Why Soft Contacts Are Stickier When Breaking than When Making Them

Details

• Personal Author:
  Dhinojwala A ; Jacobs TDB ; Kumar N ; Pastewka L ; Sanner A
• Description:
  Soft solids are sticky. They attract each other and spontaneously form a large area of contact. Their force of attraction is higher when separating than when forming contact, a phenomenon known as adhesion hysteresis. The common explanation for this hysteresis is viscoelastic energy dissipation or contact aging. Here, we use experiments and simulations to show that it emerges even for perfectly elastic solids. Pinning by surface roughness triggers the stick-slip motion of the contact line, dissipating energy. We derive a simple and general parameter-free equation that quantitatively describes contact formation in the presence of roughness. Our results highlight the crucial role of surface roughness and present a fundamental shift in our understanding of soft adhesion. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Keywords:
  Adhesive Bonding Elastic Properties Mathematical Models Mechanical Properties Testing Surface Properties
• ISSN:
  2375-2548
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  New York ; Ohio ; OSHA Region 2 ; OSHA Region 3 ; OSHA Region 5 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  10
• Issue:
  10
• NIOSHTIC Number:
  nn:20069479
• Citation:
  Sci Adv 2024 Mar; 10(10):eadl1277
• Contact Point Address:
  Lars Pastewka, Department of Microsystems Engineering (IMTEK), University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
• Email:
  lars.pastewka@imtek.uni-freiburg.de
• Federal Fiscal Year:
  2024
• Performing Organization:
  University of Pittsburgh
• Peer Reviewed:
  True
• Start Date:
  20210930
• Source Full Name:
  Science Advances
• End Date:
  20230929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:85794b389dba65bbfa752845671fc190def5b59cf6decf3779daa1622b68f40b8dac93ada3913a9eba7e92b106f552f88b73a38abe03836c7eaf0d4111885af8
• Download URL:
  https://stacks.cdc.gov/view/cdc/207914/cdc_207914_DS1.pdf
• File Type:
  [PDF - 1.13 MB ]