Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 150.00K | Year: 2014
ABSTRACT: This proposal describes an innovative approach to meeting AFRL"s goals of upgrading MEVA to address limitations in its current FRM simulation tools in order to allow it to accurately assess embedded detonations of small munitions in civil construction. The approach makes use of WAI"s coupled NLFlex/VCFD software for the HFPB computational component of this effort and leverages WAI"s wide ranging experience in using HFPB modeling to simulate the response of the full range of structural construction types to threats of interest. It also relies on WAI"s experience in developing innovative FRM tools for characterizing blast effects on concrete components including breach size and secondary debris and familiarity with the MEVA software. BENEFIT: Upon successful completion of the Phase 1 effort, WAI will have demonstrated the practicality of using the NLFlex/VCFD software to simulate complex embedded detonations problems of interest to AFRL and demonstrated its ability to provide the necessary response measures from an FRM generated from the HFPB cases. Once proven, this end-to-end approach to generating FRM response modules in MEVA will be adapted to the full range of construction and load types of interest to AFRL in a follow-on Phase II effort. The primary market for the embedded detonation blast response modules that will be developed under this project would primarily be DHS and DOD organizations in the U.S.(such as DTRA).
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 149.60K | Year: 2015
ABSTRACT:This proposal describes an approach to meeting AFRLs goals of upgrading MEVA to accurately assess the cumulative damage effects of Multi-Hit targeting scenarios. The approach makes use of WAIs coupled NLFlex/VCFD software for the HFPB computational component of this effort and leverages WAIs wide ranging experience in using HFPB modeling to simulate the response of the full range of structural construction types to threats of interest. It also relies on WAIs experience in developing innovative FRM tools for evaluating blast effects of concrete components including breach and secondary debris and familiarity with the MEVA software.BENEFIT:The primary benefit of this R&D will be the extension of MEVA to address multi-strike attacks on high strength RC bunkers. The primary market for the cumulative damage blast response modules developed under this project would be DOD organizations in the U.S. For example, DTRA develops and maintains the IMEA software for offensive targeting needs and VAPO for terrorist threats to civil construction. The new modules have potential application to both VAPO and IMEA. A previous example of this type of commercialization synergy was the Multi-hit Progressive Collapse (MPC) FRM developed by WAI under AFRL funding for inclusion within the MEVA software. At a later date, WAI received funding from DTRA to extend the steel connection modeling capabilities of MPC. Once this extension was completed, DTRA funded WAI to incorporate MPC within DTRAs VAPO software. And more recently, the Department of Homeland Security funded WAI to incorporate MPC capability within its UrbanBlast software. UrbanBlast is a FRM tool developed under funding from DHS for quantifying blast pressure fields and structural damage (including collapse) resulting from vehicle borne threats in urban settings.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 149.92K | Year: 2015
ABSTRACT:The main objective of the proposed work is to develop and implement a Multiscale-Multiphysics analysis tool for design, development and analysis CMC components. The multiscale-multiphysics analysis methodology will effectively capture the complex multi-axial stress states in SiC-SiC based CMC sub-elements and components under relevant operating conditions. The unique features of the Multiscale-Multiphysics analysis tool are as enumerated below: Ability to model inherent heterogeneities including manufacturing defects that exist at the microscale and upscale their effect on the response at the structural scale Micromechanics models at the fine scale of interest to characterize damage and failure in the CMC constituent phases Coupled multiphysics based models to determine the environmental degradation of mechanical properties due to oxygen embrittlement at elevated temperatures A temporal-multiscale approach based fatigue life prediction model Material calibration module to characterize properties of the fine scale constituents Model reduction techniques for robustness and computation efficiency The deliverable will be in the form of a plugin for Abaqus or any other commercial finite element (FE) package used by OEMs. The software tool is envisaged to facilitate OEMs in testing of new designs and offer tremendous savings in cost and time during the development process prior to full scale component testing. BENEFIT:The current thrust areas for technology development in CMCs include small component fabrication, ceramic joining and integration, material and component testing and characterization and design and analysis of concept components. As these manufacturing technologies mature, more and more of the metal-alloy based hot section components will be replaced by components made from CMCs. And as the applications of CMCs grow, the market for failure and fatigue life prediction technologies is also expected to grow significantly. The proposed comprehensive analysis tool will not only allow for strength and life prediction of CMC sub-elements and components, but also create a general framework for future development. The features of the spatial-multiscale approach allows microstructural details including imperfections to be taken into account. The multiphysics aspect incorporates constitutive relations to model coupled physical phenomena occurring at the microstructural length scale. The temporal multiscale feature allows the physical phenomena of cyclic loading and the resulting damage progression to be resolved under disparate time scales. These fundamental features of the proposed approach are essential in the softwares ability to reliably and accuracy predict the response of CMC components. The tool will assist OEMs in characterizing CMC material properties based on coupon testing and then use these validated models in component testing. The tool is also envisaged to promote design, development and testing of concept components and offer tremendous savings in cost and time. The technology developed under this SBIR project, has the potential to generate numerous opportunities for commercialization. Through direct cooperation with prospective OEMs and AFRL, we will initiate the commercialization process through technology insertion into this initial group of highly-motivated end-users. In addition, implementation of the tool as an Abaqus plugin provides access to a Simulias customer base which includes a number of aerospace, mechanical, civil, offshore, shipbuilding and transportation industries. Our strategic partnership with Simulia increases the opportunity of commercialization of the technology proposed here.
Weidlinger Associates, Inc. | Date: 2015-04-20
A pulse detonation engine including one or more fuel injectors comprising one or more piezoelectric driving stacks wherein a flow control member of each injector is driven directly by the one or more piezoelectric stacks without additional amplification means or interposing elements while a flow area of the nozzle is variably adjustable to deliver controlled flow rates in a desired flow profile to improve engine performance and reduce emissions. The pulse detonation engine configured to support variable mission and operational requirements including delivery of required thrust using specific fuel types and with power and performance of the pulse detonation engine variably adaptable. The fuel injectors associated with the pulse detonation engine configure to deliver specified flow rates with minimal linear movement of the flow control member. The injector and drive electronics configured to deliver higher frequency operation and response with increased operational stability.
Weidlinger Associates, Inc. | Date: 2015-02-19
An injector comprising one or more piezoelectric driving stacks wherein a flow control member of the injector is driven directly by the one or more piezoelectric stacks without additional amplification means or interposing elements while a flow area of the nozzle is variably adjustable to deliver controlled flow rates in a desired flow profile to improve engine performance and reduce emissions. The injector is configured to support required flow rates with minimal linear movement of the flow control member. The injector and drive electronics are configured to deliver higher frequency operation and response with increased operational stability due to minimal response lag.