Research Papers

Fatigue Life of Curved Panels Under Combined Loading

[+] Author and Article Information
Dhainaut Jean-Michel

Associate Professor of Mechanical Engineering
Embry Riddle Aeronautical University,
600 South Clyde Morris Blvd.,
Daytona Beach, FL 32114
e-mail: dhain460@erau.edu

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS. Manuscript received December 3, 2013; final manuscript received October 10, 2014; published online January 12, 2015. Assoc. Editor: Javier Garcia de Jalon.

J. Comput. Nonlinear Dynam 10(2), 021014 (Mar 01, 2015) (8 pages) Paper No: CND-13-1315; doi: 10.1115/1.4028802 History: Received December 03, 2013; Revised October 10, 2014; Online January 12, 2015

The nonlinear response of shallow shells subjected to combined acoustic and thermal loads is analyzed using an efficient nonlinear modal finite element (FE) formulation. The acoustic loads have non-Gaussian probabilistic characteristics and are simulated by an algorithm capable of reliably converging to a target power spectral density (PSD) function and marginal probability density function (PDF). Factors contributing to the panel structural stiffness, softening and hardening effects, and modal contribution are also investigated along with their impact on the root-mean-square responses. The Palmgren–Miner cumulative damage theory in combination with the rainflow counting (RFC) cycles methods was used to estimate the panel fatigue life. Parametric studies for cylindrical and spherical curved panels considering stacking laminations, radii of curvatures, acoustic and thermal loads are studied in detail.

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Fig. 1

Flowchart of non-Gaussian random load generation

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Fig. 2

Curve shell curved elements

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Fig. 4

Comparison of nondimensional stress versus uniform pressure

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Fig. 3

Comparison on the lamination stacking influence with SS-1 boundary conditions

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Fig. 5

Types of motions of flat panel subjected to thermal load T/Tcr = 2 and SPL's = 82, 102, and 122 dB




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