Publications
119 results found
Louca LA, Ali RMM, 2008, Improving the ductile behaviour of offshore topside structures under extreme loads, ENGINEERING STRUCTURES, Vol: 30, Pages: 506-521, ISSN: 0141-0296
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- Citations: 15
Mouring SE, Kobza D, Sakamoto K, et al., 2008, Buckling Response of Impact-Damaged Composite Panels, 18th International Offshore and Polar Engineering Conference (ISOPE 2008), Publisher: INTERNATIONAL SOCIETY OFFSHORE& POLAR ENGINEERS, Pages: 385-+, ISSN: 1098-6189
Fallah AS, Ali RMM, Louca LA, 2008, Analytical–numerical study of interfacial stresses in plated beams subjected to pulse loading, Engineering Structures, Vol: 30, Pages: 856 - 869-856 - 869, ISSN: 0141-0296
In strengthening an existing beam using externally bonded soffit plates, interfacial stresses play an important limiting role on the attainment of full flexural capacity of the composite system. This paper deals with spatial and temporal distributions of shear and normal interfacial stresses in a plated beam subjected to pulse loading. Interfacial stresses are related to displacement coordinates using a set of assumptions and the coupled partial differential equations in the space of these displacement coordinates have been derived by application of dynamic equilibrium, compatibility and constitutive relations. The equations have been solved numerically for the dynamic response. The results for three pulse loading cases have been compared to finite element analyses and reasonable correlation is observed. Compared to dynamic or quasi-static ranges the correlation is weaker when loading is in the impulsive range. Spatial stress distribution suggests that unlike static loading, in the case of pulse loading interfacial stresses are not necessarily concentrated at the edges.
Mouring SE, Louca LA, Johnson HE, 2007, Modeling of impact-damaged GRP panels, ISSN: 0891-0138
In the ocean engineering and marine industry, composite materials are being used more often compared to traditional materials due to their increased strength- and stiffness-to-weight ratios, corrosion resistance, ability to tailor properties, and improved stealth characteristics needed for military applications. However composite materials are not fully understood; therefore, engineers must use excessively large safety factors resulting in overly designed structures (1). In particular, one such area of needed research is impulsive loading (underwater shock, air shock, and impact). The focus of this research is to examine the effects of low-velocity impact loading on the behavior of a composite panel. Four panels were manufactured using a modified Vacuum Assisted Resin Transfer Molding (VARTM) technique. Each panel was 91.4-cm wide × 121.9-cm long × 1.9-cm thick and was made from 29 layers of 24oz. woven roving/8084 Dow Derakane vinyl ester. Impact testing was performed at the Naval Surface Warfare Center Carderock Division (NSWCCD). Comparisons of the contact force and panel deflection are made using both an energy balance model and non-linear finite element analysis (FEA).
Soleiman Fallah A, Louca LA, 2007, Pressure-impulse diagrams for elastic-plastic-hardening and softening single degree of freedom models subjected to blast loading., International Journal of Impact Engineering, Vol: 34, Pages: 823-842
Liang YH, Louca LA, 2007, Corrugated panels under dynamic loads, International Journal of Impact Engineering, Vol: 34, Pages: 1185-1201
Mouring SE, Louca LA, Johnson HE, 2007, Response of composite panels subjected to varying impact energies, 17th International Offshore and Polar Engineering Conference (ISOPE 2007), Publisher: INTERNATIONAL SOCIETY OFFSHORE& POLAR ENGINEERS, Pages: 3513-+, ISSN: 1098-6189
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- Citations: 2
Johnson HE, Louca LA, Mooring SE, 2006, Current research into modelling of shock damage to large scale composite panels, JOURNAL OF MATERIALS SCIENCE, Vol: 41, Pages: 6655-6672, ISSN: 0022-2461
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- Citations: 7
Liang YH, Louca LA, Hobbs RE, 2006, A simplified method in the static plastic analysis of corrugated steel panels, JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN, Vol: 41, Pages: 135-149, ISSN: 0309-3247
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- Citations: 4
Louca LA, Mouring SE, 2006, Impact tests on VARTM fabricated woven roving vinyl ester laminates, 16th International Offshore and Polar Engineering Conference (ISOPE 2006), Publisher: INTERNATIONAL SOCIETY OFFSHORE& POLAR ENGINEERS, Pages: 260-+, ISSN: 1098-6189
Johnson H, Louca LA, Mouring SE, 2005, Large scale testing of thick composite panels subjected to in-plane compression, Pages: 1331-1343, ISSN: 0891-0138
There is limited information on the behaviour and strength of composite panels subjected to in-plane compression, particularly for the naval industry. This study aims to find the strength to failure of large woven glass/ vinyl-ester composite panels and compare the results with finite element analyses. The tests performed were able to demonstrate the renowned sensitivity of panels to boundary conditions, which was also reflected in a parametric study carried out in Abaqus/Standard. Two dimensional stress-based failure criteria were implemented via a user-defined field (USFLD) subroutine to detect matrix and fibre damage which allowed progressive damage to be modeled.
