Adiabatic Shear Localization in Metallic Materials: Review

Area of Science:

• Materials Science
• Mechanical Engineering
• Solid Mechanics

Background:

• High-strain-rate applications demand advanced material performance.
• Adiabatic shear instability (ASB) is a critical phenomenon under these conditions, characterized by large shear strains, high strain rates, and elevated temperatures.
• ASB formation can lead to catastrophic material failure but can be exploited in specific applications like high-speed machining and projectile penetration.

Purpose of the Study:

• To review the fundamental theories behind adiabatic shear band (ASB) formation, focusing on thermal and microstructural softening effects.
• To elucidate the complex deformation mechanisms and temperature changes during shear instability under thermomechanical coupling.
• To identify key challenges and summarize advancements in experimental and computational methods for studying ASB.

Main Methods:

• Review of existing theories on thermal and microstructural softening.
• Analysis of experimental results concerning ASB formation.
• Summary of advancements in experimental characterization techniques.
• Overview of computational modeling approaches for simulating ASB.

Main Results:

• Thermal softening and microstructural softening are identified as foundational theories for ASB formation.
• Complex deformation mechanisms and temperature evolution during shear instability are highlighted.
• Key research challenges in understanding ASB are identified.

Conclusions:

• A deeper understanding of ASB is achieved through advancements in experimental and computational technologies.
• Elucidating thermomechanical coupling and temperature effects is crucial for managing material behavior under high-strain-rate conditions.
• Further research is needed to address identified challenges in the field of shear instability.