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Experimental Mechanics

, Volume 16, Issue 5, pp 194–199 | Cite as

The strength of hard-metal-plated plastic type units

The relation between cracking of hard-metal-plated plastic type units and the stress distributions is investigated. Stress analysis is done with photoelastic method and finite-element method
  • Y. Hiraoka
  • A. Tago
Article

Abstract

This paper is concerned in the problems of strength of type units of hard-metal-plated plastic type wheel. The initiation and the propagation of the crack in type units are investigated by the type-damaging test. The stress analysis in type units is done with the photoelastic method and the finite-element method, the correspondence of the stress distribution to the position of the damage is examined. The results obtained are as follows:
  1. (1)

    The damage of type units depends mostly on the crack of metal film, and the crack occurs on the plastic side of metal film under the load position and propagates to outer side. The position of initiation of the crack corresponds to that of the maximum tensile stress caused in metal film.

     
  2. (2)

    Among some factors, thickness of plated metal, profile of the tip of type units and modular ratio of plated metal to plastics are main factors to control the stress pattern.

     

Keywords

Mechanical Engineer Fluid Dynamics Tensile Stress Stress Distribution Stress Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of Symbols

E

elastic modulus, Kg/mm2

L

loading head

M

plastic body

P

load, Kg/mm

R

metal film

a

contact width, mm

h

height of model, mm

p

maximum pressure in the contact area, Kg/mm2

q

load per unit thickness, Kg/mm

r

type-apex curvature, mm

t

metal-film thickness, mm

x

horizontal distance from axis of symmetry, mm

y

vertical distance from loading point, mm

σx,σy

normal stress along axis x, y, Kg/mm2

σn

normal stress on the metal side of the boundary surface, Kg/mm2

σs

normal stress in metal film, Kg/mm2

τ

shear stress, Kg/mm2

α

photoelastic sensitivity, mm/Kg

θ

type-apex angle

ν

Poisson ratio

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References

  1. 1.
    Ishihara, A., et al., “Development of Hard Metal Plated Plastic Type Wheel,”Rev. of the E.C.L., NTTPC, Japan,18,575–588 (1970).Google Scholar
  2. 2.
    Burmister, D. M., “The Theory of Stresses and Displacements in Layered Systems,”J. Appl. Phys.,16,89 (1945).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1976

Authors and Affiliations

  • Y. Hiraoka
    • 1
  • A. Tago
    • 1
  1. 1.Musashino Electrical CommunicationLaboratory Nippon Telegraph and Telephone Public CorporationMusashino-shi, TokyoJapan

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