Abstract
UD glass/PA6 coupons with an open hole are subjected to tensile and compressive loading. Three layups: [0/90]5s, [+45/−45]5s and [+45/0/−45/90]3s with a shape based on ASTM D5766 were tested. Both monotonic loading as well as loading–unloading–reloading tests were executed. The strain field on the sample surface was measured with digital image correlation. This allowed identifying the distribution of the strain field during loading, permanent deformation and the evolution of the sample elastic modulus. This information is not frequently measured. Yet, it is vital for the development and validation of advanced failure models. The results indicate that the thermoplastic matrix allows large plastic deformation under tensile loading for the specimens with layup [+45/−45]5s. In addition, the specimen elastic modulus reduces by about 70%. The other layups show minor permanent deformation, while the elastic modulus reduces by up to 15%. Furthermore, the quasi-isotropic laminate shows a significant post-failure load-bearing capacity under compression loading. The results are complemented with post-mortem damage and fracture observations using optical microscopy and ultrasound inspection.
Highlights
Technical continuous fiber-reinforced polymers (FRP) where carbon or glass fibers are combined with a thermoplastic (TP) polymer matrix are strong candidates for use in the mass production of composite structures
Before TP-FRP can be used in structural design, the mechanical behavior under several loading conditions must be known
UD glass/PA6 laminates with an open hole are subjected to tension and compression loading
Summary
Technical continuous fiber-reinforced polymers (FRP) where carbon or glass fibers are combined with a thermoplastic (TP) polymer matrix are strong candidates for use in the mass production of composite structures. Gavande and Anand [10] studied open-hole tension (OHT) and compression strength of woven. Compared to an equivalent TS carbon/epoxy material, Gavande and Anand [10] report a higher shear modulus and shear strength This is not surprising, considering that 1) these properties are matrix-dominated and. The study reports decreasing strength and stiffness with increasing temperature and humidity This is similar behavior when compared to TS carbon/epoxy. UD glass/PA6 laminates with an open hole are subjected to tension and compression loading. Both monotonic and loading–unloading–reloading (LUR) tests were executed to identify the evolution of specimen stiffness and developing permanent strain on the specimen surface. Additional to the strain field, optical microscopy and transmission ultrasound inspection is used to reveal the main damage areas and damage morphology
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