What is creep?(a) Under low sustained stress, it is tendency of some materials to get deform slowly and permanently(b) Under zero stress, it is permanent deformation(c) High lift device(d) Anti ice deviceI have been asked this question in unit test.The query is from Structures topic in portion Structures and Loads of Aircraft Design

What is creep?(a) Under low sustained stress, it is tendency of some m

1.	What is creep?(a) Under low sustained stress, it is tendency of some materials to get deform slowly and permanently(b) Under zero stress, it is permanent deformation(c) High lift device(d) Anti ice deviceI have been asked this question in unit test.The query is from Structures topic in portion Structures and Loads of Aircraft Design
Answer» Right choice is (a) Under low SUSTAINED STRESS, it is tendency of some materials to get deform slowly and permanently Easy explanation: Creep is nothing but the tendency of some materials to get deform slowly and permanently under low but sustained stress. For most of materials used in aerospace, creep is a problem at elevated temperatures. Although some titanium, PLASTICS will exhibit creep at ROOM temperatures.

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