Title: DURABILITY AND DAMAGE TOLERANCE OF CHOPPED FIBER COMPOSITE PP-SGF30
Abstract: Short-fiber reinforced polymer (SFRP) composites usually consist of particles that are slender, relatively short compared to the overall dimensions of the part, and imperfectly distributed in a continuous-phase matrix. Although not as stiff or as strong as their continuous counterpart, they have several attractive characteristics. In fact, their capability of being manufactured in complex geometries to conform to the desired shape without being damaged or distorted, their isotropic behavior, and their low fabrication costs are enough to make short-fiber reinforced composites the material of choice. Multi-scale modeling with de-homogenized approach is employed to consider the effect of fiber length increase and its associated manufacturing defects.
Simulation of PP-SGF30 coupons subject to static and fatigue of various mold flow directions was validated with test. The simulation shows material characterization with defects using both static and fatigue properties to reverse engineer linear, nonlinear (stress-strain) and fatigue (stress-cycle) properties for both fiber and matrix constituents. Tensile strength, elastic modulus, and fatigue life decreased with specimen mold flow direction and proposed multi-scale damage mechanics criteria were found to correlate variation of static and fatigue properties.
Authors: Saber DorMohammadi, Harsh Baid, Max Repupilli, and Frank Abdi
Conference: CAMX 2017 –Orlando