Masterof Engineering

(Mechanical)

Please complete your answers on the assessment cover page document available on Moodle.

Clearly label your question numbers (there is no need to copy the full  questionover). Includeal working out.

Introduction:

You are to use the ANSYS MECHANICAL software program to answer all the questions in this assessment.This software is available on EIT’s Remote Labs.All students completing thi sunit have been provided with access to this software.

While completing this assessment, you are required to provide screenshots and brief detail of the steps at various stages of the ANSYS MECHANICAL model to demonstrate your proficiency with using the software and the attainment of the required level of knowledge for this assessment.

You are also required to submit your ANSYS MECHANICALmodel files produced from thes imulations as a part of this assessment.

Task1:                                                                                                                        (90marks)

Problem statement:

In this practical assessment,you have to develop ageometry,generatemesh anda modelofaplate with an edge crack of the following dimensions and static fracture analysis of the edge cracked plate with pre-meshed crack and smart crack growth fracture tools using Ansys workbench.

1. Geometry dimension: The dimensions of the plate are Length = 20 cm, Width=10 cm, thickness=0.5cm,the total cracklength=2cm,distance fromcrac ktiptooneside oft he crack face =0.1 cm, distance between the two sides of the crack faces is 0.2 cm.

2. Generate Mesh

   Body mesh: Apply Method- Choose Tetrahedron. Crack tipmesh:Choosesizing-Sphereofin fluence

3. Boundary Conditions:one face parallel tothecrac kis“Fixedsupport”

Opposite face:Apply“Pressure”or “Deformation”

Post Processing Results

1. Show the equivalentstress (Von misesstress)
2. Show the total deformation
3. Show the mode1 Stress Intensity Factor SIFS(KI)

Requirements:

1. Generate the “Geometry” of the cracked plate and show the screen shot of each step and give a brief explanation of each step.                                                                                            (15marks)

Set up the“Model”ofthe cracke dplate and complete the following:

1. Show the screensh ot sand write a brief description of mesh generation                     (15marks)
   1. Select the “pre-meshed crack” and “smart crack growth” fracture tools and show the screen shots of every step.Also writea brief description of the steps.                         (15marks)
   2. Show the screen shots of al the boundary conditions.                                              (10 marks)
   3. Post Processing oft here sults
      • Provide the screenshots and explain the solution of the stress intensity factor SIFS (KI) at the tip of the crack.                                                                                                    (5marks)
      • Provide the screen shots and explain the equivalent stress contours at the tip of the crack.    (5marks)
      • Provide the screen shots and explain the total deformation concour satth etipofthe crack.        (5 marks)

Upload all the executable files to your EIT One Driveaccount and provide the link.

(10 marks)

Analyse the fracture of the plate based on the results of the simulation. Compare the SIFS value with the material fracture toughness and comment on the crack growth.                             (10marks)

PDF and Edge Cracked Plate Model Submission Process

• There is no word limit for the report.However, your answers houldbes pecific. Seethe marks distribution and put emphasis accordingly.
• The submitte dreportmustc ontain all the requirements above.
• The PDF report must be uploaded to the Moodle.
• You must submit all the executable files in your One Drive. Instructions here: https://support.microsoft.com/en-us/office/share-onedrive-files-and-folders-9fcc2f7d-de0c-4cec-93b0-a82024800c07
• Provide the link and access tot he files on One Drive in your submitted PDF file.

Detail steps of using Ansys Mechanical

1. Open Ansys Mechanical workbench.Click to “Static Structural”
2. Choose the default material which“Structural Steel”
3. Develop the geometry-click onX-Yplane,change the unit tocm.
4. Sketch are ctanglean dinser the above dimensions.
5. Create acrack of the above dimensions- trimthe left side.
6. Choose Extrude-Select selection vector-Choose“Bothsymmetry”
7. Insert excludede pth0.25cmto createa 0.5cmthick plate.
8. Click on the cracktop-rightclickand select name selection.
9. Name the selection Crack_Top and click “Generate”
10. Click on the crack bottom in the geometry,rightc lick and select name selection.
11. Name the selection Crack_Bottom andclick “Generate”
12. Selecte dge and click onthe crack tipedge,rightclick-name selection and selectthename to

Crack_Tipand“Generate”.

1. Close the window.Click on the“Model”to develop the model.
2. Develop“Mesh”
3. Click‘yes’on“Capturecurvature”
4. Mesh—sizing—Click on the crackti pedgeand“Apply”
5. Choose“Sphere of influence”fortheType.
6. Choose“Sphere Center”as the localcoordinate system.
7. To choose the coordinate system,click on the insert“Coordinate system”

Choose“Spheresize”and“Element size”.

1. Click on the“CrackTip”edgeand Apply.
2. Click on the“Edge Sizing”and choose1 0mm for spheresize,elementsize2mm.
3. For Bodymesh,Right click on Mesh---choose Method-Click on the Body and choose

“Tetrahedrons”.

1. Click“Generate Mesh”.
2. Click on the symmetryregion---choose the frontt wofaces and Apply symmetry.
3. Goto Fracture---choose“Pre-meshedCrack”
4. For“Premeshed Crack ”weneed to convert all the names elections to“Create Nodal Name Selection” and give them different names such as crack tip-CF, Crack top-CT and Crack Bottom-CB
5. Go to details of “Pre-meshedCrack”.Choose Crack Front CF,Crack Facesnodes-On,Top Face Nodes-CT, Bottom Face nodes- CB
6. Click on the coordinate system and choose“selectionc on tours”8
7. Choose“Fracturetool”“smart crack growth”.
8. Choose initial Crack“Pre-meshedCrack”andCrack Growth optionto“Static”
9. Choose Failure Criteria Option:Stress Intensity Factor
10. Choose“ Critical Rate ”and use the stress intensity factor of the material.
11. Insertthe Boundary Condition.Choose one face asfixed support and oppositeface

“Pressure”and putapressure valueto apply the ten sile load.

1. Click on the Analysis Settings. Click the“Auto Time Stepping”“Off”.
2. Choose “number of substeps”40
3. Click on the fracture control-On,click Fracture-on,SIFS-YES,Turn Jinte graland other parameter off.
4. From solution choose total displacement, equivalentstress (Von Mises) and SIFS(KI).
5. Right Click on the“Static Structural ”and click on“Solve”.

Task2:Delivera5-minute Demonstration                                                      (10marks)

• Demonstrate the geometry and mesh generation and the model development. Create and submit a Loom video with webcam ON (showing your face) and screenc apture showing how you use Ansys Mechanical software to complete the tasks. The video length should NOT be more than 5 minutes. So, practice well before recording.

Important: This video is one of the mandatory requirements and ifyoud on’tsubmit this

video, your assess ment marks will be zero.

• The guidelines on how to create a Loom video: https://www.loom.com/share/159e007948ce4cb8acfee8a99615f388
  • The requirements are as follows:
  • Selectany one of the above questions in this assessment.
  • Create a LoomVideo:(a)Introduce your self(b)Demonstrate how you use Ansys Mechanical software and also explain (speak) the solution/simulation while you are running it.
  • Paste the link of you rrecording with in your assessmentreport.