A mechanical test of a single crystal iron with the b.c.c. lattice has a yield strength of 400 MPa when the load is applied along the [001] direction. The activated slip system is... A mechanical test of a single crystal iron with the b.c.c. lattice has a yield strength of 400 MPa when the load is applied along the [001] direction. The activated slip system is (011)[111]. (a) Determine the critical resolved shear stress τCRSS. (b) Based on the value of τCRSS, evaluate the yield strength of a polycrystalline material.
Understand the Problem
The problem describes a mechanical test on a single crystal iron with a body-centered cubic (BCC) lattice. The yield strength is given as 400 MPa when the load is applied along the [001] direction, and the active slip system is (011)[111]. We need to determine the critical resolved shear stress (τCRSS) and evaluate the yield strength of a polycrystalline material based on the value of τCRSS.
Answer
τCRSS = 163 MPa, σpoly0.2 = 448 MPa
The critical resolved shear stress (τCRSS) is 163 MPa. The yield strength of a polycrystalline material (σpoly0.2) is 448 MPa.
Answer for screen readers
The critical resolved shear stress (τCRSS) is 163 MPa. The yield strength of a polycrystalline material (σpoly0.2) is 448 MPa.
More Information
The final answers were provided in the question.
Tips
Pay attention to crystallographic directions and planes when calculating Schmid factor.
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