TY - RPRT TI - A Computational Framework to design 3D stiffness gradient acoustic metamaterials for impedance matching AU - Mahabadi, Rayehe Karimi [Duke University, Durham, NC (United States)] (ORCID:000000015177635X) AU - Lee, Doksoo [Northwestern University, Evanston, IL (United States)] (ORCID:0000000245976643) AU - Ogren, Alexander C. [California Institute of Technology, Pasadena, CA (United States)] (ORCID:0000000272770069) AU - Daraio, Chiara [California Institute of Technology, Pasadena, CA (United States)] (ORCID:0000000152964440) AU - Chen, Wei [Northwestern University, Evanston, IL (United States)] (ORCID:0000000246537124) AU - Rudin, Cynthia [Duke University, Durham, NC (United States)] (ORCID:0000000342832780) AU - Brinson, L. Catherine [Duke University, Durham, NC (United States)] (ORCID:0000000325511563) PY - 2025 DO - 10.1016/j.cma.2025.118571 UR - https://www.osti.gov/biblio/3005128 ID - 3005128 ER -