Experimental characterization at nanoscale of single crystal silicon fracture toughness
The work reviews some preliminary recent micromechanical tests aimed at the evaluation of the fracture toughness of silicon. Pre-cracked nano specimens and alternatively notched nano specimens combined with the theory of critical distances (TCD) are compared. The results show that the fracture tough...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2019-01-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero47/numero_47_art_31.pdf |
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| author | Pasquale Gallo Takashi Sumigawa Takayuki Kitamura |
| author_facet | Pasquale Gallo Takashi Sumigawa Takayuki Kitamura |
| author_sort | Pasquale Gallo |
| collection | DOAJ |
| description | The work reviews some preliminary recent micromechanical tests aimed at the evaluation of the fracture toughness of silicon. Pre-cracked nano specimens and alternatively notched nano specimens combined with the theory of critical distances (TCD) are compared. The results show that the fracture toughness of silicon is approximately 1 MPam0.5, regardless of the procedure involved (i.e., pre-cracked samples or TCD). This value agrees with macro counterpart, i.e., 0.75-1.08 MPam0.5, and therefore the KIC is independent of the size and crystal orientation. However, by employing the TCD, the accurate control of the final crack tip which is currently very challenging, is overcome by using notched specimens. Additionally, the results give information about the crack propagation at the nanoscale. It seems that although the specimen axis deviates from the (011), the crack propagates along the cleavage plane (011) and the process develops very fast by breaking covalent bond at the crack tip. A brief discussion on beyond the breakdown of continuum theory and challenges toward nanometer scale fracture mechanics concludes the paper |
| format | Article |
| id | doaj-art-8c65a4fa14bb490d84859e8932781c65 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-8c65a4fa14bb490d84859e8932781c652025-01-02T23:00:55ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932019-01-01134740841510.3221/IGF-ESIS.47.3110.3221/IGF-ESIS.47.31Experimental characterization at nanoscale of single crystal silicon fracture toughnessPasquale GalloTakashi SumigawaTakayuki KitamuraThe work reviews some preliminary recent micromechanical tests aimed at the evaluation of the fracture toughness of silicon. Pre-cracked nano specimens and alternatively notched nano specimens combined with the theory of critical distances (TCD) are compared. The results show that the fracture toughness of silicon is approximately 1 MPam0.5, regardless of the procedure involved (i.e., pre-cracked samples or TCD). This value agrees with macro counterpart, i.e., 0.75-1.08 MPam0.5, and therefore the KIC is independent of the size and crystal orientation. However, by employing the TCD, the accurate control of the final crack tip which is currently very challenging, is overcome by using notched specimens. Additionally, the results give information about the crack propagation at the nanoscale. It seems that although the specimen axis deviates from the (011), the crack propagates along the cleavage plane (011) and the process develops very fast by breaking covalent bond at the crack tip. A brief discussion on beyond the breakdown of continuum theory and challenges toward nanometer scale fracture mechanics concludes the paperhttp://www.gruppofrattura.it/pdf/rivista/numero47/numero_47_art_31.pdfFracture nanomechanics Silicon Nanoscale Fracture toughness |
| spellingShingle | Pasquale Gallo Takashi Sumigawa Takayuki Kitamura Experimental characterization at nanoscale of single crystal silicon fracture toughness Fracture and Structural Integrity Fracture nanomechanics Silicon Nanoscale Fracture toughness |
| title | Experimental characterization at nanoscale of single crystal silicon fracture toughness |
| title_full | Experimental characterization at nanoscale of single crystal silicon fracture toughness |
| title_fullStr | Experimental characterization at nanoscale of single crystal silicon fracture toughness |
| title_full_unstemmed | Experimental characterization at nanoscale of single crystal silicon fracture toughness |
| title_short | Experimental characterization at nanoscale of single crystal silicon fracture toughness |
| title_sort | experimental characterization at nanoscale of single crystal silicon fracture toughness |
| topic | Fracture nanomechanics Silicon Nanoscale Fracture toughness |
| url | http://www.gruppofrattura.it/pdf/rivista/numero47/numero_47_art_31.pdf |
| work_keys_str_mv | AT pasqualegallo experimentalcharacterizationatnanoscaleofsinglecrystalsiliconfracturetoughness AT takashisumigawa experimentalcharacterizationatnanoscaleofsinglecrystalsiliconfracturetoughness AT takayukikitamura experimentalcharacterizationatnanoscaleofsinglecrystalsiliconfracturetoughness |