Numerical Comparison of Global and Local Fracture Criteria in Compact Tension and Center-Crack Panel Specimens

2009 ◽  
pp. 24-24-16
Author(s):  
F Mudry ◽  
F di Rienzo ◽  
A Pineau
Keyword(s):  
Compact Tension ◽  
Numerical Comparison ◽  
Fracture Criteria ◽  
Local Fracture ◽  
Center Crack ◽  
Global And Local

Local fracture criteria : Lengthscales and applications

1998 ◽  
Vol 08 (PR8) ◽  
pp. Pr8-349-Pr8-356 ◽  
Author(s):  
T. Siegmund ◽  
W. Brocks
Keyword(s):  
Fracture Criteria ◽  
Local Fracture

Fracture in human cortical bone: local fracture criteria and toughening mechanisms

2005 ◽  
Vol 38 (7) ◽  
pp. 1517-1525 ◽  
Author(s):  
R.K. Nalla ◽  
J.S. Stölken ◽  
J.H. Kinney ◽  
R.O. Ritchie
Keyword(s):  
Cortical Bone ◽  
Fracture Criteria ◽  
Local Fracture ◽  
Toughening Mechanisms ◽  
Human Cortical Bone

Fracture Analysis of Piezoceramic CT-Specimen for Different Types of Crack Face Boundary Conditions

2015 ◽  
Vol 725-726 ◽  
pp. 949-954
Author(s):  
Ilia V. Ivashov ◽  
Artem S. Semenov
Keyword(s):  
Boundary Conditions ◽  
Piezoelectric Materials ◽  
Compact Tension ◽  
Fracture Criteria ◽  
Lifetime Estimation ◽  
Crack Face ◽  
Fracture Parameters ◽  
Different Types ◽  
Electromechanical Loading ◽  
The Moment

At the moment a problem of fracture and lifetime estimation for piezoelectric materials is not completely solved. The paper considers fundamentals of linear fracture electromechanics, fracture parameters and fracture criteria. The main difference from linear mechanics is crack face boundary conditions taking into account relative permeability of media inside the crack gap and coulomb traction. Different types of crack face boundary conditions and their numerical implementation are described. The paper presents results of finite element modeling of fracture toughness experiments on the compact tension specimens under combined electromechanical loading. Different types of crack face boundary conditions were tested and comparison of fracture parameters and fracture criteria was carried out.

On a Study of the Use of the (T˙) Integral in Fracture Analysis of Solids With Inelastic Rate-Constitutive Laws

1982 ◽  
Vol 104 (4) ◽  
pp. 331-337 ◽  
Author(s):  
M. Nakagaki ◽  
S. N. Atluri
Keyword(s):  
Plastic Material ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Constitutive Law ◽  
Fracture Criteria ◽  
Elastic Plastic ◽  
Infinitesimal Deformations ◽  
History Of ◽  
Elastic Plastic Material ◽  
Radial Loading

Here, the following topics are discussed: (i) a new integral (ΔT1) of relevance in the presence of cracks in an elastic-plastic material characterized by a rate-independent incremental constitutive law under the assumption of infinitesimal deformations, (ii) the conditions for path-independency of this integral, (iii) the physical meaning of (ΔT1) whether or not it is path-independent, (iv) its relation to J under conditions of radial loading when deformation theory of plasticity may be valid. The features of this new parameter (ΔT1) are brought out in a numerical solution of a compact tension specimen which is subject to a history of (displacement-controlled) loading/unloading/reloading. The implications of the present results in the context of more rational elastic-plastic fracture criteria are briefly discussed.

Effect of stacking sequence and geometric scaling on the brittleness number of glass fiber composite laminate with stress raiser

2014 ◽  
Vol 21 (2) ◽  
pp. 281-288 ◽  
Author(s):  
Y. Mohammed ◽  
Mohamed K. Hassan ◽  
Abu El-Ainin H ◽  
A.M. Hashem
Keyword(s):  
Glass Fiber ◽  
Composite Laminates ◽  
Fiber Composite ◽  
Stress Raiser ◽  
Compact Tension ◽  
Tension Test ◽  
Center Crack ◽  
Nominal Strength ◽  
Geometric Scaling ◽  
Brittleness Number

AbstractThe fracture behavior of quasi-brittle material exhibits commonly brittle behavior with some ductility in the fracture processing zone. Therefore, a matrix of experimental works is performed to investigate the failure behaviors based on a parameter known as brittleness number, which is a measure of brittle behaviors. Glass fiber-reinforced epoxy laminates of three stacking sequences, cross-ply [0/90]2s and two quasi-isotropic [0/45/90]2s and [0/45/90/-45]s, are manufactured using hand lay-up technique. A matrix of different specimen geometric scaling with open hole of the same material is used. The fracture energy GIC and nominal strength of these composite laminates are measured experimentally using compact tension test, center crack specimen, and tension test, respectively. The results showed that the increase of homogeneity of composite laminates, which is introduced by inserting a certain angle ply for the laminate structure, enhanced the material ductility as the brittle number increased. The larger size of specimen leads to the increase of brittleness for the same stacking sequences due to the increase of stress concentration factor.

An Examination of a Proposed Method for Evaluating Nonlinear Effects in Fracture Assessment

1976 ◽  
Vol 98 (1) ◽  
pp. 40-45
Author(s):  
N. J. I. Adams ◽  
H. G. Munro
Keyword(s):  
Simple Model ◽  
Correction Factor ◽  
Nonlinear Behavior ◽  
Nonlinear Effects ◽  
Compact Tension ◽  
Experimental Results ◽  
Specimen Length ◽  
Center Crack ◽  
Fracture Assessment ◽  
Specific Material

A proposal put forward by Liebowitz and Eftis suggests a method of accounting for nonlinear behavior observed in fracture. A simple model analysis of a center crack sheet and supporting experimental results, indicate that the corrected toughness based on load point displacement will not be single valued for a specific material. It is established that both the correction factor and deviation from linearity due to cracktip yielding vary with specimen length. Additionally, tests on compact tension specimens indicate that difficulties exist when trying to correlate corrected toughness values from one specimen configuration to another.

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