{"project":{"acronym":"","projectId":88613,"title":"Prediction and Optimization of Truss Performance for Lightweight, Intelligent Packaging and Deployable Structures","primaryTaxonomyNodes":[{"taxonomyNodeId":10569,"taxonomyRootId":8816,"parentNodeId":10567,"level":3,"code":"TX02.1.2","title":"Electronic Packaging and Implementations","definition":"Advanced electronic packaging and implementations are novel methods, materials, and designs for packaging and integrating electronic circuits at the component, board, and box levels. These technologies improve mass, volume, and power of atmospheric and space vehicle avionics, and support analog and digital electronics for tolerance to both radiation and extreme temperatures.","exampleTechnologies":"Stacked or 2.5D/3D chips/packages/modules, high density interconnect technologies, chip-on-board technologies, additively manufactured electronic packaging, solderless interconnects and interposers, system-in-package, advanced passive device technologies (e.g. 3D passive arrays)","hasChildren":false,"hasInteriorContent":true}],"startTrl":2,"currentTrl":3,"endTrl":3,"benefits":"The proposed research will develop and implement computational tools to understand the effect of microstructural nonlinearities and predict and optimize the large-deformation, dynamic, inelastic macroscopic performance of complex cellular truss structures in situations relevant to NASA, e.g. impact energy absorption in sandwich cores or the deployment of lightweight foldable structures. ","description":"Recent advances in fabrication techniques have enabled the creation of large metallic, polymeric, or ceramic truss lattices with the smallest beam dimension on the micron- and nanometer-scales, which form a new class of cellular meta-materials with tunable macroscopic properties. These lattice materials, which can bridge many length scales, offer desirable mechanical properties such as high stiffness and strength while having extremely low density. However, by manipulating the arrangement and architecture of trusses, fabricable lattices have been shown to exhibit many other novel properties, including large nonlinear recoverability and large energy absorption due to the wide mechanical hysteresis produced by the buckling of truss members. Because of the above properties, microlattices are excellent candidates for applications ranging from impact absorption in sandwich cores to deployable space structures. Fabrication and testing of these multiscale structures are available, but the prediction of the response of complex trusses to large inelastic deformation, large rotations, inelasticity and failure requires accurate computational tools that severely restrict the number of truss members that can be modeled on realistic computing resources. Since these lattices span many length scales, thousands to millions of truss members need to be simulated in order to resolve the behavior of the structures at the largest and smallest scales. The inability to predict the response of these structures through simulation leads to a trial-and-error design cycle, which is extremely inefficient. The proposed research will fill the void in the design process by creating a computational tool capable of predicting the complex nonlinear response of truss lattices containing extremely large numbers of beams and nodes. The technique will borrow concepts from the traditional quasicontinuum (QC) method, which is a powerful multiscale modeling method originally designed to drastically lower the computational cost of simulating atomistic lattices through coarse graining. My research advisor, Professor Dennis Kochmann, already has a massively parallel QC code, which will be extended to TrussQC, a high-performance computational toolbox for the simulation of large trusses. We will focus on metallic and polymeric trusses with micron-sized or larger truss members whose response is sufficiently well described by a continuum representation (i.e., well above nano-scale size effects). This has been shown to even apply for nanolattices when loaded in the linear elastic regime. Although the proposed techniques are equally applicable to all scales (as long as a model for the response of individual beams and nodes is available), we focus on micro-to-macrolattices due to the scalability of current manufacturing methods. The proposed research will develop and implement computational tools to understand the effect of microstructural nonlinearities and predict and optimize the large-deformation, dynamic, inelastic macroscopic performance of complex cellular truss structures in situations relevant to NASA, e.g. impact energy absorption in sandwich cores or the deployment of lightweight foldable structures. Lastly, non-destructive sensing to assess the mechanical integrity of these periodic structures will be investigated by computationally comparing the wave attenuation profiles of damaged and undamaged lattices.","startYear":2016,"startMonth":8,"endYear":2019,"endMonth":6,"statusDescription":"Completed","principalInvestigators":[{"contactId":118300,"canUserEdit":false,"firstName":"Dennis","lastName":"Kochmann","fullName":"Dennis Kochmann","fullNameInverted":"Kochmann, Dennis","publicEmail":false,"nacontact":false}],"programDirectors":[{"contactId":84634,"canUserEdit":false,"firstName":"Claudia","lastName":"Meyer","fullName":"Claudia M Meyer","fullNameInverted":"Meyer, Claudia M","middleInitial":"M","primaryEmail":"claudia.m.meyer@nasa.gov","publicEmail":true,"nacontact":false}],"programExecutives":[{"contactId":84634,"canUserEdit":false,"firstName":"Claudia","lastName":"Meyer","fullName":"Claudia M Meyer","fullNameInverted":"Meyer, Claudia M","middleInitial":"M","primaryEmail":"claudia.m.meyer@nasa.gov","publicEmail":true,"nacontact":false}],"programManagers":[{"contactId":183514,"canUserEdit":false,"firstName":"Hung","lastName":"Nguyen","fullName":"Hung D Nguyen","fullNameInverted":"Nguyen, Hung D","middleInitial":"D","primaryEmail":"hung.d.nguyen@nasa.gov","publicEmail":true,"nacontact":false}],"projectManagers":[{"contactId":235136,"canUserEdit":false,"firstName":"John","lastName":"Steeves","fullName":"John B Steeves","fullNameInverted":"Steeves, John B","middleInitial":"B","primaryEmail":"john.b.steeves@jpl.nasa.gov","publicEmail":true,"nacontact":false}],"coInvestigators":[{"contactId":171505,"canUserEdit":false,"firstName":"Gregory","lastName":"Phlipot","fullName":"Gregory Phlipot","fullNameInverted":"Phlipot, Gregory","primaryEmail":"gregory.p.phlipot@jpl.nasa.gov","publicEmail":true,"nacontact":false}],"website":"","libraryItems":[],"transitions":[{"transitionId":75948,"projectId":88613,"transitionDate":"2019-06-01","path":"Closed Out","details":"Advances in fabrication techniques have enabled the creation of lattice metamaterials consisting of a sizeable number of truss members that have been shown to exhibit many desirable properties for aerospace applications (e.g. high stiffness- and strength-to-weight ratios, energy absorbing properties, etc.). The multiscale nature of these truss lattices pose significant challenges for predicting their mechanical response in an efficient manner. This research approaches this problem by modeling the nonlinear mechanical response of truss lattices by borrowing techniques from the quasicontinuum (QC) method – a multiscale modeling tool originally designed to significantly reduce the computational expense of atomic lattice simulations by coarse-graining and energy sampling techniques. The QC method is applied to general truss lattices in 2D and 3D to drastically reduce the cost of quasistatic and dynamic simulations of periodic truss lattices undergoing large, nonlinear deformations and failure. This computational tool enables the efficient modeling of general periodic truss lattices and can be used in the process of designing advanced truss-based metamaterials.","infoText":"Closed out","infoTextExtra":"","dateText":"June 2019"}],"responsibleMd":{"acronym":"STMD","canUserEdit":false,"city":"","external":false,"linkCount":0,"organizationId":4875,"organizationName":"Space Technology Mission Directorate","organizationType":"NASA_Mission_Directorate","naorganization":false,"organizationTypePretty":"NASA Mission Directorate"},"program":{"acronym":"STRG","active":true,"description":"
\tThe Space Technology Research Grants Program will accelerate the development of "push" technologies to support the future space science and exploration needs of NASA, other government agencies and the commercial space sector. Innovative efforts with high risk and high payoff will be encouraged. The program is composed of two competitively awarded components.
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