Evaluation and consideration of local specimen material properties in lifetime prediction of short fiber‐reinforced PA6T/6I

Abstract

To exploit the full material potential of short fiber‐reinforced PA6T/6I, specific component calculations including anisotropic material behavior is necessary. For this, different failure criteria and fatigue models are used to describe the behavior during a component service life. This paper deals with the determination and consideration of fiber orientations (FOs) for failure criteria and fatigue calculations. Therefore, a novel method to determine FO distributions across injection‐molded plates is proposed. The developed method allows a forecast of FOs for different specimen extraction positions and angles on injection‐molded plates by using only a few measured reference points. As a result, fatigue models can be calibrated with the strength values and the corresponding FO, calculated for fracture position. The performed tests show a non‐negligible influence of failure positions, due to FO distributions along the specimens. So, the FO determination method delivers an improvement in strength values estimation.

Effect of copolymerization on the thermal characteristics and behavior of crystallization of biobased semi‐aromatic PA10T/10I

“…At 2924 cm −1 , the stretching vibration of CH 2 contains symmetric and asymmetric peaks. The strong peaks at 1633 and 1540 cm −1 result from the CONH bending vibration (amide II) and the CO stretching vibration, respectively 23 . The CN stretching vibration (amide III) is primarily responsible for the absorption peak at 1296 cm −1 .…”

“…The strong peaks at 1633 and 1540 cm À1 result from the CO N H bending vibration (amide II) and the C O stretching vibration, respectively. 23 The C N stretching vibration (amide III) is primarily responsible for the absorption peak at 1296 cm À1 . The formation of the 856 and 639 cm À1 absorption peaks results from the C H on the benzene ring vibrating out-of-plane.…”

A modified energy‐based fatigue parameter for short fiber reinforced polymers: Performance analysis with varying thicknesses, load ratios, and fiber orientations

“…For the two thicknesses considered, the a xx displays a consistent distribution of the computed mean values at the scanned positions a , b , and c . Stadler et al 28 made a similar consideration when the FO along the flow direction was nearly constant. For the thicknesses 1.6 and 3 mm, the range of the mean value for the orientation tensor component a xx , considering all the extracted samples, was equal to 0.05 and 0.06, respectively.…”

On the use of milled shell‐only specimens to study the effect of fiber orientation on the fatigue behavior of a short fiber‐reinforced polyamide

“…[12][13][14] Alternatively, the resulting layered orientation from the injection molding simulation can be averaged through the thickness: this was done by Launay et al, 15 who used a modified Tsai-Hill fatigue criterion. 16 Stadler et al 17 also proposed a method in which the layered microstructure is neglected. The authors measured the fiber orientation distribution at specific locations of injection molded plates.…”