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Related Concept Videos

Impact Loading01:19

Impact Loading

181
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
181
Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

363
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
363
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

242
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
242
Fatigue01:21

Fatigue

171
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
171
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

138
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
138
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

159
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
159

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Updated: May 29, 2025

A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
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A material dynamically enhancing both load-bearing and energy dissipation capability under cyclic loading.

Bohan Sun1,2, Grant Kitchen2,3, Dongjing He4

  • 1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA.

Science Advances
|February 7, 2025
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Summary
This summary is machine-generated.

A novel liquid-infused porous piezoelectric scaffold (LIPPS) significantly enhances load-bearing and energy dissipation under cyclic loading. This self-healing material offers improved resilience and sustainability for various applications.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Biomaterials

Background:

  • Material degradation under cyclic loading leads to failure, increasing costs.
  • Optimizing load-bearing and energy dissipation simultaneously is challenging.
  • Existing materials often exhibit trade-offs between different performance properties.

Purpose of the Study:

  • To develop a material that enhances both load-bearing and energy dissipation under cyclic loading.
  • To investigate the self-healing and shape-changing capabilities of the developed material.
  • To explore applications in soft robotics, infrastructure, and tissue engineering.

Main Methods:

  • Fabrication of a liquid-infused porous piezoelectric scaffold (LIPPS).
  • Cyclic loading tests to evaluate material performance over 12 million cycles.
  • Computed Tomography (CT) studies to analyze microstructural changes.
  • Stiffness distribution analysis and self-folding experiments.

Main Results:

  • LIPPS demonstrated a 3600% increase in modulus and 3000% increase in hysteresis after 12 million cycles.
  • Self-recoverable mineralization under mechanical loading was identified as the key mechanism.
  • Reprogrammable stiffness distribution enabled self-folding and shape generation.
  • The material exhibited enhanced resilience and sustainability.

Conclusions:

  • LIPPS offers simultaneous enhancement of load-bearing and energy dissipation.
  • The self-healing and shape-morphing properties open new avenues for material design.
  • This innovation promises significant advancements in soft robotics, infrastructure, and regenerative medicine.