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The inelastic deformation behavior of PMR-15 neat resin, a
high-temperature thermoset polymer, was investigated at 288 degrees
C. The experimental program was designed to explore the influence
of strain rate on tensile loading, unloading, and strain recovery
behaviors. In addition, the effect of the prior strain rate on the
relaxation response of the material, as well as on the creep
behavior following strain controlled loading were examined. The
experimental data were modeled with the Viscoplasticity Based on
Overstress (VBO) theory. A systematic procedure for determining
model parameters was developed and the model was employed to
predict the response of the material under various test histories.
Additionally the effects of prior aging at 288 degrees C in argon
on the time (rate)-dependent behavior of the PMR-15 polymer were
evaluated in a series of strain and load controlled experiments.
Based on experimental results, the VBO theory was extended to
capture the environmentally induced changes in the material
response. Several of the VBO material parameters were expanded as
functions of prior aging time. The resulting model was used to
predict the high-temperature behavior of the PMR-15 polymer
subjected to prior aging of various durations.
A technical analysis of shape-memory polymers (SMPs) and their
composites, particularly in adaptive materials, this volume
introduces designs linking SMPs to metals, elastomers, foams,
nanoparticles and other materials, as well as the engineering of
SMPs directly into parts and active (morphing) components.
Attention is given to controlled structures activated by light,
heat, electricity and other energy sources, as well as the
connection of SMPs with actuators. Part one discusses the
activation and analysis of the shape memory response, including
shape recovery. Subsequent chapters offer modeling and other tools
for investigating the SMP response, including shape recovery. Part
three combines the response with micro- and macro-scale reinforcing
phases for producing SMP composites, and the following section
discusses synthetic and nanostructured customization of the shape
memory polymer response. The final section focuses on specific SMP
concepts in aircraft, including morphing skins, wings, unimorph
composite actuators for deployment, and variable stiffness
elements.Some of the highlights of the book include: Shape-memory
polymer chemistry and design for active materials and morphing
structures. Essential equations for analysis of the structure,
behavior and properties of SMPs. Many graphs and figures in full
color .
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