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Competing failure modes in finite adhesive pads
Tal Cohen1, Chon U Chan, L Mahadevan
1Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
Soft Matter
|February 6, 2018
Summary
Adhesive pad failure depends on pad shape. Long pads peel from the edge, while short pads curl unstably, revealing adhesive bond stiffness as a key factor.
Area of Science:
- Materials Science
- Adhesion Science
- Mechanics of Materials
Background:
- Thin adhesive pads are crucial for object attachment but prone to catastrophic failure.
- Understanding failure modes is essential for improving adhesive performance.
Purpose of the Study:
- To investigate the failure mechanisms of thin adhesive pads under parallel loading.
- To identify factors limiting the load-bearing capacity of adhesive pads.
Main Methods:
- Experimental analysis of finite adhesive pads with soft adhesive layers and stiff backings.
- Loading pads parallel to the substrate surface to observe failure modes.
Main Results:
- Two distinct peeling mechanisms were observed: interfacial peeling for long pads and unstable curling for short pads.
- Adhesive bond stiffness was identified as a critical parameter influencing the peeling mode.
- A phase diagram was developed to map different peeling regimes based on pad slenderness and stiffness.
Conclusions:
- The study elucidates two primary failure modes in adhesive pads, dependent on their slenderness.
- Unstable curling failure may be more prevalent than previously assumed and relevant to natural adhesion phenomena.
- Adhesive bond stiffness is a key determinant of failure mechanism, offering insights for material design.
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