Ship structures

2016 ◽  
pp. 419-419
Keyword(s):  
Ship Structures

scholarly journals Corrigendum to “The measurement accuracy of instrumented ship structures under local ice loads using strain gauges” [Mar. Struct. 76 (2021) 102919]

2021 ◽  
pp. 103037
Author(s):  
Angelo Mario Böhm ◽  
Rüdiger Ulrich Franz von Bock und Polach ◽  
Hauke Herrnring ◽  
Sören Ehlers
Keyword(s):  
Measurement Accuracy ◽  
Strain Gauges ◽  
Ship Structures ◽  
Ice Loads

scholarly journals The Effect of High Glass Fiber Content and Reinforcement Combination on Pulse-Echo Ultrasonic Measurement of Composite Ship Structures

2021 ◽  
Vol 9 (4) ◽  
pp. 379
Author(s):  
Sang-Gyu Lee ◽  
Daekyun Oh ◽  
Jong Hun Woo
Keyword(s):  
Glass Fiber ◽  
Composite Laminates ◽  
Composite Structures ◽  
Ultrasonic Waves ◽  
Ship Structures ◽  
Glass Fiber Reinforced ◽  
Gfrp Composite ◽  
Chopped Strand Mat ◽  
Composite Ship ◽  
Pulse Echo

Ship structures made of glass fiber-reinforced polymer (GFRP) composite laminates are considerably thicker than aircraft and automobile structures and more likely to contain voids. The production characteristics of such composite laminates were investigated in this study by ultrasonic nondestructive evaluation (NDE). The laminate samples were produced from E-glass chopped strand mat (CSM) and woven roving (WR) fabrics with different glass fiber contents of 30–70%. Approximately 300 pulse-echo ultrasonic A-scans were performed on each sample. The laminate samples produced from only CSM tended to contain more voids compared with those produced from a combination of CSM and WR, resulting in the relative density of the former being lower than the design value, particularly for high glass fiber contents of ≥50%. The velocity of the ultrasonic waves through the CSM-only laminates was also lower for higher glass fiber contents, whereas it steadily increased for combined CSM–WR laminates. Burn-off tests of the laminates further revealed that the fabric configuration of the combined CSM–WR laminates was of higher quality, prevented the formation of voids, and improved inter-layer bonding. These findings indicate that combined CSM–WR laminates should be used to achieve more accurate ultrasonic NDE of GFRP composite structures.

Time-Variant Redundancy of Ship Structures

2011 ◽  
Vol 55 (03) ◽  
pp. 208-219 ◽  
Author(s):  
Alberto Decó ◽  
Dan M. Fragopol ◽  
Nader M. Okasha
Keyword(s):  
Bending Strength ◽  
Progressive Collapse ◽  
Probability Of Failure ◽  
Optimization Approach ◽  
Ship Structures ◽  
Hull Girder ◽  
Reliability Method ◽  
Ultimate Bending Strength ◽  
Ultimate Failure ◽  
Bending Failure

An efficient procedure for the computation of the redundancy of ship structures is presented. The changes in the redundancy due to corrosion section loss over time are also studied. Moreover, uncertainties associated with structural geometry, material properties, and loading, are accounted for. In order to calculate the redundancy index, the probability of failure of the first component and the probability of ultimate failure of the whole hull girder must be evaluated. The probability of failure is computed using a hybrid Latin Hypercube - second-order reliability method (SORM) technique. The deterministic analyses during the simulations are conducted using an optimization approach for computing the ultimate bending strength of the whole hull girder and the progressive collapse method for computing the first bending failure.

scholarly journals Impact Response of Aluminum Foam Sandwiches for Light-Weight Ship Structures

Metals ◽  
2011 ◽  
Vol 1 (1) ◽  
pp. 98-112 ◽  
Author(s):  
Vincenzo Crupi ◽  
Gabriella Epasto ◽  
Eugenio Guglielmino
Keyword(s):  
Aluminum Foam ◽  
Impact Response ◽  
Light Weight ◽  
Ship Structures

Fatigue strength improvement for ship structures by Ultrasonic Peening

2012 ◽  
Vol 17 (3) ◽  
pp. 360-369 ◽  
Author(s):  
Takanori Deguchi ◽  
Masashi Mouri ◽  
Junya Hara ◽  
Daichi Kano ◽  
Taichiro Shimoda ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Ship Structures ◽  
Ultrasonic Peening ◽  
Fatigue Strength Improvement ◽  
Strength Improvement
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