CAE Exam 1 Questions With Complete Solutions
[star] How do we define failure for a ductile material:
How do we define failure for a brittle material: Correct Answers
we define failure for a ductile material at the Yield point.
We define failure for a brittle material at fracture point
[star] Name 3 Different types of nonlinearities in finite elements
+ examples Correct Answers 1. Geometric [fishing pole effect;
weight on the fishing pole and the distance between our hand
and the weight gets shorter.]
2.Material [Entire stress-strain curve]
3.Contact (can be linear or nonlinear) [a hinge pin, free to rotate]
Buckling and stress-stiffening, definition and purpose Correct
Answers Stress-stiffening: Bending stiffness increases with
increasing axial tensile stress example: guitar string.
Buckling: phenomenon when bending stiffness reduces to zero,
i.e the structure is unstable.
Purpose of a buckling analysis is to find buckling loads and
buckling modes.
Define:
particle motion
Rigid body motion
Elastic Correct Answers • Particle- Motion of a single particle
• Rigid Body - Motion of body or system of bodies that are rigid
and unable to deform.
, • Elastic - System represented by 1 or more bodies that are
elastic. May be a mix of elastic and rigid body modes.
Describe the Part Modeling Process Correct Answers 1.Create a
sketch
2.add dimensions
3.Extrude as desired
4.add other needed features
Dynamic Response Correct Answers Natural Frequencies
Harmonic Response
Transient Response
Random Response
Engineering simulation Correct Answers Finding the responses
of a problem domain subject to environmental conditions
Failure of a 'Brittle Material' Correct Answers Failure = Tensile
Failure• (Tensile stress [𝜎1] ≥ Fracture Strength
• Max Principal Failure criterion
• 'Min Principal Failure' may exist for materials under
compressive loading (glass)
failure of a 'Ductile Material' Correct Answers Tresca failure
Failure = Shear Dominated Failure• (Max Shear stress [𝜏] ≥
Shear Strength• Max Shear (Tresca) Failure criterion
Failure of a 'Ductile Material' Correct Answers Von mises
FEM Process Correct Answers 1.Preprocessor (Build the
Model)
[star] How do we define failure for a ductile material:
How do we define failure for a brittle material: Correct Answers
we define failure for a ductile material at the Yield point.
We define failure for a brittle material at fracture point
[star] Name 3 Different types of nonlinearities in finite elements
+ examples Correct Answers 1. Geometric [fishing pole effect;
weight on the fishing pole and the distance between our hand
and the weight gets shorter.]
2.Material [Entire stress-strain curve]
3.Contact (can be linear or nonlinear) [a hinge pin, free to rotate]
Buckling and stress-stiffening, definition and purpose Correct
Answers Stress-stiffening: Bending stiffness increases with
increasing axial tensile stress example: guitar string.
Buckling: phenomenon when bending stiffness reduces to zero,
i.e the structure is unstable.
Purpose of a buckling analysis is to find buckling loads and
buckling modes.
Define:
particle motion
Rigid body motion
Elastic Correct Answers • Particle- Motion of a single particle
• Rigid Body - Motion of body or system of bodies that are rigid
and unable to deform.
, • Elastic - System represented by 1 or more bodies that are
elastic. May be a mix of elastic and rigid body modes.
Describe the Part Modeling Process Correct Answers 1.Create a
sketch
2.add dimensions
3.Extrude as desired
4.add other needed features
Dynamic Response Correct Answers Natural Frequencies
Harmonic Response
Transient Response
Random Response
Engineering simulation Correct Answers Finding the responses
of a problem domain subject to environmental conditions
Failure of a 'Brittle Material' Correct Answers Failure = Tensile
Failure• (Tensile stress [𝜎1] ≥ Fracture Strength
• Max Principal Failure criterion
• 'Min Principal Failure' may exist for materials under
compressive loading (glass)
failure of a 'Ductile Material' Correct Answers Tresca failure
Failure = Shear Dominated Failure• (Max Shear stress [𝜏] ≥
Shear Strength• Max Shear (Tresca) Failure criterion
Failure of a 'Ductile Material' Correct Answers Von mises
FEM Process Correct Answers 1.Preprocessor (Build the
Model)
