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From Recovery to Enhancement: Pressure-Gradient-Driven Crack Repair of Particulate-Reinforced Polymer Composites.

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Title: From Recovery to Enhancement: Pressure-Gradient-Driven Crack Repair of Particulate-Reinforced Polymer Composites.
Authors: Wang, Shengnan1 (AUTHOR), Zhu, Xinqiao2 (AUTHOR), Tang, Wei1,3 (AUTHOR), Wen, Maoping1 (AUTHOR), Lan, Lingang1,2 (AUTHOR), Tian, Xin1,3 (AUTHOR), Yuan, Hongwei1,3 (AUTHOR) yuanhw@caep.cn
Source: Polymers (20734360). Jun2026, Vol. 18 Issue 12, p1485. 16p.
Subjects: Interfaces (Physical sciences), Composite particles (Composite materials), Fractography, Digital image correlation, Computer simulation, Fracture mechanics
Abstract: Particulate-reinforced polymer composites (PRPCs) are susceptible to cracking under tensile loading, severely limiting their service life. Here, we propose a pressure-gradient-driven infiltration method that rapidly repairs narrow (<10 μm) cracks in a highly filled PRPC (95 wt.% BaSO4/5 wt.% fluororubber). Microstructural evidence confirms that the adhesive completely fills the tortuous crack and forms a continuous adhesive–matrix interface capable of supporting load transfer. Semi-circular bend (SCB) testing demonstrates a substantially higher peak load and increased apparent structural stiffness after repair under the present semi-circular bend configuration, indicating apparent mechanical enhancement beyond simple load-bearing recovery. Digital image correlation (DIC) and fracture morphology show that repair suppresses notch-tip strain localization, reduces the strain concentration factor, shifts the failure-controlling zone away from the original notch tip, and deflects the crack propagation path. Phase-field simulations further show that the post-repair load-bearing capacity is governed by the adhesive–matrix interfacial strength; once this strength approaches or exceeds the tensile strength of the intact PRPC (~8.3 MPa), the repaired crack path is stabilized, enabling peak-load enhancement while suppressing damage localization along the original crack path and shifting failure to adjacent weaker regions. Overall, this work establishes a promising crack repair approach for highly filled PRPCs, while the underlying interface-controlled mechanism provides guidance for adhesive selection and repair design. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: From Recovery to Enhancement: Pressure-Gradient-Driven Crack Repair of Particulate-Reinforced Polymer Composites.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Polymers+%2820734360%29%22&quot;&gt;Polymers (20734360)&lt;/searchLink&gt;. Jun2026, Vol. 18 Issue 12, p1485. 16p.
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Particulate-reinforced polymer composites (PRPCs) are susceptible to cracking under tensile loading, severely limiting their service life. Here, we propose a pressure-gradient-driven infiltration method that rapidly repairs narrow (&lt;10 μm) cracks in a highly filled PRPC (95 wt.% BaSO4/5 wt.% fluororubber). Microstructural evidence confirms that the adhesive completely fills the tortuous crack and forms a continuous adhesive–matrix interface capable of supporting load transfer. Semi-circular bend (SCB) testing demonstrates a substantially higher peak load and increased apparent structural stiffness after repair under the present semi-circular bend configuration, indicating apparent mechanical enhancement beyond simple load-bearing recovery. Digital image correlation (DIC) and fracture morphology show that repair suppresses notch-tip strain localization, reduces the strain concentration factor, shifts the failure-controlling zone away from the original notch tip, and deflects the crack propagation path. Phase-field simulations further show that the post-repair load-bearing capacity is governed by the adhesive–matrix interfacial strength; once this strength approaches or exceeds the tensile strength of the intact PRPC (~8.3 MPa), the repaired crack path is stabilized, enabling peak-load enhancement while suppressing damage localization along the original crack path and shifting failure to adjacent weaker regions. Overall, this work establishes a promising crack repair approach for highly filled PRPCs, while the underlying interface-controlled mechanism provides guidance for adhesive selection and repair design. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.3390/polym18121485
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 1485
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      – SubjectFull: Interfaces (Physical sciences)
        Type: general
      – SubjectFull: Composite particles (Composite materials)
        Type: general
      – SubjectFull: Fractography
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      – SubjectFull: Digital image correlation
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      – SubjectFull: Fracture mechanics
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      – TitleFull: From Recovery to Enhancement: Pressure-Gradient-Driven Crack Repair of Particulate-Reinforced Polymer Composites.
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            NameFull: Wang, Shengnan
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            NameFull: Zhu, Xinqiao
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              M: 06
              Text: Jun2026
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              Y: 2026
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