3 edition of **Stress-intensity factor calculations using the boundary force method** found in the catalog.

Stress-intensity factor calculations using the boundary force method

- 66 Want to read
- 2 Currently reading

Published
**1987**
by National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va
.

Written in English

- Boundary element methods.,
- Fracture mechanics.

**Edition Notes**

Other titles | Stress intensity factor calculations using the boundary force method. |

Statement | P.W. Tan, I.S. Raju, and J.C. Newman, Jr. |

Series | NASA technical memorandum -- 89158. |

Contributions | Raju, I. S., Newman, J. C., Langley Research Center. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL18034450M |

non-linear stress profiles, the stress intensity factor can also be calculated using the universal weight function method described in Xu et al. [3]. With this method, the stress profile is divided into several segments such that a piece-wise linear stress fit can be performed for each division. Based on the fitted stress distribution for each. The equations were based on stress-intensity factors obtained from three-dlmenslonal flnlte-element analyses [8, 9, 18, and 19] that cover a wide range of configuration parameters. In some configurations, the range of the equation was extended by using stress-intensity factor solutions for a through crack in a similar configuration. InFile Size: 1MB.

decrease in calculation efﬁciency. A dual boundary inte-gration method was developed to obtain dynamic stress intensity factors [Wen, Aliabadi, and Rooke ()]. Because the crack opening displacements are used to calculate stress intensity in this method, attention must be paid, and some techniques have to be used, to im-. @article{osti_, title = {Stress intensity factors}, author = {Murakami, Y.}, abstractNote = {This book provides a survey of the field of fracture mechanics, covering mixed-mode fracture, dynamic fracture, composite materials, residual stresses, welding and electromagnetic problems. It gives information on specific practical and theoretical problems and contains .

A new displacement-based approach to calculate stress intensity factors with the Boundary Element Method. Marco Gonzalez. a,*, Paulo Teixeira. a calculations have been developed, the J-integral method being one of the most widely used because of its energy-like formulation. Additionally, some variations of the J-integral method, suchas the. Stress Intensity Factor in Practice: Engineers are interested in the maximum stress near the crack tip and whether it exceeds the fracture toughness. Thus, the stress intensity factor K is commonly expressed in terms of the applied stresses at and.

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Get this from a library. Stress-intensity factor calculations using the boundary force method. [P W Tan; I S Raju; J C Newman; Langley Research Center.].

Calculate the stress under point load with no crack- use a book like ROARK for this. The stress intensity is given as stress = Ki/(y) (SQRT(C) where c is flaw depth and Y =for penny crack.

Thus Ki = (max stress without crack)(y)(sqrt(C)). If stress intensity is less than critical stress intensity factor, Kic. then it will not fail. An efficient boundary weight function method for the determination of stress intensity factors in a two-dimensional mixed mode cracked body with arbitrary shape and subjected to arbitrary loading is presented in this study.

The functional form of the boundary weight functions for modes I and II are successfully demonstrated by using the least squares Cited by: 3. This mesh-free technique presents good results when compared with the boundary element method and estimated solutions for the stress intensity factor calculations.

View Show abstract. The stress intensity factor, is used in fracture mechanics to predict the stress state ("stress intensity") near the tip of a crack or notch caused by a remote load or residual stresses.

It is a theoretical construct usually applied to a homogeneous, linear elastic material and is useful for providing a failure criterion for brittle materials, and is a critical technique in the discipline of. Stress intensity factors can be obtained from numerical calculations of the stress and displacement field near the crack.

Different methods, e.g., the finite element method or boundary element method, can be applied. Because of the elastic nature of the problem superposition of different loadings is possible.

A universal procedure is the weight. Computers FORCE LINEAR ELASTIC STRESS INTENSITY FACTOR CALCULATION USING BOUNDARY ELEMENT METHOD G. KARAMlf and G. KN Lehrstuhl f Technische Mechanik, Universit Erlangen-Nnberg, Germany (Received Cited by: 2. Katsareas and N. Anifantis, On the computation of mode I and II thermal shock stress intensity factors using a boundary‐only element method, International Journal for Numerical Methods in Engineering, 38, 24, (), ().

