# LNMS

# Laboratorij za numerično modeliranje in simulacije

- RECENT R & D
- PRODUCT DEVELOPMENT
**INDUSTRIAL PROJECTS:**- New connecting method for cylindrical parts
- Transparent facade panel Qbiss-Air-Transparent
- Sea-wave Dynamic Loading of Sailing Yacht`s Retractable Keel
- A development of "Easy-Open-End" (EOE) technology
- Installation effects in Coriolis flowmeters
- Numerical simulation of progressive stamping process
- Qbiss-Air facade panel
- Analysis of the spherical needle valve
- Analysis of the Reitz fan
- A development of a clipping mechanism rings
- Analysis of the casing and blades of hydroelectric power plants
- Analysis stator bolts in hydroelectric power plants
- A development of the pouring pot
- Clipping mechanism for document file
- Analysis of the cheesemaking tub
- A design of a press
- A determination of the starting sheet shape for kitchen sink
- Stress-strain analysis of the hydraulic cylinder
- Capacity of bottoms in a silo
- Analysis of the pipeline made of the EPR black rubber
- Analysis of aluminum evaporators
- Analysis of the Beli Križ antenna tower
- The container for chocolate mass
- Biological sewage container
- Tanks for liquefied propane - butane

- SHEET METAL FORMING
**INDUSTRIAL PROJECTS:**- A development of "Easy-Open-End" (EOE) technology
- Simulation of deep drawing sheet process
- Selective lubrication and holding in the deep drawing process
- The process of determining the initial sheet shape from known deformed shape
- Optimizing the shape of the initial sheet in deep drawing process
- Computer simulation of deep drawing process for gastro containers
**SCIENTIFIC RESEARCH:**- A method for optimal blank shape determination in sheet metal forming
- BBC2008 – a new yield criterion
- Analysis of the microstructure near the punching zone
- Optimal tool shape determination for sheet metal forming
- Characterization of mechanical behaviour at large strains
- A new anisotropic elasto-plastic model with elastic modulus degradation
- The evolution of effective elastic properties of a cold formed stainless steel
- Modelling of springback in sheet metal forming
- Prediction of elastic recovery of a formed steel sheet considering stiffness degradation
- Finite element simulation of sheet fine blanking process
- Strain path dependent stiffness degradation of a loaded sheet
- Impact of Young's modulus degradation on springback

- CONSTITUTIVE MODELLING
**SCIENTIFIC RESEARCH:**- Consistent tangent operator for cutting-plane algorithm (CPA)
- BBC2008 – a new yield criterion
- Additionally improved accuracy of the NICE scheme
- A new anisotropic elasto-plastic model with elastic modulus degradation
- Integration of constitutive equations with the NICE scheme
- The evolution of effective elastic properties of a cold formed stainless steel
- Improved explicit integration in plasticity
- A new integration scheme NICE for explicit FEM programs
- Modelling of springback in sheet metal forming
- Prediction of elastic recovery of a formed steel sheet considering stiffness degradation
- Strain path dependent stiffness degradation of a loaded sheet
- Impact of Young's modulus degradation on springback

- TECHNOLOGICAL PROCESSES
**INDUSTRIAL PROJECTS:**- A development of "Easy-Open-End" (EOE) technology
- Modelling of laser surface hardening
- Numerical simulation of progressive stamping process
- Simulation of die casting process
- Thermo-mechanical modelling of continuous casting primary zone
- Analysis of the casting part
- A development of a clipping mechanism rings
- A development of the production processes from thick plates
- Analysis of the mechanical response of the housing of an electromagnet
- Selective lubrication and holding in the deep drawing process
- A development of the technological process for double kitchen sink production
- Computer simulation of deep drawing process for gastro containers
- Simulation of deep drawing sheet process
- Optimization of the tools for extrusion
- Numerical analysis of steel rolling process
- Optimization of multi-step process of wire making process
- Safety ring of the tool for radial extrusion
- Numerical simulation of the ingot manufacturing process
- Numerical simulation of the rotational molding process
- Simulation of electroslag remelting
**SCIENTIFIC RESEARCH:**- Mathematical modeling of rotational molding process
- Mathematical modeling of heat treatment

- THERMOMECHANICAL ANALYSES
**INDUSTRIAL PROJECTS:**- Modelling of laser surface hardening
- Simulation of die casting process
- Thermo-mechanical analysis of the gravure plate
- Thermo-mechanical analysis of compression joints
- Thermo-mechanical modelling of continuous casting primary zone
- Analysis of the casting part
- Thermomechanical analysis of the pressure chamber
- Analysis stator bolts in hydroelectric power plants
- A possibility of the crack occurrence due to thermal loading in the NPP Krško
- A development of the pouring pot
- Mechanical state in the welding zone after rolling
- Numerical simulation of the ingot manufacturing process
- Numerical simulation of the rotational molding process
- Simulation of electroslag remelting
**SCIENTIFIC RESEARCH:**- Characterization of material parameters used in the mathematical modelling of arc welding
- Numerical simulation of stress relieving of an austenite stainless steel
- Mathematical modelling of rotary casting - thermomechanical analysis of a mould
- Mathematical modeling of thermal conditions during solidification
- Mathematical modeling of heat treatment
- Finite difference thermo-plastic stress analysis of cyclically thermally loaded problems
- Study of influence of the plastic hardening in the case of cyclic thermo-plastic problems
- Influence of phase transformation on stresses in thermal treatment of metals
- A quasi-static thermoelastic stress state in the semi-plane with sectionally continuous thermal expansion coefficient

