Which change increases shell buckling resistance?

Which change increases shell buckling resistance?

• A. Increased thickness
• B. Higher operating temperature
• C. Lower yield strength
• D. Larger diameter

Answer: (A)

The key idea is that a shell’s resistance to buckling is dominated by its stiffness and how slender the shell is. Making the shell thicker increases its bending and overall structural stiffness, which raises the critical load at which buckling occurs. For thin-walled shells, the critical buckling load is highly sensitive to the thickness-to-radius ratio, so even a modest increase in thickness substantially boosts buckling resistance. Higher operating temperature tends to reduce material stiffness and strength, which can actually lower buckling resistance rather than raise it. Lower yield strength can promote plastic buckling and weaken the shell's ability to resist instability. A larger diameter makes the shell more slender for the same thickness, decreasing the critical buckling load and thus reducing resistance. Therefore, increasing thickness best improves buckling resistance.

The key idea is that a shell’s resistance to buckling is dominated by its stiffness and how slender the shell is. Making the shell thicker increases its bending and overall structural stiffness, which raises the critical load at which buckling occurs. For thin-walled shells, the critical buckling load is highly sensitive to the thickness-to-radius ratio, so even a modest increase in thickness substantially boosts buckling resistance.

Higher operating temperature tends to reduce material stiffness and strength, which can actually lower buckling resistance rather than raise it. Lower yield strength can promote plastic buckling and weaken the shell's ability to resist instability. A larger diameter makes the shell more slender for the same thickness, decreasing the critical buckling load and thus reducing resistance. Therefore, increasing thickness best improves buckling resistance.