Material Science_ Vol 2 of 2 - US DOE (1993) Episode 2 ppsx

Department of EnergyFundamentals Handbook MATERIAL SCIENCE Module 3 Thermal Shock... Thermal Shock DOE-HDBK-1017/2-93 TABLE OF CONTENTSTABLE OF CONTENTS LIST OF FIGURES.. DOE-HDBK-1017/2

Department of Energy

Fundamentals Handbook

MATERIAL SCIENCE

Module 3

Thermal Shock

Thermal Shock DOE-HDBK-1017/2-93 TABLE OF CONTENTS

TABLE OF CONTENTS

LIST OF FIGURES ii

LIST OF TABLES iii

REFERENCES iv

OBJECTIVES v

THERMAL STRESS 1

Thermal Shock 1

Summary 5

PRESSURIZED THERMAL SHOCK 6

Definition 6

Evaluating Effects of PTS 6

Locations of Primary Concern 8

Summary 8

DOE-HDBK-1017/2-93 Thermal Shock

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THERMAL STRESS DOE-HDBK-1017/2-93 Thermal Shock

If the material is not constrained, it expands, and one or more of its dimensions increases The thermal expansion coefficient (α) relates the fractional change in length ∆ l, called thermal

l

strain, to the change in temperature per degree ∆T

∆ l l

∆ T

∆ l

l

where:

l = length (in.)

∆l = change in length (in.)

α = linear thermal expansion coefficient (°F-1)

∆T = change in temperature (°F) Table 1 lists the coefficients of linear thermal expansion for several commonly-encountered materials

TAB LE 1 Coefficients of Linear Therm al Expansion

Material Coefficients of Linear Thermal Expansion (°F-1)