HELP Calculate stress applied to slip direction

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Discussion Overview

The discussion revolves around calculating the stress applied to a slip direction in a single crystal of FCC metal, specifically comparing the yield stress when loads are applied in different crystallographic directions. The context includes theoretical and homework-related aspects of materials science.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant seeks assistance in calculating the yield stress for an FCC metal when the load direction changes from [1 -1 2] to [0 1 4], using the (1 1 1) slip plane.
  • Another participant inquires if the original poster is familiar with calculating resolved stress using the Schmidt factor.
  • A different participant mentions a formula related to calculating resolved stress but indicates that it was not taught in class.
  • One participant suggests referring to the textbook section on critical resolved shear stress for further understanding.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the method to solve the problem, as there are differing levels of familiarity with the necessary concepts and formulas.

Contextual Notes

There is a lack of clarity regarding the application of the Schmidt factor and critical resolved shear stress, as well as the specific formula provided, which may depend on definitions not fully explored in the discussion.

Who May Find This Useful

Students studying materials science, particularly those focusing on crystallography and mechanical properties of materials.

akhanijow
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Hi All,
Im having some trouble in one of my classes and can't figure out how to do the following:

If a single crystal of an FCC metal yields with an applied load of 1MPa in the [1 -1 2] direction, at what stress would the same metal yield if the load were applied in the [0 1 4] direction. The problem can be solved by using (1 1 1) as the slip plane.

Any help would be greatly appreciated! I am pretty sure this class is going to kill me.
 
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Hi akhanijow, welcome to PF. Do you know how to calculate the resolved stress on a certain plane due to a load on another plane? (This is sometimes called the Schmidt factor.)
 
Hi, He never really tought us that in class. He showed us:

(u1u2*v1v2*w1w) / [sqrt(((u1)^2+(v1)^2+(w1)^2) * ((u2)^2+(v2)^2+(w2)^2)
 
What is your textbook? Please read the section on critical resolved shear stress (on a single crystal).

Henceforth, use the Homework & Coursework section of the forums (see my signature) for questions like this.
 

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