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Zhang, M., Garme, K., Burman, M. & Zhou, L. (2020). A Numerical Ice Load Prediction Model Based on Ice-Hull Collision Mechanism. Applied Sciences, 10
Open this publication in new window or tab >>A Numerical Ice Load Prediction Model Based on Ice-Hull Collision Mechanism
2020 (English)In: Applied Sciences, ISSN ISSN 2076-3417, Vol. 10Article in journal (Refereed) Published
Abstract [en]

A simplified numerical model is introduced to predict ice impact force acting on the ship hull in level ice condition. The model is based on ice-hull collision mechanisms and the essential ice breaking characteristics. The two critical ice failure modes, localized crushing and bending breaking, are addressed. An energy method is used to estimate the crushing force and the indentation displacement for different geometry schemes of ice-ship interaction. Ice bending breaking scenario is taken as a semi-infinite plate under a distributed load resting on an elastic foundation. An integrated complete ice-hull impact event is introduced with ice failure modes and breaking patterns. Impact location randomness and number of broken ice wedges are considered in order to establish a stochastic model. The analysis is validated by comparison with the model ice test of a shuttle passenger ferry performed in May 2017 for SSPA Sweden AB at Aker Arctic Technology Inc. Good agreement is achieved with appropriate parameter selection assumed from the model test and when ice bending failure is dominant. This model can be used to predict the ice impact load and creates a bridge between design parameters (ice properties and ship geometry) and structure loads.

Keywords
ice-hull interaction, level ice, ice load predication, model validation, ice model test, parametric study
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-266770 (URN)10.3390/app10020692 (DOI)
Note

QC 20200123

Available from: 2020-01-20 Created: 2020-01-20 Last updated: 2020-01-23Bibliographically approved
Zhang, M., Cheemakurthy, H., Garme, K. & Burman, M. (2019). An Analytical Model for Ice Impact Load Prediction. In: : . Paper presented at The 29th International Ocean and Polar Engineering Conference, 16-21 June, Honolulu, Hawaii, USA.
Open this publication in new window or tab >>An Analytical Model for Ice Impact Load Prediction
2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

For ships running on ice-covered waters, the ice impact load on ship structure shall be carefully considered. This paper proposes an analytical model which takes two most important ice failure modes, localized crushing and bending breaking, into consideration. The energy method is introduced to estimate the crushing force and the indentation displacement for different scenarios. Ice bending breaking scenario is simplified as a semi-infinite plate under a distributed load resting on an elastic foundation. The two ice failure modes are assumed to share the same contact area. This model is useful to predict the ice impact load and creates a bridge between design parameters (ice properties and ship geometry) and structure loads. 

Keywords
Analytical model; ice-hull interaction; crushing failure; bending failure; ice load predication; ice properties; ship geometry.
National Category
Civil Engineering Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:kth:diva-260384 (URN)978-1-880653-85-2 (ISBN)
Conference
The 29th International Ocean and Polar Engineering Conference, 16-21 June, Honolulu, Hawaii, USA
Note

QCR 20191030

Available from: 2019-09-29 Created: 2019-09-29 Last updated: 2020-01-13Bibliographically approved
Shipsha, A., Hallström, S. & Burman, M. (2019). Effect of stacking sequence and bundle waviness in quasi-isotropic NCF composites subjected to compression. Composites Part B: Engineering, 178, Article ID 107423.
Open this publication in new window or tab >>Effect of stacking sequence and bundle waviness in quasi-isotropic NCF composites subjected to compression
2019 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 178, article id 107423Article in journal (Refereed) Published
Abstract [en]

The current study is focused on the compressive strength of composite materials containing non-crimp fabric (NCF) reinforcement, and how ply stacking sequence and fibre waviness influence onset and growth of damage in such materials. Experiments reveal significant effects from stacking sequence, both on the compressive strength as such, and on the underlying failure mechanisms. The fibre waviness also has a strong influence on the strength. Fibre kinking is seen before ultimate failure for all configurations but some of them also show local delamination prior to kinking. A finite element simulation methodology is developed and used for the studied cases. It handles local variations of fibre orientations by corresponding re-orientation of stiffness matrices at element level. The simulations provide good predictions of intra- and inter-laminar failure considering both in- plane and out-of-plane fibre bundle waviness. The model is further used in a parametric study of the influence from bundle waviness on the compressive strength.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Fabrics/textiles, Strength, Finite element analysis (FEA), Mechanical testing
National Category
Composite Science and Engineering
Research subject
Aerospace Engineering
Identifiers
urn:nbn:se:kth:diva-262037 (URN)10.1016/j.compositesb.2019.107423 (DOI)000498274700006 ()2-s2.0-85072574900 (Scopus ID)
Note

