{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"5faba788681101ac93dbaf0b5eb98c536616b1027623a7056b779519db067f0b","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"39fbfaa8c0984c24bada25e63a5bd6f4175eed2219525bea3a9510632bf19502","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"bio.amorphous-plasticity.shear-band-nucleation","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"Metallic glasses fail by concentrating all deformation into a thin band that then slides like a crack. How scattered local rearrangements organize into such a band, and at what strain, is unknown.","posed_since":"","precise":"Determine the mechanism, length scale and critical strain for nucleation of a system-spanning shear band in metallic and model glasses under uniaxial or shear loading: the organization of shear-transformation zones (localized rearrangements of about 10 to 100 atoms) into a band, the role of local softening (free volume or effective temperature), and the resulting dependence of ductility on sample size and annealing.","problem_ref":null,"references":"","settled_by":"A theory predicting the band nucleation strain and its sample-size and annealing dependence, confirmed by atomistic simulations and micro-pillar compression experiments.","status_note":"","title":"How shear bands nucleate in metallic glasses","topic_ref":"e78bfe90db080ebe4f05460ebebe6c1ecd9eb9abbe035dcdb9122cce699033c5"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"93e601eefb3757880ac1eb9c2c0437aa0c6c229342122f5a750962ea54a302bf","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"26cae739be6245bd86ed19c7ffe162ee95a0c9fb33c47f83143c13f4c87b8b48","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"aD24qCeKCMDEDaktwEIiHA6v13Y3lqI43dkn2a1E00WRWnj7rl5abJjxIvlkh70NStwHnvOkVHdNHRpRu_GaBw"},"schema":"pubphys.envelope/1"},"record_hash":"93e601eefb3757880ac1eb9c2c0437aa0c6c229342122f5a750962ea54a302bf","leaf_index":728}