Time-dependent response of aramid-epoxy-aluminum sheet, ARALL, laminates

Conference · Sun Oct 01 00:00:00 EDT 1989 · Polymer Composites; (USA)

OSTI ID:5116110

Pindera, M J; Williams, T O; Macheret, Y ^[1]

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1. National Research Council of Canada, Industrial Materials Research Institute, Boucherville (Canada)

Selected results of an ongoing investigation aimed at characterizing the time-dependent response of an aramid-epoxy-aluminum sheet laminate, ARALL-U, and its constituents at 121 C are outlined. The paper addresses the time-dependent response of the above hybrid composite under creep loading. It is illustrated that ARALL-4 laminates may exhibit substantial creep effects at stress levels below the proportional limit. The creep response is a nonlinear function of time and the applied stress level and is primarily due to the creep characteristics of the aluminum layers. An analytical model based on the assumptions of the classical lamination theory developed to model the time-dependent response of these laminates under creep and thermal loading is shown to yield good correlation with the experimental data. It is also illustrated that the residual state of stress can influence the extent of creep. This offers the possibility of minimizing the creep effects by altering the state of residual stress with mechanical prestraining. 6 refs.

• OSTI ID: 5116110
• Report Number(s): CONF-8811301--
• Journal Information: Polymer Composites; (USA), Journal Name: Polymer Composites; (USA) Vol. 10; ISSN 0272-8397; ISSN PCOMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ANALYTICAL SOLUTION
ARAMIDS
COMPOSITE MATERIALS
CREEP
EPOXIDES
LAYERS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
RESIDUAL STRESSES
SHEETS
STRESSES
SYNTHETIC MATERIALS
THERMAL STRESSES
TIME DEPENDENCE