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Related Concept Videos

Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

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Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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Design of Transmission Shafts01:16

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The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by...
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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
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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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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Numerical Design of a Thread-Optimized Gripping System for Lap Joint Testing in a Split Hopkinson Apparatus.

Bernardo S Moreira1, Paulo D P Nunes2, Carlos M da Silva1

  • 1Departamento de Engenharia Mecânica, Faculdade de Engenharia (FEUP), Universidade do Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal.

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Summary

This study developed a novel gripping system for testing single lap joint (SLJ) adhesives at high strain rates using the Split Hopkinson Bar (SHB) test. An optimized trapezoidal thread design was identified, validating the system

Keywords:
Single Lap Joint (SLJ)Split Hopkinson Bar (SHB)adhesivegripping systemhigh strain rateimpactthread optimization

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Adhesive Technology

Background:

  • Experimental methods for characterizing adhesive mechanical properties at high strain rates are limited.
  • The Split Hopkinson Bar (SHB) test is a key technique for dynamic mechanical analysis.
  • Single Lap Joint (SLJ) specimens are commonly used for adhesive testing.

Purpose of the Study:

  • To develop and validate a novel gripping system for testing SLJ specimens under high strain rates using the SHB test.
  • To optimize the threaded connection for secure and reliable specimen gripping.
  • To ensure accurate mechanical characterization of adhesives under dynamic loading conditions.

Main Methods:

  • An optimization study was conducted to determine the optimal thread type, diameter, and pitch for the gripping system.
  • Numerical evaluation of the gripping system geometry was performed.
  • The developed gripping system was validated by comparing simulated SHB test results with a validated drop-weight test numerical model.

Main Results:

  • An optimal threaded connection was identified, featuring a trapezoidal thread with a 14 mm diameter and a 2 mm thread pitch.
  • The gripping system was numerically evaluated for its effectiveness in testing SLJ specimens.
  • Validation confirmed the system's ability to accurately capture the load-displacement behavior of SLJs under SHB testing conditions.

Conclusions:

  • A novel and optimized gripping system enables reliable mechanical characterization of SLJ adhesives at high strain rates using the SHB test.
  • The optimized trapezoidal thread design ensures secure specimen gripping for dynamic testing.
  • The validated system provides a crucial advancement for understanding adhesive behavior under extreme conditions.