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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

617
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
617
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

257
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.
257
Stress-Strain Diagram01:10

Stress-Strain Diagram

610
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
610
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

449
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
449
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

176
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.
176
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

182
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
182

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Updated: Jun 17, 2025

Intermediate Strain Rate Material Characterization with Digital Image Correlation
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Intermediate Strain Rate Material Characterization with Digital Image Correlation

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Strain Measurement during Quasi-Static and Cyclic Loads in AL-6XN Material Using Digital Image Correlation Technique.

Donovan Ramírez-Acevedo1, Ricardo Rafael Ambriz1, Christian Jesús García1

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

Materials (Basel, Switzerland)
|August 10, 2024
PubMed
Summary

A customized digital image correlation (DIC) system accurately measured strain in AL-6XN stainless steel. DIC identified high-strain zones, predicting fatigue crack initiation sites in low-cycle fatigue tests.

Keywords:
AL-6XNdigital image correlationloading–unloadinglow cycle fatiguestrain monitoring

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Cold-rolled AL-6XN stainless steel is crucial for demanding applications.
  • Accurate strain measurement is vital for understanding material behavior under load.
  • Conventional extensometers have limitations in capturing localized strain.

Purpose of the Study:

  • To implement and validate a customized digital image correlation (DIC) system for strain monitoring in AL-6XN stainless steel.
  • To compare DIC strain measurements with conventional extensometers.
  • To investigate fatigue crack initiation using DIC during low-cycle fatigue tests.

Main Methods:

  • A customized digital image correlation (DIC) system was developed and applied.
  • Quasi-static and cyclic loading tests were performed on 3.0 mm thick AL-6XN stainless steel plates.
  • DIC strain measurements were compared against conventional extensometer data.

Main Results:

  • The DIC system accurately captured the true stress-strain behavior of AL-6XN stainless steel.
  • DIC measurements showed good agreement with conventional extensometers.
  • Strain mapping by DIC identified localized high-strain zones in low-cycle fatigue tests, correlating with potential crack initiation sites.

Conclusions:

  • The customized DIC system is a reliable tool for precise strain measurement in AL-6XN stainless steel.
  • DIC effectively identifies critical high-strain regions that act as precursors to fatigue crack initiation.
  • This technique enhances the understanding of fatigue life and failure mechanisms in metallic materials.