Modelling deformation behaviour and fracture of a diaphragm of the gas shock tube ; Diafragmos smūginiame dujų vamzdyje deformavimo ir irimo modeliavimas

Audgur

Sujets

• Mechanical engineering

Informations

• Publié par: vilnius_gediminas_technical_university
• Publié le: 01 janvier 2008
• Nombre de lectures: 14
• Langue: English
• Poids de l'ouvrage: 2 Mo

Extrait

VILNIUS GEDIMINAS TECHNICAL UNIVERSITY
MODELLING DEFORMATION BEHAVIOUR

2007 Vilnius
Technological Sciences, Mechanical Engineering (09T)
Summary of Doctoral Dissertation
OF THE GAS SHOCK TUBE
AND FRACTURE OF A DIAPHRAGM
Jurijus TRETJAKOVAS Doctoral dissertation was prepared at Vilnius Gediminas Technical University
Prof Dr Habil Rimantas KAČIANAUSKAS (Vilnius Gediminas
Technical University, Technological Sciences, Mechanical Engineering –
Consultant
Dr Česlovas ŠIMKEVIČIUS (Semiconductor Physics Institute,
The dissertation is being defended at the Council of Scientific Field of
Prof Dr Habil Mindaugas Kazimieras LEONAVIČIUS (Vilnius
Gediminas Technical University, Technological Sciences, Mechanical
Prof Dr Habil Juozas ATKOČIŪNAS (Vilnius Gediminas Technical
Dr Habil Saulius BALEVIČIUS (Semiconductor Physics Institute,
Prof Dr Habil Rimantas BELEVIČIUS (Vilnius Gediminas Technical
Prof Dr Habil Mykolas DAUNYS (Kaunas University of Technology,
Assoc Prof Dr Žilvinas BAZARAS (Kaunas University of Technology,
Assoc Prof Dr Vytautas TURLA (Vilnius Gediminas Technical
The dissertation will be defended at the public meeting of the Council of
Scientific Field of Mechanical Enginee ring in the Senate Hall of Vilnius
oral dissertation was distributed on 19
A copy of the doctoral dissertation is avai lable for review at the Library of
Vilnius Gediminas Technical University (Saulėtekio al. 14, LT-10223 Vilnius,

© Jurijus Tretjakovas, 2007
Lithuania).
November 2007. The summary of the doct
e-mail: [e-mail]
74 4956; fax [phone]; Tel.: [phone], +370 5 2
Address: Saulėtekio al. 11, LT-10223 Vilnius, Lithuania.
Gediminas Technical University at 2 p. m. on 19 December 2007.
s, Mechanical Engineering – 09T). University, Technological Science
Technological Sciences, Mechanical Engineering – 09T),
Opponents:
Technological Sciences, Mechanical Engineering – 09T).
s, Mechanical Engineering – 09T), University, Technological Science
Physical Sciences, Physics – 02P),
s, Mechanical Engineering – 09T), University, Technological Science
Members:
Engineering – 09T).
Chairman
Mechanical Engineering at Vilnius Gediminas Technical University:
Technological Sciences, Electronics and Electrical Engineering – 01T).
09T).
Scientific Supervisor
in 2003–2007. VILNIAUS GEDIMINO TECHNIKOS UNIVERSITETAS
DEFORMAVIMO IR IRIMO MODELIAVIMAS

