Category: Calculators

Mohr three circles for the principal stresses sigma 1, sigma 2 and sigma 3 on a stress axis, with the largest circle shaded and its radius marked as the maximum shear stress, beside the von Mises formula.

Von Mises Stress Calculator (3D Stress State, Principal Stresses and Yield Check)

ProfessorNov 9, 2026

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Von Mises ellipse and Tresca hexagon failure envelopes with a plane stress point, a ray from the origin to the limit and the factor of safety as the ratio of the two distances.

Factor of Safety Calculator (Simple and Combined Stress, von Mises, Tresca)

ProfessorNov 7, 2026

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A bar pulled by force F stretching by elongation delta L, beside a stress-strain line whose slope is the modulus E and which ends at the yield stress.

Stress and Strain Calculator (Stress, Strain, Elongation and Shear)

ProfessorNov 6, 2026

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Two V-belt pulleys with diameters d and D joined by a belt, with the centre distance C marked and the belt length formula L = 2C + pi(D + d)/2 + (D - d)^2/4C.

V-Belt Length and Centre Distance Calculator (Pulleys, Wrap Angle and Tension)

ProfessorNov 4, 2026

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Two sprockets of 13 and 31 teeth joined by a roller chain with the centre distance C marked, and the pitch diameter formula D = p over sin(180 degrees over N).

Roller Chain Drive Calculator (Chain Length, Centre Distance and Sprockets)

ProfessorNov 3, 2026

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Hydraulic cylinder fed by a pump with flow Q to the cap side, a return line from the rod side and force F at the rod, with the formulas F = p times A and v = Q over A.

Hydraulic Cylinder Force and Speed Calculator

ProfessorNov 1, 2026

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Section of a double-acting pneumatic cylinder with air entering the cap end, pressure acting on the piston and force F at the rod end, with the formula F = p times A.

Pneumatic Cylinder Force and Air Consumption Calculator

ProfessorOct 31, 2026

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Stress Concentration Factor Calculator (Kt for Shoulders, Holes and Notches)

ProfessorOct 29, 2026

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Goodman diagram with alternating stress against mean stress, the safe region under the Goodman line from the endurance limit Se to the ultimate strength Sut, and an operating point, with the Goodman equation.

Goodman Fatigue Safety Factor Calculator (Goodman, Soderberg, Gerber and ASME)

ProfessorOct 28, 2026

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Cross-section of a bolted joint with a tightening torque T on the nut, the preload force F in the bolt and clamp force on the plates, with the formula T = K F d.

Bolt Torque Calculator (Preload, Nut Factor and Tightening Torque)

ProfessorOct 26, 2026

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