Wednesday  |  Allegheny  |  11:30 AM–11:50 AM

#13778, Dynamic Fracture Analysis of Rubber Toughened Additively Manufactured Thermosets

This study examines the role of a second phase bio-rubber addition on the dynamic fracture behavior of photopolymer resin DA-4-20 and compares it with base resin DA-3. These thermosetting polymers are formed through an additive manufacturing (AM) method known as digital light processing (DLP), a vat photopolymerization process allowing for rapid, agile manufacturing of polymeric parts to produce lightweight components. Preliminary efforts have demonstrated that the addition of rubber to these thermosets increases the fracture resistance under quasi-static and stress wave driven loading, but the toughness improvement is somewhat mitigated under impulsive loading conditions and will be explored further. A unique long-bar striker device is used to impact a specimen opposite the notch and pre-crack to induce impulsive crack loading, initiating a dominantly Mode-I, or opening fracture event. Digital image correlation (DIC) is used in conjunction with ultra-high-speed imaging to obtain full-field displacement data during loading and subsequent crack propagation. The Mode-I stress intensity factors (SIF) are extracted from the full-field data via an elastodynamic solution using a least squares fit at crack initiation.

Megan Shepherd   Colorado School of Mines
Kamran Makarian   Drexel University
Jaclyn McLaughlin   Drexel University
Giuseppe Palmese   Rowan University
Leslie Lamberson   Colorado School of Mines