2007 Vilnius
Technologijos mokslai, mechanikos inžinerija (09T)
Daktaro disertacijos santrauka
DIAFRAGMOS SMŪGINIAME DUJŲ VAMZDYJE
Jurijus TRETJAKOVAS prof. habil. dr. Rimantas KAČIANAUSKAS (Vilniaus Gedimino
technikos universitetas, technologijo s mokslai, mechanikos inžinerija –
dr. Česlovas ŠIMKEVIČIUS (Puslaidininkių fizikos institutas,
Disertacija ginama Vilniaus Gedimino technikos universiteto Mechanikos
prof. habil. dr. Mindaugas Kazimieras LEONAVIČIUS
Gedimino technikos universitetas, t echnologijos mokslai, mechanikos
prof. habil. dr. Juozas ATKOČIŪNAS (Vilniaus Gedimino technikos
habil. dr. Saulius BALEVIČIUS (Puslaidininkių fizikos institutas,
prof. habil. dr. Rimantas BELEVIČIUS (Vilniaus Gedimino technikos
prof. habil. dr. Mykolas DAUNYS (Kauno technologijos universitetas,
doc. dr. Žilvinas BAZARAS (Kauno technologijos universitetas,
doc. dr. Vytautas TURLA (Vilniaus Gedimino technikos universitetas,
Disertacija bus ginama viešame Mech anikos inžinerijos mokslo krypties
tarybos posėdyje 2007 m. gruodžio 19 d. 14 val. Vilniaus Gedimino techniko s
Disertaciją galima peržiūrėti Vilnia us Gedimino technikos universitet
Disertacija
© Jurijus Tretjakovas, 2007
VGTU leidyklos „Technika“ 1431 mokslo literatūros knyga.
bibliotekoje (Saulėtekio al. 14, LT-10223 Vilnius, Lietuva).
o
nėta 2007 m. lapkričio 19 d. Disertacijos santrauka išsiunti
el. paštas [e-mail]
4956; faksas (8 5) 270 0112; Tel.: [phone], (8 5) 274
Adresas: Saulėtekio al. 11, LT-10223 Vilnius, Lietuva.
universiteto senato posėdžių salėje.
technologijos mokslai, mechanikos inžinerija – 09T).
technologijos mokslai, mechanikos inžinerija – 09T),
Oponentai:
technologijos mokslai, mechanikos inžinerija – 09T).
i, mechanikos inžinerija – 09T), universitetas, technologijos moksla
fiziniai mokslai, fizika – 02P),
i, mechanikos inžinerija – 09T), universitetas, technologijos moksla
Nariai:
inžinerija – 09T).
(Vilniaus
Pirmininkas
inžinerijos mokslo krypties taryboje:
technologijos mokslai, elektros ir elektronikos inžinerija – 01T).
Konsultantas
09T).
Mokslinis vadovas
technikos universitete. Gedimino Vilniaus metais 2003–2007 rengtaGENERAL CHARACTERISTIC OF THE DISSERTATION
Research area and topicality of the work. The gas shock tube is the most
popular device used to get shock wave s. Shock tubes are applied to various
scientific investigations in aerodynam ics and metrology. In the last decades
One of the most important functional el ements of the tube is a diaphragm;
which divides the tube in to two high and low pressure compartments. The
device is operated by rupturing the di aphragm, thus rapidly releasing the
compressed gas to flow along the tube and form a shock wave. Actually, the
most important characteristics of the shock wave depend on many factors
including the geometry of t he tube, the diaphragm design, properties of the gas
used, etc. It has been proved that the el astic-plastic fracture of the diaphragm is
the most significant factor, which determines the dynamic behaviour and
Recently, the significant progress in numerical methods and
computational technologies has provid ed a basis for solving complicated
physical problems. The progress in modellin g in last decades seems to be useful
for the development of realistic simulati on tools for simulating the fracture of
It may be stated that knowledge-based de sign of the diaphragm, relying on
Aim and tasks of the work. The main aim of the work is to describe and
investigate numerically the deformation and fracture processes of the
diaphragms, as well as investigating the influence of the incision depth on
diaphragm opening and giving recommendat ions concerning the control of the
1. To investigate experimentally the deformation and fracture of
2. To investigate numerically the de formation and fracture of the
3. To investigate the influence of the geometry of incision on deformation
5

and fracture.
diaphragms with and without incisions.
diaphragms.
To achieve this aim, the following tasks were set:
opening process.
the results of numerical simulation, is being constantly improved.
shock tube diaphragm.
characteristics of the shock wave.
edicine and other branches of science. shock tube has been used in chemistry, mResearch objects and methods. The finite element method was
elaborated to investigate numerically the nonlinear elastic – plastic deformation
behaviour and fracture of the shock tube diaphragm with cross incisions.
Scientific novelty and originality. Deformation and fracture behaviour of
the slender diaphragm with cross incisio ns is simulated by the developed finite
The influence of incisions geometry on the critical pressure of diaphragms
Theoretical and practical value. The developed computational model
serves as the basis for numerical predi ction of load capacity, deformation
behaviour, location and spreading of plastic deformation zones and for a
Based on simulation results, the reco mmendations considering diaphragm
Dissertation has been prepared at the Department of
Strength of Materials of Vilnius Gedimi nas Technical University in cooperatio n
witch High Power Pulse laboratory of Vilnius Semiconductor Physics Institute.
I am very grateful to the scientific ad visor Prof Dr Habil R. Kačianauskas and
to the consultant Assoc Prof Dr Č. Ši mkevičius and to the colleagues of the
Department of Strength of Materials and High Power Pulse laboratory for
Approbation and publications . The main results of the dissertation were
presented at 7 scientific conferences. Thr ee scientific papers were published on
the topic of dissertation. One of them wa s included in the proceedings of the
conference organized by internati onal scientific organizations (ISI
Proceedings), while the other were pu blished in the reviewed periodical
included in the databases from the li st approved by Lithuanian Scientific
The structure of the scientific work. The thesis is written in Lithuanian.
It consists of the introduction, five ch apters, conclusions and the list of
references (106 items). The dissertation comprises 88 pages, 69 pictures and 4
6
Acknowledgment.
tables.
Council in 2006.
orming the experimental research. consulting and assistance in perf
ometry may be provided. material and incisions ge
description of fracture.
with incisions were performed. Original experiments of diaphragms
was examined by applying deformation and fracture criteria.
element model.
validate the numerical results. Experiments were performed to The shock tube (Fig 1) is made of a solid smooth wall pipe of c