Advanced CAE Simulations (MAE546) Projects

1. ADVANCED CAE SIMULATIONS PROJECTS
Rate Dependent Creep and Viscoplasticity
Steel alloy with
modified time
hardening creep
Polyethylene Equivalent creep strain in clamp
Boundary conditions Equivalent creep strain increases with time
Equivalent stress decreases with time
(stress relaxation)
Creep limit ratio: 10
Bolt pretension: 10000 N
Creep monitored for 150 s
-- Aditya Vipradas
Arizona State University

2. Pre-stressed Modal Analysis
-- Aditya Vipradas
Arizona State University
Titanium alloy compressor
blade
Fixed support & pressure
boundary conditions
Equivalent von-Mises stress plot
(within yield limit)
Pre-stress mode 1 (356 Hz)
Mode 1 without pre-stress (355 Hz)
Modal analyses are performed on
a compressor blade by inducing a
pre-stress due to air pressure
loads and without inducing a pre-
stress.

3. Linear Eigenvalue and Nonlinear Buckling
Overhead aluminum shop crane
with boundary conditions
Linear buckling mode 1 (1 lbf load)
Nonlinear buckling mode without
stabilization (500 lbf load)
Nonlinear buckling characteristics
with stabilization (500 lbf load)
-- Aditya Vipradas
Arizona State University
Nonlinear stabilization parameters:
Method: Damping
Damping factor: 0.0001
Stabilization: Constant
Stabilization force limit: 0.2

4. Plasticity in Paperclip
-- Aditya Vipradas
Arizona State University
Plasticity parameters:
Material yield strength: 250 MPa
Multilinear isotropic hardening
implementation. The paper clip is
loaded with 1 N and then unloaded
resulting in residual deformation.
Steel paper clip with boundary
conditions
Total deformation after 1 N load
application (3.75 mm)
Residual deformation after
unloading (2.02 mm)
Equivalent plastic strain plot
Load against deformation plot

5. Bolted Connection
Bolted steel flanges with
polyethylene gasket
Total deformation plot Sliding distance between
bolt and flange
1/12 symmetry model
Frictionless supports on left, right and
bottom faces
Bolt pretension: 1500 lb
End cap load: 1048 lb
Internal pressure: 1000 psi
Bolt and flange friction coefficient: 0.25
-- Aditya Vipradas
Arizona State University
Load steps:
1. Bolt pretension
2. Lock bolt pretension
3. Apply end cap and pressure
load
Observations:
Bolt pretension decreases to 1473
lb as end cap load is applied

6. Aluminum Foil Twisting – Abaqus CAE (Explicit Dynamics)
0.08 mm thick aluminum
foil
Mandrel 1
Tie contact: Mandrel – Aluminum Foil
Self contact: Aluminum Foil
Mandrel mass: 1 kg
Coefficient of Friction: 0.2
Mandrel 2 is fixed; Mandrel 1 is translated
by 37 mm in Z-Direction and rotated by
3.14 rad about Z-axis
Simulation Time: 0.1 s
Mandrel 2
vonMises stress plot after 0.06 s vonMises stress plot after 0.1 s
Deformation magnitude plot after 0.1 s
Max. vonMises stress: 324 MPa
Max. deformation: 84 mm

7. Impact Analysis – Abaqus CAE (Explicit Dynamics)
Body 1 (solid)Body 2 (shell) Gap of 15 mm Deformation plot
vonMises stress plot
Body 2 is rigid; Body 1 is deformable steel
Surface to surface contact: Body1 – Body2
Coefficient of Friction: 0.2
Side face of Body 1 is fixed; Body 2 is free to
translate in Z-Direction
Velocity of Body 2: 100 m/s
Mass of Body 2: 100 gm
Simulation Time: 0.05 s
Element Deletion: Off
Max. vonMises stress:
147.7 MPa
Max. deformation:
7.13 mm