... A research program is underway to experimentally characterize the strain rate dependent deformation and failure response of polymer matrix composites subject to high strain rate impact loads and to develop strain rate dependent deformation and failure models for the analysis of these types...

.... The models are used to reduce laminate-specific microcracking data to general design data in the form of fracture toughness versus cycle ( G Ic ( N )) curves. accelerated aging damage degradation design durability environmental effects material properties polyimides polymer matrix composites...

... in the characterization. Behavior of the two composite systems is compared and checked for consistency using a micromechanical model. polymer matrix composites nonlinear viscoelasticity constitutive equation off-axis angle-tabs damage rubber-toughened Robert T. Bocchier? and Richard A. Schapery ~ Nonlinear...

.../180°C. thermomechanical fatigue damage tolerance sheet molding compound PMR-15 creep residual properties micro-structural damage fiber distribution graphite fiber T650-35 polymer matrix composites Michael G. Castelli, 1 James K. Sutter, 2 and Dianne Benson 3 Durability and Damage...

.... The life prediction for the combined loading is compared to 90°C tensile-tensile fatigue data. This comparison shows good correlation between the prediction and data and demonstrates the method's effectiveness in life prediction modeling. life prediction fatigue elevated temperature polymer matrix...

... method for strength can be developed and the evidence that such a method is needed. accelerated testing superposition polymer matrix composites strength J. R. Reeder, ~ D. H. Allen, 2 and W. L. Bradley 2 Accelerated Strength Testing of Thermoplastic Composites REFERENCE: Reeder, J. R., Allen...

... to interpret. In particular, the spatial non-uniformity of degradation converts originally simple specimens into complex structures with non-uniform chemical and mechanical states. Consideration of this complexity is vital to the full understanding of the results of such tests. polymer matrix composites...

... for the mechanical properties of fibers and matrix in order to achieve a successful treatment are suggested from this approach. thermomechanical treatment polymer matrix composites mechanisms transverse crack formation property improvements glass transition epoxy carbon fiber frozen in stresses...

... G Ic remains constant after extensive hygrothermal conditioning; (5) the diffusion kinetics are Fickian in general, except for a few non-Fickian anomalies that are related to development of transverse microcracks. polymer matrix composites polyimide matrix graphite fibers moisture...

... and plastic properties. The results indicate that both in situ elastic and plastic properties of the matrices are orthotropic. micromechanics polymer matrix composites temperature plasticity off-axis testing composite materials testing design Thomas S. Gates, 1 Jun-Lin Chen, 2 and Chin Tech...

... on composite tensile and compressive strength. Both tensile and compressive strength were unaffected by the mat interleaf. polymer matrix composites interleaved composites graphite/epoxy end notch flexure ENF Eileen Armstrong- Carrolll and Roland Cochran 1 Improvement of Delamination Resistance...

... development. This behavior was found to be best described by fitting a hyperbolic function to the microcrack density as a function of the number of thermal cycles. epoxy-cyanate blend graphite fibers microcracking polymer matrix composites space structures thermal cycling Brian J. Knouff...

... in the wet composites numerous bare debonded fibers were observed, which substantiates that the reduction in transverse strength is largely due to fiber/matrix interfacial degradation. polymer matrix composites marine environment transverse strength interfacial degradation scanning electron...

... aluminum. polymer matrix composites metal matrix composites compression testing compression fatigue compression testing of neat resin K. Schulte 1 Compressive Static and Fatigue Loading of Continuous Fiber-Reinforced Composites2 REFERENCE: Schutte, K., "Compressive Static and Fatigue Loading...

... predict 4% HDS for all nominal and oversize diameters tested. The proposed model, which is a variation of the point stress characteristic distance hypothesis, reflects the nonconstant features of the Hoffman failure contour at points removed from the hole boundary. polymer matrix composites...

... An innovative research effort has been directed at developing a high-temperature-resistant polymer matrix composite in responding to the need of high specific strength/stiffness materials at elevated service temperatures for high-speed-flight vehicles. A new polyimide with glass transition...

... at the film-plasma grafted polymer interface. Additional optimization of the film-grafted polymer bond is necessary for improved performance. polymer matrix composites interleaved composites plasma treatment Eileen Armstrong-Carroll, 1Bassel Iskandarani, 2 Ihab Kamel, 2 and Thomas M. Donnellan t...