{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"19784f9e528b9fe56df171b6eb0b1684ae7f23adfbb3e493f29665546043f945","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"94bfcff311d147bdf3f92544e55526ba59b282259c523f4d2e0ad70d5a02356c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"bio.amorphous-plasticity.brittle-ductile-yielding","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Glasses cooled quickly yield gradually when sheared, while slowly cooled glasses fail suddenly along a crack-like band. Whether a sharp critical point separates these two behaviours in large samples is disputed.","posed_since":"2018","precise":"Under athermal quasistatic shear, poorly annealed glasses yield smoothly (ductile) and well-annealed glasses yield through a macroscopic stress drop (brittle). A 2018 scenario maps this onto a random-field-Ising-like critical point at a preparation temperature T_p,c. Determine whether this critical point exists in the thermodynamic limit in $d = 2\\ \\text{and}\\ 3$, and its universality class, or whether brittle failure occurs for every preparation once the system is large enough.","problem_ref":null,"references":"","settled_by":"Finite-size scaling of the stress-drop distribution and susceptibilities across preparation temperature for systems large enough to settle the limit, consistent with an elastoplastic or field theory.","status_note":"Finite-size studies since 2020 disagree on whether the ductile regime survives in the thermodynamic limit (2026).","title":"Is the brittle-to-ductile change in glass yielding a critical point","topic_ref":"e78bfe90db080ebe4f05460ebebe6c1ecd9eb9abbe035dcdb9122cce699033c5"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e2da5994caa64670ae036d6e15030b428466154aed0a947fe9457e18c2399b3e","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"d369331602bfc21d6ab54a59706f7ef88e7389f6805e16e2a160c1e32996e05f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"ipMIKKsq2_NKJ6SYh67rMbI0bmojwIYlV5bQD9BiODjMAeIfLHJO9gJDnJ3BfGn6n4s3gla9qwTk3IfhNoXIDg"},"schema":"pubphys.envelope/1"},"record_hash":"e2da5994caa64670ae036d6e15030b428466154aed0a947fe9457e18c2399b3e","leaf_index":726}