Cumulative creep damage for unidirectional composites under step loading

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Rui Miranda Guedes (Author) FEUP

Journal

Title: Mechanics of Time-Dependent Materials

Vol. 16

Pages: 381-396

ISSN: 1385-2000

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 3 Citations

INSPEC

COMPENDEX

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-002-43K

DOI: 10.1007/s11043-012-9168-y

Abstract (EN): The creep lifetime prediction of unidirectional composite materials under step loading, based on constant loading durability diagram, is analyzed for the two-step creep loading condition. For this purpose different nonlinear cumulative-damage laws are revisited and applied to predict creep lifetime. One possible approach to accounting for damage accumulation is provided by the continuum-damage mechanics (CDM). However, the CDM lifetime expression obtained for constant loading condition presents some drawbacks. Specifically, the upper stress range is not accommodated by CDM form. A modification of CDM is proposed, forcing the CDM to capture the short-term creep failure. It is proven that this modified CDM (MCDM) does not yield the same predictions as the Linear Cumulative-damage law (Miner's law). Predictions obtained from the nonlinear cumulative-damage laws are compared against synthetic lifetime generated by a micromechanical model that simulates unidirectional composites under two-step creep loading condition. Comparable deviations from Miner's law are obtained by the nonlinear cumulative-damage laws.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16