A displacement extrapolation method for determining the stress intensity factors along flaw border

1992 ◽  
Vol 57 (4) ◽  
pp. R51-R58 ◽  
Author(s):  
L. S. Chen ◽  
J. H. Kuang
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Extrapolation Method ◽  
Intensity Factors ◽  
Displacement Extrapolation Method ◽  
Displacement Extrapolation

scholarly journals Calculation of Stress Intensity Factor using Displacement Extrapolation Method in Peridynamic Framework

2020 ◽  
Vol 36 (2) ◽  
pp. 235-243
Author(s):  
N. Zhu ◽  
E. Oterkus
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Extrapolation Method ◽  
Benchmark Problems ◽  
Theory Approach ◽  
Intensity Factors ◽  
Element Analysis ◽  
Peridynamic Theory ◽  
Displacement Extrapolation Method ◽  
Displacement Extrapolation

ABSTRACTThis paper introduces a new approach to calculate stress intensity factors based on a combination of Displacement Extrapolation Method and Peridynamic Theory. After obtaining the displacement field from Peridynamic Theory, by appropriately selecting nodes at the crack tip region and their displacements yield stress intensity factors at the crack tips. To demonstrate the capability of the proposed approach, three different benchmark problems are considered including plate with a central crack, plate with an edge crack and plate with a slanted crack. Results evaluated from the current approach are compared against analytical and finite element analysis results, and good agreement is obtained between three different approaches. This shows that coupled Displacement Extrapolation Method and Peridynamic Theory approach can be an alternative method to calculate stress intensity factors.

scholarly journals The Effect of the Size and Position of the Crack on the Normalized Stress Intensity Factor

2020 ◽  
Vol 2 (01) ◽  
pp. 1-8
Author(s):  
Mostefa BENDOUBA ◽  
Abdelkader DJEBLI ◽  
Abdelghani BALTACH ◽  
Ali BENHAMENA ◽  
Amel BOUKHLIF ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Crack Size ◽  
Elastic Behavior ◽  
Intensity Factors ◽  
Nodal Displacement ◽  
Displacement Extrapolation Method ◽  
Calculation Code ◽  
Displacement Extrapolation

In this work, finite element method was used to determine the normalized stress intensity factors for different configurations. For this, a 2-D numerical analysis with elastic behavior was undertaken in pure I mode. This simulation was carried out using a numerical calculation code. On the basis of the numerical results obtained from the different models treated, there is a good correlation between the nodal displacement extrapolation method (DEM) and the energy method based on the Rice integral (J) to evaluate the normalized stress intensity factors and this for different crack lengths. For each configuration, the increase in the crack size causes an amplification of normalized intensity stresses fators.

scholarly journals Two-dimensional Numerical Estimation of Stress Intensity Factors and Crack Propagation in Linear Elastic Analysis

2013 ◽  
Vol 3 (5) ◽  
pp. 506-510
Author(s):  
A. Boulenouar ◽  
N. Benseddiq ◽  
M. Mazari
Keyword(s):  
Stress Intensity ◽  
Crack Propagation ◽  
Stress Intensity Factors ◽  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Intensity Factors ◽  
Linear Elastic ◽  
Straight Line ◽  
Displacement Extrapolation Method ◽  
Strain Energy Density Theory

When the loading or the geometry of a structure is not symmetrical about the crack axis, rupture occurs in mixed mode loading and the crack does not propagate in a straight line. It is then necessary to use kinking criteria to determine the new direction of crack propagation. The aim of this work is to present a numerical modeling of crack propagation under mixed mode loading conditions. This work is based on the implementation of the displacement extrapolation method in a FE code and the strain energy density theory in a finite element code. At each crack increment length, the kinking angle is evaluated as a function of stress intensity factors. In this paper, we analyzed the mechanical behavior of inclined cracks by evaluating the stress intensity factors. Then, we presented the examples of crack propagation in structures containing inclusions and cavities.

Numerical Determination of Stress Intensity Factors Using ABAQUS

2014 ◽  
Author(s):  
Xian-Kui Zhu
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Stress Intensity Factors ◽  
Three Dimensional ◽  
Pressure Vessels ◽  
Intensity Factors ◽  
Element Analysis ◽  
Linear Elastic ◽  
Displacement Extrapolation Method

Crack assessments for pressure vessels often need to quantify the crack driving force — stress intensity factor K with the linear-elastic fracture mechanics methods. Different numerical methods have been developed to calculate the stress intensity factors for complex cracks. Of which, four typical methods, i.e., the displacement extrapolation method, the virtual crack closure technique (VCCT), the J-integral conversion method, and the direct K output method are selected and evaluated in this paper using the finite element analysis (FEA) and ABAQUS software. The evaluations are performed based on the benchmark FEA calculations in the linear-elastic conditions for the central-cracked panel (CCP) specimen in the two-dimensional (2D) plane strain conditions. The “best method” is then determined and used to calculate the stress intensity factor for the CCP specimen with a through-thickness crack in the three-dimensional (3D) conditions. The results show that ABAQUS can simply determine very accurate K values for both 2D and 3D cracks.

DETERMINATION OF RESIDUAL STRESSES AND STRESS INTENSITY FACTORS BY REMOVING LOCAL MATERIAL

2017 ◽  
Vol 48 (4) ◽  
pp. 377-398
Author(s):  
Svyatoslav Igorevich Eleonskii ◽  
Igor Nikolaevich Odintsev ◽  
Vladimir Sergeevich Pisarev ◽  
Stanislav Mikhailovich Usov
Keyword(s):  
Stress Intensity ◽  
Residual Stresses ◽  
Stress Intensity Factors ◽  
Intensity Factors ◽  
Local Material
Sign in / Sign up

Export Citation Format

Share Document