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2 50

1 (50 ) 50 kN

5,000 mm

50 kN

5 Moment M

max= 62.5 kN*m

Section modulus Z = 1250 cm3

Z

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8.8 384 MPa 50 kN 28.8 M30 8.8 2 (50 )1. strength

strength strength

Su = 0.45 HB ksi Su = 3.10 HB MPa

2.

1.

2.

3.

4.

5. 6. 7.

8. x rays, ultraviolet rays

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3. quenching tempering endurance strength endurance strength

1. Flame hardening

2. Induction hardening

3. Carburizing strength 4. Nitriding carburizing strength

4. (static load)

(theory of failure) 5 5

1. Maximum Principal Stress Theory (Rankines Theory)

2. Maximum Shear Stress Theory (Guests Theory)

3. Maximum Principal Strain Theory (St. Venants Theory)

4. Maximum Strain Energy Theory (Haighs Theory)

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5. Maximum Distortion Energy Theory (Haighs Theory)

5.

1.

2.