QC 20191016

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2020-01-07Bibliographically approved
Rajput, M. S. (2019). Experimental and numerical study of the response to various impact energy levels for composite sandwich plates with different face thicknesses. Journal of Sandwich Structures and Materials, 1654-1682
Open this publication in new window or tab >>Experimental and numerical study of the response to various impact energy levels for composite sandwich plates with different face thicknesses
2019 (English)In: Journal of Sandwich Structures and Materials, ISSN 1099-6362, E-ISSN 1530-7972, ISSN 1099-6362, p. 1654-1682Article in journal (Refereed) Published
Abstract [en]

Composite sandwich structures find wide application in the aerospace sector thanks to their lightweight characteristics. However, composite structures are highly susceptible to low velocity impact damage and therefore thorough characterization of the impact response and damage process for the used material configurations is necessary. The present study investigates the effect of face-sheet thickness on the impact response and damage mechanisms, experimentally and numerically. A uni-directional, non-crimp fabric is used as reinforcement in the face-sheets, and a closed cell Rohacell 200 Hero polymer foam is used as core material. Low-velocity impact tests are performed in a novel instrumented drop-weight rig that is able to capture the true impact response. A range of impact energies are initially utilized in order to identify when low level damage (LLD), barely visible impact damage (BVID) and visible impact damage (VID) occur. A thorough fractography investigation is performed to characterize the impact damage using both destructive and non-destructive testing. The damage from the impacts in terms of dent depth, peak contact force, deflection and absorbed energy is measured. The results show bilinear responses in dent depth vs. impact energy and absorbed energy vs. impact energy. It is found than the BVID energy works well as an indication for the onset of excessive damage. Fractography reveals that there is a failure mode shift between the LLD and the VID energy levels, and that delaminations predominantly grow along the fiber direction and rotate in a spiral pattern through the thickness, following the laminate ply orientations. Finally, a progressive damage finite element model is developed to simulate both the impact response and the delamination extent, incorporating both intra- laminar and inter-laminar damage modes. The simulation shows good agreement with the experiments.

Keywords
Non-crimp fabric, drop-weight rig, low-velocity impact, fractography, barely visible impact damage, X-ray micro-tomography, foam core
National Category
Aerospace Engineering
Research subject
Aerospace Engineering
Identifiers
urn:nbn:se:kth:diva-262026 (URN)10.1177/1099636219837133 (DOI)000470764900003 ()
Projects
Vinnova NFFP6 DAMTISS
Funder
Vinnova, 2013-01132
Note

QC 20191024

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2020-02-19Bibliographically approved
Rajput, M. S., Burman, M., Segalini, A. & Hallström, S. (2018). Design and evaluation of a novel instrumented drop-weight rig for controlled impact testing of polymer composites. Polymer testing, 68, 446-455
Open this publication in new window or tab >>Design and evaluation of a novel instrumented drop-weight rig for controlled impact testing of polymer composites
2018 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 68, p. 446-455Article in journal (Refereed) Published
Abstract [en]

A drop-weight rig (DWR) intended to test the true impact response of laminated compositematerials is presented. The test setup is designed to prevent the transfer of unwanted mechanical noise, e.g. vibrations, into the load cell that is used to measure the load during the impact event. A novel catch mechanism preventing secondary impact is also implemented in the DWR design. A detailed evaluation is performed both in terms of the experimental modal and uncertainty analysis of the measured results from the DWR. The results demonstrate that the rig is capable of capturing the true impact response, providing highly resolved and noise-free force-time measurements where even subtle details of the impact event are visible. The rig also enables impact testing with good repeatability.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Low velocity impact, Vibration, Uncertainty analysis, Modal analysis, Free-fall
National Category
Composite Science and Engineering
Research subject
Aerospace Engineering
Identifiers
urn:nbn:se:kth:diva-228484 (URN)10.1016/j.polymertesting.2018.04.022 (DOI)000437076000053 ()2-s2.0-85047266915 (Scopus ID)
Projects
DAMTISS
Funder
VINNOVA, 2013-01132
Note

QC 20180525

Available from: 2018-05-25 Created: 2018-05-25 Last updated: 2018-11-09Bibliographically approved
Shipsha, A., Burman, M. & Ekh, J. (2018). Failure of cross-ply NCF composites under off-axis compressive loads - An experimental study and a new strength prediction model including fibre bundle waviness. Composites Part B: Engineering, 153, 49-56
Open this publication in new window or tab >>Failure of cross-ply NCF composites under off-axis compressive loads - An experimental study and a new strength prediction model including fibre bundle waviness
2018 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 153, p. 49-56Article in journal (Refereed) Published
Abstract [en]

