Damage Behaviour of Shot-Peened 7075 Aluminium Alloy Based on Temperature Evolution and Digital Image Correlation...

Area of Science:

• Materials Science
• Mechanical Engineering
• Surface Engineering

Background:

• Shot peening is crucial for enhancing aluminium alloy properties in aerospace and automotive sectors.
• Shot peening time is a critical parameter influencing material characteristics and performance.

Purpose of the Study:

• To investigate the effects of varying shot peening durations on the mechanical properties, surface roughness, and damage evolution of 7075 aluminium alloy.
• To establish tensile damage evolution equations for different shot peening times.

Main Methods:

• Utilized microhardness testing, laser confocal microscopy, and scanning electron microscopy.
• Employed digital image correlation (DIC) and temperature evolution analysis for damage assessment.

Main Results:

• Microhardness, tensile strength, and surface roughness increased with shot peening time.
• Elongation rate showed a non-monotonic trend (decrease then increase).
• Damage evolution occurred in two stages: smooth development and rapid damage, with consistent laws derived from DIC and temperature analysis.

Conclusions:

• Shot peening duration profoundly influences 7075 aluminium alloy's mechanical behavior and damage progression.
• The study provides a theoretical basis for optimizing peening parameters and predicting material lifespan in engineering applications.