Boh JW, Louca LA, Choo YS, 2005, Energy absorbing passive impact barrier for profiled blastwalls, International Conference on Response of Structures to Extreme Loading, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 976-995, ISSN: 0734-743X
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- Citations: 14
Boh JW, Louca LA, Choo YS, et al., 2005, Damage modelling of SCRIMP woven roving laminated beams subjected to transverse shear, COMPOSITES PART B-ENGINEERING, Vol: 36, Pages: 427-438, ISSN: 1359-8368
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- Citations: 16
Louca LA, Boh JW, Choo YS, 2004, Response of profiled barriers subject to hydrocarbon explosions, PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS, Vol: 157, Pages: 319-331, ISSN: 0965-0911
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- Citations: 6
Boh JW, Louca LA, Choo YS, 2004, Numerical assessment of explosion resistant profiled barriers, MARINE STRUCTURES, Vol: 17, Pages: 139-160, ISSN: 0951-8339
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- Citations: 15
Boh JW, Louca LA, Choo YS, 2004, Strain rate effects on the response of stainless steel corrugated firewalls subjected to hydrocarbon explosions, JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, Vol: 60, Pages: 1-29, ISSN: 0143-974X
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- Citations: 35
Louca LA, Boh JW, 2004, Analysis and design of profiled blast walls, Health and Safety Executive Report, RR146
Louca LA, Boh JW, Choo YS, 2004, Deformation and failure of profiled barriers subjected to hydrocarbon explosions, Proceedings of the Institution of Civil Engineers: Structures and Buildings, Vol: 157, Pages: 319-331
Louca LA, Boh JW, Choo YS, 2004, Response of profiled barriers subject to hydrocarbon explosions, Structures and Buildings, Vol: 157, Pages: 319-332, ISSN: 0965-0911
Boh JW, Louca LA, Choo YS, 2004, Design and numerical assessment of blast walls subjected to hydrocarbon explosions, 14th International Offshore and Polar Engineering Conference (ISOPE 2004), Publisher: INTERNATIONAL SOCIETY OFFSHORE& POLAR ENGINEERS, Pages: 497-504, ISSN: 1098-6189
Louca LA, Boh JW, Choo YS, 2004, Design and analysis of stainless steel profiled blast barriers, Journal of Constructional Steel Research, Vol: 60, Pages: 1699-1723, ISSN: 0143-974X
Walker S, Bleach R, Carney S, et al., 2003, New guidance on the design of offshore structures to resist the explosion hazard, Pages: 111-117
In 1992 Interim Guidance Notes were issued in the UK to provide guidance for the design of offshore topsides for fires and explosions. This Guidance was one consequence of the Piper Alpha Tragedy in the North Sea. Since 1992 a great deal of further research and technology has been developed in order to improve understanding of the characteristics of fires and explosions and the response of the structures and equipment to these events. In order to collate this new information in a readily useable format, the United Kingdom Offshore Operators Association (UKOOA) and the Health and Safety Executive (HSE) commissioned the MSL Consortium to update the existing Interim Guidance Notes and produce Part 1 of the new Guidance. The MSL Consortium consisted of the organisations represented by the authors with contributions from WS Atkins (Houston) and Beth Morgan Safety Solutions. The project manager was Minaz Lalani of MSL. The new Guidance is being developed in three parts. The first two parts deal with the philosophy for the avoidance and mitigation of explosions and fires respectively, which together establish the background for Part 3 which will provide detailed guidance on design practices for fire and explosion engineering. This paper describes the first document. Specific issues which are discussed include installation risk screening, nominal explosion loads, inherently safer design, hazard management, and the derivation of Design Explosion loads. This paper also describes the recommended method for explosion response assessment given in the Guidance.
Boh JW, Louca LA, Choo YS, 2003, Tearing of corrugated panel subjected to blast loading, London, Response of structures to extreme loading: proceedings of XL 2003,Toronto, Canada, 2003, Publisher: Elsevier
Walker S, Bleach R, Carney S, et al., 2003, OMAE2003-37120 new guidance on the design of offshore structures to resist the explosion hazard, Offshore mechanics and Arctic engineering; OMAE 2003. Vol 2: safety and reliability - pipeline technology, Publisher: American Society of Mechanical Engineers, Pages: 111-118
Boh JW, Louca LA, Choo YS, 2003, Force based failure modeling of corrugated panel subjected to blast loading, 13th International Offshore and Polar Engineering Conference (ISOPE-2003), Publisher: INTERNATIONAL SOCIETY OFFSHORE& POLAR ENGINEERS, Pages: 570-575, ISSN: 1098-6189
Mouring SE, Louca LA, 2003, Investigation into shock loading effects on composite structures, London, International conference on advanced marine material (RINA), London, England, Publisher: Royal Inst Naval Architects, Pages: 129-134
De Rosa V, Friis J, Louca LA, 2003, Nonlinear analysis of stainless steel corrugated panels under blast loading: a numerical study for Health and Safety Executive, Research report, RR102
Louca LA, Wadee MA, 2002, Simplified non-linear analysis of plates subjected to hydrocarbon explosions, J STRAIN ANAL ENG, Vol: 37, Pages: 301-311, ISSN: 0309-3247
An elastic Lagrangian formulation for an unstiffened plate subject to blast loading is presented. Building on a previous formulation, which accounted for membrane strains from purely out-of-plane displacement, the addition of in-plane stretching highlights the importance of membrane action. Numerical results of the resulting system of non-linear differential equations from the new model are compared with a non-linear finite element analysis package in terms of the various displacements and membrane strains, with good correlation.
Bailey P, Chynoweth S, Friis J, et al., 2002, Blast loading from gas explosions onto nearby structures, 34th offshore technology conference, Houston, USA, 2002, Publisher: Port City Press
Friis J, Louca LA, 2002, Recent studies into possible strengthening schemes for profiled blast barriers, Major hazards offshore, ERA Technology, Pages: 7-10
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