NDLI: Interlaminar shear fracture toughness and fatigue thresholds for composite materials

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Interlaminar shear fracture toughness and fatigue thresholds for composite materials

Content Provider	NASA Technical Reports Server (NTRS)
Author	Murri, Gretchen B. Obrien, T. Kevin Salpekar, Satish A.
Copyright Year	1987
Description	Static and cyclic end notched flexure tests were conducted on a graphite epoxy, a glass epoxy, and graphite thermoplastic to determine their interlaminar shear fracture toughness and fatigue thresholds for delamination in terms of limiting values of the mode II strain energy release rate, G-II, for delamination growth. The influence of precracking and data reduction schemes are discussed. Finite element analysis indicated that the beam theory calculation for G-II with the transverse shear contribution included was reasonably accurate over the entire range of crack lengths. Cyclic loading significantly reduced the critical G-II for delamination. A threshold value of the maximum cyclic G-II below which no delamination occurred after one million cycles was identified for each material. Also, residual static toughness tests were conducted on glass epoxy specimens that had undergone one million cycles without delamination. A linear mixed-mode delamination criteria was used to characterize the static toughness of several composite materials; however, a total G threshold criterion appears to characterize the fatigue delamination durability of composite materials with a wide range of static toughness.
File Size	17723477
Page Count	68
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870017553
Archival Resource Key	ark:/13960/t80k78d25
Language	English
Publisher Date	1987-08-01
Access Restriction	Open
Subject Keyword	Composite Materials Fatigue Tests Finite Element Method Thermoplastic Resins Epoxy Matrix Composites Strain Energy Release Rate Cyclic Loads Delaminating Shear Stress Cracking Fracturing Fracture Strength Static Tests Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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