ASME axial Body Force Method Boundary correction factors Center cracked circular classical theory crack emanating crack front Crack Problems CRACK Reference crack subjected crack surface cracked rectangular plate cylindrical shell deformation theory dynamic stress intensity Elastic Solid Element Method Accuracy elliptic integral elliptical.

Eng Fract Mech ;69(7)– Dolbow J, Moës N, Belytschko T. An extended finite element method for modeling crack growth with frictional contact.

Comput Methods Appl Mech Eng ;(51)– Jia ZH, Shippy DJ, Rizzo FJ. On the computation of two-dimensional stress intensity factors using the boundary element method.

Keywords: Fracture mechanics, stress intensity factor, smoothed finite element method. Abstract. Accuracy of stress intensity factor (SIF) determination by three types of smooth finite el.

Stress intensity factors handbook. 1 () Analysis of Cracks Analysis of Stress Appl ASME ASTM ASTM STP Body Force Method Boundary correction factors Center cracked Central Crack -INFINITE PLANE Ser.E Shear modulus shear stress Specimens Stress Intensity Factors subjected to bending surface crack Table Boundary correction Table Stress 2/5(1).

Mi, Y. and Aliabadi, M.H. Dual boundary element method for three-dimensional fracture mechanics analysis. Engineering Analysis with Boundary Elements, Vol. [ Links ] Ortiz, J.E. and Cisilino, A.P. () Boundary element method for J-integral and stress intensity factor computations in three-dimensional interface : Marco Gonzalez, Paulo Teixeira, Luiz C.

Wrobel, Manuel Martinez. Stress intensity factor determination plays a central role in linearly elastic fracture mechanics (LEFM) problems.

Fracture propagation is controlled by the stress field near the crack tip. Because this stress field is asymptotic dominant or singular, it is characterized by the stress intensity factor (SIF).

Since many rock types show brittle elastic behaviour under hydrocarbon Cited by: 4. boundary element method 8,9, the meshless met11, the finite element method 5,and virtual crack extens The stress intensity factor for edge crack in finite plate can be.

The finite element method can be used effectively in the role of general stress intensity factor calculator. The method can accommodate virtually any actual situation involving non-standard geometry and boundary conditions, and include multiple cracks, multiple materials, material anisotropy, and initial stresses.

The external forces method is a numerical method for K calculation based on the finite element method. It uses the work of the external forces W for the calculation of the energy release rate and is particularly advantageous when that forces are applied far from the crack front.

The method was applied to a corner crack geometry with the objective of studying its by: Calculation of the stress intensity factor & (a) (b) Fig. (a) Geometry for a cracked body subjected to general boundary condition with a cut rectangular cracked plate containing a central crack; (b) Geometry of a rectangular cracked plate with a central crack as indicated in Fig.

1 a. The answers here already contain the correct idea. I’ll just expand on that below. First consider a conventional strength of materials approach. Let’s say we have within a structural member an elliptical hole of major axis 2a with radius of curvat.

stress intensity factor is dependent on geometry, the size and location of the crack, and the magnitude and distribution of loads on the structure. The scope of this thesis is the study of the through-thickness stress intensity factor using two different FE approaches.

P- and h-element finite element methods are used to study the stress Cited by: 1. The stress intensity factors K I and K II for an inclined central crack on a plate subjected to uniform tensile loading were calculated for different crack orientations (angles) using finite element (FE) analysis, which was carried out in ABAQUS.

The stress intensity factors were obtained using the J integral methodFile Size: KB.The application of this method to these equations leads to coupled sets of simultaneous ordinary differ-ential equations whose solutions are obtained along sets of lines in a discretized region.

Using the obtained displacement field, normal stresses and the stress intensity factor variation along the crack periphery are.quarter-point elements. Thermal dynamic stress intensity factor for mode I is evaluated using J-integral method. By using J-integral method effects of inertia term and other terms such as strain energy on stress intensity factor may be investigated separately and their importance may be shown.

The accuracy of theCited by: