Onderzoeksopdracht

Maritieme Techniek

Nr

01-027

SOC3	Sectie opdrachtgever

Ship and Offshore Structures	Naam opdrachtgever

Ir W.S. Leenders

Datum

March 2002
Titel	Behaviour of metal plates under impact
Trefwoorden

Impact, response modelling, experimental tests
Inleiding

Many structures are subjected to impact loads. Due to the efforts to use even more thin plates it becomes a quite hazardous failure mode, especially for high speed vessels. In many occasions it is not a matter of loss of aesthetics but loss of integrity of the structure which can cause loss of a ship. The type of damage we are facing in the maritime industry are different from those in other industries. Aspects as; type of mass, magnitude of the velocity, type of structures, impacted materials etc. differ in great extend to for example the automotive and aeronautical industry.

In many cases the way and type of failure is hard to understand and difficult to interpret because of the dynamic aspects. FEM models can be build to analyse these problems. Static problem can very efficiently be analysed and stress and strains can be visualized. However the simulation techniques with the aid of standard FEM techniques are often not sufficient and are in general very time consuming because of the dynamic aspect. Dynamic aspects, formulated in partial differential equations, can be well analysed with other software like Maple and/or Matlab.

This research focuses on the possibility to model impact behaviour by means of these two types of software and their interaction.

In case a proper model can be made it can be validated experimentally in the Ship Structures Laboratory.

For the ease of the research only flat metal plates will be regarded under lateral impact.
Vraagstelling	Can dynamic impact behaviour be modelled with a standard FEM program in combination with programs as Matlab/Maple?
Uitwerking en eisen

contents

Introduction with a clear statement of the problem

Results/discussion of literature research

Theoretical background of impact

FEM model of impact, sensitivity analyses

Dynamic model of impact

Developing interaction software for the total problem

Experimental validation of theoretical results

Conclusions and recommendations

Minimum recommended knowledge:

courses ‘Applied Mechanics’ (1st and 2nd year)

courses ‘dynamics’ (2nd en 3rd year)

course ‘FEM’ (3rd year)
Opmerkingen

Literature	Graduation report Henriëtte Weijs (1998)

Graduation report Martijn Hoogeland (1998)
Begeleiding

Naam	Sectie	Tel	E-mail
Wiard S. Leenders	SOC	85524	w.s.leenders@wbmt.tudelft.nl
Toegewezen aan:

Onderzoeksopdracht

Grimmelius

2002-07-16

Wim Thijs

Maritieme Techniek