(s):  
Hatem Kallel ◽  
Hélène Carré ◽  
Christian Laborderie ◽  
Benoît Masson ◽  
Nhu Cuong Tran
Keyword(s):  
Fracture Energy ◽  
Mechanical Behaviour ◽  
Water Saturation ◽  
Compact Tension ◽  
Severe Accident ◽  
Temperature Level ◽  
Accurate Knowledge ◽  
Tension Tests ◽  
Experimental Apparatus ◽  
Temperature Levels

The scenario of a severe accident in the containment building of a nuclear plant results in an increase in pressure, temperature and relative humidity that can reach respectively 5 bars, 140 °C and the saturation of water vapour. As well as the regulatory calculations, accurate knowledge of the thermal and mechanical behaviour of materials and more specifically of concrete is required to carry out more precise numerical simulations. Our study aims to investigate the mechanical behaviour of concrete under homogeneous conditions of moisture and temperature. An experimental apparatus was designed in order to assess the evolutions of the fracture energy of concrete. Different temperature levels up to a maximum of 110 °C and at different values of the controlled moisture content were investigated. The equipment was used to perform DCT (Disk-shape Compact Tension) tests at 30, 90 and 110 °C. Five levels of degree of liquid water saturation (Sw) were investigated for each temperature level.

About Elastoplastic Nonlocal Formulations with Damage Gradients

2009 ◽  
Vol 20 (6) ◽  
pp. 845-875 ◽  
Author(s):  
D. Sornin ◽  
K. Saanouni
Keyword(s):  
Mesh Size ◽  
Industrial Applications ◽  
Nonlocal Damage ◽  
Damage Models ◽  
Mesh Dependency ◽  
Tension Tests ◽  
Simple Tension ◽  
Elastoplastic Damage

FEM results of softening materials are well known to show pathological mesh dependency. The main goal of this work is to revisit and propose efficient nonlocal damage gradient enhanced formulations able to avoid mesh dependency in the context of elastoplastic damage models with destination to industrial applications. This formulation is presented and studied for simple tension tests, with various spatial discretizations. Numerical aspects and implementation in ABAQUS-standard environment are discussed. The structure of the nonlocal element needed for those formulations is presented. For a given set of meshes, the ability of the proposed formulation to control the size of the necking zone is studied. In the same time the independence of the global dissipation to the mesh size is checked. Theoretical and practical limits of the proposed approach are highlighted.

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