Dynamic Analysis using blast loading on an I-Beam using Finite Element methods in Abaqus

Dynamic Analysis using blast loading on an I-
Beam using Finite Element methods in Abaqus
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Assignment Report
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TABLE OF CONTENTS
TABLE OF CONTENTS..................................................................................................................i
TASK 1: Setting up non-linear FE Model.......................................................................................1
TASK 2: Results Of non-linear analysis and Comparison with Biggs-data..................................11
TASK 3: Results Of non-linear analysis with both ends pinned...................................................15
TASK 4: Using Strain rate dependence in Non-linear material.....................................................18
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TASK 1: Setting up non-linear FE Model
In Task 1, a non-linear dynamic FE model is to be prepared for blast wall stiffener beam with
several given inputs. The modelling steps for the model are described below. In figure 1,
Modeled geometry of beam along with I-beam cross-section is shown. This is modelled in
Abaqus as shown in figure 2. The length of the beam is 5150 mm as given in inputs.
Regarding material properties, 2 different types of material models are to be used. First is, linear-
perfectly plastic for which only yield strength of material is to be defined, it is shown in figure 3.
Second is, linear-nonlinear for which non-linear relationship between stress and strain post yield
point is necessary, it is shown in figure 4. The provided engineering stress-strain data is
converted into true stress-strain data using Abaqus material calibration as shown in figure 5.
Figure 1: Dimensions of beam and I Cross-section to be modelled
1

Figure 2: I-Beam Cross-section Dimensions as used in Abaqus modelling
Figure 3: Elastic-Perfectly plastic material model as defined for 1st type of material behaviour
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Figure 4: Elastic-Nonlinear material model as defined for 2nd type of material behaviour using
true stress-strain curve
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Figure 5: Conversion of engineering stress-strain to True stress-strain using Abaqus Material
Calibration tool
Figure 6: Beam Material section to be assigned to I-Beam
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