The design of reliable and efficient mechanical joints with non-crimp fabric (NCF) composites depends on several factors but knowledge on actual loading direction and an accurate compressive strength prediction is essential. Motivated by this, the current study is focused on the compressive strength of cross-ply NCF composites and the influence of fibre orientation in relation to the loading direction. Possible influence of stacking sequence on the compressive strength is also studied. Compression tests of cross-ply NCF composite laminates that are loaded at various off-axis angles are performed and the failure mechanisms are identified. An analytical semi-laminar based model for strength prediction of NCF composite laminates loaded in compression is then suggested. The model take in- and out-of-plane bundle waviness into account. Good agreement between the proposed model and experiments is observed.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Fabrics/textiles, Strength, Analytical modelling, Mechanical testing
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-239075 (URN)10.1016/j.compositesb.2018.06.022 (DOI)000448494100048 ()2-s2.0-85050100432 (Scopus ID)
Note

QC 20181121

Available from: 2018-11-21 Created: 2018-11-21 Last updated: 2019-11-18Bibliographically approved
Zhang, M., Cheemakurthy, H., Ehlers, S., von Bock und Polach, R. U., Garme, K. & Burman, M. (2018). ICE PRESSURE PREDICTION BASED ON THE PROBABILISTIC METHOD FOR ICE-GOING VESSELS IN INLAND WATERWAYS. In: PROCEEDINGS OF THE ASME 37TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2018, VOL 8: . Paper presented at 37th ASME International Conference on Ocean, Offshore and Arctic Engineering, JUN 17-22, 2018, Madrid, SPAIN. AMER SOC MECHANICAL ENGINEERS, Article ID V008T07A038.
Open this publication in new window or tab >>ICE PRESSURE PREDICTION BASED ON THE PROBABILISTIC METHOD FOR ICE-GOING VESSELS IN INLAND WATERWAYS
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2018 (English)In: PROCEEDINGS OF THE ASME 37TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2018, VOL 8, AMER SOC MECHANICAL ENGINEERS , 2018, article id V008T07A038Conference paper, Published paper (Refereed)
Abstract [en]

With increasing need to utilize inland waterways (IWW), the design for IWW vessels gains attention both from a transport efficiency and an emission control point of view. The primarily issue is to estimate the ice pressure acting on the ship hull for inland waterways. Ice information for Lake Malaren is extracted and analysed in this work. Since the ice properties have great influence on the impact load, they are studied based on empirical formulae and are calibrated by reference data. The ice impact is then predicted for an inland water barge. Probabilistic method is selected to derive the load based on available field test data. Several parent datasets are chosen, and different design strategies are implemented to evaluate the ice impact load and investigate the influences from exposure factors. The paper finds that the design curve of alpha = 0.265a(-0.57) can be used for Lake Malaren. The approach itself introduces a possible way to investigate loads on ice affected IWW.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS, 2018
Series
Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering, ISSN 2153-4772
Keywords
IWW, ice data, ice impact load, FSICR, probabilistic method, ice load height
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-239862 (URN)10.1115/OMAE2018-77668 (DOI)000449724500038 ()2-s2.0-85055559962 (Scopus ID)978-0-7918-5129-6 (ISBN)
Conference
37th ASME International Conference on Ocean, Offshore and Arctic Engineering, JUN 17-22, 2018, Madrid, SPAIN
Note

QC 20181214

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2019-05-20Bibliographically approved
Zhang, M., Cheemakurthy, H., Ehlers, S., Polach, R. U., Garme, K. & Burman, M. (2018). Ice Pressure Prediction Based on the Probabilistic Method for Ice-Going Vessels in Inland Waterways. Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, 141(2), Article ID 021501.
Open this publication in new window or tab >>Ice Pressure Prediction Based on the Probabilistic Method for Ice-Going Vessels in Inland Waterways
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2018 (English)In: Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, ISSN 0892-7219, E-ISSN 1528-896X, Vol. 141, no 2, article id 021501Article in journal, Editorial material (Refereed) Published
Abstract [en]

