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Nonpolluting Composites Repair and Remanufacturing for Military Applications
Polymer-matrix composite material and structural adhesive repair and manufacturing have significant environmental costs. These costs were recently documented based on current and anticipated future Department of Defense (DOD) use of these materials. The principal issues for reducing the environmental impact and its associated cost are (1) reduction in hazardous waste by eliminating shelf-life limitations, (2) reduction in nitrogen oxides by replacing global heating of the part with localized heating, (3) reduction in volatile organic compound (VOC) emissions by accelerated curing and containment, and (4) reduction in hazardous waste by minimizing production debris through processing step man...
Non-Polluting Composites Repair and Remanufacturing for Military Applications: An Environmental and Cost-Savings Analysis
Polymer-matrix composite material and structural adhesive repair and manufacturing have significant environmental cost. These costs are documented based on current and anticipated future Department of Defense use of these materials. This special report first establishes an environmental baseline by identifying the hazardous materials encountered during composite repair and manufacturing operations and presents conservative estimates of usage and waste production. The principal issues for reducing the environmental impact and its associated cost are: (1) reduction in hazardous waste by eliminating shelf-life limitations; (2) reduction in nitrogen oxides by replacing global heating of the part with localized heating; (3) reduction in volatile organic compound emissions by accelerated curing and containment; and (4) reduction in hazardous waste by minimizing production debris through processing step management. The effect of addressing these issues is evaluated from both environmental and cost perspectives based on the assumption that the necessary technology advances can be made.
Frontiers of Engineering
This volume includes 14 papers from the National Academy of Engineering's Ninth Annual U.S. Frontiers of Engineering Symposium held in September 2003. The U.S. Frontiers meeting brings together 100 outstanding engineers (ages 30-45) to learn from their peers and discuss leading-edge technologies in a range of fields. The 2003 symposium covered these four areas: environmental engineering; fundamental limits of nanotechnology; counterterrorism technologies and infrastructure protection; and biomolecular computing. Papers in the book cover topics such as microbial mineral respiration; water-resource engineering, economics, and public policy; frontiers of silicon CMOS technology; molecular elect...
Formulation of Toughened Paste Adhesives for Reduced-Pollutant Electron Beam Repair and Assembly of Composite Structures
Historically, e-beam processed resins resulted in brittle matrix materials that were ineffective in meeting the performance demands of the military, largely because the resins lacked toughness. Toughness is a critical parameter of resins that determines the ability of the resin to absorb energy and resist crack growth under stress. The U.S. Army Research Laboratory (ARL) has developed the first high-performance adhesive paste cured by e-beam for bonding and repair of military PMC structures. This new material, ADEPO1, is a low-pollutant technology with the potential to replace mechanical fasteners and autoclave processed adhesives for repair and assembly in military applications. ADEPO1 was ...
Automotive Carbon Fiber Composites
The development of new materials that are technically and economically viable is no small endeavor. The risks, costs, and time involved in research are usually so high that only governments or private consortia can bear them. And so it has been with the trajectory of carbon fiber reinforced composites, which are capable of providing the lightweighting needed for fuel efficiency, and the mechanical strength required for safety. After a long development cycle, this material is now being widely used by the military, in commercial aircraft, and in the automotive industry. Automotive Carbon Fiber Composites: From Evolution to Implementation, written by Dr. Jackie Rehkopf, senior researcher at Pla...
SPE/ANTEC 1998 Proceedings
Annotation More than 700 presentations at ANTEC?98, the Annual Technical Conference of the Society of Plastics Engineers, comprise an encyclopedic compilation of the newest plastics technology available. This is the single most comprehensive annual presentation of new plastics technology!
