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Understanding stress on an oblique plane under axial loading is pivotal in material mechanics. This analysis offers insight into a material's durability and strength, which is crucial for civil engineering and structural design. Axial loading refers to force application along the material's central axis, causing compression or elongation and leading to normal stress. Normal stress occurs when a force acts perpendicularly to the material's area, resulting in compressive or tensile...
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Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
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Unconstrained 3D Shape Programming with Light-Induced Stress Gradient.

Cheng Liu1, Yizheng Tan1, Chaowei He1

  • 1Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China.

Advanced Materials (Deerfield Beach, Fla.)
|September 3, 2021
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Summary
This summary is machine-generated.

Researchers developed light-controlled shape programming for 2D polymer sheets. This innovation simplifies creating complex 3D structures for flexible electronics and soft robots without external forces.

Keywords:
3D shape programmingdynamic covalent bondlight-induced stress gradientshape-memory material

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Robotics

Background:

  • Programming 2D sheets into 3D shapes is crucial for flexible electronics, soft robots, and biomedical devices.
  • Current stress regulation methods often require external forces, complicating processing setups.

Purpose of the Study:

  • To achieve unconstrained shape programming of 2D polymer sheets into 3D shapes using light.
  • To simplify programming setups by enabling materials to self-regulate and release internal stress.

Main Methods:

  • Incorporating dynamic diselenide bonds into shape-memory materials.
  • Utilizing light irradiation to induce stress gradients and trigger shape changes.
  • Employing sequential deformation for remote-controlled 4D assembly and actuation.

Main Results:

  • Demonstrated light-induced, self-regulated stress holding and release via the shape-memory effect.
  • Achieved complex out-of-plane deformations and 3D configurations from 2D sheets using light-triggered stress gradients.
  • Showcased remote-controlled 4D assembly, object transportation, self-lifting, and 3D microscopic pattern generation.

Conclusions:

  • Dynamic diselenide bonds in shape-memory materials enable unconstrained, light-controlled 3D shape programming.
  • This method simplifies programming, enhances resolution and complexity, and offers significant potential for soft robots, smart actuators, and anti-counterfeiting applications.