Efficient and accurate determination of mode I type 3-D surface crack by measuring strain around the crack on the idea of the body force method

1995 ◽  
Vol 72 (4) ◽  
pp. 343-358 ◽  
Author(s):  
Dai-Heng Chen ◽  
Nao-Aki Noda ◽  
Kazuhiro Oda ◽  
Shoji Harada
Keyword(s):  
Surface Crack ◽  
Body Force ◽  
Accurate Determination ◽  
The Body ◽  
Mode I ◽  
Force Method ◽  
Body Force Method ◽  
Type 3

Stress-Intensity Factors for an Internal Semi-Elliptical Surface Crack in Cylindrical Pressure Vessels

1995 ◽  
Vol 117 (3) ◽  
pp. 213-221 ◽  
Author(s):  
D.-H. Chen ◽  
H. Nisitani ◽  
K. Mori
Keyword(s):  
Surface Crack ◽  
Body Force ◽  
Crack Problem ◽  
Pressure Vessels ◽  
The Body ◽  
Intensity Factors ◽  
Infinite Body ◽  
Force Method ◽  
Body Force Method ◽  
Point Forces

In this paper, the surface crack problem in a cylinder subjected to internal pressure is solved. The analysis is based on the body force method, but it is different from the conventional body force method in the following point. That is, the body forces to be distributed continuously on the assumed boundaries in an infinite body are approximated by some discrete point forces acting on the outside of the assumed boundaries. By using this method combined with the resultant force boundary conditions, solutions with high accuracy are obtained.

Assessment Procedure for Multiple Volumetric Flaws in p-M Diagram

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Shinji Konosu
Keyword(s):  
Body Force ◽  
Pressure Vessels ◽  
The Body ◽  
Assessment Procedure ◽  
Force Method ◽  
Reference Stress ◽  
Body Force Method ◽  
Common Problems ◽  
Shielding Effects

Assessment of multiple volumetric flaws is one of the most common problems relating to pressure vessels and piping components. Under the current fitness for service rules, such as ASME, BS, and so on, multiple volumetric flaws are usually recharacterized as an enveloping volumetric flaw (defined as a single larger volumetric flaw) as well as multiple cracklike flaws, following their assessment rules. However, the rules proposed in their codes will not often agree and their justification is unknown. Furthermore, they can provide unrealistic assessment in some cases. In this paper, the interaction between two differently sized nonaligned volumetric flaws such as local thin areas is clarified by applying the body force method. Unlike multiple cracklike flaws, the effect of biaxial stresses on the interaction is evident. Based on the interaction that indicates the magnification and shielding effects and reference stress solutions, a new procedure for multiple volumetric flaws is proposed for assessing the flaws in the p-M (pressure-moment) diagram, which is a simple assessment procedure for vessels with volumetric flaws.

Simplification of the body force method by using the approximated boundaries composed of triangular surfaces.

1988 ◽  
Vol 54 (508) ◽  
pp. 2093-2098
Author(s):  
Hironobu NISITANI ◽  
Hiroshi NOGUCHI ◽  
Dai-heng CHEN ◽  
Hiroaki MINE
Keyword(s):  
Body Force ◽  
The Body ◽  
Force Method ◽  
Body Force Method
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