Abstract
Results of static fracture tests on PMMA plates with part-elliptical cracks at fastener holes are presented. Experimental configurations include three crack locations with respect to both open and loaded holes. During static testing, slow growth prior to specimen separation allows for calculation of the maximum stress-intensity factor and identification of the location on the crack border at which it occurs. The testing techniques developed produce a simple, economical means of experimentally validating theoretical analyses of crack problems.
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Abbreviations
- AK ic :
-
apparent fracture toughness
- a,c :
-
crack semi-axes (described in Fig. 1)
- b :
-
crack minor axis
- d :
-
hole diameter
- K 1 :
-
Mode-one stress-intensity factor
- K IC :
-
fracture toughness
- M 1 :
-
front-surface correction factor
- M 2 :
-
back-surface correction factor
- MF :
-
magnification factor
- P :
-
applied load
- Q/P :
-
load-transfer ratio
- t :
-
plate thickness
- w :
-
plate width
- σ:
-
remote mean normal stress,\(\sigma = \frac{P}{{wt}}\)
- σ b :
-
fastener-hole bearing stress,\(\sigma _b = \frac{P}{{dt}}\)
- σ ys :
-
yield strength
- β:
-
angle around fastener hole, measured from the crack plane
- ϕ:
-
crack-shape parameter; the complete elliptic integral of the second kind
References
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Kullgren, T.E., Smith, F.W. Static fracture testing of PMMA plates having flawed fastener holes. Experimental Mechanics 20, 95–102 (1980). https://doi.org/10.1007/BF02321234
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DOI: https://doi.org/10.1007/BF02321234