STUDY OF STRESSES NEAR A DISCONTINUITY IN A FILAMENT-REINFORCED COMPOSITE METAL
Abstract
A study is made of stresses in the vicinity of discontinuities in filaments in filament-reinforced, composite materials. Formulas are derived for the calculation of local stresses in filament or binder, and for the shear stresses induced between them. Sample calculations (in both elastic and plastic stress ranges) show that disturbances from the general stress level are primarily local, near the discontinuity, and particularly that the shear stress between fiber and binder is apt to rise to a high peak value at the discontinuity. The magnitude of this peak is shown to be governed by a parameter, defined in the report, which also governs the length of filament required to approach infinite length in effectiveness. Thus any attempts to reduce the shear stress, as by permitting yielding of the binder, will also increase the filament length required for effective reinforcement. The conclusion is reached that the accommodation of the high peak shear stresses at discontinuities may well be the crux of the attainment of the potentials apparently available with high-strength filaments or ''whiskers'' as reinforcements for composite materials.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1963
- Accession Number
- AD0414673
Entities
People
- Norris F. Dow
Organizations
- General Electric