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Mechanically programmed shape change in laminated elastomeric composites.

Jaimee M Robertson1, Amir H Torbati, Erika D Rodriguez

  • 1Syracuse Biomaterials Institute and Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA. ptmather@syr.edu.

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Summary
This summary is machine-generated.

Researchers developed a novel anisotropic shape memory elastomeric composite (A-SMEC). This material exhibits predictable coiling upon stretching, offering a breakthrough in soft, shape-changing materials for aerospace and medical applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • Nature features soft, anisotropic materials like myocardium and extracellular matrix, crucial for function.
  • Anisotropy enables specialized responses, but developing such soft synthetic materials is challenging.
  • Previous work introduced an anisotropic shape memory elastomeric composite (A-SMEC) with anisotropic shape-fixing properties.

Purpose of the Study:

  • To exploit the anisotropy of A-SMECs for novel shape-changing behaviors.
  • To achieve non-affine shape change (coiling) through simple room-temperature tensile deformation (mechanical programming).
  • To investigate the influence of fiber orientation and strain on coiling geometry and validate with a predictive model.

Main Methods:

  • Bonding laminates of A-SMEC with oblique anisotropy.
  • Applying tensile deformation at room temperature for mechanical programming.
  • Developing a model to capture the viscoplastic response of A-SMECs for validation.

Main Results:

  • Stretching layered A-SMECs at room temperature induced coiling, a breakthrough in mechanical programming.
  • The pitch and curvature of coiled geometries were found to depend on fiber orientations and programmed strain.
  • A developed model accurately predicted the viscoplastic response and correlated well with experimental data.

Conclusions:

  • Anisotropic shape memory elastomeric composites can achieve predictable coiling through simple mechanical programming.
  • The study demonstrates control over coiled geometries by manipulating material anisotropy and strain.
  • These smart, soft, shape-changing materials hold promise for aerospace and medical applications.