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Considerations and solutions in evaluating thermal stresses in a composite cylinder

Given are details of experimental work in using bonded strain gages to measure thermal stresses in composite cylinders

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Abstract

Stresses resulting from temperature changes during thermal cycling over the range −44 to 125° C were measured in a composite open-end tube consisting of an inner cylinder of cured epoxy-impregnated glass tape and an outer cylinder of flexible epoxy casting resin. The composite tube was 12-in. long and 12.5-in. I.D. The inner cylinder had a 0.13-in.-wall thickness and the casting resin was 0.75-in. thick. Using resistance strain gages, the stresses were determined experimentally at various temperatures on the inner surface of the glass-tape cylinder, on the outer surface of the casting resin, and at the interface between the two materials. Because unusual problems were encountered in using strain gages for the above measurements and because the work done to overcome the problems has other practical applications, this paper presents detailed description of the experimental work and the results obtained.

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Abbreviations

E :

Young's modulus

GF C :

gage-factor correction

σ:

stress

ε:

strain

ε′:

apparent strain

μ:

Poisson's ratio

G :

epoxy glass tape

R :

epoxy casting resin

L :

longitudinal direction

LGA :

longitudinal direction (L), glass tape (G), radiusA or inner surface (A), see Fig. 1

LGA, REF :

reference or base-line reading forLGA data

LGB :

longitudinal direction (L), glass tape (G), radiusB or interface (B)

LGB, REF :

reference or base-line reading forLGB data

LRB :

longitudinal direction (L), casting resin (R), radiusC or outer surface (C)

LRC, REF :

reference or base-line reading forLRC data

T :

tangential direction

TGA :

tangential direction (T), glass tape (G), radiusA or inner surface (A)

TGA, REF :

reference or base-line reading forTGB data

TRB :

tangential direction (T), casting resin (R), radiusB or interface (B)

TRB, REF :

reference or base-line reading forTRB data

TRC :

tangential direction (T), casting resin (R), radiusC or outerface (C)

TRC, REF :

reference of base-line reading forTRC data

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Authors and Affiliations

  1. Materials Testing and Evaluation Laboratory, Research and Development Center, Westinghouse Electric Corp., 15235, Pittsburgh, Pa.

    Arthur J. Bush

Authors
  1. Arthur J. Bush
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Bush, A.J. Considerations and solutions in evaluating thermal stresses in a composite cylinder. Experimental Mechanics 11, 87–93 (1971). https://doi.org/10.1007/BF02320627

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  • DOI: https://doi.org/10.1007/BF02320627

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