- NUCLEAR ENGINEERING
**INDUSTRIAL PROJECTS:**- Passive ventilation system for the reactor building of the Krško NPP
- Analysis of the valve on the steam line NPP Krško
- Impact of restrained thermal expansion on NPP Krško
- About mechanical analysis of piping systems and insulation on the reactor head of the Krško NPP
- Analysis of residual stresses in the pressurizer nozzle in the Krško NPP
- Determination of safety factor according to Dang Van criterion under fatigue loads
- Analysis of the support of the fusion reactor
- Analysis of the thermal transients of the valve in NPP Krško
- A low-pressure turbine of the NPP Krško
- Analysis of the primary piping loop in the NPP Krško
- A possibility of the crack occurrence due to thermal loading in the NPP Krško
- Analyzes of the primary cooling loop of the NPP Krško
- Analysis of the tubes in the steam generator of the NPP Krško
- Sleeve mounting in the steam generator tubes without welded joint in the NPP Krško
- Process parameter study of the blowing operation in the manufacture of heat exchanger pipeline systems
- Fracture mechanics analysis of the RCP casing of NPP Krško
- Safety analysis of Krško NPP steam generator tubes damaged by outside diameter stress corrosion cracking at tube support plates
- Analysis of the steam generator in the NPP Krško

- MULTIPHYSICAL PROBLEMS
**INDUSTRIAL PROJECTS:**- Installation effects in Coriolis flowmeters
- Dinamske obremenitve teleskopske kobilice jadrnice
- An improved three-dimensional coupled fluid-structure model for Coriolis flowmeters
- Coupling FEM and BEM for computationally efficient solutions of multi-physics and multi-domain problems
- Coupled finite-volume/finite-element modelling of the straight-tube Coriolis flowmeter
- Numerical simulation of wind flow around an elastic inflated membrane
- Analysis of temperature field in induction heating
- Simulation of electroslag remelting
**SCIENTIFIC RESEARCH:**- IGUcalc
- On the approximation of induction heating problem optimization

- NUMERICAL METHODS
**SCIENTIFIC RESEARCH:**- Consistent tangent operator for cutting-plane algorithm (CPA)
- Additionally improved accuracy of the NICE scheme
- Stability of the NICE scheme
- Integration of constitutive equations with the NICE scheme
- Improved explicit integration in plasticity
- A new integration scheme NICE for explicit FEM programs
- Coupling FEM and BEM for computationally efficient solutions of multi-physics and multi-domain problems
- Parallel computing with load balancing
- About finite element sensitivity analysis of elastoplastic systems at large strains
- Computer simulation
- A velocity based approach including acceleration to the finite element computation of viscoplastic problems
- A procedure for the determination of the blank shape from its deformed shape
- Numerical solution of the multibody contact problem
- The comparative analysis of applicability of bem on torsion problem
- Incremental iterative methods of stress and strain determination in the elastic-plastic range with the FEM

- OPTIMIZATION
**INDUSTRIAL PROJECTS:**- Optimization of the continuous casting mould shape
- Tool design optimization in extrusion processes
- Two-stage design optimization of shell structures
- Optimization of single and multistep wire drawing processes
- Shape optimization of the blank sheet for deep drawing
- Safety ring of the tool for radial extrusion
**SCIENTIFIC RESEARCH:**- On the approximation of induction heating problem optimization

- INVERSE IDENTIFICATION
**INDUSTRIAL PROJECTS:**- DIC measurement of owen cavity
**SCIENTIFIC RESEARCH:**- DIC - Digital Image Correlation
- Characterization of material parameters used in the mathematical modelling of arc welding
- Characterization of mechanical behaviour at large strains
- Usage of the yield curve in numerical simulations
- Identification of the yield curve of a sheet metal after onset of necking
- Identification of the moisture transport parameters in spruce wood
- Thermo-rheological characterization
- Identification of the temperature dependent material properties
- Numerical analysis of material properties of metals on the basis of cooling curves

- BIOMECHANICS
**SCIENTIFIC RESEARCH:**- Applying thermomechanical analogy to predict the arterial residual stress state
- Modelling of the mechanical response of the carotid artery

- THEORETICAL MECHANICS
**SCIENTIFIC RESEARCH:**- Analytical solutions in elasto-plasto bending of beams with rectangular cross section
- Analytical tracing of the evolution of the elasto-plastic state during the bending of beams
- Two approaches to convected frames in solid analysis in finite deformations
- On the influence of the loads, acting parallel to the crack surface
- Solving of the contact frictional problem
- Parametric analysis in the field of fracture mechanics
- Using real and complex analysis in classical and visco-elastomechanics
- Contact Problems in the Large Displacement Beam Theory
- Modelling of a rolling contact problem with the viscoelastic material response included
- Contact problems in viscoelastic materials
- Bending boundary problems of an infinite plate with cuts
- Determination of the stress-strain state in two-fold connected plates
- Solution of boundary problems of theory of elasticity by means of Lauricella-Šerman integral equation
- Solution of plate bending problem by BEM
- Bending of thin uniaxial curved elements with inconstant rigidity and big displacements