Modelling of glass fiber reinforced plastic for crash applications
Ladda ner
Typ
Examensarbete för masterexamen
Program
Applied mechanics (MPAME), MSc
Publicerad
2020
Författare
Fang, Jueyi
Gurumurthy, Chirag
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
As every automotive industry is shifting towards lightweight design, composite has
become a dominant material due to its high strength to weight ratio. However, a
good way of modelling composite materials needs to be investigated to facilitate for
the further implementation of composite structures in future designs that are crashable.
Several composites demonstrate good energy absorption character during crash
e.g. bus roll over, which is bene cial, as this contributes to a steady deceleration of
the impacting body. That is what makes it important to use composites for crash
applications.
It is complex to understand the behaviour of composites under crash condition.
Crushing of composite materials is a result of a combination of several failure mechanisms
such as matrix cracking, bre debonding, bre fracture etc.. As technology
has evolved over the years, it is now possible to mimic these failure mechanisms
using commercial FE solvers. A majority of software for reinforced polymers uses
various failure techniques and material models, so di erent approaches need to be
analysed.
This study aims to simulate the mechanical behaviour of glass- bre reinforced composite
with the suitable material model available in LS-DYNA and optimise it further
to use them in the crash simulation of buses.
Virtual simulations were performed with commercial Finite Element (FE) solver
LS-DYNA. The mechanical behaviour of two material models (*MAT 058 and
*MAT 124 ) for characterising the glass bres have been examined. Virtual simulation
test results were compared to a physical coupon test results. After a detailed
analysis, calibrated *MAT 058 material model was in good agreement with
the experimental data compared to *MAT 124.
Beskrivning
Ämne/nyckelord
Finite element method , Chopped strand mat , crash , LS-Dyna , *MAT_058 , *MAT_124 , Ls-Opt