External pressure charts require determination of which factors?

External pressure charts require determination of which factors?

• A. Factor A and B
• B. Temperature and pressure
• C. Material grade and thickness
• D. Factor X and Y

Answer: (A)

External pressure charts are used to assess buckling under external loading by reducing the problem to two key inputs that capture how the shell is shaped and how it is supported. To use the charts, you determine two dimensionless factors: one that represents the geometry of the shell (such as a slenderness measure like radius-to-thickness) and another that represents the boundary conditions or end restraints (how the ends are supported or fixed, which affects stability). With these two factors, you can read off the chart to find the critical external pressure or allowable pressure for that configuration. The other ideas don’t fit because temperature and pressure describe the operating environment, not the two inputs the charts rely on; material grade and thickness are material properties, not the two abstract factors that summarize geometry and end conditions; and a vague pair of factors (like two arbitrary letters) isn’t specific enough—the charts require two defined inputs that capture the geometry and boundary conditions.

External pressure charts are used to assess buckling under external loading by reducing the problem to two key inputs that capture how the shell is shaped and how it is supported. To use the charts, you determine two dimensionless factors: one that represents the geometry of the shell (such as a slenderness measure like radius-to-thickness) and another that represents the boundary conditions or end restraints (how the ends are supported or fixed, which affects stability). With these two factors, you can read off the chart to find the critical external pressure or allowable pressure for that configuration.

The other ideas don’t fit because temperature and pressure describe the operating environment, not the two inputs the charts rely on; material grade and thickness are material properties, not the two abstract factors that summarize geometry and end conditions; and a vague pair of factors (like two arbitrary letters) isn’t specific enough—the charts require two defined inputs that capture the geometry and boundary conditions.