Boltning tortishish tarangligi maydoni nima?

Tortishish tarangligi maydoni (As) — rezba qilingan biriktiruvchi elementning tortishish yuki sig'imini hisoblashda ishlatiladigan samarali ko'ndalang kesim maydoni. U nominal o'q maydonidan kichikroq, chunki rezba ildizining geometriyasini hisobga oladi. Bu ko'rsatkich ISO 898-1 da belgilangan va rezba ning o'rta diametr va kichik diametriga bog'liq.

Boltning tortishish mustahkamligi qanday hisoblanadi?

Bolt ultimate tensile load is calculated as Ft = Rm × As, where Rm is the ultimate tensile strength of the bolt material (determined by property class) and As is the tensile stress area. For example, a class 8.8 bolt has Rm = 800 MPa.

Bolt mulk sinfi 8.8 nimani anglatadi?

The first number (8) represents 1/100th of the minimum ultimate tensile strength in MPa (800 MPa). The second number (8) represents 10× the ratio of yield strength to ultimate tensile strength (0.8). So yield = 800 × 0.8 = 640 MPa.

Boltning kesish mustahkamligi qanday hisoblanadi?

ISO 898-1 does not specify shear strength — it covers tensile and proof-load properties only. A common simplified estimate takes shear strength as 60% of tensile strength: Fs = 0.6 × Rm × As, based on the von Mises yield criterion. Design codes such as Eurocode 3 (EN 1993-1-8) apply their own factors (0.6 or 0.5 depending on property class) plus partial safety factors. For single shear, use one stress area; for double shear, multiply by 2.

Tekshiruv yuki va tortishish mustahkamligi o'rtasidagi farq nima?

Tekshiruv yuki — boltning doimiy deformatsiyasiz bardosh bera oladigan maksimal kuchi (elastiklik chegarasi). Maksimal tortishish mustahkamligi — sinishdan oldingi maksimal kuch. Tekshiruv yuki tarangligi (Sp) ko'pgina mulk sinflari uchun oqish mustahkamligining taxminan 90% ini tashkil qiladi.

Muhandislik uchun bepul vosita

Bolt Tortishish & Kesish Mustahkamligi Kalkulyatori

Calculate the ultimate tensile load of metric bolts from ISO 898-1 property-class data, plus a simplified shear capacity estimate. Select bolt size and property class.

ISO 898-1 M3 – M64 Sinf 4.6 – 12.9

Bolt Size

Property Class

Shear Planes

Quick presets

Results

Maksimal tortish yuklamasi (Ft)

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Shear Capacity (Fs, simplified estimate)

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Tortish kuchlanishi maydoni (As)

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Oqish yuklamasi (Fy)

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Maksimal tortish mustahkamligi (Rm)

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Maksimal tortish yuklamasi

Vint sinishidan oldin bardosh bera oladigan maksimal tortish kuchi:

R_m — maksimal tortish mustahkamligi (MPa), mustahkamlik klassiga ko'ra
A_s — tortish kuchlanishi maydoni (mm²), ISO 898-1 / ISO 261 bo'yicha

Shear Capacity (Simplified Estimate)

ISO 898-1 defines the tensile and proof-load properties of bolts — it does not specify shear strength. The value shown here is a widely used simplified engineering estimate that takes shear strength as approximately 60% of tensile strength (based on the von Mises criterion, τ ≈ 0.58 σ):

Ikki tomonlama kesishda 2 ga ko'paytiring (ikki kesish tekisligi).

⚠️ Shear design note: Actual shear capacity depends on whether the shear plane passes through the threads or the unthreaded shank, on joint slip and plate bearing, and on fatigue loading. Design codes define their own values — e.g. Eurocode 3 (EN 1993-1-8) uses F_v = α_v × f_ub × A with α_v = 0.6 for classes 4.6, 5.6 and 8.8 but 0.5 for classes 4.8, 5.8, 6.8 and 10.9, together with partial safety factors. Always verify shear-loaded joints against the applicable structural or mechanical design code, not this simplified estimate alone.

ISO 898-1 bo'yicha mustahkamlik klasslari

Class	Rm (MPa)	Rp0.2 (MPa)	Typical Use
4.6	400	240	Past mustahkamlikli, umumiy maqsadli
5.8	520	420	Konstruktiv, oldindan kuchlantirilmagan
8.8	800	640	Avtomobil va mashinasozlik (eng keng tarqalgan)
10.9	1040	940	Yuqori mustahkamlikli konstruktiv
12.9	1220	1100	Maksimal mustahkamlik (legirlangan po'lat)

Amaliy Misol

Misol — M10 × 8.8 bolt

Given: M10 bolt, mustahkamlik sinfi 8.8, bir kesimli

A_s = 58.0 mm², R_m = 800 MPa

F_t = 800 × 58.0 = 46 400 N = 46,4 kN

F_s = 0.6 × 800 × 58.0 = 27 840 N = 27,8 kN

⚠️ Note: Bu qiymatlar xavfsizlik koeffitsientsiz yakuniy yuk ko'tarish qobiliyatidir. Hisoblash maqsadida tegishli xavfsizlik koeffitsientlarini qo'llang (odatda statik holat uchun 2–3, charchoq holati uchun 4–6).