Analiza progresivnog kolapsa trupa broda zasnovana na σ-ε krivuljama određenim pomoću nelinearne metode konačnih elemenata

master's thesis

• Title (english): Hull girder progressive collapse analysis based on σ-ε curves determined by the nonlinear finite element method
• Author: Mateja Bičak
• Mentor: Jerolim Andrić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2014-12-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Shipbuilding

Abstract

Ovaj rad obuhvaća analizu uzdužne granične čvrstoće trupa broda za prijevoz rasutog tereta sukladno inkrementalno-iterativnoj metodi propisanoj u okviru Združenih pravila za konstrukciju brodova za prijevoz rasutog tereta, Međunarodne asocijacije klasifikacijskih društava (eng. "Common Structural Rules", "International Association of Classification Societies") na razini glavnog rebra uz zamjenu propisanih σ-ε krivulja s σ-ε krivuljama određenim pomoću geometrijski i materijalno nelinearne metode konačnih elemenata. Nakon teorijskog opisa propisane metode za analizu progresivnog kolapsa, napravljena je geometrijski i materijalno nelinearna analiza svih diskretnih sastavnih elemenata konstrukcije glavnog rebra pomoću programskog paketa FEMAP/NX Nastran. Također su u obzir uzeta i inicijalna geometrijska odstupanja diskretnih elemenata (idealizirana). Dobivene σ-ε krivulje uspoređene su sa propisanim σ-ε krivuljama kako bi se odredila njihova međusobna odstupanja. σ-ε krivulje određene pomoću geometrijski i materijalno nelinearne metode konačnih elemenata su zatim implementirane unutar modula LUSA računalnog programa OCTOPUS te je provedena analiza progresivnog kolapsa trupa broda. Dobiveni rezultati graničnog momenta savijanja (za pregib i progib) uspoređeni su sa rezultatima koje daje analiza zasnovana na IACS-ovim krivuljama. Također je napravljena usporedba kolapsnih sekvenci za slučaj pregiba i za slučaj progiba trupa broda.

Abstract (english)

In this thesis hull girder ultimate longitudinal strength of a bulk carrier at its midship section was calculated using an incremental-iterative method proscribed by the International Association of Classification Societies (Common Structural Rules). Originally proscribed σ-ε curves were replaced by those calculated using the nonlinear finite element method. After the theoretical description of the proscribed method for the hull girder progressive collapse analysis of all finite elements of a midship section structure was made with the help of the program package FEMAP/NX Nastran, also taking into account the idealized initial geometrical imprefections of finite elements. The diagrams obtained in this way were compared to the proscribed σ-ε curves in order to determine any possible deviations between the two approaches. The calculated curves were then inserted into the LUSA module of the OCTOPUS program and used for the progressive collapse analysis of the main hull. The results of the ultimate bending moment (hog and sag) were compared to those calculated using IACS curves. A comparison of collapse sequences for the case of sagging and hogging of the ship’s hull was also made.

• Keywords: uzdužna granična nosivost; granični moment savijanja; progresivni kolaps; izvijanje; popuštanje; krivulje naprezanja i deformacije
• Keywords (english): Longitudinal ultimate load-capacity; ultimate bending moment; progressive collapse analysis; collapse sequence; load and shortening curves; nonlinear finite element method
• Language: croatian
• URN:NBN: urn:nbn:hr:235:155815
• Study programme: Title: Naval Architecture; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka brodogradnje (magistar/magistra inženjer/inženjerka brodogradnje)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-27 13:58:19