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Related Concept Videos

Stress-Strain Diagram01:10

Stress-Strain Diagram

2.2K
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...
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True Stress and True Strain01:28

True Stress and True Strain

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Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
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Measurements of Strain01:27

Measurements of Strain

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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...
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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...
1.8K
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...
494
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

8.7K
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Measurement of Compressive Stress-Strain Response at Small-Strains.

Jaehyeong Kim1, Sangjun Pyo1, Hyerin Ahn1

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|December 22, 2025
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Summary
This summary is machine-generated.

A new, cost-effective measurement system precisely evaluates material and microdevice mechanical behavior in the small-strain region. This reliable platform offers high accuracy for low-force, small-displacement testing, crucial for advanced material characterization.

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Area of Science:

  • Materials Science and Engineering
  • Mechanical Engineering
  • Microdevice Characterization

Background:

  • Accurate mechanical characterization of materials and microdevices is essential for performance prediction and design.
  • Existing methods may lack precision or cost-effectiveness for small-strain analysis.
  • There is a need for reliable, accessible tools for low-force, small-displacement testing.

Purpose of the Study:

  • To develop and validate a novel, cost-effective measurement system for precise mechanical evaluation in the small-strain region.
  • To enable synchronized force-displacement acquisition with high resolution.
  • To demonstrate the system's reliability and applicability in characterizing materials like polydimethylsiloxane (PDMS).

Main Methods:

  • Integration of a motor-controlled z-stage, microcontroller, operational amplifier, and force sensor for synchronized data acquisition.
  • Custom control software and serial communication for system operation.
  • Calibration of the system against a commercial universal testing machine and validation using a laser displacement meter.

Main Results:

  • Achieved relative error within ±2.0% for force measurement and +0.1% for displacement accuracy.
  • Demonstrated a displacement resolution of 1 µm and a force resolution of 0.01 N.
  • Stress-strain responses closely matched a universal testing machine, with compressive modulus showing +5.3% deviation from reported values.

Conclusions:

  • The developed platform offers a compact, stable, and cost-effective solution for precise small-strain mechanical testing.
  • Validated performance and reproducible calibration confirm its reliability for low-force and small-displacement measurements.
  • Suitable for applications in polymer-based microelectromechanical systems (MEMS), soft robotics, and microneedles requiring accurate material evaluation.