Burilish momenti ostida minimal val diametrini hisoblash formulasi qanday?

For a solid circular shaft: d = ∛(16T/(πτ_all)), where T is the applied torque and τ_all is the allowable shear stress. This comes from the torsion formula τ = Tc/J = 16T/(πd³) for a solid shaft.

Ruxsat etilgan kesuvchi kuchlanishni qanday tanlash kerak?

The allowable shear stress is typically 50-60% of the tensile yield strength: τ_all = 0.577 × σ_y (von Mises criterion). For steel AISI 1045: τ_all ≈ 180 MPa. Apply a safety factor of 1.5-3.0 depending on application criticality and loading type.

Içi bo'sh val qattiq val bilan qanday farqlanadi?

A hollow shaft with the same outer diameter has slightly less torsional strength but much less weight. The strength ratio is (1-k⁴) where k = d_i/d_o. For k = 0.5 (ID = half OD), you retain 93.75% of strength at about 75% of the weight.

Kalit pazonlari va kuchlanish kontsentratsiyasini hisobga olish kerakmi?

Ha. Kalit pazonlari turига qarab val mustahkamligini 25-50% kamaytiradi. Kuchlanish kontsentratsiyasi koeffitsientini Kt (kalit pazonlari uchun odatda 1.6-3.0) qo'llang. Samarali kuchlanish τ_eff = Kt × τ bo'ladi. Valni kontsentratsiyalangan kuchlanish bo'yicha o'lchamlang yoki ruxsat etilgan kuchlanishni mos ravishda kamaytiring.

Egilish va burilish momentining kombinatsiyasi haqida nima deyish mumkin?

When both bending moment M and torque T act, use the equivalent torque: T_eq = √(M² + T²) for maximum shear stress theory, or T_eq = √(M² + 0.75T²) for von Mises criterion. Then size the shaft using T_eq in place of T.

Bepul muhandislik vositasi №071

Buralish kalkulyatori uchun val diametri

Berilgan momentni uzatish uchun zarur bo'lgan minimal val diametrini hisoblang. Moment, ruxsat etilgan kesuvchi kuchlanish va materialni kiriting — xavfsizlik koeffitsienti bilan talab qilinadigan diametrni oling.

Vallar & rotorlarTo'liq & KovakAuto-Calc

Torque T (N·m)

Ruxsat etilgan kesuvchi kuchlanish τ_all (MPa)

Safety Factor

Shaft Type

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Minimal val diametri

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Haqiqiy kesuvchi kuchlanish

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Qo'llaniladigan xavfsizlik koeffitsienti

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Polar Moment J

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Buralish burchagi (1 m ga)

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Minimal diametr (to'liq val)

Hollow Shaft

Angle of Twist

Material	σ_y (MPa)	τ_all (MPa)	G (GPa)
AISI 1020 (yumshoq po'lat)	210	40	79
AISI 1045 (o'rtacha po'lat)	310	80	79
AISI 4140 (qotishma po'lat)	415	110	80
AISI 4340 (yuqori mustahkamlikli)	470	140	80

⚠️ Note: Ushbu kalkulyator faqat sof buralishga mo'ljallangan. Egilish va buralishning kombinatsiyasi uchun ekvivalent moment usulidan foydalaning. Kalit pazlari va kuchlanish kontsentratsiyasini har doim hisobga oling.

Torsiyon uchun val diametrini hisoblash | Bepul vosita

Published by Nikolai Shelkovenko on Fevral 15, 2026 Mart 5, 2026

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Minimal diametr (to'liq val)

Hollow Shaft

Angle of Twist

Do'kon

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