Item talk:Q231196
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{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Theory of friction based on brittle fracture", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70011549", "url": "https://pubs.usgs.gov/publication/70011549" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70011549 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1063/1.1710026", "url": "https://doi.org/10.1063/1.1710026" }, { "@type": "PropertyValue", "propertyID": "ISSN", "value": "00214922" } ], "journal": { "@type": "Periodical", "name": "Journal of Applied Physics", "volumeNumber": "38", "issueNumber": "7" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Journal of Applied Physics" } ], "datePublished": "1967", "dateModified": "2020-11-24", "abstract": "A theory of\u00a0friction\u00a0is presented that may be more applicable to\u00a0geologic\u00a0materials\u00a0than the classic Bowden and Tabor theory. In the model, surfaces touch at the peaks of asperities and sliding occurs when the asperities fail by\u00a0brittle\u00a0fracture.\u00a0The coefficient of\u00a0friction,\u00a0\u03bc, was calculated from the strength of asperities of certain ideal shapes; for cone\u2010shaped asperities, \u03bc is about 0.1 and for wedge\u2010shaped asperities, \u03bc is about 0.15. For actual situations which seem close to the ideal model, observed \u03bc was found to be very close to 0.1, even for\u00a0materials\u00a0such as\u00a0quartz\u00a0and calcite with widely differing strengths. If surface forces are present, the theory predicts that \u03bc should decrease with load and that it should be higher in a vacuum than in air. In the presence of a fluid film between sliding surfaces, \u03bc should depend on the area of the surfaces in contact. Both effects are observed. The character of wear particles produced during sliding and the way in which \u03bc depends on normal load, roughness, and environment lend further support to the model of\u00a0friction\u00a0presented here.", "description": "7 p.", "publisher": { "@type": "Organization", "name": "AIP" }, "author": [ { "@type": "Person", "name": "Byerlee, J. D.", "givenName": "J. D.", "familyName": "Byerlee" } ] }, "OpenAlex": { "abstract_inverted_index": { "A": [ 0 ], "theory": [ 1, 110 ], "of": [ 2, 29, 43, 51, 53, 133, 146, 157, 182 ], "friction": [ 3, 183 ], "is": [ 4, 61, 69 ], "presented": [ 5, 184 ], "that": [ 6, 112, 119 ], "may": [ 7 ], "be": [ 8, 87, 122 ], "more": [ 9 ], "applicable": [ 10 ], "to": [ 11, 78, 86, 90, 179 ], "geologic": [ 12 ], "materials": [ 13, 94 ], "than": [ 14, 127 ], "the": [ 15, 22, 27, 35, 49, 79, 109, 131, 144, 147, 164, 180 ], "classic": [ 16 ], "Bowden": [ 17 ], "and": [ 18, 31, 64, 98, 118, 163, 174 ], "Tabor": [ 19 ], "theory.": [ 20 ], "In": [ 21, 130 ], "model,": [ 23, 81 ], "surfaces": [ 24, 148 ], "touch": [ 25 ], "at": [ 26 ], "peaks": [ 28 ], "asperities": [ 30, 36, 52 ], "sliding": [ 32, 138, 162 ], "occurs": [ 33 ], "when": [ 34 ], "fail": [ 37 ], "by": [ 38 ], "brittle": [ 39 ], "fracture.": [ 40 ], "The": [ 41, 155 ], "coefficient": [ 42 ], "friction,": [ 44 ], "\u03bc,": [ 45 ], "was": [ 46, 84 ], "calculated": [ 47 ], "from": [ 48 ], "strength": [ 50 ], "certain": [ 54 ], "ideal": [ 55, 80 ], "shapes;": [ 56 ], "for": [ 57, 65, 93 ], "cone-shaped": [ 58 ], "asperities,": [ 59, 67 ], "\u03bc": [ 60, 68, 83, 113, 140, 168 ], "about": [ 62, 70 ], "0.1": [ 63 ], "wedge-shaped": [ 66 ], "0.15.": [ 71 ], "For": [ 72 ], "actual": [ 73 ], "situations": [ 74 ], "which": [ 75, 167 ], "seem": [ 76 ], "close": [ 77, 89 ], "observed": [ 82 ], "found": [ 85 ], "very": [ 88 ], "0.1,": [ 91 ], "even": [ 92 ], "such": [ 95 ], "as": [ 96 ], "quartz": [ 97 ], "calcite": [ 99 ], "with": [ 100, 116 ], "widely": [ 101 ], "differing": [ 102 ], "strengths.": [ 103 ], "If": [ 104 ], "surface": [ 105 ], "forces": [ 106 ], "are": [ 107, 153 ], "present,": [ 108 ], "predicts": [ 111 ], "should": [ 114, 121, 141 ], "decrease": [ 115 ], "load": [ 117 ], "it": [ 120 ], "higher": [ 123 ], "in": [ 124, 128, 149, 166 ], "a": [ 125, 134 ], "vacuum": [ 126 ], "air.": [ 129 ], "presence": [ 132 ], "fluid": [ 135 ], "film": [ 136 ], "between": [ 137 ], "surfaces,": [ 139 ], "depend": [ 142 ], "on": [ 143, 170 ], "area": [ 145 ], "contact.": [ 150 ], "Both": [ 151 ], "effects": [ 152 ], "observed.": [ 154 ], "character": [ 156 ], "wear": [ 158 ], "particles": [ 159 ], "produced": [ 160 ], "during": [ 161 ], "way": [ 165 ], "depends": [ 169 ], "normal": [ 171 ], "load,": [ 172 ], "roughness,": [ 173 ], "environment": [ 175 ], "lend": [ 176 ], "further": [ 177 ], "support": [ 178 ], "model": [ 181 ], "here.": [ 185 ] }, "apc_list": { "value": 3500, "currency": "USD", "value_usd": 3500, "provenance": "doaj" }, "apc_paid": null, "authorships": [ { "author_position": "first", "author": { "id": "https://openalex.org/A5050086154", "display_name": "J. 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