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Related Concept Videos

Fatigue01:21

Fatigue

255
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...
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Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
279
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

220
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

300
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
300
Hooke's Law01:26

Hooke's Law

589
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
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Shape Memory Alloy-Polymer Composites: Static and Fatigue Pullout Strength under Thermo-Mechanical Loading.

Stefano Rodinò1, Elio M Curcio1, Danilo A Renzo1

  • 1Department of Mechanical Energy and Management Engineering, University of Calabria, 87036 Rende, CS, Italy.

Materials (Basel, Switzerland)
|May 20, 2022
PubMed
Summary

Shape memory alloy (SMA) integration in polymer matrix composites (PMC) significantly reduces interface strength under combined thermal and mechanical loads. This limits design stresses for automotive active aerodynamic systems.

Keywords:
pull out strengthshape memory alloyssmart compositesthermo-mechanical fatigue

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Composite Materials

Background:

  • Morphable polymer matrix composites (PMC) actuated by shape memory alloys (SMA) are explored for automotive active aerodynamic systems.
  • A critical challenge is the limited strength of metal-polymer interfaces in SMA-PMC integration.

Purpose of the Study:

  • To analyze critical issues in SMA-polymer integration, focusing on interface strength under thermo-mechanical loading.
  • To evaluate the impact of SMA thermal activation on the mechanical performance of SMA-PMC interfaces.

Main Methods:

  • Selection of materials with suitable thermo-mechanical properties to prevent premature SMA activation or polymer damage.
  • Manufacturing of nonstandard samples (SMA wires in resin blocks) for static and fatigue pullout tests.
  • Conducting fully coupled thermo-mechanical simulations with a specialized SMA constitutive model.

Main Results:

  • SMA thermal activation severely affects adhesion strength due to recovery forces and temperature increase.
  • Nominal pullout stress reduced from 940 MPa (static mechanical load) to 280 MPa (combined thermal and mechanical loads).
  • Fatigue testing achieved 5000 cycles at approximately 200 MPa under combined loads.

Conclusions:

  • The study identifies key design limitations for SMA/PMC systems related to maximum allowable stresses during static and cyclic actuation.
  • Understanding these limitations is crucial for developing reliable active aerodynamic systems.