Rheinmetall Automotive Interview Questions and Answers

The number of zero natural frequencies in free-free modal analysis of hex elements.

• Free-free modal analysis

• Hex elements

• Zero natural frequencies

Materials properties required for thermal analysis

• Thermal conductivity

• Specific heat capacity

• Thermal expansion coefficient

• Melting point

• Boiling point

• Heat transfer coefficient

• Thermal diffusivity

Non-linearity convergence issue can be resolved by adjusting the solver settings and/or modifying the model.

• Check the initial conditions and boundary conditions

• Try using a different solver or adjusting the solver settings

• Modify the model to reduce non-linearity

• Check for any errors in the input data or model setup

• Increase the number of iterations or decrease the convergence tolerance

• Consider using sub-stepping or adaptive time-stepping

• Perform a sensitivity analysis to identify...read more

Ansys APDL has various types of elements including structural, thermal, fluid, electromagnetic, and acoustic elements.

• Structural elements include beam, shell, and solid elements

• Thermal elements include conduction, convection, and radiation elements

• Fluid elements include 1D, 2D, and 3D elements for incompressible and compressible flows

• Electromagnetic elements include magnetic, electric, and coupled field elements

• Acoustic elements include 2D and 3D elements for sound pressure a...read more

Quality checks for mesh include element size, aspect ratio, skewness, orthogonality, and boundary conformity.

• Element size should be appropriate for the geometry and physics of the problem.

• Aspect ratio should be within acceptable limits to avoid distorted elements.

• Skewness should be minimized to avoid numerical errors.

• Orthogonality should be maintained to ensure accurate results.

• Boundary conformity should be checked to ensure proper connection with adjacent meshes.

• Examples: Ja...read more

Low cycle fatigue occurs at high stress levels and a small number of cycles, while high cycle fatigue occurs at low stress levels and a large number of cycles.

• Low cycle fatigue is caused by plastic deformation and occurs at stress levels above the yield strength of the material.

• High cycle fatigue is caused by cyclic loading and occurs at stress levels below the yield strength of the material.

• Low cycle fatigue is typically seen in aerospace and automotive applications, while h...read more

Solid elements have 3 degrees of freedom (DOF) because they can only deform in 3 directions.

• Solid elements are used to model objects that are not easily deformed in all directions

• The 3 DOF are translations in x, y, and z directions

• Examples include beams, columns, and plates