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Related Concept Videos

Fatigue01:21

Fatigue

237
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...
237
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

281
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...
281
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

265
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
265
Microcracking in Concrete01:20

Microcracking in Concrete

203
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
203
Creep in Concrete01:22

Creep in Concrete

433
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
433
Plastic Behavior01:21

Plastic Behavior

259
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...
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Fatigue Crack Arrest Induced by Localized Compressive Deformation.

Edú R Barragán1, Ricardo R Ambriz1, José A Frutos1

  • 1Instituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Mexico City 02250, Mexico.

Materials (Basel, Switzerland)
|July 9, 2022
PubMed
Summary

Localized compressive deformation (LCD) effectively arrests fatigue crack growth in 7075-T651 aluminum alloy. Higher compressive forces significantly increase crack arrest duration, with complete arrest observed at 15.5 kN.

Keywords:
7075-T651 aluminum alloycrack tipfatigue crack arrestlocalized compressive deformation

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Metallurgy

Background:

  • Fatigue crack growth is a critical failure mechanism in metallic alloys.
  • 7075-T651 aluminum alloy is widely used in aerospace applications.
  • Controlling fatigue crack propagation is essential for structural integrity.

Purpose of the Study:

  • To investigate the effect of localized compressive deformation (LCD) on fatigue crack growth.
  • To quantify the crack arrest behavior induced by LCD in 7075-T651 aluminum alloy.
  • To establish the relationship between LCD force and crack arrest duration.

Main Methods:

  • Eccentrically loaded single-edge crack tension (ESE(T)) specimens of 7075-T651 aluminum alloy were used.
  • Specimens were pre-cracked, followed by LCD application using a semi-spherical indenter at various forces (5.0–15.5 kN).
  • Fatigue testing continued post-LCD to evaluate crack growth and arrest behavior, measuring crack length and crack tip opening displacement (CTOD).

Main Results:

  • A direct correlation was observed between the applied compressive force during LCD and the delay in fatigue crack propagation.
  • Crack arrest was evident at a compressive force of 5.0 kN, resulting in approximately 9000 delayed cycles.
  • Increasing compressive force led to longer crack arrest periods, with complete arrest achieved at 15.5 kN (no growth after >3x10^6 cycles).

Conclusions:

  • Localized compressive deformation is an effective method for mitigating fatigue crack growth in 7075-T651 aluminum alloy.
  • The degree of crack arrest is directly proportional to the magnitude of the compressive force applied during LCD.
  • LCD offers a promising strategy for enhancing the fatigue life and structural reliability of aluminum components.