6 Modeling and Simulation
6.1 ABAQUS/CAE 6.1 ABAQUS/CAE
The ABAQUS software [15] suite has an unsurpassed reputation for The ABAQUS software [15] suite has an unsurpassed reputation for technology, quality, and reliability and provides a powerful and complete technology, quality, and reliability and provides a powerful and complete solution for both routine and sophisticated linear and nonlinear engineering solution for both routine and sophisticated linear and nonlinear engineering problems.
problems. ABAQUS ABAQUS delivers delivers a a unified unified FEA FEA environmeenvironment nt that that is is aa compelling alternative to implementations involving multiple products and compelling alternative to implementations involving multiple products and vendors.
vendors.
With ABAQUS/CAE we can quickly and efficiently create, edit, monitor, With ABAQUS/CAE we can quickly and efficiently create, edit, monitor, diagnose, and visualize advanced ABAQUS analyses. ABAQUS/CAE diagnose, and visualize advanced ABAQUS analyses. ABAQUS/CAE integrates modeling, analysis, job management, and results visualization in integrates modeling, analysis, job management, and results visualization in a consistent, easy-to-use environment that is simple to learn for new users a consistent, easy-to-use environment that is simple to learn for new users yet highly productive for experienced users. Familiar concepts such as yet highly productive for experienced users. Familiar concepts such as feature-based, parametric modeling make ABAQUS/CAE a modern and feature-based, parametric modeling make ABAQUS/CAE a modern and effective pre- and
effective pre- and postprocessor for engineering specialists.postprocessor for engineering specialists.
The finite element analysis of the creep model has been done in ABAQUS.
The finite element analysis of the creep model has been done in ABAQUS.
The assumptions made in our modeling are as follows The assumptions made in our modeling are as follows 1. The material is assumed to be isotropic.
1. The material is assumed to be isotropic.
2. The material i
2. The material is assumed to be s assumed to be homogeneohomogeneous.us.
The step by step procedure of the analysis of the creep model in ABAQUS The step by step procedure of the analysis of the creep model in ABAQUS is shown in the Appendix A. It includes creation of part, assigning of is shown in the Appendix A. It includes creation of part, assigning of various material properties, creation of the section and the assembly, steps, various material properties, creation of the section and the assembly, steps, applying of loads and boundary conditions, meshing of the model. Finally, applying of loads and boundary conditions, meshing of the model. Finally, creation of job and submitting the job for the analysis.
creation of job and submitting the job for the analysis.
After submitting the job for analysis the ABAQUS software performs the After submitting the job for analysis the ABAQUS software performs the creep analysis of the material model. The results can be interpreted as creep analysis of the material model. The results can be interpreted as shown below.
shown below.
The creep formation in the material can be seen for different step times in The creep formation in the material can be seen for different step times in the following figures,
the following figures,
FOR STEP TIME = 125 SECONDS FOR STEP TIME = 125 SECONDS
Figure39: Starting stage of Creep of PPC2.25 under 24Mpa.
Figure39: Starting stage of Creep of PPC2.25 under 24Mpa.
From the figure39 the propagation of the creep at
From the figure39 the propagation of the creep at step time 125seconds canstep time 125seconds can be observed
be observed. Since the object is cons. Since the object is constrained at one end the vtrained at one end the values of thealues of the creep strain vary according to the
creep strain vary according to the coloured regions.coloured regions.
FOR STEP TIME = 960 SECONDS FOR STEP TIME = 960 SECONDS
Figure40: CE 22 for PPC2.25 under 24Mpa at certain step time.
Figure40: CE 22 for PPC2.25 under 24Mpa at certain step time.
From the fig.40 the propagation of creep at step time 960 seconds can be From the fig.40 the propagation of creep at step time 960 seconds can be observed. The center region has the maximum creep strain and the region observed. The center region has the maximum creep strain and the region tends to expand with the increase in step time.
tends to expand with the increase in step time.
FOR STEP TIME = 2500 SECONDS FOR STEP TIME = 2500 SECONDS
Figure41: Creep formation at certain step time Figure41: Creep formation at certain step time
From the Fig.39 to 41 the propagation of creep for step time 2500 seconds From the Fig.39 to 41 the propagation of creep for step time 2500 seconds can be observed. From the Fig.39 we can notice the creep phenomena with can be observed. From the Fig.39 we can notice the creep phenomena with the dark region formed in the center. Also from the Fig.39 to 41 we can the dark region formed in the center. Also from the Fig.39 to 41 we can conclude that the increase in step time results in the increase in the creep conclude that the increase in step time results in the increase in the creep strain up to a certain time period.
strain up to a certain time period.