Mechanical Engineering Design
2018-1-19u2002·u2002Mechanical Engineering Design Mohammed Midhat Hasan (σx + σy)/2.Comparing Eqs. (1–3) and (1–4), we see that tan 2ϕs is the negative reciprocal of tan 2ϕp.This means that 2ϕs and 2ϕp are angles 90° apart, and thus the angles between the surfaces containing
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