Multi scale
model of the laser dieless drawing process of tubes from hardly deformable
magnesium alloys
Abstract
Micro tubes made
from magnesium alloys are used in various fields such as medical, electrical,
electro-mechanical systems and chemical industry. The proposed project is
dedicated to the physical and numerical modeling of laser dieless drawing of
micro tubes from low ductile magnesium alloys. Benefits of laser dieless
drawing in comparison with conventional drawing are the ability to draw low
formable materials and the possibility to produce variable cross-section tube.
The process of laser dieless drawing uses a controlled laser beam as a local
heat source. By controlling the parameters of the beam is possible to produce
small-diameter tubes from low-plastic alloys of magnesium. The development of
heating and deformation parameters of laser dieless drawing requires analysis
of tensile speed of the billet, parameters and the localization of heating,
etc. These factors will effect on the bulk forming of the billet, the
possibility of its damage, the mechanical properties of the tube (in macro
scale), relief of free surface and the possibility of micro cracks at grain
boundaries (meso scale).The experimental solving of this problem is difficult.
The overall aim of the project is to develop the numerical multi-scale model
which allows carrying out multi-criteria optimization of laser dieless drawing
process. The model will be implemented as a program which will use parallel and
distributed computations on high performance computers what allows quick
finding of the optimal variant of the process parameters on the basis of
simulation. Model in macro scale will predict the bulk metal forming,
temperature and damage parameters. Meso scale model will predict the presence
of defects in metal and relief of free surface. Development of a model of the
materials will be made on the basis of a number of plastometric tests of
magnesium alloys under conditions which are typical for laser die less drawing.
The project relevance regarding the aim of the Joint Call in terms of
Lightweight construction materials and Materials for electronics and energy
harvesting, laser technologies.
Project on
www.researchgate.net:
Deliverable D.1.2
Downloadable
version of the program for PC
Deliverable
D.1.1 Parameters of material models
for magnesium alloys AZ31, ZEK100, AX30, MgCa08 (in report and web page)
Microstructure
in samples after tension tests;
Distribution
of strain in sample during tensile test.
Model of
fracture along grains boundaries.