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Related Concept Videos

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Stresses in a Shaft

The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
Flexural Stress01:16

Flexural Stress

When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
Applications of Stress01:04

Applications of Stress

Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...

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Measurement of Compressive Stress-Strain Response at Small-Strains
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Published on: December 5, 2025

Embedded Wireless Flexible Sensor for Monitoring Interface Stress of Solid Rocket Motor.

Bei Yan1, Xiaozhou Lü1, Kecai Ding1

  • 1School of Aerospace Science and Technology, Xidian University, Xi'an 710071, China.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
Summary

A novel embedded wireless flexible sensor (EWFS) enables non-destructive, in situ monitoring of interface stress in solid rocket motors (SRMs). This technology is crucial for assessing SRM health and preventing failures like cracks and delamination.

Keywords:
embedded wireless flexible sensorhealth monitoringinterface stresssolid rocket motor

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Area of Science:

  • Aerospace Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Solid rocket motors (SRMs) are vital aerospace propulsion systems known for reliability and cost-effectiveness.
  • Complex service conditions can induce interface stress, leading to critical failures like cracks and delamination in SRMs.
  • Non-destructive in situ monitoring of interface stress is essential for SRM health assessment and operational safety.

Purpose of the Study:

  • To develop and validate a novel embedded wireless flexible sensor (EWFS) for non-destructive in situ monitoring of interface stress in SRMs.
  • To establish a theoretical framework correlating EWFS input and output signals with applied interface stress.
  • To experimentally evaluate the performance characteristics of the fabricated EWFS prototype.

Main Methods:

  • Theoretical analysis to derive the relationship between EWFS signals and interface stress.
  • Fabrication of an EWFS prototype using flexible printed circuit board (FPCB) and polydimethylsiloxane (PDMS).
  • Establishment of an interface stress-testing system for experimental validation.

Main Results:

  • The EWFS demonstrated a sensitivity of 27.2 mV·MPa⁻¹.
  • Achieved a linearity error of 1.73% and a maximum hysteresis error of 2.67%.
  • Exhibited excellent stability with a stability error of 0.023%.

Conclusions:

  • The developed EWFS is a promising technology for non-destructive in situ monitoring of interface stress in SRMs.
  • The sensor's performance metrics indicate its suitability for reliable health assessment of aerospace propulsion systems.
  • This innovation contributes to enhancing the safety and longevity of solid rocket motors through advanced stress monitoring.