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Micromechanical Modeling of Two-Way Shape Memory Response of Semi-Crystalline Polymers Based on Equivalent Inclusion Method | ||
| Iranian Journal of Materials Forming | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 24 شهریور 1404 | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2025.53516.1335 | ||
| نویسندگان | ||
| Meisam Bakhtiari1؛ Keivan Narooei* 2 | ||
| 1K. N. Toosi University of Technology | ||
| 2K.N. Toosi university of Technology | ||
| چکیده | ||
| Two-way shape memory polymers (2W-SMPs) are a class of intelligent materials that demonstrate reversible form memory, rendering them suitable for various applications in response to external stimuli. During the phase transition in the shape memory cycle of semi-crystalline polymers, the 2W-SMPs are represented as a two-phase material, consisting of an amorphous matrix and the crystalline inclusions. This paper employs the Equivalent Inclusion Method (EIM), based on the Modified-Mori-Tanaka (MMT) approach, to determine the effective thermomechanical response of inclusions inside a heterogeneous matrix. Unlike existing phase transition models, the proposed model considered the interaction between phases and the morphology (shape and size) of the inclusion phase throughout the thermomechanical cycle. The model was implemented using the UMAT user subroutine of the ABAQUS software to simulate the mechanical behavior of SMPs. An investigation of various inclusion shapes revealed that ellipsoidal shapes most accurately represent the morphology of the inclusion phase. The analysis showed that a highly elongated ellipsoidal inclusion (a/c=1/25) best aligns with the simulation results. A fivefold increase in the (c/a) aspect ratio of the crystalline inclusions results in approximately 10% increase in crystallization-induced strain, improving consistency with shape memory experiments when the actual morphology is considered. The shape memory response of PCL under a stress of 250 kPa demonstrated a ~12.5% strain increase during cooling from 65 to -40 °C, with approximately 7% occurring near the crystallization point over a 40 °C interval. Incorporating phase interactions significantly enhanced the model's agreement with experimental results on shape recovery. | ||
| کلیدواژهها | ||
| Shape Memory Polymers؛ Micromechanics Modeling؛ Quasi Two-Way SME؛ Equivalent Inclusion Method؛ Mori-Tanaka model | ||
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