scholarly journals Inherent possibilities and limitations of finite element modelling of defective girth welds

2010 ◽  
Vol 1 (1) ◽  
pp. 127-135
Author(s):  
Stijn Hertele ◽  
Wim De Waele ◽  
Rudi Denys ◽  
Matthias Verstraete
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Experimental Research ◽  
Finite Element Modelling ◽  
Experimental Validation ◽  
Stable Crack Growth ◽  
Worst Case ◽  
Element Modelling ◽  
Numerical Research ◽  
Girth Welds

Welds unavoidably show defects, which can negatively affect the integrity of the entire structureand, worst case, result in a failure. Defects of a considerable size should therefore be detected, assessedand, if necessary, repaired. The assessment of a defect requires a procedure which allows a conservativeestimation of the acceptability of the defect. To develop such procedure, both experimental and numericalresearch is performed. This paper describes the inherent possibilities and limitations of numerical researchthrough finite element modelling, as compared to experimental research. Summarizing all arguments, itbecomes clear that numerical research is a highly powerful tool, but a thorough experimental validation is ofparamount importance. Moreover, some specific weld-related problems are highly difficult to address,namely the presence of stable crack growth and material heterogeneity. More research is needed toachieve a description of these phenomena, under a set of conservative assumptions.

scholarly journals Experimental validation of finite element modelling on tibia with osteogenesis imperfecta

2019 ◽  
Vol 670 ◽  
pp. 012015
Author(s):  
H Y Tan ◽  
K S Basaruddin ◽  
S F Khan ◽  
M H Mat Som ◽  
R Daud ◽  
...  
Keyword(s):  
Finite Element ◽  
Osteogenesis Imperfecta ◽  
Finite Element Modelling ◽  
Experimental Validation ◽  
Element Modelling

Finite element modelling and experimental validation of bolt loosening due to thread wear under transverse cyclic loading

2019 ◽  
Vol 104 ◽  
pp. 341-353 ◽  
Author(s):  
Mingyuan Zhang ◽  
Dongfang Zeng ◽  
Liantao Lu ◽  
Yuanbin Zhang ◽  
Jing Wang ◽  
...  
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Finite Element Modelling ◽  
Experimental Validation ◽  
Element Modelling ◽  
Bolt Loosening

scholarly journals Dimpling process in cold roll metal forming by finite element modelling and experimental validation

2014 ◽  
Vol 16 (3) ◽  
pp. 363-372 ◽  
Author(s):  
V.B. Nguyen ◽  
C.J. Wang ◽  
D.J. Mynors ◽  
M.A. English ◽  
M.A. Castellucci
Keyword(s):  
Finite Element ◽  
Metal Forming ◽  
Finite Element Modelling ◽  
Experimental Validation ◽  
Element Modelling ◽  
Cold Roll

The Effects of Crack Growth History on Fracture Toughness

2019 ◽  
Author(s):  
M. A. Probert ◽  
H. E. Coules ◽  
C. E. Truman ◽  
M. Hofmann
Keyword(s):  
Fracture Toughness ◽  
Finite Element ◽  
Crack Growth ◽  
Parametric Study ◽  
Finite Element Modelling ◽  
Crack Tip ◽  
High Yield ◽  
Element Modelling ◽  
History Effects ◽  
Apparent Fracture Toughness

Abstract The introduction of cracks into loaded versus unloaded components has a significant effect on the apparent fracture toughness within finite element modelling. The history effects of crack introduction can be beneficial to defect assessment procedures that do not consider prior plasticity specifically from crack introduction. It is assumed that as strain energy is released due to plastic deformation during crack formation a reduction in the energy available for crack propagation under fracture conditions is experienced. This can be characterized by the formation of a plastic wake behind the crack tip and leads to significant increases in load at critical J and other crack growth parameters for modelling situations. However experimental evidence validating this apparent fracture toughness increase are needed. A beneficial increase in apparent fracture toughness can prolong the life of components that might be taken out of service prematurely if history effects are not considered. This paper discusses a series of experimental and modelling approaches that have been taken to assess the magnitude of the benefit in increase of apparent fracture toughness by the manipulation of crack introduction history effects. An initial parametric study of material properties on the effect of introducing cracks into loaded and unloaded components indicates that most benefit be derived from high hardness, high yield materials such as Aluminum 7000 series alloys. Further work has been carried out with experimental C(T) specimens of Aluminum Alloy 7475 T7351. Cracks were introduced by fatigue into the samples. One set of specimens was fatigued with a low mean load and the other with a high mean load, this was achieved by keeping a consistent ΔKI between specimens and changing the load ratio one set of specimens. Fracture test results indicate that the influence of prior plasticity on fracture initiation is much subtler in experimental trials than in the finite element model. Crack growth resistance curves and neutron diffraction results measuring the residual stress created ahead of the crack tip by this method are be discussed and contrasted with the parametric study and finite element modelling of the two different crack introduction scenarios.

Comparison of geometry-based and CT voxel-based finite element modelling and experimental validation

1998 ◽  
Vol 20 (7) ◽  
pp. 515-522 ◽  
Author(s):  
M Lengsfeld ◽  
J Schmitt ◽  
P Alter ◽  
J Kaminsky ◽  
R Leppek
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Experimental Validation ◽  
Element Modelling
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