Prescribed pattern transformation in swelling gel tubes by elastic instability

Area of Science:

• Materials Science
• Mechanics of Materials
• Soft Matter Physics

Background:

• Swelling of polymers can induce significant internal stresses.
• Constrained swelling in tubular structures can lead to spontaneous shape instabilities.
• Understanding these instabilities is crucial for designing advanced soft materials.

Purpose of the Study:

• To investigate the phenomenon of swelling-induced circumferential buckling in tubular gels.
• To demonstrate experimental control over postbuckling patterns.
• To develop a predictive model for gel buckling behavior.

Main Methods:

• Experimental observation of buckling in tubular gels under swelling conditions.
• Development of an analytical model based on elastic energy principles.
• Numerical simulations to validate experimental and analytical findings.

Main Results:

• Spontaneous buckling instability occurs due to inhomogeneous stress during constrained gel swelling.
• Experimental control over postbuckling patterns was achieved.
• The height to diameter ratio was identified as the critical parameter influencing buckling patterns.

Conclusions:

• The height to diameter ratio is the most critical design parameter for controlling buckling patterns in swelling tubular gels.
• The developed analytical model accurately predicts gel stability and postbuckling behavior.
• Findings provide a pathway for designing and fabricating gels with predictable shapes and functionalities.