FEA Quiz Linear Analysis

#1. Material required to perform static structural linear analysis are

Young's Modulus, Poisson ratio, Density

Young's Modulus, Poisson ratio, Yield stress, Density

Stress Strain Curve, Poisson ratio, Density

Stress Strain Curve, Poisson ratio, Density, Thermal conductivity & Thermal expansion Coefficient

Youngs Modulus, Poisson ratio & Material Density are the material required to perform the linear analysis

#2. No Separation Contact allows;

No penetration, Surface are fixed to one another so no gaps and no sliding is allowed

No penetration, No gaps can open but sliding can takes place tangential to contacting surfaces

No penetration allowed, but surfaces are free to slide and separate without resistance.

Allows sliding with resistance proportional to user defined coefficient of friction, with freedom to separate without resistance.

No separation is bonded contacts in which, No penetration, No gaps can open but sliding can takes place tangential to contacting surfaces.

#3. In linear analysis, solution is solved with which of the following conditions:

Plasticity, creep, viscoelasticity, gasket material conditions are used

Frictional, frictionless, rough contacts are used

Compression only support is used.

Model stiffness does not change and bonded contacts are used

In linear analysis, model stiffness does not change, the stiffness is constant and bonded contacts are used between mating components.

#4. To solve the mirror condition of the valve, which of the following boundary conditions is used

Frictionless Support on valve cut boundary surfaces

Constrained in Normal direction on valve cut boundary surfaces

Fixed Support in on valve cut boundary surfaces

1 or 2

the mirror condition for the given valve is simulated by providing Frictionless Support or normal direction constrained on valve cut boundary surfaces.

#5. The square bar with 50 mm length is applied with 300C body temperature and 20C reference temperature & having structural steel as material; What is the deformation (increase in length) of the bar ?

0.17 mm

0.25 mm

50.17 mm

No Cange

The change is length due to thermal loads is calculated from equation (alpha (thermal expansion coefficient) * delta T (tmax-tref)* length) is o.17 mm.

#6. The basic FEA Equation to solve the linear static problem is F=K*D, in this equation how does K (stiffness) is considered in the analysis ?

Through Applied Boundary Conditions

Through Applied Material details (to geometry)

Through Mesh Elements (Meshing performed on analysis geometry)

All Above

In FEA, the stiffness is calculated from analysis geometry. The FEA mesh is created on geometry and respective elements are created on the geometry. Stiffness is elemental characteristic.

#7. The top face of the square beam is applied with a force of 35000 N in downward direction while the bottom face of the beam is applied with a force of 15000 N in upward direction as shown in figure, what is the value of the reaction force ?

50000 N

20000 N

15000 N

0 N

The top face of the beam is applied with 35000N while bottom face is applied with15000 N. Both the forces are acting in opposite direction and hence subtraction will happen between two forces, which gives 20000 N force value in reaction.

#8. Is it possible to apply moments on solid elements (which are having only translational DOF), if yes how to apply moments ?

Through constrained equation

Through creating shell coating on solid elements and then applying moment on shell elements

Creating remote point and then applying moment on remote point

All above

#9. Linear analysis is used when;

Material is nonlinear, bonded contacts are used, pressure loads are available

Material is linear, Bonded contacts are used, hydrostatic pressure loads are available

Material is linear, Bonded contacts are used, elastic supports are used

Bonded & Frictional contacts are used

Finish

Results

Congratulation !

You have good knowledge of linear static analysis !

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