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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Stress-Strain Diagram01:10

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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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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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Temperature Measurement Sites01:14

Temperature Measurement Sites

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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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A Proposed System for Temperature Measurement During Tensile Testing.

Marius Andrei Mihalache1, Vasile Merticaru1, Vasile Ermolai1

  • 1Department of Machine Manufacturing Technology, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania.

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Summary

This study integrates thermographic imaging with scanning electron microscopy (SEM) to quantify thermal-mechanical behavior in 3D-printed polymers during tensile testing. Findings reveal temperature fluctuations at fracture, impacting material integrity and providing insights into fracture mechanics.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • 3D-printed polymers exhibit complex thermal-mechanical behavior during tensile testing.
  • Understanding fracture mechanics in these materials requires analyzing associated thermal phenomena.
  • Current methods may not fully capture in-situ thermal changes during material failure.

Purpose of the Study:

  • To develop and validate a custom setup integrating thermographic imaging with in-situ scanning electron microscopy (SEM) for tensile testing of 3D-printed polymers.
  • To quantify the thermal-mechanical behavior and associated thermal phenomena during fracture.
  • To demonstrate the sensitivity of thermal measurement systems to variations in mechanical response due to printing parameters.

Main Methods:

  • Integration of thermographic imaging with in-situ scanning electron microscopy (SEM) during tensile testing.
  • Utilizing Analysis of Variance (ANOVA) within Design of Experiments (DOE) to analyze factors and interactions.
  • Employing the Finite Element Method (FEM) to model and confirm temperature distribution.
  • Conducting laboratory experiments with 3D-printed polymer samples subjected to tensile loads.

Main Results:

  • Thermographic imaging successfully detected temperature fluctuations upon sample fracture.
  • Variations in mechanical response due to controlled printing parameter changes were identified.
  • SEM analysis provided insights into fracture modes, correlating with thermal data.
  • FEM simulations confirmed the recorded thermal field data.

Conclusions:

  • The custom setup provides a reliable assessment system for quantifying thermal-mechanical behavior in 3D-printed polymers during tensile testing.
  • This approach offers a valuable alternative to sensor-based environments for validating thermal measurement approaches.
  • The findings contribute to a deeper understanding of fracture mechanics and material integrity in additively manufactured polymers.