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Related Concept Videos

Fatigue01:21

Fatigue

170
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
170
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

137
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...
137
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

332
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
332

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Related Experiment Video

Updated: May 24, 2025

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Reliability Analysis of Complex PCB Assemblies Under Temperature Cycling and Random Vibration.

Wenchao Tian1,2, Feiyang Li1, Mang He3

  • 1School of Electro-Mechanical Engineering, Xidian University, Xi'an 710000, China.

Micromachines
|March 6, 2025
PubMed
Summary

This study reveals solder material choice significantly impacts PCB assembly reliability under vibration and temperature cycling. Sn63Pb37 excels in vibration resistance, while SAC305 performs better in thermal fatigue, influencing component lifespan.

Keywords:
random vibrationreliabilitytemperature cyclingthermal-force coupling

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Reliability Engineering

Background:

  • Printed circuit board (PCB) assemblies face failure due to random vibration and temperature cycling.
  • Understanding solder joint reliability is crucial for electronic component longevity.
  • Existing research often focuses on single environmental stress, not combined effects.

Purpose of the Study:

  • To evaluate the reliability of complex PCB assemblies under combined random vibration and temperature cycling stresses.
  • To investigate the influence of reinforcement methods and solder joint morphology on assembly failure.
  • To validate finite element simulation models against experimental data for failure prediction.

Main Methods:

  • Utilized a combination of finite element simulation and environmental testing.
  • Employed linear accumulation of damage models for failure prediction.
  • Analyzed the effects of different reinforcement techniques (e.g., bottom fill, corner fixing) and pad diameters.
  • Compared the performance of SAC305 and Sn63Pb37 solder alloys.

Main Results:

  • SAC305 solder shows superior performance in temperature cycling fatigue compared to Sn63Pb37.
  • Sn63Pb37 solder demonstrates significantly higher strength under random vibration fatigue.
  • Reinforcement methods like bottom fill and corner fixing drastically alter fatigue life, with mixed results for temperature cycling vs. vibration.
  • Increasing pad diameter enhances random vibration life but reduces temperature cycling life.

Conclusions:

  • Solder alloy selection (SAC305 vs. Sn63Pb37) critically impacts PCB assembly reliability based on dominant stress type.
  • Specific reinforcement strategies can dramatically improve or degrade fatigue life depending on the environmental stress.
  • Finite element analysis, validated by testing, accurately predicts vulnerable solder joint locations and overall assembly failure.
  • Design choices in solder morphology and reinforcement are essential for optimizing PCB reliability in harsh environments.