With increasing need to utilize inland waterways (IWW), the design for IWW vessels gains attention both from a transport efficiency and an emission control point of view. The primarily issue is to estimate the ice pressure acting on the ship hull for inland waterways. Ice information for Lake Mälaren is extracted and analysed in this work. Since the ice properties have great influence on the impact load, they are studied based on empirical formulae and are calibrated by reference data. The ice impact is then predicted for an inland water barge. Probabilistic method is selected to derive the load based on available field test data. Several parent datasets are chosen, and different design strategies are implemented to evaluate the ice impact load and investigate the influences from exposure factors. The paper finds that the design curve of α = 0.265α-0.57 can be used for Lake Mälaren. The approach itself introduces a possible way to investigate loads on ice affected IWW.With increasing need to utilize inland waterways (IWW), the design for IWW vessels gains attention both from a transport efficiency and an emission control point of view. The primarily issue is to estimate the ice pressure acting on the ship hull for inland waterways. Ice information for Lake Mälaren is extracted and analysed in this work. Since the ice properties have great influence on the impact load, they are studied based on empirical formulae and are calibrated by reference data. The ice impact is then predicted for an inland water barge. Probabilistic method is selected to derive the load based on available field test data. Several parent datasets are chosen, and different design strategies are implemented to evaluate the ice impact load and investigate the influences from exposure factors. The paper finds that the design curve of α = 0.265α-0.57 can be used for Lake Mälaren. The approach itself introduces a possible way to investigate loads on ice affected IWW.

Keywords
Finnish-Swedish ice class regulations (FSICR), Probabilistic method, Ice properties, Ice thickness distribution, Statistical analysis, Fresh Water Ice, Extreme ice pressure, Ice Loads, Inland Waterways, Level Ice, Ship Ice impact, Arctic engineering, Marine engineering, Ships, Water, Fresh Water, Ice resistances, Swedishs, Ice
National Category
Engineering and Technology
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-239026 (URN)10.1115/1.4041015 (DOI)000461037200004 ()2-s2.0-85072172483 (Scopus ID)
Note

QCR 20181206

QC 20191016

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2020-01-13Bibliographically approved
Rajput, M. S., Burman, M. & Hallström, S. (2018). Impact resistance and damage tolerance assessment of composite sandwich materials for aircraft. In: : . Paper presented at 12th International Conference on Sandwich Structures ICSS (pp. 261-263).
Open this publication in new window or tab >>Impact resistance and damage tolerance assessment of composite sandwich materials for aircraft
2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-233462 (URN)10.5075/epfl-ICSS12-2018-261-263 (DOI)
Conference
12th International Conference on Sandwich Structures ICSS
Note

QC 20180823

Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2019-05-10Bibliographically approved
Cheemakurthy, H., Zhang, M., Garme, K., Burman, M., Ehlers, S., Franz Von Bock, R. U. & Polach, x. (2018). Statistical estimation of uncertainties associated with ship operations in fresh water ice. In: Proceedings of the International Offshore and Polar Engineering Conference: . Paper presented at 28th International Ocean and Polar Engineering Conference, ISOPE 2018, 10 June 2018 through 15 June 2018 (pp. 1608-1615). International Society of Offshore and Polar Engineers
Open this publication in new window or tab >>Statistical estimation of uncertainties associated with ship operations in fresh water ice
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2018 (English)In: Proceedings of the International Offshore and Polar Engineering Conference, International Society of Offshore and Polar Engineers , 2018, p. 1608-1615Conference paper, Published paper (Refereed)
Abstract [en]

Operational Time Window (OTW) and its confidence level are important for vessels operating in ice covered waters. This can be evaluated by quantifying all contributing factors in terms of their influence along with respective associated uncertainties. For a case study involving a barge operating in Lake Mälaren, Sweden, five criteria are evaluated, and associated uncertainties are quantified using Variation Mode and Effect Analysis (VMEA) to give individual contribution towards overall uncertainty. Ship resistance due to ice and ice loads dominated over other criteria with highest contributions to uncertainty at 28% and 72% respectively.

Place, publisher, year, edition, pages
International Society of Offshore and Polar Engineers, 2018
Keywords
Channel Ice, Confidence Interval, Effect Analysis (VMEA), Finnish-Swedish ice class regulations (FSICR), Fish Bone Method, Fresh Water Ice, Ice Loads, Inland Waterways, Level Ice, Ship Ice Resistance, Uncertainty, Variable Mode, Arctic engineering, Marine engineering, Ships, Uncertainty analysis, Water, Effect analysis, Fish bones, Fresh Water, Ice resistances, Swedishs, Ice
National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:kth:diva-236446 (URN)2-s2.0-85053436824 (Scopus ID)9781880653876 (ISBN)
Conference
28th International Ocean and Polar Engineering Conference, ISOPE 2018, 10 June 2018 through 15 June 2018
Note

QC 20181022

Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2020-01-13Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1187-4796

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