Inlämning av Examensarbete / Submission of Thesis

Rajdip Roy; Lu Qi BTH-AMT-EX--2009/D-02--SE, pp. 56. TEK/avd. för maskinteknik, 2009.

The work

Författare / Author: Rajdip Roy, Lu Qi
raidip_23@yahoo.com, luqi999@hotmail.com
Titel / Title: Stress Relaxation Study of Paper and Plastic film based Packaging Material
Abstrakt Abstract:

In this master degree thesis the time dependent deformation of packaging material is studied. Mechanical experimental tests were carried out to monitor the stress decreasing rate on paper. Several viscoelastic models were constructed using various theories and compared with the obtained experimental stress relaxation. The results showed that the modified two-unit Maxwell model suits the best to describe the relaxation behavior of the material in discussion. MATLAB was used to derive the stress relaxation equations which indicate the time dependent stress relaxation behavior of the materials for constant elongation. FE models were created by ABAQUS for analyzing the stress relaxation behavior of the paperboard and the laminate. The simulation results were then compared with the experimental results and the theoretical viscoelastic model. Additionally, specimens with a side crack were also studied.

Ämnesord / Subject: Maskinteknik - Mechanical Engineering\Structural Mechanics

Nyckelord / Keywords: Stress Relaxation, Viscoelastic Model, Elastic Modulus Relaxation, Tensile test, FE-modeling

Publication info

Dokument id / Document id:
Program:/ Programme Masters Programme in Mechanical Engineering 120 ECTS
Registreringsdatum / Date of registration: 06/18/2009
Uppsatstyp / Type of thesis: Masterarbete/Master's Thesis (120 credits)

Context

Handledare / Supervisor: Dr. Sharon Kao-Walter
skw@bth.se
Examinator / Examiner: Ansel Berghuvud
Organisation / Organisation: Blekinge Institute of Technology
Institution / School: TEK/avd. för maskinteknik
S-371 41 Karlskrona
+46 455 38 50 00
Anmärkningar / Comments:

C/O Ramendu Bhusan Roy, Avijatri-13, Jail Road, Sunamganj, 3000, Bangladesh

Files & Access

Bifogad uppsats fil(er) / Files attached: bth_amt_ex_2009d02_se.pdf (1370 kB, öppnas i nytt fönster)