Surface models can only be meshed with shell elements: $(2$pts$)$

a$.$ True

b$.$ False

Which is NOT a benefit for transforming a stress element to its principal stresses: $(4$pts$)$

a$.$ It simplifies the analysis so that shear stresses on the principal planes is zero.

b$.$ It allows for safety analysis since principal stresses are used in comparing to material strength properties.

c$.$ It avoids material creep when a material is subjected to an external load for a period of time.

d$.$ It helps optimize the design to ensure materials are used effectively to minimize weight, minimize cost, and ensures safety and performance.

Yield stress is used to calculate von Mises stress: $(2$pts$)$

a$.$ True

b$.$ False

When an In$-$Plane stress element is transformed, the element is analyzed in a different coordinate system: $(2$pts$)$

a$.$ True

b$.$ False

In FEA, a complex structure can be represented by a network of springs in order to help with the analysis of displacement, strain, and stress: $(2$pts$)$

a$.$ True

b$.$ False

The following sheet metal structure displayed below is best analyzed in FEA using: $(4$pts$)$

a$.$ Solid elements

b$.$ Shell elements

c$.$ Beam elements

d$.$ A combination of beam and solid elements