ISSN: 0884-6804
Page Count: 9

A Study of Failure Characteristics in Thermoplastic Composite Material at 250°F (121°C)
Palazotto, AN
Professor, Air Force Institute of Technology, Wright-Patterson Air Force Base, OH

Fisher, JM
Robins Air Force Base, GA

Sandhu, RS
Aerospace engineer, Structural Concepts Branch, Structures Division, Wright Laboratory, Wright-Patterson Air Force Base, OH

Abstract

A study was conducted to investigate the failure characteristics of thermoplastic composite graphite/polyetheretherketone (Gr/PEEK) at 250°F (121°C). The stacking sequences of specimens used in the study were [0°]¹⁶, [90°]¹⁶, [±45°]⁴⁵, and [0°/±45°/90°]^2s. Specimens of the first three ply layups, namely, [0°]¹⁶, [90°]¹⁶, and [±45°]^4s were used to determine the basic stress-strain data at 250°F (121°C). In addition, specimens containing a hole (one-third diameter-to-width ratio) corresponding to all the four stacking sequences were manufactured to determine the stress-strain response, the progression of failure, and ultimate tensile strengths. Testing the specimens with ply layups of [±45°]^4s and [0°/±45°/90°]^2s containing ±45° plies was complicated by the development of high strains, thereby causing the strain gages to peel off during tests.

Keywords:
high-temperature testing, composite materials, thermoplastics, failure characteristics, stereo X-rays, testing, thermal effects, laminates

Paper ID: CTR10220J
DOI: 10.1520/CTR10220J
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