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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.8K
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...
2.8K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

1.3K
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
1.3K
Stress-Strain Diagram01:10

Stress-Strain Diagram

7.1K
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...
7.1K
True Stress and True Strain01:28

True Stress and True Strain

1.1K
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...
1.1K
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

580
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...
580

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Related Experiment Video

Updated: Apr 18, 2026

Production of a Strain-Measuring Device with an Improved 3D Printer
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Estimating surgical needle deflection with printed strain gauges.

Frank L Hammond, Michael J Smith, Robert J Wood

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 9, 2015
    PubMed
    Summary

    Tracking surgical needle deflection is crucial for minimizing errors in procedures like biopsies. A novel printing method sensorizes needles, enabling precise deflection monitoring and improving patient safety.

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    Area of Science:

    • Surgical instrumentation
    • Medical device engineering
    • Sensor technology

    Background:

    • Surgical needle deviation can lead to positioning errors and complications in procedures like biopsies and drug delivery.
    • Accurate tracking of needle deflection is essential for improving procedural accuracy and patient outcomes.

    Purpose of the Study:

    • To develop and validate a novel method for sensorizing surgical needles to track their deflection.
    • To enable real-time monitoring of needle shape and deviation during surgical interventions.

    Main Methods:

    • Utilized a novel additive vapor-deposition based printing method to fabricate strain gauges on surgical needles.
    • Applied micron-scale strain gauges and resistive circuit elements onto an 18-gauge core biopsy needle without mechanical machining.
    • Integrated multiple strain gauges to capture needle shape and deflection data.

    Main Results:

    • Demonstrated a gauge factor of 1.16 for the printed strain gauges.
    • Achieved a nominal needle deflection measurement resolution of 500 microns.
    • Successfully sensorized a surgical needle capable of detecting deflections.

    Conclusions:

    • The novel strain gauge printing method enables effective sensorization of surgical needles for deflection tracking.
    • This technology has the potential to reduce procedural complications and improve accuracy in minimally invasive surgeries.
    • Further development could lead to enhanced real-time feedback for surgeons during complex procedures.