The strength of hard-metal-plated plastic type units
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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.
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.
KeywordsMechanical Engineer Fluid Dynamics Tensile Stress Stress Distribution Stress Analysis
List of Symbols
elastic modulus, Kg/mm2
contact width, mm
height of model, mm
maximum pressure in the contact area, Kg/mm2
load per unit thickness, Kg/mm
type-apex curvature, mm
metal-film thickness, mm
horizontal distance from axis of symmetry, mm
vertical distance from loading point, mm
normal stress along axis x, y, Kg/mm2
normal stress on the metal side of the boundary surface, Kg/mm2
normal stress in metal film, Kg/mm2
shear stress, Kg/mm2
photoelastic sensitivity, mm/Kg
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