Question

The critical resolved shear stress (CRSS) determines:

• A. When slip initiates
• B. Dislocation density
• C. Fracture toughness
• D. Twinning behavior

Hint:

CRSS is a crucial parameter in understanding plastic deformation and yield strength of materials.

Answer 1

The Correct Option is A

The critical resolved shear stress (CRSS) is the shear stress required to initiate slip in a crystalline material. Slip is the process by which dislocations move within the crystal lattice, leading to permanent deformation of the material. When the resolved shear stress exceeds the CRSS, dislocations begin to move, initiating slip.
- Dislocation density: While dislocation density affects material strength and behavior, it is not directly determined by the CRSS.
- Fracture toughness: Fracture toughness refers to the material's ability to resist crack propagation, which is not directly related to CRSS.
- Twinning behavior: Twinning occurs when atoms shift positions in a way that causes a mirrored image within the crystal, but it is not determined by CRSS.
Therefore, the correct answer is that CRSS determines when slip initiates.