{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:2KWAL7FV4Q5KOLVDCZHSQELQRV","short_pith_number":"pith:2KWAL7FV","canonical_record":{"source":{"id":"1512.01359","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-12-04T10:14:54Z","cross_cats_sorted":[],"title_canon_sha256":"2cd94dad8a5b35d7fb0963964f3ed0e067db57109dd7fd0ea92185fd3008414f","abstract_canon_sha256":"bbe7da5faf7351b0e399e1f357cc8800de76dc5acf26018c8dcc9dc59a89207f"},"schema_version":"1.0"},"canonical_sha256":"d2ac05fcb5e43aa72ea3164f2811708d403bec26c2df870902a449d9a07bc500","source":{"kind":"arxiv","id":"1512.01359","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.01359","created_at":"2026-05-18T01:25:17Z"},{"alias_kind":"arxiv_version","alias_value":"1512.01359v1","created_at":"2026-05-18T01:25:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.01359","created_at":"2026-05-18T01:25:17Z"},{"alias_kind":"pith_short_12","alias_value":"2KWAL7FV4Q5K","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"2KWAL7FV4Q5KOLVD","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"2KWAL7FV","created_at":"2026-05-18T12:29:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:2KWAL7FV4Q5KOLVDCZHSQELQRV","target":"record","payload":{"canonical_record":{"source":{"id":"1512.01359","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-12-04T10:14:54Z","cross_cats_sorted":[],"title_canon_sha256":"2cd94dad8a5b35d7fb0963964f3ed0e067db57109dd7fd0ea92185fd3008414f","abstract_canon_sha256":"bbe7da5faf7351b0e399e1f357cc8800de76dc5acf26018c8dcc9dc59a89207f"},"schema_version":"1.0"},"canonical_sha256":"d2ac05fcb5e43aa72ea3164f2811708d403bec26c2df870902a449d9a07bc500","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:17.184846Z","signature_b64":"b+3zCc63Vrg8QlDcv8cHXPMq1tELI1T7CjQzBSvS6kvr7qZ+buBPSDFrHl5GVGGSfeA1RbUfE5+UOi+v+/y8AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2ac05fcb5e43aa72ea3164f2811708d403bec26c2df870902a449d9a07bc500","last_reissued_at":"2026-05-18T01:25:17.184157Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:17.184157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.01359","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:25:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RpzXKIpZNztOkdvLYg0MG8y/TeEnKMeA7peSyOzkMLESNOdP5nV187lRbl71qhAVNjmaM5j/pVFXjyIznUsuDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:14:00.767862Z"},"content_sha256":"9607bb776f38a8db9639066a0bfbb45994925600a1ba49d7f956632373a6a62c","schema_version":"1.0","event_id":"sha256:9607bb776f38a8db9639066a0bfbb45994925600a1ba49d7f956632373a6a62c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:2KWAL7FV4Q5KOLVDCZHSQELQRV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the dependency of rubber friction on the normal force or load: theory and experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.soft","authors_text":"A. Furno, B. Lorenz, B.N.J. Persson, G. Fortunato, M. Scaraggi, V. Ciaravola","submitted_at":"2015-12-04T10:14:54Z","abstract_excerpt":"In rubber friction studies it is often observed that the kinetic friction coefficient {\\mu} depends on the nominal contact pressure p. We discuss several possible origins of the pressure dependency of {\\mu}: (a) saturation of the contact area (and friction force) due to high nominal squeezing pressure, (b) non-linear viscoelasticity, (c) non-randomness in the surface topography, in particular the influence of the skewness of the surface roughness profile, (d) adhesion, and (e) frictional heating. We show that in most cases the non-linearity in the {\\mu}(p) relation is mainly due to process (e)"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.01359","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:25:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"da5OLO+97i6dk/Wdw/WKdPtgyGGpK1qyHyvYkgVmC0feBUdIneLTVUtMHUmJBOok/oNmF9BNESvOauQM2OhcBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:14:00.768476Z"},"content_sha256":"e478f94a0078cea0a35961f27858d07af108a24efce89ad08cf8aac8ee281175","schema_version":"1.0","event_id":"sha256:e478f94a0078cea0a35961f27858d07af108a24efce89ad08cf8aac8ee281175"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2KWAL7FV4Q5KOLVDCZHSQELQRV/bundle.json","state_url":"https://pith