Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"thermoplastic composites"”.
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Autohesion model for thermoplastic composites
… bond development in AS4/P1700 unidirectional composites was performed. The double cantilevered beam (DCD) Mode l fracture toughness test was selected. The DCB specimens were fractured and healed in a special fixture with different combinations of temperature pressure, and time. The healed DCB …
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Ultrasonic welding of advanced thermoplastic composites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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On-Line Consolidation of Thermoplastic Composites
… constructed to fabricate composite parts from thermoplastic towpregs. A statistical approach was used to determine the significant processing parameters and their effect on the mechanical and physical properties of composite cylinders fabricated by on-line consolidation. A central composite …
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Characterization and Response of Thermoplastic Composites and Constituents
… molecular weight polyethylene (UHMWPE) composites. An effort is made to characterize the composites and their constituents. UHMWPE, as a polymer, is time and temperature dependent. Using time-temperature superposition (tTSP), the constituent properties are studied as a function of strain …
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The compounding of short fibre reinforced thermoplastic composites
… mechanical properties of short fibre reinforced thermoplastics do not correspond with the high mechanical properties of fibres used to reinforce them. A study is made into the methods of compounding reinforcing fibres into thermoplastics to produce short fibre reinforced thermoplastics of …
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Cellulose fiber reinforced thermoplastic composites: Processing and Product Charateristics
… impact on torque during melt processing of a thermoplastic cellulose ester (plasticized CAB); (b) their fiber incorporation and dispersion characteristics in a CAB-based composite by SEM and image analysis, respectively; and (c) their impact on the mechanical properties (under tension) of …
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Cellulose fiber-reinforced thermoplastic composites: surface and adhesion characterization
… the adhesion between wood fibers and thermoplastics. Direct applications include the development of better wood fiber composites and better paper coatings. The objectives of the study were two-fold. First, to quantify the effects of surface treatments on the surface properties, and, …
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Processing Approaches for Maintaining Multifunctionality in Advanced Thermoplastic Composites
Multifunctional composites typically consist of a functional additive imparting multiple functionalities to a polymer matrix. The production of these composites is not trivial, as the functionality of the particles must be retained during production, and the polymer matrix and particle interactions …
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Processing-Microstructure Models for Short- and Long-Fiber Thermoplastic Composites
Although these results are promising, the breakage models have only been applied to the mold cavity in injection molding simulation. Both a literature review and our experimental data strongly suggest that the majority of fiber length degradation occurs in the earlier stages of injection molding, …
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Toward thermal management of deformation behavior in uniaxial thermoplastic composites
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1988.
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Characterization of Carbon Mat Thermoplastic Composites: Flow and Mechanical Properties
Carbon mat thermoplastics (CMT) consisting of 12.7 mm or 25.4 mm long, 7.2 micrometer diameter, chopped carbon fibers in a polypropylene (PP) or poly(ethylene terephthalate) (PET) thermoplastic matrix were manufactured using the wetlay technique. This produces a porous mat with the carbon fibers …
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Structure/Property/Processing Relationships in Poss-Modified High Temperature Thermoplastic Composites
… since the 1980s. The majority of these polymer composites are fabricated using thermosetting epoxides due to the high service temperatures and weathering resistance associated with these systems. In recent years, however, interest has shifted to the use of high performance thermoplastics, such …
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Resin percolation and intimate contact in fast processing of thermoplastic composites
Fusion bonding of thermoplastic composites (TPCs) requires intimate contact before polymer interdiffusion and solidification can establish an interlaminar bond. The lack of such intimate contact results in voids or disbonds. This study showed through cross-sectional imaging and scaling analysis …
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An Investigation Into the Properties and Fabrication Methods of Thermoplastic Composites
<p>As applications for thermoplastic composites increase, the understanding of their properties become more important. Fabrication methods for thermoplastic composites continually improve to match designs specifications. These advanced thermoplastics have begun to show an improvement in mechanical …
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Interfacial strength development in thermoplastic resins and fiber-reinforced thermoplastic composites
… autohesive strength development in amorphous thermoplastic resins and fiber-reinforced thermoplastic prepregs. All tests were performed using polysulfone P1700 thermoplastic resin and AS4/P1700 graphite-polysulfone prepreg. Two test methods were examined to measure autohesion in neat resin …
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A feasibility study on using surface treated kaolin mineral in thermoplastic composites
… or a complement to glass fibers in nylon composites. An experimental approach is utilized to determine their properties and compare them to existing materials in the industry. Specimens are fabricated using a twin-screw tabletop micro-extruder for the first phase of the study, and a 75-ton …
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Manufacture of aerospace-grade thermoset and thermoplastic composites via nanoengineered thermal processing
… microfiber reinforcement with thermoset and thermoplastic polymer matrices. With the increasing use of such composites, the need for energy-efficient, cost-effective methods to produce composite structures is desired. Traditional curing processes such as autoclaves and ovens rely on …
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Modeling the High Strain Rate Tensile Response and Shear Failure of Thermoplastic Composites
… High Molecular Weight Polyethylene (UHMWPE) composites is of interest in applications where impact damage may occur. This response varies substantially with strain rate. However, physical testing of these composites is difficult at strain rates above 10^-1/s. A Monte Carlo simulation of …
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A study of the feasibility of advanced hybrid thermoplastic composites for aerospace and automotive applications
… the feasibility of developing an advanced hybrid thermoplastic composite for aerospace and automotive applications. This was done by first researching the types and functions of current thermoplastic composites used in the aerospace and the automotive industries. Thereafter, an advanced …
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The effect of the interphase/interface region on creep and creep rupture of thermoplastic composites
… properties, creep and creep rupture behavior of thermoplastic (J2) composites was investigated. The mechanical properties of the J2 composites were altered by systematic changes in fiber surface chemistry. Four fiber systems were used including the AU4, AS4(1) & (2), and AS4CGP fibers. (AS4(1) …
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