the constraints of prestrain history and overmatch degree are positive for the same crack tip opening displacement level. The crack tip stress field was more significantly influenced by the strength mismatch than the prestrain history in examined cases. KEYWORDS combined effect, crack tip constraint, ductile fracture, mismatched welded joints, prestrain
Constraint Effect - an overview ScienceDirect TopicsIn addition to being most severely loaded, these flaws are highly influenced by constraint conditions and the fact that yield and fracture behavior of RPV steels are history dependent. Thus, the specific steel, its condition, nature of existing flaws, and the time/temperature of maximum loading all impact the margin from RPV fracture.
May 29, 2017 · Effect of Sigma Phase on Fracture Behavior of Steels and Weld Joints of Components in Power Industry Working at Supercritical Conditions. By Zdenk Kubo, árka Stejskalová and Ladislav Kander. Submitted:May 29th 2017 Reviewed:October 10th 2017 Published:December 20th 2017. DOI:10.5772/intechopen.71569
Effect of fracture path on the toughness of weld metal Oct 19, 2004 · The crack propagation direction may affect weld metal fracture behavior. This fracture behavior has been investigated using two sets of single edge notched bend (SENB) specimens; one with a crack propagating in the welding direction (B×2B) and the other with a crack propagating from the top in the root direction (B×B) of a welded joint. Two different weld metals were used, one with low and
Effects of Temperature and Crack Tip Constraint on J-Q-M theory (see Zhang et al, 1996) where both constraint effects due to geometry and material mismatch were included in the characterization of the local stress field ahead of the crack-tip. In this study, the effects of temperature and crack tip constraint on cleavage fracture toughness in weld thermal simulated X80 pipeline steel is studied.
However, the fracture behavior of these structural steels and weldments can be affected significantly by temperature, loading rate, stress level, and flaw size, as well as by plate thickness or constraint, joint geometry, and workmanship.
Geometry and material constraint effects on fracture Apr 13, 2016 · Under the condition of middle geometry constraint, the material constraint effect on fracture resistance is the most significant. With further increasing geometry constraint, the fracture resistance behavior of the interfaces is gradually dominated by the higher geometry constraint, and the material constraint effect becomes weaken.
Micromechanical Analysis of Constraint Effect on Fracture In this paper the micromechanical approach to ductile fracture was applied in a study of constraint effect on crack growth initiation in mismatched welded joints. The single-edged notched bend specimens (precrack length a0/W=0.32) were experimentally and numerically analyzed. The coupled micromechanical model proposed by Gurson, Tvergaard and Needleman was used.
The effect of yield strength mismatch on the fracture behavior of welded nodular cast iron Hakan Cetinel IntroductionThe results of various studies show that; strength mismatch due to different strength levels of weld metal (WM), base metal (BM), and heat-affected zone (HAZ) can significantly affect the structural performance, deformation and fracture behavior of welded joints [1,2].Effect of constraint on fracture behavior of welded Effect of constraint on fracture behavior of welded 17mn4 and aisi304 steels ter results for fracture behavior of welded ductile iron . In