Analysis Of Scissor Jack 58f20

DEBRE BERHAN UNIVERSITY CALLAGE OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING

FEM ANALYSIS GROUP ASSIGNMENT TITLE:

ANALYSIS OF SCISSOR JACK GROUP 9

GROUP

ID NO

1 Dawit Debash

1446/05

2 Ermiyas Birhanu

1369/05

3 Mengistu Eniyew

1477/05

4 Asrat Abraham

937/05

5 Jemberu Mengistu

631/05

1, INTROUDUCTION Scissor jacks are simple mechanisms used to drive large loads over short distances in to translator motion. Most scissor jacks are similar in design. Consisting of four main memes driven by a power screw. The power screw of scissor jacks greatly reduce the amount of force required by the to drive the mechanism. This report is about fem analysis of already designed scissor jack with a software called ANSYS. This jack is designed for heavy duty vehicles and design load is taken 50,000 N.

ing frame

rivets Upper and lower links

Coupling nur

Fig 1: Scissor Jack component name

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2, MATERIAL PROPERTIES Structural steel is the material used for all components of the scissor jack. The following table briefly elaborates properties of this material. Those properties are taken at a reference temperature of 22 degrees Celsius.

Density

7.85e-006 kg/ mm3

Specific Heat

4.34e+005 mJ / kg C

Compressive Yield Strength MPa

200

Tensile Yield Strength MPa

250

Tensile Ultimate Strength MPa

460

Young's Modulus MPa

2.e+005

Poisson's Ratio

0.3

Shear Modulus MPa

76923

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3, ANALYSIS OF MAIN PARTS OF SCISSOR JACK 2.1 ANALYSIS OF ING FRAME Volume: 94629 mm³ Mass: 0.74284 kg

Fig 2: ing frame with 3 mm of mesh

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Fig 3: Load conditions 4

fig 4: von misses stress (66 auto scale)

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fig 5: total deformation (66 auto scale)

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2.1 ANALYSIS OF BASE Volume: 2.2164e+005 mm³ Mass: 1.7399 kg

Fig 6: base with 3 mm of mesh 7

fig 7: load conditions

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fig 8: von-mises stress (7.7e+002 (Auto Scale))

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fig 9: total deformation (7.7e+002 (Auto Scale))

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2.1 ANALYSIS OF TWO LINKS Volume: 1.7017e+005 mm³ Mass: 1.3358 kg

Fig 10: links with 6 mm mesh

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fig 11: load conditions 12

fig 12: von-mises stress with unreformed wireframe (1.2 (Auto Scale)) 13

fig 13: total deformation with unreformed wireframe (1.2 (Auto Scale)) 14

4, ANALYSIS OF SCISSOR JACK ASSEMBLY Volume: 1.0895e+006 mm³ Mass: sa

Fig 14: scissor jack with 6mm mesh 15

fig 15: load conditions 16

fig 16: total deformation (55 (0.5x Auto))

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fig 17: von-mises sress (55 (0.5x Auto))

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DRAWINGS

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