TY - JOUR
T1 - Bending shape recovery of unidirectional carbon fiber reinforced epoxy-based shape memory polymer composites
AU - Li, Fengfeng
AU - Scarpa, Fabrizio
AU - Lan, Xin
AU - Liu, Liwu
AU - Liu, Yanju
AU - Leng, Jinsong
PY - 2019/1
Y1 - 2019/1
N2 - The thermo-mechanical properties of unidirectional carbon fiber reinforced epoxy-based shape memory polymer (SMP) composites with fiber mass fractions of 16%, 23%, 30%, 37% are evaluated by using three-point bending tests. The SMP composites show temperature-dependent flexural modulus and strength, with one order of magnitude difference between 120 °C and 20 °C. The composites show good shape recovery capability, with measured recovery ratios of more than 93% at 120 °C and 100% after 20 min at that temperature. The recovery stresses increase nonlinearly during reheating; the maximum recovery stress is approximately proportional to the fiber mass fraction. The composites show recovery capability under external loads, with the recovery ratio being inversely proportional to the partial load level. The composites feature good shape memory properties during cyclic loading and unloading at 120 °C. Their loss factors and stiffness losses decrease significantly during the first three cycles, and then stabilize after ten cycles.
AB - The thermo-mechanical properties of unidirectional carbon fiber reinforced epoxy-based shape memory polymer (SMP) composites with fiber mass fractions of 16%, 23%, 30%, 37% are evaluated by using three-point bending tests. The SMP composites show temperature-dependent flexural modulus and strength, with one order of magnitude difference between 120 °C and 20 °C. The composites show good shape recovery capability, with measured recovery ratios of more than 93% at 120 °C and 100% after 20 min at that temperature. The recovery stresses increase nonlinearly during reheating; the maximum recovery stress is approximately proportional to the fiber mass fraction. The composites show recovery capability under external loads, with the recovery ratio being inversely proportional to the partial load level. The composites feature good shape memory properties during cyclic loading and unloading at 120 °C. Their loss factors and stiffness losses decrease significantly during the first three cycles, and then stabilize after ten cycles.
KW - Isothermal mechanical property
KW - Shape memory polymer composite
KW - Shape recovery property
KW - Three-point bending
KW - Unidirectional carbon fiber
UR - http://www.scopus.com/inward/record.url?scp=85056182254&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2018.10.037
DO - 10.1016/j.compositesa.2018.10.037
M3 - Article (Academic Journal)
AN - SCOPUS:85056182254
SN - 1359-835X
VL - 116
SP - 169
EP - 179
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
ER -