An analysis of residual thermal stresses in a unidirectional graphite/PMR-15 composite based on X-ray diffraction measurements

A micromechanical study of residual stress and its effect on transverse failure in polymer–matrix composites

“…Destructive methods, such as hole-drilling (Rendler and Vigness, 1966), sectioning/cutting (Gascoigne, 1994) and first-ply failure test (Kim and Hahn, 1979), require the specimen to be destroyed during testing and therefore cannot be used for in situ measurements. Non-destructive tests include warpage/curvature measurements (Dannenberg, 1965), the cure-reference method (Ifju et al, 2000) and techniques using embedded sensors (strain gauges, fibre optics or crystalline materials) with an X-ray or neutron diffraction method (Kesler et al, 1998;Benedikt et al, 2001). As far as analytical methods are concerned, residual stresses in composites are generally studied on the macro-and meso/microlevels.…”

Mechanical response of a unidirectional graphite fiber/polyimide composite as a function of temperature

“…The volume fraction of fibers in the T650-35/PMR-15 composite was measured in [9] using the acid digestion technique and was found to be 55.6 ± 0.6% with the void content less than 2% [9]. In addition to the data in Table 1, the elastic properties of the composite at RT were also measured by Rupnowski et al [25] by employing the three-component oscillator (resonance) method [28].…”

Preparation and properties of T300 carbon fiber‐reinforced thermoplastic polyimide composites

“…To improve the toughness of advanced composites, the thermoplastic resin-based composites need to be explored further. [2][3][4] The advanced thermoplastic composites can be prepared by directly using prepregs or combining prepregs with resin films. The latter is a flexible method to prepare the advanced composites.…”