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Relevance of impacter shape to nonvisible damage and residual tensile strength of a thick graphite/epoxy laminate
U.S. Government
Paperback. Books LLC, Reference Series 2011-10-03.
ISBN 9781234344276
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Förlagets beskrivning
Original publisher: Hampton, Va. : National Aeronautics and Space Administration, Langley Research Center, [1990] OCLC Number: (OCoLC)25052904 Subject: Space shuttles -- Propulsion systems -- Materials -- Impact testing. Excerpt: ... kinking is probably a result of the inplane compression stress due to the simulated impact combined with the lack of matrix support to the fibers. The maximum depths of fiber breaks for the deplled specimens from [ i0 ] are plotted in Fig. 9. Each symbol is an average of several tests. The damage depth was normalized by the contact radius. The filled symbols indicate visible damage on the surface, and the open symbols indicate nonvlslble damage. The maximum depths of the contours in Fig. 5 are also plotted in Fig. 9 for comparison. The compression allowable in Fig. 5 is based on the failing strain and Young's modulus of the composite. The shear allowable was chosen to give an upper bound to the damage depths in Fig. 9. Compression tests [ i0 ] gave an ultimate shear strength of 310 MPa ( 45.0 ksl ), which would have moved the curve for maximum shear stress to the right by 0.178 GPa ( 25.8 ksi ) in Fig. 9 and would have given a lower bound to the test data. The envelope of predicted damage depth is represented by the solid line. The damage far below the surface corresponds to the maximum shear stress criteria, and the damage near the surface corresponds to the maximum compression stress criteria. The maximum stress criteria represent the data quite well considering that the composite is neither homogeneous nor isotropic. Widths of the contours in Fig. 5 are approximately 1.6 times the depth [ I0 ]. The widths ( crack lengths ) from the tests were 2 to 3 times the depths. Hence, the maximum stress criteria tended to underpredict the width of damage, probably an effect of the transversely Isotropic nature of the composite. The maximum depths of impact damage from radiographs of the impacted specimens are plotted in Fig. 10. Recall th
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Relevance of impacter shape to nonvisible damage and residual tensile strength of a thick graphite/epoxy laminate
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