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Randvillkorens inverkan vid stötförlopp

Eklund, Christoffer (2008) MMK920
Product Development
Abstract
The master thesis was carried out on SSAB in Oxelösund where the international steel company has its main office for cooled steels. SSAB has a world-leading position within steel where abrasion resistance and wearability is crucial. SSAB has earlier developed a computer-based model that is calibrated after real results and can simulate how strains and stresses deploy in the plates when they are exposed for strains. The model is made of solid elements and is not possible to integrate in a bigger perspective.
In order to enable a larger sector of application a similar model where a transition to scale element exists is created. This influences the feedback in the model which leads to a result that is different from the result from the... (More)
The master thesis was carried out on SSAB in Oxelösund where the international steel company has its main office for cooled steels. SSAB has a world-leading position within steel where abrasion resistance and wearability is crucial. SSAB has earlier developed a computer-based model that is calibrated after real results and can simulate how strains and stresses deploy in the plates when they are exposed for strains. The model is made of solid elements and is not possible to integrate in a bigger perspective.
In order to enable a larger sector of application a similar model where a transition to scale element exists is created. This influences the feedback in the model which leads to a result that is different from the result from the original model. The boundary conditions, character of the elements and the build-up of the model are varied until a quadrate result is received.
The developed model is used for examine how the steel's fracture weight and it´s properties are changed when the physical conditions are changed. Conditions as the geometry of the model, the shape of the impactor and the material properties of the steel are varied and its signification for the result has been determined.
In order to achieve a small deformation and a high fracture weight in for example a dumper it is very crucial how the dumper is constructed. First and foremost the material determines the result, steel has depending on the manufacturing process completely different properties and these can be adjusted for the purpose. High performance steel like HARDOX copes with considerably higher strains and obtains smaller deformations than common standard steel. The most important parameter in the structure is how far from a point of weld the impact occurs. A dumper with a frequent formation of underlying beams limits the steel´s ability to move which strongly decreases the fracture weight for the dumper. Factors as an increased thickness of the plate or a rounder shape of the impactor both increase the fracture weight of the steel. (Less)
Please use this url to cite or link to this publication:
author
Eklund, Christoffer
supervisor
organization
course
MMK920
year
type
H2 - Master's Degree (Two Years)
subject
keywords
fracture, mesh, strain, model, boundary
language
Swedish
id
1497160
date added to LUP
2009-11-04 14:43:23
date last changed
2010-02-01 14:40:04
@misc{1497160,
  abstract     = {The master thesis was carried out on SSAB in Oxelösund where the international steel company has its main office for cooled steels. SSAB has a world-leading position within steel where abrasion resistance and wearability is crucial. SSAB has earlier developed a computer-based model that is calibrated after real results and can simulate how strains and stresses deploy in the plates when they are exposed for strains. The model is made of solid elements and is not possible to integrate in a bigger perspective.
In order to enable a larger sector of application a similar model where a transition to scale element exists is created. This influences the feedback in the model which leads to a result that is different from the result from the original model. The boundary conditions, character of the elements and the build-up of the model are varied until a quadrate result is received.
The developed model is used for examine how the steel's fracture weight and it´s properties are changed when the physical conditions are changed. Conditions as the geometry of the model, the shape of the impactor and the material properties of the steel are varied and its signification for the result has been determined.
In order to achieve a small deformation and a high fracture weight in for example a dumper it is very crucial how the dumper is constructed. First and foremost the material determines the result, steel has depending on the manufacturing process completely different properties and these can be adjusted for the purpose. High performance steel like HARDOX copes with considerably higher strains and obtains smaller deformations than common standard steel. The most important parameter in the structure is how far from a point of weld the impact occurs. A dumper with a frequent formation of underlying beams limits the steel´s ability to move which strongly decreases the fracture weight for the dumper. Factors as an increased thickness of the plate or a rounder shape of the impactor both increase the fracture weight of the steel.},
  author       = {Eklund, Christoffer},
  keyword      = {fracture,mesh,strain,model,boundary},
  language     = {swe},
  note         = {Student Paper},
  title        = {Randvillkorens inverkan vid stötförlopp},
  year         = {2008},
}