Реферат: Механические свойства элементов Периодической системы Менделеева

Hardness, Vickers Max 5

Tensile Strength, Ultimate Max 15 MPa

Beryllium

Hardness, Rockwell B 75–85

Tensile Strength, Ultimate 370 MPa

Tensile Strength, Yield 240 MPa

Elongation at Break 3%

Modulus of Elasticity 303 GPa

Compressive Yield Strength 270 MPa Yield at 0,2% offset (10% higher than tensile yield strength)

Poisson's Ratio 0,07–0,18 values between 0,07 and 0,18 have been reported for beryllium

Charpy Impact 1,5–5,5 J (1,11–4,06 ft-lb) Notch status unknown

Fatigue Strength 160 MPa 10⁷ cycles; Kt=3,07 and R = 0,1

Fatigue Strength 240 MPa 10⁴ cycles; Kt=3,07 and R = 0,1

Fatigue Strength 240 MPa smooth; 10⁷ cycles (=yield strength)

Fracture Toughness 10,6–12,3 MPa-mЅ KIC for hot-pressed structural grades

Shear Modulus 135 GPa

Shear Strength 345 MPa hot-pressed block

Shear Strength 480 MPa cross-rolled sheet

Boron (Crystalline)

Knoop Microhardness 99,9% pure is 3300 (100 g load)

9,3 Mohs

Tensile Strength, Ultimate 2,6–3,1 MPa

Compressive Yield Strength Max 0,5 MPa B₂ O₃ inclusions

Boron (Amorphous)

Tensile Strength, Ultimate 1,6–2,4 MPa

Modulus of Elasticity 0,44 GPa in tension

Diamond (С)

Hardness, Knoop 8000

Knoop Microhardness 56–102 (001) face

Knoop Microhardness 58–88 (110),(111) faces

Knoop Microhardness 79 GPa

Vickers Microhardness 88–147 in GPa; (001) face

Vickers Microhardness 98 in GPa; (111) face

--> ЧИТАТЬ ПОЛНОСТЬЮ <--