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Dynamic Response of Polymeric Materials Subject to Extreme Environments Under Dynamic Fracture and Impact Conditions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Dynamic Response of Polymeric Materials Subject to Extreme Environments Under Dynamic Fracture and Impact Conditions./
作者:	Chavez Morales, Rodrigo.
面頁冊數:	1 online resource (150 pages)
附註:	Source: Dissertations Abstracts International, Volume: 82-08, Section: B.
Contained By:	Dissertations Abstracts International82-08B.
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28153237click for full text (PQDT)
ISBN:	9798569916771

Dynamic Response of Polymeric Materials Subject to Extreme Environments Under Dynamic Fracture and Impact Conditions.
Chavez Morales, Rodrigo.

Dynamic Response of Polymeric Materials Subject to Extreme Environments Under Dynamic Fracture and Impact Conditions. - 1 online resource (150 pages)

Source: Dissertations Abstracts International, Volume: 82-08, Section: B.

Thesis (Ph.D.)--University of California, San Diego, 2020.

Includes bibliographical references

Polymeric materials, in particular composite materials, have seen an increase in use in naval applications. Under these conditions, structural materials need to be able to withstand dynamic loads such as those from underwater blast and wave slamming, as well as environmental factors like moisture absorption and ultraviolet radiation. Both conditions add challenges in the design process due to complex loading conditions and change in material behavior. This dissertation presents an experimental study to understand the dynamic fracture behavior of poly(methyl methacrylate) (PMMA) and carbon fiber/epoxy. Dynamic loading was obtained by launching projectiles from a gas gun onto the specimen. A combination of ultra high-speed photography and digital image correlation was used to gather full-field experimental data. First, a methodology was established using PMMA to obtain pure mode-II fracture loading conditions. This study generated valuable experimental results, which updated current data available to the fracture community. Sharp transitions from mode-II to mode-I fracture loading were observed in addition to the effect of crack-tip sharpness and loading conditions on the crack path.Next, carbon fiber/epoxy specimens were studied after developing an experimental setup capable of obtaining dynamic mode-II loading conditions. The effect of moisture absorption on the fracture behavior of unidirectional carbon fiber/epoxy samples was studied. Two different methods were used to obtain significant moisture contents, first, samples were hygrothermally aged at 65°C for 28 days and second, submersion in room temperature distilled water for 400 days. Additionally, a control group of samples with no moisture content was used to compare results. This study determined that moisture absorption decreased the fracture toughness of the material, however no differences were observed between the different aging methods.Last, unidirectional and woven carbon fiber samples were subject to mixed mode loading. The samples were hygrothermally aged at 65°C until they achieved moisture saturation. Mixed mode loading and woven composites allowed for the opportunity to create more realistic conditions compared to unidirectional composites under pure mode-II fracture. At the same time, these changes introduced complexities at the onset of crack growth. Unlike the previous experiment, the samples showed no sensitivity to moisture.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798569916771Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Carbon fiberIndex Terms--Genre/Form:

542853
Electronic books.

Dynamic Response of Polymeric Materials Subject to Extreme Environments Under Dynamic Fracture and Impact Conditions.
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