Damage estimate for plating of ships and platforms under repeated impacts

Zhu, Ling; Faulkner, D.

doi:10.1016/0951-8339(95)00018-6

Cited by 61 publications

(16 citation statements)

References 4 publications

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“…Despite several advantages of sandwich composites, a major drawback is their low resistance to impact damage. Dynamic impact on structures can occur under different scenarios, for example, tool drop during maintenance and repair, wave slamming, iceberg collisions, bird or hail strikes [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Mechanisms of Damage in Foam Core Sandwich Composites under Impact Loading and Low Temperatures

Castellanos,

Prabhakar

2021

Preprint

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Recent interest in Arctic exploration has brought new challenges concerning the mechanical behavior of lightweight materials for offshore structures. Exposure to seawater and cold temperatures are known to degrade the mechanical properties of several materials, thus, compromising the safety of personnel and structures. This study aims to investigate the low-velocity impact behavior of woven carbon/vinyl ester sandwich composites with Polyvinyl chloride (PVC) foam core at low temperatures for marine applications. The tests were performed in a drop tower impact system with an in-built environmental chamber. Impact responses, such as the contact force, displacement and absorbed energy, at four impact energies of 7.5 J, 15 J, 30 J, and 60 J were determined at four in-situ temperatures of 25 • C, 0 • C, -25 • C and -50 • C. Results showed that temperature has a significant influence on the dynamic impact behavior of sandwich composites. The sandwich composites were rendered stiff and brittle as the temperature decreased, which has a detrimental effect on their residual strength and durability. At 7.5 J at all temperatures, the samples experienced matrix cracking, fiber fracture, and delamination at the top face sheet. The samples impacted at 15 J at all temperatures experienced fiber fracture, matrix cracking, and delamination at the top facesheet and localized core crushing/fracture. At 30 J for all the temperatures, the samples exhibited perforation of the top facesheet and penetration into the core. As the temperature decreased, the penetration of the striker into the core increased. At 60 J for all temperatures, the samples experienced perforation of the top facesheet and core, and the back facesheet exhibited varying extent of damage. At -25 • C and -50 • CC, the sandwich composite samples were almost completely perforated. At all impact energies, the sandwich composites were rendered stiff and brittle as the temperature decreased, which has a detrimental effect on their residual strength and durability. KeywordsFoam Core sandwich composites • Low-velocity impact • Low temperatures • Damage mechanisms • Woven carbon/vinyl ester composites

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Section: Introductionmentioning

confidence: 99%

Elucidating the Mechanisms of Damage in Foam Core Sandwich Composites under Impact Loading and Low Temperatures

Castellanos,

Prabhakar

2021

Preprint

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“…Jones [2] conducted an analytical method for predicting plastic deformation of a rectangular plate under slamming impulse and later a theoretical research on the dynamic behavior of plate under multiple mass impacts [3]. Zhu and Faulkner [4] proposed experimental and theoretical investigations on the behavior of rectangular plate under repeated impacts of a wedge indenter and presented a simplified theoretical formula to estimate plating damages. Huang et al [5] proposed explanation of pseudoshakedown of ship plates under repeated mass impacts based on the energy criterion both experimentally and theoretically and indicated that the elastic strain energy absorption increases with that of the plastic deformation of the structure for the axially restrained ship plate subjected to repeated dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Dynamic Behavior of Circular Mild Steel Plates with Surface Cracks Subjected to Repeated Impacts in Low Temperature

Zeng

Chen

et al. 2020

Shock and Vibration

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Experimental investigations on the mechanical responses of fully clamped circular plates with prefabricated crack at room temperature and low temperature have been conducted. Initial cracks with different lengths were prefabricated by the electrical discharge machining method. Low ambient temperature was created by the liquid nitrogen in a low-temperature chamber, and a dropping hammer was dropped from the same height with a constant impact energy of 5 J to carry out the repeated impact. Experimental test results show that the prefabricated crack has a significant influence on the mechanical behavior of the thin plates. The maximum impact force decreases with increase of the crack length, and the threshold impact number until fracture decreases with increase of the crack length. It is also observed from the test results that the maximum impact force increases with decrease of the temperature, while threshold impact number until fracture and the plastic permanent deformation decreases due to the brittleness of the material in low temperature. The present investigations provide useful insight into the failure mechanism of the clamped thin plate with initial crack under low-velocity repeated impacts in low temperature, which will lead to a guideline for research and design of marine structures in the arctic area.

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“…Ships and offshore structures are subjected to repeated impacts from hard objects other than waves. 9 Each impact may cause or expand the damage in composite in the manner of matrix cracking, fiber breakages and delamination, and consequently may affect the subsequent mechanical performance of the structure. To simulate repeated impact loading Hosur et al 10 selected a certain repeat numbers of impact and various impact energies.…”

Section: Introductionmentioning

confidence: 99%

Low temperature effect on single and repeated impact behavior of woven glass-epoxy composite plates

İçten

2014

Journal of Composite Materials

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This study deals with the determination of the response of woven glass-epoxy composites to the single and repeated impact loading at room temperature and at −50℃. Single impacts were performed at various energies up to perforation took place and the characteristics such as contact force, contact duration, deflection, and absorbed energy were obtained. In addition, some low energy values were selected for the repeated impact tests. The maximum contact force and absorbed energy versus repeat numbers were given. It was found that temperature is extremely important for determining the response of the composite subjected to single and repeated impact loadings.

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Damage estimate for plating of ships and platforms under repeated impacts

Cited by 61 publications

References 4 publications

Elucidating the Mechanisms of Damage in Foam Core Sandwich Composites under Impact Loading and Low Temperatures

Elucidating the Mechanisms of Damage in Foam Core Sandwich Composites under Impact Loading and Low Temperatures

Experimental Research on Dynamic Behavior of Circular Mild Steel Plates with Surface Cracks Subjected to Repeated Impacts in Low Temperature

Low temperature effect on single and repeated impact behavior of woven glass-epoxy composite plates

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