Investigation of the creep and micropolar creep of various materials under static and dynamic loads
Journal Article
·
· Strength of Materials
OSTI ID:56888
Creep is investigated under a uniform stress state with allowance for the micropolar creep of the following materials: Lignostone (T = 293{degrees}K), steel ON2M (T = 773{degrees}K), and an AlMgSi aluminum alloy (T = 293{degrees}K) under static and cyclic tension, i.e., at A{sub {sigma}} = {sigma}{sup a}/{sigma}{sup m} = 0, 0.25, and 0.5. It is established that for lignostone, the microstrains l{sub 11} are two orders lower than 2{epsilon}{sub 12} in torsion, and the values of 21{sub 12} are only a half order lower than {epsilon}{sub 11} in tension. The creep strain of lignostone is described using nonlinear theory of viscoelasticity. For alloys and metals under static creep, the value of l{sub ij} is two or three orders lower than {epsilon}{sub ij}. A qualitative change in microipolar creep occurs in the case of dynamic loading: When A{sub {sigma}} = 0.5, the ratio of values of fatigue creep rate 21{sub 12}/{epsilon}{sub 12} = 0.2.
- OSTI ID:
- 56888
- Journal Information:
- Strength of Materials, Journal Name: Strength of Materials Journal Issue: 12 Vol. 25; ISSN 0039-2316; ISSN SMTLB5
- Country of Publication:
- United States
- Language:
- English
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