{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:P4KLZPMQ4HUBKZJDMYOB5QKY5D","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a5df986226a6caf3831fccf927e051c0b49792094c6642a869df510cbf61c393","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2012-08-02T18:09:55Z","title_canon_sha256":"9891860707a433e895b5277947b7101f7b8c7bb7dc0bc925c068734df3acea64"},"schema_version":"1.0","source":{"id":"1208.0565","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.0565","created_at":"2026-05-18T03:49:33Z"},{"alias_kind":"arxiv_version","alias_value":"1208.0565v1","created_at":"2026-05-18T03:49:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.0565","created_at":"2026-05-18T03:49:33Z"},{"alias_kind":"pith_short_12","alias_value":"P4KLZPMQ4HUB","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"P4KLZPMQ4HUBKZJD","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"P4KLZPMQ","created_at":"2026-05-18T12:27:18Z"}],"graph_snapshots":[{"event_id":"sha256:7d764795d628da21bc89048c3ac5f774d1133fffdb7b59a1bce212dbd7e4ae73","target":"graph","created_at":"2026-05-18T03:49:33Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We performed a series of numerical vertical compression tests on assemblies of 2D granular material using a Discrete Element code and studied the results with regard to the grain shape. The samples consist of 5,000 grains made from either 3 overlapping discs (clumps - grains with concavities) or six-edged polygons (convex grains). These two grain type have similar external envelopes, which is a function of a geometrical parameter $\\alpha$.\n  In this paper, the numerical procedure applied is briefly presented followed by the description of the granular model used. Observations and mechanical an","authors_text":"G. Combe, K. Szarf, P. Villard","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2012-08-02T18:09:55Z","title":"Polygons vs. clumps of discs: a numerical study of the influence of grain shape on the mechanical behaviour of granular materials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.0565","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:30547736b39ef9f24690029526464ba84f64388faffafe7aab6c76148b06614d","target":"record","created_at":"2026-05-18T03:49:33Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a5df986226a6caf3831fccf927e051c0b49792094c6642a869df510cbf61c393","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2012-08-02T18:09:55Z","title_canon_sha256":"9891860707a433e895b5277947b7101f7b8c7bb7dc0bc925c068734df3acea64"},"schema_version":"1.0","source":{"id":"1208.0565","kind":"arxiv","version":1}},"canonical_sha256":"7f14bcbd90e1e8156523661c1ec158e8edf1621531c74b502b4f8761c22a5251","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7f14bcbd90e1e8156523661c1ec158e8edf1621531c74b502b4f8761c22a5251","first_computed_at":"2026-05-18T03:49:33.763657Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:49:33.763657Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"s1WJjAzR2Wqt4j+Ffx6u3PLxFRNSZ0vQQpcLcj4ZD7DW23mwG6kV+5yKGpN5rSOjNNCFHN2jaFr7xSRSExBbCg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:49:33.764494Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.0565","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:30547736b39ef9f24690029526464ba84f64388faffafe7aab6c76148b06614d","sha256:7d764795d628da21bc89048c3ac5f774d1133fffdb7b59a1bce212dbd7e4ae73"],"state_sha256":"c7b6c250124e9b59741c6a030fff819a72295d5581b8a1b419bff3d6f9cc8049"}