.science/pith/2KWAL7FV4Q5KOLVDCZHSQELQRV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2KWAL7FV4Q5KOLVDCZHSQELQRV/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T21:14:00Z","links":{"resolver":"https://pith.science/pith/2KWAL7FV4Q5KOLVDCZHSQELQRV","bundle":"https://pith.science/pith/2KWAL7FV4Q5KOLVDCZHSQELQRV/bundle.json","state":"https://pith.science/pith/2KWAL7FV4Q5KOLVDCZHSQELQRV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2KWAL7FV4Q5KOLVDCZHSQELQRV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:2KWAL7FV4Q5KOLVDCZHSQELQRV","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":"bbe7da5faf7351b0e399e1f357cc8800de76dc5acf26018c8dcc9dc59a89207f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-12-04T10:14:54Z","title_canon_sha256":"2cd94dad8a5b35d7fb0963964f3ed0e067db57109dd7fd0ea92185fd3008414f"},"schema_version":"1.0","source":{"id":"1512.01359","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.01359","created_at":"2026-05-18T01:25:17Z"},{"alias_kind":"arxiv_version","alias_value":"1512.01359v1","created_at":"2026-05-18T01:25:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.01359","created_at":"2026-05-18T01:25:17Z"},{"alias_kind":"pith_short_12","alias_value":"2KWAL7FV4Q5K","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"2KWAL7FV4Q5KOLVD","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"2KWAL7FV","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:e478f94a0078cea0a35961f27858d07af108a24efce89ad08cf8aac8ee281175","target":"graph","created_at":"2026-05-18T01:25:17Z","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":"In rubber friction studies it is often observed that the kinetic friction coefficient {\\mu} depends on the nominal contact pressure p. We discuss several possible origins of the pressure dependency of {\\mu}: (a) saturation of the contact area (and friction force) due to high nominal squeezing pressure, (b) non-linear viscoelasticity, (c) non-randomness in the surface topography, in particular the influence of the skewness of the surface roughness profile, (d) adhesion, and (e) frictional heating. We show that in most cases the non-linearity in the {\\mu}(p) relation is mainly due to process (e)","authors_text":"A. Furno, B. Lorenz, B.N.J. Persson, G. Fortunato, M. Scaraggi, V. Ciaravola","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-12-04T10:14:54Z","title":"On the dependency of rubber friction on the normal force or load: theory and experiment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.01359","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":"sha256:9607bb776f38a8db9639066a0bfbb45994925600a1ba49d7f956632373a6a62c","target":"record","created_at":"2026-05-18T01:25:17Z","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":"bbe7da5faf7351b0e399e1f357cc8800de76dc5acf26018c8dcc9dc59a89207f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2015-12-04T10:14:54Z","title_canon_sha256":"2cd94dad8a5b35d7fb0963964f3ed0e067db57109dd7fd0ea92185fd3008414f"},"schema_version":"1.0","source":{"id":"1512.01359","kind":"arxiv","version":1}},"canonical_sha256":"d2ac05fcb5e43aa72ea3164f2811708d403bec26c2df870902a449d9a07bc500","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d2ac05fcb5e43aa72ea3164f2811708d403bec26c2df870902a449d9a07bc500","first_computed_at":"2026-05-18T01:25:17.184157Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:17.184157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"b+3zCc63Vrg8QlDcv8cHXPMq1tELI1T7CjQzBSvS6kvr7qZ+buBPSDFrHl5GVGGSfeA1RbUfE5+UOi+v+/y8AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:17.184846Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.01359","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9607bb776f38a8db9639066a0bfbb45994925600a1ba49d7f956632373a6a62c","sha256:e478f94a0078cea0a35961f27858d07af108a24efce89ad08cf8aac8ee281175"],"state_sha256":"e8e6190035b209b64a1f8d64272ea7a1674aa2689b10667d799815e70e8db6ee"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Be/tIkqbSVOY0XziWxncybXd1amsI4MkXbI1QVKHwndle6GGzpGGT1vcxBXASbcm6D6uE6dS2pBWvc8kAhMmCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T21:14:00.771134Z","bundle_sha256":"0d89fe81cf42f9ee2f01fc9342e3349918ff51b28fa7dba2694f9988032e3eef"}}