== Elastic analysis of an Airfoil with uniform cross-section == In this example, we want to compute the elastic effective properties of an Airfoil with uniform cross-section, fabricated from plain weave laminate made of isotropic elastic matrix and transversely isotropic elastic fiber. The MSG solid model is used to predict the effective elastic properties of a plain weave composite using a three part approach. The first part predicts the effective elastic yarn properties based on the elastic fiber and matrix properties at the microscale. The second part takes the effective yarn properties and matrix properties to predict the elastic properties of weave composites. The third part uses the effective weave properties in the structural analysis to predict the elastic properties of the Airfoil . [[BR]] [[BR]] [[Image(T0.1.jpg, desc="Yarn")]] [[Image(T0.2.jpg, desc="Weave")]] [[BR]] [[Image(A0.1.png, desc="Airfoil model taken from H. Chen, W. Yu and M. Capellaro ")]] [[Image(A0.2.png, desc="Airfoil baselines taken from UIUC Airfoil Coordinate Database mh104 model'')]] [[BR]] The fiber properties are defined as transversely isotropic elastic by means of engineering constants and the matrix properties are given by means of the elastic modulus with a constant Poisson's ratio equal to 0.33 as specified in the table below. [[BR]] [[BR]] [[Image(0.1.png, desc="Material Properties")]] [[BR]] [[BR]] [[BR]] We will use a square pack 2D SG with fiber volume fraction equal to vf = 0.64. == Software Used == We will use !TexGen4SC 2.0, !SwiftComp 2.1 and Abaqus CAE with the Abaqus !SwiftComp GUI for this tutorial. !TexGen4SC 2.0 will be used to run the elastic homogenization of the fiber-matrix square pack microstructure and also for the elastic homogenization of the plain weave laminate. Abaqus CAE will be used to model the tube and to run the homogenization while !SwiftComp runs in the background. ---- == Solution Procedure == The problem is divided into the following five sections: [[BR]] Section 1- 2D Micro-scale analysis of the square-pack fiber matrix micro structure using Texgen4SC. [[BR]] Section 2- 3D Meso-scale analysis of the plain weave laminate using Texgen4SC2.0. [[BR]] Section 3- 3D Macro-scale analysis of the Airfoil using Abaqus CAE with the Abaqus !SwiftComp GUI and !SwiftComp 2.1. [[BR]] Section 4- 1D beam structural analysis using Abaqus. [[BR]] Section 5- 2D De-homogenization of the Airfoil cross-section using Abaqus CAE with the Abaqus !SwiftComp GUI and !SwiftComp 2.1. ---- == Solution Procedure == ====Section1- Micro-scale analysis of the square-pack fiber matrix micro structure using Texgen4SC.==== ''' # Step 1.1.''' Create the plain weave pattern using !TexGen4SC 2.0. Launch !TexGen4SC 2.0 on cdmHUB, the Go to window-> controls-> “Weave” to create mesoscale plain weave SG. [[BR]] [[Image(T1.1.png, desc="Weave Wizard")]] [[BR]] ''' # Step 1.2.''' Keeping the geometric properties as required, Click on the upper-right and lower-left squares to get the woven pattern. [[BR]] [[Image(T1.3.png, desc="Weave Pattern")]] [[BR]] ''' # Step 1.3.'''Click “Microscale” under “Homogenization” tab for yarn property calculation. Select “elastic” as the type of analysis and Enter the material properties for the fiber and matrix and set fiber Volume fraction as 0.64 and Click “Finish”. [[BR]] [[Image(A1.3.png, desc="Adding Material properties")]] [[BR]] ''' # Step 1.4.''' Now a .sc file (micro.sc) will be generated that !SwiftComp will take as the input. !SwiftComp will run on the cloud to calculate elastic properties of yarns, e.g., effective microscale properties. In the pop-up window, you will find the analysis results. [[BR]] [[Image(A1.4.png, desc="Micro scaleResuts")]] [[BR]] ==== Section 2- Meso-scale analysis of the plain weave laminate using Texgen4SC. ==== [[BR]] ''' # Step 2.1.''' Go to “File->Export->!SwiftComp File” to generate the .sc file for mesoscale analysis. [[BR]] [[Image(T2.1.png, desc="weave mesh")]] [[BR]] ''' # Step 2.2.''' Define the voxel mesh, Select “elastic” as Type of analysis and Select “Plate/Shell model” and “Kirchhoff-Love plate”. [[Image(A2.2.png, desc="SwiftComp Wizard")]] [[BR]] ''' # Step 2.3.''' Save the .sc (!SwiftComp input file) file with a filename of your choice. Click “Mesoscale” in “Homogenization” tab, which will call !SwiftComp to calculate fabric properties. [[BR]] [[Image(A2.4.png, desc="Meso Scale Results")]] [[BR]] ''' # Step 2.4.'''Transfer this file to your local computer for further analysis. [[BR]] ====Section 3- Macro-scale analysis of the Airfoil using Abaqus CAE with the Abaqus !SwiftComp GUI and !SwiftComp 2.1. ==== [[BR]] ''' # Step 3.1.''' Set sketch plane for customized SG -> Create planar shell -> Select the plane and vertical axis -> Sketch the cross section shown from the baseline coordinates. [[BR]] [[Image(A3.1.png, desc="Airfoil shell")]] [[BR]] [[BR]] [[Image(A3.12.png, desc="Baseline coordinates")]] [[BR]] ''' # Step 3.2.''' Partition the part as shown to obtain the final cross-section [[BR]] [[Image(A3.21.png, desc="Airfoil shell partition dimensions")]] [[BR]] [[BR]] [[Image(A3.22.png, desc="Airfoil shell partition")]] [[BR]] [[BR]] [[Image(A3.23.png, desc="Airfoil Crosssection")]] [[BR]] ''' # Step 3.2.''' Enter the material properties for the model. First we need to choose the material properties from the results of the computed effectiveelastic properties in the previous part. Within the Materials section of Abaqus CAE, we create a material called “Material” and add the corresponding properties. [[BR]] [[BR]] [[Image(A3.3.png, desc="Material properties ")]] [[BR]] ''' # Step 3.4.''' Now go to New Layups and add the material, section name, Layup and thickness to create the required layup. This can be repeated if we have multiple layups. We will use (0/45/-45/0)5 with a individual ply thickness of 1mm as the laminate for the tube. [[BR]] [[Image(A3.4.png, desc="Layups")]] [[BR]] ''' # Step 3.5.'' To assign the layup, go to Create 2D SG: Assign Layups and the pick the baseline, the line opposite to the baseline and the area between the two picked line for the right flange as shown and then hit Ok. Do this for all sections [[BR]] [[Image(A3.51.png, desc="Assign Layups")]] [[Image(A3.52.png, desc="Assign Layups")]] [[BR]] ''' # Step 3.6.'' Now go to Assemble, create the part instance with dependent mesh. [[BR]] [[Image(A3.6.png, desc="assembly")]] [[BR]] ''' # Step 3.7.'''In the Mesh section, Seed the Part and set approximate global mesh size, then Click ‘Mesh Part’ [[BR]] [[Image(A3.7.png, desc="Mesh")]] [[BR]] ''' # Step 3.8.'''Create a job and write its input file. [[BR]] [[Image(A3.8.png, desc="ip file")]] [[BR]] ''' # Step 3.9.'''To the effective elastic properties. we click on Homogenization and select elastic in Analysis Type. Homogenize the part preferably as a beam using the Homogenization via input file option to get the final results. [[BR]] [[Image(A3.9.png, desc="Homogenization")]] [[BR]] ====Section 4- 1D beam structural analysis using Abaqus. ==== [[BR]] ''' # Step 4.1.''' Go to create part -> Create a wire frame of length 10,000 mm. [[Image(4.1.png, desc="Part dimensions")]] [[BR]] '' # Step 4.2.''' Enter the material properties for the model. First we need to choose the material properties from the homogenized results from section 3. Within the Materials section of Abaqus CAE, we create a anisotropic elastic material called “Airfoil_prop” and add the corresponding properties. Create and assign corresponding section for the wire part. [[BR]] [[BR]] [[Image(4.1.png, desc="Material properties ")] ===References=== # Liu, X.; Tang, T.; Yu, W., Pipes, R. B.: “Multiscale modeling of viscoelastic behavior of textile composites,” International Journal of Engineering Science, Vol 130, September 2018, pp. 175-186, DOI: 10.1016/j.ijengsci.2018.06.003. # Rique, O.; Liu, X.; Yu, W., Pipes, R. B.: “Constitutive modeling for time- and temperature-dependent behavior of composites,” Composites Part B: Engineering, Vol 184, March 2020, DOI: 10.1016/j.compositesb.2019.107726.