Accession Number : AD0466520

Title :   FATIGUE STRENGTH OF PLASTIC LAMINATES REINFORCED WITH UNWOVEN ''S'' GLASS FIBERS.

Descriptive Note : Final rept.,

Corporate Author : FOREST PRODUCTS LAB MADISON WI

Personal Author(s) : Boller, Kenneth H.

Report Date : MAY 1965

Pagination or Media Count : 17

Abstract : Fatigue curves are presented for plastic laminates reinforced with layers of unwoven ''S'' glass filaments in a matrix of epoxy-type resin and subjected to various alternating stress amplitudes superimposed on constant mean loads of 0 and 25,000 pounds per square inch tensile stress. The S-N curves were determined by axially loading specimens of three types of construction, namely: (1) all layers of unwoven glass parallel to the principal axis, (2) alternate layers at + or - 5 degrees to the principal axis, and (3) alternate layers at 0 and 90 degrees to the principal axis. All experiments were conducted on unnotched specimens, at 900 cycles per minute, in an atmosphere maintained at 73 F. and 50 percent relative humidity. Loads were applied parallel to the principal axis. The S-N curves and replication of specimens establishing the curves show that the fatigue strength of ''S'' glass laminates is significantly greater than that of similar ''E'' glass laminates. (Author)

Descriptors :   (*LAMINATED PLASTICS, FATIGUE(MECHANICS)), (*COMPOSITE MATERIALS, FATIGUE(MECHANICS)), REINFORCING MATERIALS, GLASS TEXTILES, SYNTHETIC FIBERS, GLASS, EPOXY RESINS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE