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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
163
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

148
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
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Method of Joints01:30

Method of Joints

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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint.
Since plane truss members are in the same plane, each joint is subjected to a coplanar and concurrent force system. To apply the method of joints, the first step is to...
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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

114
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
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Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

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When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
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Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research
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PMUT-Based System for Continuous Monitoring of Bolted Joints Preload.

Stefano Sanvito1, Marco Passoni2, Domenico Giusti3

  • 1Department of Engineering and Applied Science, University of Bergamo, Via Galvani, 2, 24044 Dalmine, Italy.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel bolt preload monitoring system using a Piezoelectric Micromachined Ultrasonic Transducer (PMUT). The system measures changes in acoustic wave time-of-flight for accurate, low-cost, continuous bolt load monitoring.

Keywords:
MEMSPMUTbolt preloadbolted jointfinite elements methodnon-destructive testingpiezoelectric micromachined ultrasonic transducerstructural health monitoringultrasound

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Bolt preload is critical for structural integrity and safety in various engineering applications.
  • Existing methods for monitoring bolt preload can be costly, complex, or unsuitable for continuous field use.
  • Accurate and real-time preload monitoring is essential for preventing structural failures and ensuring operational safety.

Purpose of the Study:

  • To develop and validate a novel, low-cost bolt preload monitoring system.
  • To investigate the use of Piezoelectric Micromachined Ultrasonic Transducers (PMUTs) for measuring bolt preload.
  • To demonstrate the feasibility of using the Change in Time-of-Flight (CTOF) of acoustic waves for preload quantification.

Main Methods:

  • System architecture design and algorithm development for bolt preload monitoring.
  • Finite Element Method (FEM) simulations to optimize transducer configuration and analyze wave propagation.
  • Experimental validation using PMUTs in pulse-echo mode to measure CTOF under varying load conditions.
  • Development of a novel assembly process with an elastomeric acoustic impedance matching layer for PMUT-bolt coupling.

Main Results:

  • Successful experimental measurement of bolt preload using PMUTs and CTOF, achieving a good signal-to-noise ratio.
  • FEM simulations provided insights into wave propagation and the influence of various parameters on measurement accuracy.
  • Demonstrated the effectiveness of the novel acoustic coupling method for reliable signal transmission.
  • Achieved, for the first time, experimental bolt preload measurement with PMUTs.

Conclusions:

  • The developed PMUT-based system offers a viable, low-cost solution for bolt preload monitoring.
  • The CTOF measurement technique shows significant potential for continuous, in-situ monitoring of bolt integrity.
  • The system's small size and low cost make it suitable for widespread field applications throughout a bolt's service life.