{
  "schemaVersion": 1,
  "retrievedAt": "2026-09-28",
  "id": "cornell-hdpe-2025",
  "title": "Two HDPE samples, five tensile tests each",
  "citation": "Hu, J.; Sparrow, Z. M.; Ernst, B. G.; Mattes, S. M.; Coates, G. W.; DiStasio, R. A.; Fors, B. P. (2025). Compound data for Designing Polymers with Molecular Weight Distribution Based Machine Learning. Cornell University eCommons.",
  "doi": "10.1021/jacs.4c16325",
  "sourceUrl": "https://ecommons.cornell.edu/entities/publication/e6e21519-24d9-4330-b151-0facb0d48e1d",
  "persistentUrl": "https://hdl.handle.net/1813/116990",
  "license": {
    "name": "CC0 1.0 Universal",
    "url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "scope": "The Cornell eCommons dataset and README. The separately linked article supporting information has its own CC BY-NC 4.0 license and is not redistributed here."
  },
  "supportingInformation": {
    "url": "https://doi.org/10.1021/jacs.4c16325.s001",
    "sampleIdentityLocator": "Table S1, page 8; Cornell sample-blends key, rows 3 and 4",
    "mechanicalStatisticsLocator": "Table S6, page 57",
    "methodLocator": "General Procedure for Uniaxial Tensile Testing, page 45"
  },
  "conditions": {
    "instrument": "Shimadzu Autograph AGS-X",
    "crossheadSpeedMmMin": 10,
    "gaugeLengthMm": 10,
    "nominalMoldWidthMm": 2.6,
    "nominalMoldThicknessMm": 0.6,
    "testTemperatureC": null,
    "humidityPercent": null,
    "testStandard": null,
    "conditioning": null,
    "preparation": "BHT was added before pressing. Sheets were pressed at 160 °C and about 9 MPa for 2 min, folded and repressed twice. Dogbones were pressed at 160 °C and about 9 MPa for 5 min, then cooled under pressure at about 10 °C/min and trimmed.",
    "strainDefinition": "Author-exported strain (%). In these files it is consistent with 100 × Stroke (mm) / 10 mm. This is crosshead-based strain; an independent extensometer measurement is not documented.",
    "stressDefinition": "Author-exported stress (N/mm² = MPa). In these files Force/Stress is about 1.25 mm². Preserve the reported Stress column; the README nominal mold dimensions give 1.56 mm² and do not establish the area used by the instrument.",
    "forceDefinition": "Author-exported Force in N; no conversion applied.",
    "strokeDefinition": "Author-exported Stroke in mm; no conversion applied.",
    "sampling": "Time increments are 0.3 s, corresponding to about 0.5 percentage point of strain."
  },
  "limitations": [
    "These are measurements by Hu and colleagues, not measurements by Mol2Mat or Felix.",
    "The samples are research-synthesised HDPE identified by the authors. They are not the commercial Lupolen grades in the separate reference table.",
    "Test temperature, humidity, conditioning duration and an ISO/ASTM test designation are not reported in the cited method.",
    "Crosshead displacement can include grip and machine compliance. Do not present a slope fitted to these curves as an ISO small-strain tensile modulus.",
    "The nominal mold area (1.56 mm²) differs from the area implicit in the exported force/stress values (about 1.25 mm²). The reason is not established; do not silently replace the authors’ stress values.",
    "Values at the final recorded point agree with the authors’ rounded break statistics for this subset. The files do not include a post-fracture force drop or local necking measurements.",
    "Similar chemical repeat units do not imply identical performance. These two samples differ in molecular-weight distribution; this comparison alone does not isolate every structural contribution.",
    "The curves are neither smoothed nor resampled. Small negative initial force/stress values remain in the original and processed files."
  ],
  "columns": [
    {
      "key": "timeSeconds",
      "unit": "s",
      "sourceColumn": "Time"
    },
    {
      "key": "forceN",
      "unit": "N",
      "sourceColumn": "Force"
    },
    {
      "key": "strokeMm",
      "unit": "mm",
      "sourceColumn": "Stroke"
    },
    {
      "key": "stressMPa",
      "unit": "MPa",
      "sourceColumn": "Stress (N/mm2)"
    },
    {
      "key": "strainPercent",
      "unit": "%",
      "sourceColumn": "Strain"
    }
  ],
  "samples": [
    {
      "id": "003",
      "label": "PE 38",
      "composition": "Research HDPE; sample 003 is entirely the authors’ PE 38 base polymer.",
      "numberAverageMolecularMassKDa": 38,
      "weightAverageMolecularMassKDa": 42,
      "dispersity": 1.1,
      "reportedBreakStressMPa": 26.1,
      "reportedBreakStressSdMPa": 0.7,
      "reportedBreakStrainPercent": 13,
      "reportedBreakStrainSdPercent": 1,
      "repeatCount": 5,
      "runIds": [
        "003-a",
        "003-b",
        "003-c",
        "003-d",
        "003-e"
      ],
      "endpointMeanStressMPa": 26.142556,
      "endpointSdStressMPa": 0.7185190510557107,
      "endpointMeanStrainPercent": 12.960666,
      "endpointSdStrainPercent": 0.5471154194774627
    },
    {
      "id": "004",
      "label": "PE 98",
      "composition": "Research HDPE; sample 004 is entirely the authors’ PE 98 base polymer.",
      "numberAverageMolecularMassKDa": 98,
      "weightAverageMolecularMassKDa": 110,
      "dispersity": 1.1,
      "reportedBreakStressMPa": 32.7,
      "reportedBreakStressSdMPa": 1.6,
      "reportedBreakStrainPercent": 1640,
      "reportedBreakStrainSdPercent": 197,
      "repeatCount": 5,
      "runIds": [
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        "004-b",
        "004-c",
        "004-d",
        "004-e"
      ],
      "endpointMeanStressMPa": 32.663218,
      "endpointSdStressMPa": 1.6210985221355312,
      "endpointMeanStrainPercent": 1640.3594,
      "endpointSdStrainPercent": 196.61304941635996
    }
  ],
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    "readmePath": "/research/mechanics/cornell-hdpe-2025/README-source.txt",
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    "sampleKeyPath": "/research/mechanics/cornell-hdpe-2025/sample-blends-source.csv",
    "archiveUrl": "https://ecommons.cornell.edu/bitstreams/7c526f1a-dccc-4310-a966-847b7f8972d0/download",
    "archiveName": "PEPPr_Model_tensile.zip",
    "archiveBytes": 37320168,
    "archiveSha256": "9b9c5a599aeea0b830edc02eaeacf9afdcc8be4ba64c46c67aa82c6830bdd78a",
    "transformation": "Extract only samples 003 and 004, all five provided runs A–E each. Preserve original CSV bytes. In processed CSV retain all rows and the first five named columns; remove the instrument header/units rows and duplicate/unnamed analysis columns. Rename headers to timeSeconds,forceN,strokeMm,stressMPa,strainPercent. Preserve numeric strings exactly, with no smoothing, interpolation, baseline correction or curve reconstruction."
  },
  "analysisGuidance": {
    "initialComparisonStrainPercent": 10,
    "comparisonReason": "All ten measured traces bracket 10% strain. Exact values at 10% require disclosed interpolation between adjacent measured points.",
    "recommendedSlopeInterval": null,
    "slopeNote": "No default fit: sampling is approximately 0.5 percentage point of strain and the early response is nonlinear. A selected-interval slope is not an ISO tensile modulus."
  }
}