Table 2-1. CLASSIFICATION OF TRESSES FOR SOME TYPICAL CASES-continued

Table 2-1. CLASSIFICATION OF TRESSES FOR SOME TYPICAL CASES-continued - 4_159_010063

The amplitude of alternating stress intensity

4_159_01
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TABLE 2-1

CLASSIFICATION OF STRESSES FOR SOME TYPICAL CASES (CONTINUED)

Vessel

Location

Origin of

Type of Stress

Classification

Component

Stress

Nozzle

Cross section Internal

General membrane

perpendicular pressure

(av. across full sec-

to nozzle axis or external

tion.)

load

Stress component

See 4-138

perpendicular to

section

External load Bending across

or moment

nozzle section

See 4-138

Nozzle wall

Internal

General membrane

PmSee 4-138

pressure

Local membrane

Bending

Peak

Differential

Membrane

expansion

Bending

Peak

Cladding

Any

Differential

Membrane

expansion

Bending

Any

Radial

Equivalent linear

temperature

stress [3]

distribution[2]Nonlinear portion of

stress distribution

Any

Stress concentration

(notch effect)

NOTES:

[1] Consideration must also be given to the possibility of wrinkling and

excessive deformation in vessels with large diameter-to-thickness ratio.

[2] Consider possibility of thermal stress ratchet.

[3] Equivalent linear stress is defined as the linear stress distribution

which has the same net bending moment as the actual stress distribution.

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