[
    {
        "id": "authors:65gkp-2tw70",
        "collection": "authors",
        "collection_id": "65gkp-2tw70",
        "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121217-083339906",
        "type": "article",
        "title": "In situ mechanical characterization during deformation of PVC\n polymeric foams using ultrasonics and digital image correlation",
        "author": [
            {
                "family_name": "Kidd",
                "given_name": "T. H.",
                "clpid": "Kidd-T-H"
            },
            {
                "family_name": "Ravichandran",
                "given_name": "G.",
                "orcid": "0000-0002-2912-0001",
                "clpid": "Ravichandran-G"
            },
            {
                "family_name": "Zhuang",
                "given_name": "S.",
                "clpid": "Zhuang-S"
            }
        ],
        "abstract": "Cellular solids such as polymeric foams are finding increasing applications including its use as a core material for sandwich structures. In this study, a novel method is used to measure both the longitudinal and shear wave speeds of a material simultaneously while applying a compressive load in four different densities of polymeric foams made from the same base polymer, polyvinyl chloride (PVC). The study showed that there was a significant difference in evolution of the wave speeds and hence in the apparent modulus during deformation of the lower density foams in comparison to the higher density foams. The non-contact full-field method of digital image correlation (DIC) is used to gain insights into the failure modes during deformation. The lower density foams undergo heterogeneous deformation and failed due to buckling of cell walls. In contrast, the higher density foams undergo nominally homogeneous deformation due to plastic collapse. The failure mode transition is shown to be governed by the relative density of the foams and the mechanical properties of the polymer.",
        "doi": "10.1016/j.mechmat.2012.08.001",
        "issn": "0167-6636",
        "publisher": "Elsevier",
        "publication": "Mechanics of Materials",
        "publication_date": "2012-12",
        "volume": "55",
        "pages": "82-88"
    },
    {
        "id": "authors:8rtm1-fmt04",
        "collection": "authors",
        "collection_id": "8rtm1-fmt04",
        "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101025-125158610",
        "type": "article",
        "title": "Upstream jetting phenomenon in planar shock wave experiments with ceramic powders",
        "author": [
            {
                "family_name": "Gu",
                "given_name": "Y. B.",
                "clpid": "Gu-Y-B"
            },
            {
                "family_name": "Zhuang",
                "given_name": "S.",
                "clpid": "Zhuang-S"
            },
            {
                "family_name": "Vural",
                "given_name": "M.",
                "clpid": "Vural-M"
            },
            {
                "family_name": "Molinari",
                "given_name": "A.",
                "clpid": "Molinari-A"
            },
            {
                "family_name": "Ravichandran",
                "given_name": "G.",
                "orcid": "0000-0002-2912-0001",
                "clpid": "Ravichandran-G"
            }
        ],
        "abstract": "Jetting along upstream impact direction was observed in the experiments that were designed to study the response of ceramic powder materials to planar shock loading generated by impact. The jet formed catastrophically above certain impact stress level at the center of the impacted area and perforated upstream metal cover and flyer plates. Experiments were conducted with different impact stress levels, powder particle sizes, and geometrical parameters. Consistently repeatable results were obtained and effects arising from particle size, initial porosity, impact stress, and reflected wave were assessed. A simple mechanism-based model is used to explain the formation of the jet and estimate the jet velocity.",
        "doi": "10.1007/s00193-010-0268-9",
        "issn": "0938-1287",
        "publisher": "Springer",
        "publication": "Shock Waves",
        "publication_date": "2010-10",
        "series_number": "5",
        "volume": "20",
        "issue": "5",
        "pages": "387-393"
    },
    {
        "id": "authors:fhffm-wbw51",
        "collection": "authors",
        "collection_id": "fhffm-wbw51",
        "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150226-154819567",
        "type": "article",
        "title": "Experimental Determination of Dynamic Crack Initiation and Propagation Fracture Toughness in Thin Aluminum Sheets",
        "author": [
            {
                "family_name": "Owen",
                "given_name": "D. M.",
                "clpid": "Owen-D-M"
            },
            {
                "family_name": "Zhuang",
                "given_name": "S.",
                "clpid": "Zhuang-S"
            },
            {
                "family_name": "Rosakis",
                "given_name": "A. J.",
                "orcid": "0000-0003-0559-0794",
                "clpid": "Rosakis-A-J"
            },
            {
                "family_name": "Ravichandran",
                "given_name": "G.",
                "orcid": "0000-0002-2912-0001",
                "clpid": "Ravichandran-G"
            }
        ],
        "abstract": "An experimental investigation was undertaken to characterize the dynamic fracture characteristics of 2024-T3 aluminum thin sheets ranging in thickness from 1.63\u20132.54 mm. Specifically, the critical dynamic stress intensity factor K^d_c was determined over a wide range of loading rates (expressed as the time rate of change of the stress intensity factor K^d_I) using both a servo-hydraulic loading frame and a split Hopkinson bar in tension. In addition, the dynamic crack propagation toughness, K_D, was measured as a function of crack tip speed using high sensitivity strain gages. A dramatic increase in both K^d_c and K_D was observed with increasing loading rate and crack tip speed, respectively. These relations were found to be independent of specimen thickness over the range of 1.5 to 2.5 mm.",
        "doi": "10.1023/A:1007439301360",
        "issn": "0376-9429",
        "publisher": "Kluwer Academic",
        "publication": "International Journal of Fracture",
        "publication_date": "1998",
        "series_number": "1-2",
        "volume": "90",
        "issue": "1-2",
        "pages": "153-174"
    }
]