Dislocation Emission and Crack Dislocation Interactions
An understanding of the crack initiation and crack growth in metals spanning the entire spectrum of conventional and advanced has long been a major scientific challenge. It is known that dislocations are involved both in the initiation and propagation of cracks in metals and alloys. In this review,...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-04-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/10/4/473 |
| _version_ | 1797571439491022848 |
|---|---|
| author | Chandra S. Pande Ramasis Goswami |
| author_facet | Chandra S. Pande Ramasis Goswami |
| author_sort | Chandra S. Pande |
| collection | DOAJ |
| description | An understanding of the crack initiation and crack growth in metals spanning the entire spectrum of conventional and advanced has long been a major scientific challenge. It is known that dislocations are involved both in the initiation and propagation of cracks in metals and alloys. In this review, we first describe the experimental observations of dislocation emission from cracks under stress. Then the role played by these dislocations in fatigue and fracture is considered at a fundamental level by considering the interactions of crack and dislocations emitted from the crack. We obtain precise expression for the equilibrium positions of dislocations in an array ahead of crack tip. We estimate important parameters, such as plastic zone size, dislocation free zone and dislocation stress intensity factor for the analysis of crack propagation. Finally, we describe very recent novel and significant results, such as residual stresses and relatively large lattice rotations across a number of grains in front of the crack that accompanies fatigue process. |
| first_indexed | 2024-03-10T20:40:41Z |
| format | Article |
| id | doaj.art-15dfd17106da48669bcaab5022926f85 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T20:40:41Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-15dfd17106da48669bcaab5022926f852023-11-19T20:40:19ZengMDPI AGMetals2075-47012020-04-0110447310.3390/met10040473Dislocation Emission and Crack Dislocation InteractionsChandra S. Pande0Ramasis Goswami1Volunteer Emeritus, Naval Research Laboratory, Washington, DC 20375, USAMaterials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375, USAAn understanding of the crack initiation and crack growth in metals spanning the entire spectrum of conventional and advanced has long been a major scientific challenge. It is known that dislocations are involved both in the initiation and propagation of cracks in metals and alloys. In this review, we first describe the experimental observations of dislocation emission from cracks under stress. Then the role played by these dislocations in fatigue and fracture is considered at a fundamental level by considering the interactions of crack and dislocations emitted from the crack. We obtain precise expression for the equilibrium positions of dislocations in an array ahead of crack tip. We estimate important parameters, such as plastic zone size, dislocation free zone and dislocation stress intensity factor for the analysis of crack propagation. Finally, we describe very recent novel and significant results, such as residual stresses and relatively large lattice rotations across a number of grains in front of the crack that accompanies fatigue process.https://www.mdpi.com/2075-4701/10/4/473crack tip dislocationsTEMgrain rotationfatiguedislocation configurationsresidual stress |
| spellingShingle | Chandra S. Pande Ramasis Goswami Dislocation Emission and Crack Dislocation Interactions Metals crack tip dislocations TEM grain rotation fatigue dislocation configurations residual stress |
| title | Dislocation Emission and Crack Dislocation Interactions |
| title_full | Dislocation Emission and Crack Dislocation Interactions |
| title_fullStr | Dislocation Emission and Crack Dislocation Interactions |
| title_full_unstemmed | Dislocation Emission and Crack Dislocation Interactions |
| title_short | Dislocation Emission and Crack Dislocation Interactions |
| title_sort | dislocation emission and crack dislocation interactions |
| topic | crack tip dislocations TEM grain rotation fatigue dislocation configurations residual stress |
| url | https://www.mdpi.com/2075-4701/10/4/473 |
| work_keys_str_mv | AT chandraspande dislocationemissionandcrackdislocationinteractions AT ramasisgoswami dislocationemissionandcrackdislocationinteractions |