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Thermal Strain

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...

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Related Experiment Video

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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

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Published on: May 15, 2017

A new method for detecting heteromorphic workpiece brazing layer quality based on thermal probe.

Chaoxu Hu¹, Shiwei Feng¹, Yamin Zhang¹

¹Faculty of Information Technology, College of Microelectronics, Beijing University of Technology, Beijing 100124, China.

The Review of Scientific Instruments

|September 2, 2021

Summary

A new thermal probe non-destructive testing method effectively detects brazing defects in complex workpieces. This advanced technique improves quality control and workpiece reliability, outperforming traditional methods and X-ray inspections.

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Area of Science:

Materials Science
Non-Destructive Testing
Manufacturing Engineering

Background:

Traditional brazing quality inspection struggles with defects in complex, heteromorphic workpieces.
Existing methods lack the sensitivity for intricate structures, impacting product reliability.

Purpose of the Study:

To develop a novel non-destructive testing (NDT) technology for detecting brazing layer defects.
To evaluate the effectiveness of a thermal probe-based method for complex workpiece structures.

Main Methods:

Scanning thermal resistance testing and analysis on diverse workpiece samples.
Development of an evaluation calculation method for brazing effect characterization.
Verification via ANSYS thermal simulations and comparison with X-ray methods.

Main Results:

The thermal probe method effectively identifies brazing defects in heteromorphic and complex structures.
A proposed evaluation method accurately characterizes brazing quality.
The technique demonstrated superiority over X-ray inspection in specific applications.

Conclusions:

The developed thermal probe NDT method is reliable for evaluating brazing quality in complex geometries.
This technology enhances workpiece reliability and quality control in manufacturing.
The method offers a superior alternative to traditional inspection techniques for challenging parts.