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The effect of strain rate on the orientation of the fracture plane in a unidirectional polymer matrix composite under transverse compression loading

: May, Michael; Ledford, Noah; Isakov, Matti; Hahn, Philipp; Paul, Hanna; Nagasawa, Sumito


Composites. Part A, Applied science and manufacturing 138 (2020), Art. 106057, 15 S.
ISSN: 1359-835X
Fraunhofer EMI ()
polymer-matrix composites (PMCs); fracture; impact behavior; mechanical testing; Hopkinson Pressure Bar

Transverse compression tests on a unidirectional composite were performed under quasi-static and high-rate loading conditions using servo-hydraulic machines as well as a direct impact Hopkinson bar. Aside the expected increase of compressive strength with increasing loading rate, a change of fracture plane orientation was observed. For quasi-static loading conditions, the fracture angle was 54.5°, for high rate-loading conditions this increased to 65°. Assuming a Mohr-Coulomb type of fracture for unidirectional composites under transverse compression loading, the change of fracture plane orientation indicates a rate dependency of the internal friction angle ϕ, which has not previously been reported for composite materials.