Tham khảo tài liệu 'mechanics of solids 2011 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1-70 Section 1 FIGURE Mohr s circle. 4. The principal stresses ƠJ and Ơ2 are on the Ơ axis r 0 . 5. The planes on which Ơ 1 and Ơ2 act are oriented at 2Qp from the planes of 5x and 5y respectively in the circle and at 0p in the element. 6. The stresses on an arbitrary plane can be determined by their Ơ and T coordinates from the circle. These coordinates give magnitudes and signs of the stresses. The physical meaning of t vs. -T regarding material response is normally not as distinct as o vs. -Ơ tension vs. compression . 7. To plot the circle either use the calculated center C coordinate and the radius R or directly plot the stress coordinates for two mutually perpendicular planes and draw the circle through the two points A and B in Figure which must be diametrically opposite on the circle. Special Cases of Mohr s Circles for Plane Stress See Figures to FIGURE Uniaxial tension. FIGURE Uniaxial compression. Jx Oy Ơ-Ị Ơ point circle and similarly for biaxial compression with a point circle on the negative normal stress axis FIGURE Biaxial tension ơx oy and similarly for biaxial compression -ox -cy . FIGURE Pure .