Preliminary Structural Analysis Results Impact Tester Frame

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Preliminary Structural Analysis Results - Impact
Tester Frame

• By Roger Jansen
• March 6, 2008

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Impact Tester - Frame

• Background Information

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Impact Tester - Frame
Seat Back Support
38.5
Vertical Adjustment Post
Proposed Bed Plate (1/2 Thick)
Proposed Base Structure (12 x 6 x 3/16 Tubing)
Generic Bucket Seat

• Basic Seat Orientation

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Impact Tester - Frame
F 1176 lb

• Head Rest Impacted with 14.7lb. Mass
• Max. Deceleration 80g
• Therefore Maximum Force on Structure can be found
  be Fma 1176 lb.

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Impact Tester - Frame
F 588 lb
F 588 lb

• Assume Load is Imparted Evenly to each Vertical
  Adjustment Post gt F 588 lb.

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Impact Tester Worst Case
F 588 lb
F 588 lb
h 35
h 35

• Maximum Vertical Position is 35 above the bed
  plate

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Impact Tester - Frame

• Summary of Contacts/Boundary Conditions
• and Applied Load

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Impact Tester - Frame
Utilizing Symmetry a Half-Model was Simulated
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Impact Tester - Frame
Base Modeled with Bonded Contacts
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Impact Tester - Frame
Vertical Post Modeled with Bonded Contacts
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Impact Tester - Frame
Ends of Bolts Bonded to Bedplate
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Impact Tester - Frame
Washer Surface Bonded to Footplate
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Impact Tester - Frame
Footplate Modeled with Frictional Contact to the
Bedplate
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Impact Tester - Frame
Fixed Displacement/Rotation
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Impact Tester - Frame
Symmetry Constraint
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Impact Tester - Frame
Bolt Clamp Load
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Impact Tester - Frame
Applied Force
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Impact Tester - Frame

• Description of Material Model

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Impact Tester - Frame

• Linear Material Model
• E 29 x 106 psi
• Poisson's Ratio 0.3
• Assume All Material is Std. Structural Steel
  (A36)
• Sy 36ksi
• Su 50ksi
• Assume Bolts Have a Proof Strength of 120,000psi

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Impact Tester - Frame

• Description of Mesh

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Impact Tester - Frame
Mesh
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Impact Tester - Frame
Mesh
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Impact Tester - Frame
Mesh
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Impact Tester - Frame

• Global Element Size Program Controlled
• Number of Nodes 29,897
• Mid-side Nodes Program Controlled
• Number of Elements 9,360
• Types of Elements Used SOLID186, SOLID187,
  TARGE170, CONTA174 SURF154

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Impact Tester - Frame

• Summary of Results

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Impact Tester - Frame
Force Convergence Chart
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Impact Tester - Frame
Total Deformation
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Impact Tester - Frame
Total Deformation
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Impact Tester - Frame
Contact Analysis on Footplate
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Impact Tester - Frame
Total Deformation
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Impact Tester - Frame
Equivalent Stress
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Impact Tester - Frame
Note Allowable Stress 36ksi
Equivalent Stress Foot Plate
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Impact Tester - Frame
Note Allowable Stress 36ksi
Equivalent Stress Bed Plate
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Impact Tester - Frame
Note Allowable Stress 36ksi
Equivalent Stress Forward Inside Gusset
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Impact Tester - Frame
Note Allowable Stress 36ksi
Equivalent Stress Forward Outside Gusset
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Impact Tester - Frame
Note Allowable Stress 36ksi
Equivalent Stress Backside Outside Gusset
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Impact Tester - Frame
Note Allowable Stress 36ksi
Equivalent Stress Vertical Post
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Impact Tester - Frame
Note Allowable Stress 120ksi
Equivalent Stress Bolts
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Impact Tester - Frame

• Conclusions
• Allowable Stress is not exceeded in any part
• Maximum Deformation 0.021