CHAPTER ONE
STRESS
Learning objectives
1.
Understanding the concept of stress.
2.
Understanding the two-step analysis of relating stresses to external forces and moments.
_______________________________________________
On January 16th, 1943 a World War...
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CHAPTER ONE
STRESS
Learning objectives
1.
Understanding the concept of stress.
2.
Understanding the two-step analysis of relating stresses to external forces and moments.
_______________________________________________
On January 16th, 1943 a World War II tanker S.
S.
Schenectady, while tied to the pier on Swan Island in
Oregon, fractured just aft of the bridge and broke in two, as shown in Figure 1.
1.
The fracture started as a
small crack in a weld and propagated rapidly overcoming the strength of the material.
But what exactly is the
strength? How do we analyze it? To answer these questions, we introduce the concept of stress.
Defining this
variable is the first step toward developing formulas that can be used in strength analysis and the design of
structural members.
Failure of S.
S.
Schenectady.
Figure 1.
2 Two-step process of relating stresses to external forces and moments.
1.
1 STRESS ON A SURFACE
The stress on a surface is an internally distributed force system that
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