Design and Structural Analysis of the Modular Pallet System Developed for Container Roll In/Out Platform (CROP) - PowerPoint PPT Presentation

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Design and Structural Analysis of the Modular Pallet System Developed for Container Roll In/Out Platform (CROP)

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Design and Structural Analysis of the Modular Pallet System Developed for Container Roll In/Out Platform (CROP) Principal Investigator Dr. M. C. Altan – PowerPoint PPT presentation

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Title: Design and Structural Analysis of the Modular Pallet System Developed for Container Roll In/Out Platform (CROP)


1
Design and Structural Analysis of the Modular
Pallet System Developed for Container Roll In/Out
Platform (CROP) Principal Investigator Dr. M.
C. Altan Undergraduate Assistants Brad Williams
and John Byers School of Aerospace and
Mechanical Engineering University of
Oklahoma November 2005
2
Project Motivation Improvement of a Loaded
Container Roll In/Out Platform (CROP)
  • Current Obstacles
  • Technical and time consuming packing methods
  • Battlefield clutter
  • Wood importation restrictions
  • Non-reusable wood pallets and packaging

3
Project Objectives
  • Detailed design of a modular pallet system used
    for ammunition transport
  • Achieve flexible design to accommodate multiple
    loading configurations
  • Development of a finite element model for
    structural analysis
  • Structural analysis of the assembled modular
    pallet
  • Analysis of stress distribution and deformation
    induced under various loading

4
Project Activities
  • Convert existing concept design into a Pro/E
    model
  • Prepare engineering drawings with detailed
    dimensions
  • Consider potential materials and manufacturing
    methods
  • Review possible prototyping
  • Review and analysis of alternative materials
  • Finite element structural analysis
  • Stress state under various loading conditions.
  • Deformation characteristics under various loading
    conditions.

5
Modular Pallet Information
  • A single module has only three different parts
  • One Pallet Top
  • One Pallet Bottom
  • Four Identical Pallet Sides
  • Each module can assembled and disassembled
    completely without any tools.
  • Modular pallets are completely reusable, minimize
    battlefield clutter.
  • Parts are stackable upon disassembly
  • This allows for efficient shipment of empty
    pallets.
  • Once a pallet is disassembled, its top, bottom,
    and four side walls can be stacked and strapped
    to the CROP.
  • Multiple disassembled modules can be shipped
    easily.

6
Modular Pallet Information
  • All single pallet modules are identical, thus the
    same sliding assembly method is used for all.
  • Slide-in panels are used to create compartments.
  • Each pallets module can be subdivided into eight
    smaller compartments. These compartments make the
    pallets more versatile in the types of munitions
    they can carry.
  • Side and vertical locking eliminates strapping
    and complications arising from end loads such as
    chimney stacks.
  • Side interlocking system is used. The two
    adjacent modules are interlocked at the pallet
    bottom.
  • Self-locking vertical interlocking system is
    used.

7
Modular Pallet Design 3-D View of Assembled Pallet
8
Modular Pallet Design Two Walls, Base, Top, and
an Insert
9
Finite Element Analysis (FAE) Mesh Developed
Using ProE
  • 70,722 tetra solid elements
  • Minimum element angle of 5 degrees
  • Maximum element angle of 95 degrees
  • Materials Analyzed
  • Wood Oak
  • Aluminum 2024
  • Vectra A Liquid Crystal Polyester
  • Vectra B230 Liquid Crystal Polyester with 30
    carbon fibers

10
Finite Element Analysis Loading Configuration
Combined Uniform Loading On Top and Bottom Pallet
Surfaces This loading represent loaded and
stacked pallets
Loading is applied on shaded surfaces on top and
bottom pallet parts
Top
Bottom
11
Finite Element Analysis Sample Results
5000 lb top 5000lb internal load Represents
Loaded and Stacked PalletsMaterial Aluminum
Maximum principal stress of 77,200 KPa (11,200
psi) Minimum principal stress of 255,100 KPa
(37,000 psi) compressive Analysis ended with 0.9
convergence of maximum principal stress
Principal Stresses
12
Results Summary Material Comparison
1,500 lb top 1500 lb bottom
loading
Maximum Principal Stress Magnitude (psi) Maximum Displacement (in) Max Total Load (lb) Pallet Weight (lb)
Aluminum 6,500 (18 of yield) 0.010 18,000 542
Vectra A 6,300 (62 of yield) 0.120 4,600 273
Vectra B230 6,300 (21 of yield) 0.024 14,600 290
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