Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through Cracks
Part-through surface or corner 2D cracks are commonly found in structural components, even because practically all fatigue cracks tend to start this way. It is a reasonable hypothesis to model them assuming the shape of their 2D fronts can be approximated by an elliptical arc, as supported by many f...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2019-04-01
|
| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2302/2475 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832568711163150336 |
|---|---|
| author | Antonio Carlos de Oliveira Miranda Rafael Marques Marco Antonio Meggiolaro Jaime Tupiass� Pinho de Castro |
| author_facet | Antonio Carlos de Oliveira Miranda Rafael Marques Marco Antonio Meggiolaro Jaime Tupiass� Pinho de Castro |
| author_sort | Antonio Carlos de Oliveira Miranda |
| collection | DOAJ |
| description | Part-through surface or corner 2D cracks are commonly found in structural components, even because practically all fatigue cracks tend to start this way. It is a reasonable hypothesis to model them assuming the shape of their 2D fronts can be approximated by an elliptical arc, as supported by many fractographic observations. However, their transition to a 1D through-crack, an important issue in many practical applications, is normally not properly addressed in fatigue life predictions. Although experimental results reveal that the frontiers of surface cracks essentially retain their elliptical shape as they gradually grow into an 1D through-crack, it is usual to assume they are immediately transformed into an 1D through-crack when their depth reaches the cracked component thickness. This crude approximation may create a large jump in stress intensity values, leading to excessively conservative fatigue crack growth predictions; or else, the crude shape jump hypothesis might induce false overload events that can much affect fatigue crack growth retardation models, leading to inadmissible non-conservative life predictions. To minimize such problems, an improved model to describe the transition of 2D surface cracks to 1D through-cracks is proposed and verified by crack propagation tests in two different materials, 4340 steel and polycarbonate (PC). Moreover, fatigue life predictions based on this improved model are compared with experimental results obtained with these two materials. |
| format | Article |
| id | doaj-art-6d21b326988e4c2b9ec2fa7b09bec89e |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2019-04-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-6d21b326988e4c2b9ec2fa7b09bec89e2025-02-03T00:42:37ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932019-04-01134861162910.3221/IGF-ESIS.48.5910.3221/IGF-ESIS.48.59Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through CracksAntonio Carlos de Oliveira MirandaRafael MarquesMarco Antonio MeggiolaroJaime Tupiass� Pinho de CastroPart-through surface or corner 2D cracks are commonly found in structural components, even because practically all fatigue cracks tend to start this way. It is a reasonable hypothesis to model them assuming the shape of their 2D fronts can be approximated by an elliptical arc, as supported by many fractographic observations. However, their transition to a 1D through-crack, an important issue in many practical applications, is normally not properly addressed in fatigue life predictions. Although experimental results reveal that the frontiers of surface cracks essentially retain their elliptical shape as they gradually grow into an 1D through-crack, it is usual to assume they are immediately transformed into an 1D through-crack when their depth reaches the cracked component thickness. This crude approximation may create a large jump in stress intensity values, leading to excessively conservative fatigue crack growth predictions; or else, the crude shape jump hypothesis might induce false overload events that can much affect fatigue crack growth retardation models, leading to inadmissible non-conservative life predictions. To minimize such problems, an improved model to describe the transition of 2D surface cracks to 1D through-cracks is proposed and verified by crack propagation tests in two different materials, 4340 steel and polycarbonate (PC). Moreover, fatigue life predictions based on this improved model are compared with experimental results obtained with these two materials.https://www.fracturae.com/index.php/fis/article/view/2302/24752D-1D crack transitionSIF equationsfatigue analysis |
| spellingShingle | Antonio Carlos de Oliveira Miranda Rafael Marques Marco Antonio Meggiolaro Jaime Tupiass� Pinho de Castro Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through Cracks Fracture and Structural Integrity 2D-1D crack transition SIF equations fatigue analysis |
| title | Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through Cracks |
| title_full | Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through Cracks |
| title_fullStr | Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through Cracks |
| title_full_unstemmed | Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through Cracks |
| title_short | Stress Intensity Factor Equations for the Evolution of Surface and Corner Cracks to Through Cracks |
| title_sort | stress intensity factor equations for the evolution of surface and corner cracks to through cracks |
| topic | 2D-1D crack transition SIF equations fatigue analysis |
| url | https://www.fracturae.com/index.php/fis/article/view/2302/2475 |
| work_keys_str_mv | AT antoniocarlosdeoliveiramiranda stressintensityfactorequationsfortheevolutionofsurfaceandcornercrackstothroughcracks AT rafaelmarques stressintensityfactorequationsfortheevolutionofsurfaceandcornercrackstothroughcracks AT marcoantoniomeggiolaro stressintensityfactorequationsfortheevolutionofsurfaceandcornercrackstothroughcracks AT jaimetupiasspinhodecastro stressintensityfactorequationsfortheevolutionofsurfaceandcornercrackstothroughcracks |