@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    dct:description """Thin-ply composites are being considered by NASA for space exploration applications, where the suppression of microcracks could give rise to linerless cryogenic tanks.  In this proposed Phase I STTR effort, material testing coupled with health monitoring techniques will be used to quantify damage accumulation within composite materials, both standard ply thickness and of the thin-ply design.  A multi-scale physics based approach, verified with empirical data, will be used to develop a design tool capable of predicting the useable life of a composite structure subjected to cyclic loads.

A fracture mechanics based model in a multi-scale framework is proposed as a design tool for modeling thin-ply laminates. The key variable of the model, the microcracking critical energy release rate (CERR), is to be calibrated to quasi-static and fatigue testing.  Acoustic emission (AE) monitoring will be used to quantify the crack density as a function of load history. The model will be interrogated with CERRs to best match the crack density as a function of load observed during the experiments.  If the CERR is indeed a material property, the same value should exist regardless of ply thickness and fiber architecture.  The design tool will include a stand-alone program to perform this calibration of the CERR for cross-ply laminates. Additionally, a User Material (UMAT) will be written to link the microcracking model to a structural level model in a commercial finite element code.""" ;
    dct:identifier "TECHPORT_93626" ;
    dct:issued "2018-06-01"^^xsd:date ;
    dct:modified "2020-01-29"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "Mechanism Based Damage Model for Linerless Thin-Ply Composite Pressure Vessels, Phase I" ;
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            vcard:hasEmail <mailto:hq-techport@mail.nasa.gov> ] ;
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    dct:title "Mechanism Based Damage Model for Linerless Thin-Ply Composite Pressure Vessels, Phase I" ;
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    dct:title "Mechanism Based Damage Model for Linerless Thin-Ply Composite Pressure Vessels, Phase I" ;
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    dct:title "Mechanism Based Damage Model for Linerless Thin-Ply Composite Pressure Vessels, Phase I" ;
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    dct:title "Mechanism Based Damage Model for Linerless Thin-Ply Composite Pressure Vessels, Phase I" ;
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