Notch-Tip Stresses and Strains Under Nonproportional Loading

2009 ◽  
pp. 131-131-25
Author(s):  
MNK Singh ◽  
G Glinka ◽  
RN Dubey
Keyword(s):  
Nonproportional Loading ◽  
Notch Tip

Ductile Crack Extension Analysis for X80 Bending Deformation Using Damage-Based Model

2014 ◽  
Author(s):  
Satoshi Igi ◽  
Mitsuru Ohata ◽  
Takahiro Sakimoto ◽  
Kenji Oi ◽  
Joe Kondo
Keyword(s):  
Plastic Strain ◽  
Simulation Model ◽  
Crack Growth ◽  
Crack Extension ◽  
Damage Model ◽  
Stress Triaxiality ◽  
Crack Growth Behavior ◽  
Ductile Crack ◽  
Ductile Crack Growth ◽  
Notch Tip

This paper presents experimental and analytical results focusing on the strain limit of X80 linepipe. Ductile crack growth behavior from a girth weld notch is simulated by FE analysis based on a proposed damage model and is compared with the experimental results. The simulation model for ductile crack growth accompanied by penetration through the wall thickness consists of two criteria. One is a criterion for ductile crack initiation from the notch-tip, which is described by the plastic strain at the notch tip, because the onset of ductile cracking can be expressed by constant plastic strain independent of the shape and size of the components and the loading mode. The other is a damage-based criterion for simulating ductile crack extension associated with damage evolution influenced by plastic strain in accordance with the stress triaxiality ahead of the extending crack tip. The proposed simulation model is applicable to prediction of ductile crack growth behaviors from a circumferentially-notched girth welded pipe with high internal pressure, which is subjected to tensile loading or bending (post-buckling) deformation.

scholarly journals Slip lines in front of a round notch tip in a pressure-sensitive material

1994 ◽  
Vol 19 (1) ◽  
pp. 29-38 ◽  
Author(s):  
H.-Y. Jeong ◽  
X.-W. Li ◽  
A.F. Yee ◽  
J. Pan
Keyword(s):  
Sensitive Material ◽  
Slip Lines ◽  
Pressure Sensitive ◽  
Notch Tip

scholarly journals Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Lijun Zhang ◽  
Shengdun Zhao ◽  
Zhenwei Wang
Keyword(s):  
Crack Initiation ◽  
Equivalent Stress ◽  
Initiation Time ◽  
Initiation Point ◽  
Change Rate ◽  
Crack Initiation Angle ◽  
Notch Tip ◽  
Crack Initiation Life ◽  
Microscopic Measurement ◽  
Displacement Extrapolation Method

The crack initiation of V-shaped notch tip has a very important influence on the cross-section quality and the cropping time for every segment of metal bar in course of low stress precision cropping. By the finite element method, the influence of machining precision of V-shaped notch bottom corner on the crack initiation location is analyzed and it is pointed out that the crack initiation point locates in the place at the maximal equivalent stress change rate on V-shaped notch surface. The judgment criterion of the crack initiation direction is presented and the corresponding crack initiation angle can be calculated by means of the displacement extrapolation method. The factual crack initiation angle of the metal bar has been measured by using the microscopic measurement system. The formula of the crack initiation life of V-shaped notch tip is built, which mainly includes the stress concentration factor of V-shaped notch, the tensile properties of metal material, and the cyclic loading conditions. The experimental results show that the obtained theoretical analyses about the crack initiation location, the crack initiation direction, and the crack initiation time in this paper are correct. It is also shown that the crack initiation time accounts for about 80% of the cropping time for every segment of the metal bar.

Relation between Test Temperatures and Notch Tip Radii in Tensile Fracture Manner of Center Notched CFRP

1991 ◽  
Vol 51-52 ◽  
pp. 119-124
Author(s):  
Yong Hwan Kim ◽  
Hironobu Nisitani ◽  
Riichi Murakami ◽  
T. Nonomura ◽  
Sohei Okada
Keyword(s):  
Tensile Fracture ◽  
Notch Tip

Failure initiation at a blunt V-notch tip under mixed mode loading

2008 ◽  
Vol 149 (2) ◽  
pp. 143-173 ◽  
Author(s):  
Elad Priel ◽  
Zohar Yosibash ◽  
Dominique Leguillon
Keyword(s):  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Failure Initiation ◽  
Notch Tip
Sign in / Sign up

Export Citation Format

Share Document