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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

467
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
467
Plastic Deformations01:14

Plastic Deformations

453
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
453
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

407
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
407
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

521
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
521
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

479
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
479
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

924
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
924

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Cell Patterning on Photolithographically Defined Parylene-C: SiO2 Substrates
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Photolithographically Patterned Hydrogels with Programmed Deformations.

Chen Yu Li1, Xing Peng Hao1, Zi Liang Wu1

  • 1Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.

Chemistry, an Asian Journal
|September 22, 2018
PubMed
Summary
This summary is machine-generated.

This review explores programmed deformations in hydrogels, focusing on how structural control via photolithography enables self-morphing materials for applications like soft robotics and biomedical devices.

Keywords:
gradient structureshydrogelsphotolithographyprogrammed deformations

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials Engineering

Background:

  • Programmed deformations are crucial for self-morphing materials in fields like biomedical devices and soft robotics.
  • Hydrogels are ideal for studying deformation principles and structure-deformation relationships due to their versatility.
  • Creating heterogeneous hydrogel structures is key for controlled material behavior.

Purpose of the Study:

  • To review deformation modes and structural features of hydrogels.
  • To highlight photolithography as a method for controlling hydrogel shape and component distribution.
  • To explain how patterned hydrogels achieve programmed internal stress and controllable deformations.

Main Methods:

  • Focus review of existing literature on hydrogel deformations.
  • Analysis of photolithography techniques for patterning hydrogels.
  • Examination of cooperative deformations in periodically patterned hydrogels.
  • Investigation of selective preswelling for directing hydrogel buckling.

Main Results:

  • Photolithography enables precise control over hydrogel shape and internal structure.
  • Patterned hydrogels exhibit programmed internal stress, leading to controllable deformations.
  • Cooperative deformations occur in hydrogels with in-plane gradients.
  • Selective preswelling can induce multiple morphing structures within a single hydrogel.

Conclusions:

  • Structural control strategies and deformation principles in hydrogels are well-defined.
  • These principles offer a pathway for designing advanced self-morphing materials.
  • The findings are applicable to other materials, broadening potential applications.