scholarly journals Composite riser reliability under harsh environmental conditions

2018 ◽  
Author(s):  
DC Pham
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Composite Materials ◽  
Plate Theory ◽  
Laminate Plate ◽  
Simplified Model ◽  
Theoretical Investigations ◽  
Water Conditions ◽  
History Of ◽  
Classical Laminate Plate Theory

Offshore engineers are looking to explore resources further from shore and at greater depths. A number of papers have indicated that composite materials may provide benefits at these depths. However, there are only a small number of risers in-service and with no history of operation these applications require experiments and theoretical investigations to ensure the safety and increase the knowledge about how they will survive the deep-water conditions. This paper therefore investigates a simplified model for composite risers for application to reliability analysis. A static catenary model is used with classical laminate plate theory used to generate stresses in the composite. This is connected to a Monte Carlo Simulation which is used to compare composite risers in harsh and normal conditions.

Residual stress and failure analyses of polymer matrix composites considering thermal cycling and temperature effects based on classical laminate plate theory

2018 ◽  
Vol 53 (21) ◽  
pp. 3021-3032 ◽  
Author(s):  
AR Ghasemi ◽  
A Tabatabaeian ◽  
M Moradi
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Thermal Cycling ◽  
Polymer Matrix Composites ◽  
Plate Theory ◽  
Laminate Plate ◽  
Failure Behavior ◽  
Matrix Composites ◽  
Failure Index ◽  
Classical Laminate Plate Theory

The effects of temperature and thermal cycling on the residual stress and failure behavior of different polymer matrix composites have been investigated in this paper. A new algorithm within the framework of the classical laminate plate theory (CLPT) has been presented to calculate the residual stresses. The modified Tsai-Wu failure criterion has been employed to study the failure behavior of different stacking sequences. Numerical results show that the residual stress and failure index of the composites decrease with the increase of the temperature. It has also been established that thermal cycling condition leads to reduction of the residual stresses and increment of the failure index.

Composite Materials Property Determination by Rule of Mixture and Monte Carlo Simulation

2018 ◽  
Author(s):  
Gaziz Yerbolat ◽  
Shynggys Amangeldi ◽  
Md. Hazrat Ali ◽  
Nazym Badanova ◽  
Asset Ashirbeok ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Composite Materials

Experimental and Monte Carlo simulation study on potential new composite materials to moderate neutron-gamma radiation

2020 ◽  
Vol 130 ◽  
pp. 103538
Author(s):  
Bünyamin Aygün ◽  
Erdem Şakar ◽  
V.P. Singh ◽  
M.I. Sayyed ◽  
Turgay Korkut ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Composite Materials ◽  
Gamma Radiation ◽  
Simulation Study ◽  
Monte Carlo Simulation Study

Fatigue Characterization of Piezo-Active Beams in Bending

2017 ◽  
Author(s):  
Jonathan D. Degroff ◽  
Onur Bilgen
Keyword(s):  
Plate Theory ◽  
Fiber Composite ◽  
Steel Substrate ◽  
Laminate Plate ◽  
Excitation Amplitude ◽  
Harmonic Excitation ◽  
Highly Sensitive ◽  
Classical Laminate Plate Theory ◽  
Bending Response

This paper presents the fatigue characterization of piezo-active beams in bending with surface bonded Macro-Fiber Composite actuators. Three substrate materials are considered: stainless steel, aluminum, and brass. First, the bending response is quantified theoretically using the classical laminate plate theory. The theoretical bending results indicate that the beam with the steel substrate had the largest curvature, and the specimen with the aluminum had the least. Next, midpoint deflection in a simply supported configuration in response to harmonic quasi-static actuation is experimentally measured. The results from the experiments showed no evidence of degradation of actuation for up to four million cycles at the harmonic excitation amplitude of 500 V; however, the results appeared highly sensitive to temperature.

Numerical Simulations of the Rolling of a Ship in a Stochastic Sea: Evaluations by Use of MCS and FORM

2009 ◽  
Author(s):  
Ulrik D. Nielsen ◽  
Jo̸rgen J. Jensen
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Numerical Simulations ◽  
Simplified Model ◽  
Probabilistic Assessment ◽  
Parametric Roll ◽  
First Order Reliability Method ◽  
Efficient Approach ◽  
First Order ◽  
Reliability Method

The paper elaborates on the probabilistic assessment of a simplified model for the rolling of a ship in a stochastic seaway. The model can be easily integrated with a probabilistic tool which enables evaluations of numerical simulations by the first order reliability method (FORM) and by Monte Carlo simulation (MCS). Results are presented for synchronous roll as well as parametric roll, where e.g. mean outcrossing rates have been calculated. FORM offers an efficient approach for the computations, although the approach should be applied with care in cases of parametric roll. The paper also touches on issues such as ergodicity and transient versus stationary stages in the roll realisations.

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