I do understand that $ \mathbf b||\mathbf t$ for screw dislocation but I am unable to judge the sign of the dislocation. Again if $\mathbf b \perp \mathbf t$ how do I judge its sign? Any formula which explains the sign and magnitude (to some extent) will be highly appreciated. Here, $\mathbf{b}$ is the Burger's vector and $\mathbf{t}$ is the tangent vector.
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1$\begingroup$ +1 but can you tell us where you found this question? Is your $\mathbf{t}$ the "applied sheer stress" which is often denoted as $\mathbf{\tau}$? $\endgroup$– Nike DattaniJan 11, 2021 at 6:40
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$\begingroup$ @NikeDattani Thanks.I found this question in GATE Metallurgical Engineering question papaer(which is precisely a competitive examination at the Undergrad level in India).$t$ is precisely the tangent vector.It has nothing to do with the applied shear stress. $\endgroup$– user586228Jan 11, 2021 at 7:45
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