The present contribution reviews some recent results on the experimental characterisation of the nanoscale fracture toughness of silicon by using pre-cracked specimens and alternatively the theory of critical distances (TCD). Later, the results are discussed to provide the ultimate dimensional limit of the continuum fracture mechanics at the nanoscale in the light of sophisticated discrete atomic simulations at the onset of brittle fracture. The results show that the fracture toughness of Si is independent of the scale, crystal orientation and the singular stress field length. This confirms the atomistic nature of the brittle fracture. Moreover, the continuum fracture mechanics fails below a singular stress field approaching 2 nm.
|Title of host publication||Proceedings of the First International Conference on Theoretical, Applied and Experimental Mechanics|
|Number of pages||6|
|Publication status||Published - 2019|
|MoE publication type||A4 Article in a conference publication|
|Name||Structural Integrity book series|
- Quantum Mechanics
Gallo, P., Sumigawa, T., Shimada, T., Yan, Y., & Kitamura, T. (2019). Investigation into the breakdown of continuum fracture mechanics: synthesis of recent results on silicon. In Proceedings of the First International Conference on Theoretical, Applied and Experimental Mechanics (Vol. 5, pp. 205-210). (Structural Integrity book series; Vol. 5). https://doi.org/10.1007/978-3-319-91989-8_45