Cyclic stiffness degradation in non-linear jackup dynamics

CYCLIC AND POST-CYCLIC STIFFNESS DEGRADATION IN SAND WITH INITIAL STATIC SHEAR STRESS

Doboku Gakkai Ronbunshu ◽

10.2208/jscej.2005.785_51 ◽

2005 ◽

pp. 51-60

Author(s):

Kazuya YASUHARA ◽

Toshiyasu UNNO ◽

Satoshi MURAKAMI ◽

Hideo KOMINE

Keyword(s):

Shear Stress ◽

Stiffness Degradation ◽

Static Shear ◽

Cyclic Stiffness

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Non-linear Analysis of Laminated Composite Plates with Multi-directional Stiffness Degradation

Journal of the Korea Academia-Industrial cooperation Society ◽

10.5762/kais.2010.11.7.2661 ◽

2010 ◽

Vol 11 (7) ◽

pp. 2661-2669

Author(s):

Sung-Cheon Han ◽

Weon-Tae Park ◽

Won-Hong Lee

Keyword(s):

Laminated Composite ◽

Composite Plates ◽

Linear Analysis ◽

Stiffness Degradation ◽

Laminated Composite Plates ◽

Non Linear ◽

Directional Stiffness

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The effect of multi-directional stiffness degradation on the non-linear analysis of composite laminates

Science and Engineering of Composite Materials ◽

10.1515/secm-2011-0103 ◽

2012 ◽

Vol 19 (2) ◽

pp. 127-137

Author(s):

Sung-Cheon Han ◽

Won-Hong Lee ◽

Weon-Tae Park

Keyword(s):

Composite Laminates ◽

Composite Structures ◽

Shear Deformation Theory ◽

Laminated Composite ◽

Shell Element ◽

Linear Analysis ◽

Matrix Cracking ◽

Stiffness Degradation ◽

Non Linear ◽

Directional Stiffness

AbstractA formulation of element-based Lagrangian 9-node shell element based modified first-order shear deformation theory is improved for non-linear behaviors of composite laminates containing matrix cracking. Using the refined ANS (assumed natural strain) shell elements either show the optimum combination of sampling points with an excellent accuracy or remove the locking phenomenon. The multi-directional stiffness degradation caused by matrix cracking, which was proposed by Duan and Yao, is conducted. Natural coordinate based higher-order transverse shear strains are used in the present shell element. Numerical examples demonstrate that the present element behaves reasonably satisfactorily either for the linear or geometrical non-linear analysis of laminated composite structures. The results of laminated composite shells with matrix cracking may be the benchmark test for the non-linear analysis of damaged composite laminates.

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Cyclic Stiffness Degradation in Nonlinear Jackup Dynamics

SPE Projects Facilities & Construction ◽

10.2118/132170-pa ◽

2010 ◽

Vol 5 (02) ◽

pp. 89-96

Author(s):

Edward T.R. Dean ◽

Rich Metters

Keyword(s):

Stiffness Degradation ◽

Cyclic Stiffness

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B. The Non-Linear Calculations for Pulsating Stars

Symposium - International Astronomical Union ◽

10.1017/s0074180900019008 ◽

1967 ◽

Vol 28 ◽

pp. 105-176

Author(s):

Robert F. Christy

Keyword(s):

Major Part ◽

Afternoon Session ◽

Discussion Session ◽

Pulsating Stars ◽

Fourth Symposium ◽

Non Linear ◽

Considerable Discussion ◽

Informal Approach ◽

Preceding Session

(Ed. note: The custom in these Symposia has been to have a summary-introductory presentation which lasts about 1 to 1.5 hours, during which discussion from the floor is minor and usually directed at technical clarification. The remainder of the session is then devoted to discussion of the whole subject, oriented around the summary-introduction. The preceding session, I-A, at Nice, followed this pattern. Christy suggested that we might experiment in his presentation with a much more informal approach, allowing considerable discussion of the points raised in the summary-introduction during its presentation, with perhaps the entire morning spent in this way, reserving the afternoon session for discussion only. At Varenna, in the Fourth Symposium, several of the summaryintroductory papers presented from the astronomical viewpoint had been so full of concepts unfamiliar to a number of the aerodynamicists-physicists present, that a major part of the following discussion session had been devoted to simply clarifying concepts and then repeating a considerable amount of what had been summarized. So, always looking for alternatives which help to increase the understanding between the different disciplines by introducing clarification of concept as expeditiously as possible, we tried Christy's suggestion. Thus you will find the pattern of the following different from that in session I-A. I am much indebted to Christy for extensive collaboration in editing the resulting combined presentation and discussion. As always, however, I have taken upon myself the responsibility for the final editing, and so all shortcomings are on my head.)

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