Prediction of hole expansion ratio for automotive grade


Surajit Kumar Paul - Google Scholar

Prediction of hole expansion ratio for automotive grade steels.SK Paul,M Mukherjee,S Kundu,S Chandra.Computational materials science 89,189-197,2014.51 Predicting the flow behavior of metals under different strain rate and temperature through phenomenological modeling.Study on the Influence of the Springback on the Hole Paul SK,Mukherjee M,Kundu S,Chandra S (2014) Prediction of hole expansion ratio for automotive grade steels.Comput Mater Sci 89 189- 197.Chen X,Jiang H,Cui Z,Lian C,Lu C (2014) Hole expansion characteristics of ultra high strength steels.Procedia Engineering 81 718-723.Simple prediction method for the edge fracture of steel shows a schematic of the hole expanding test,while Fig.3 shows a test piece after the test.The hole expansion ratio is determined by equation (1),which represents the stretch flangeability.Hole expansion ratio = (db - do) / do x 100 (%) (1) Where,do Original hole diameter (10 mm),db Hole diameter after rupture

Saurabh Kundu - Google Scholar

Prediction of hole expansion ratio for automotive grade steels.SK Paul,M Mukherjee,S Kundu,S Chandra.Computational materials science 89,189-197,2014.51 2018.49 2018 Prediction of phase transformation and microstructure in steel using cellular automaton technique.S Kundu,M Dutta,S Ganguly,S Chandra.Scripta materialia 50 (6 Property Criteria for Automotive Al-Mg-Si Sheet AlloysA conical punch with a top angle of 60 Prediction of hole expansion ratio for automotive grade#176; was used for hole-expansion purposes,and the initial hole was made by punching using a die diameter of 10 mm (d 0).The motion of the punch into the hole was stopped manually when a crack at the edge of the expanding hole was observed.The limiting hole expansion ratio was then calculated according Previous123456NextPractical Evaluation and Prediction of Edge Cracking in Practical evaluation and accurate prediction of edge cracking are challenging issues in stamping AHSS for automotive body structures.This paper introduces a new hole-expansion testing method that could be more relevant to the edge cracking problem observed in stamping AHSS.A new testing method ado

Prediction of hole expansion ratio for various steel

Stretch-flangeability is one of important formability parameters of thin steel sheets used in the automotive industry.There have been many attempts to predict hole expansion ratio (HER),a typical term to evaluate stretch-flangeability,using uniaxial tensile properties for convenience.This paper suggests a new approach that uses total elongation and average normal anisotropy to predict HER Prediction of hole expansion ratio for various steel Stretch-flangeability is one of important formability parameters of thin steel sheets used in the automotive industry.There have been many attempts to predict hole expansion ratio (HER),a typicalPrediction of hole expansion ratio for automotive grade Request PDF On Jun 1,2014,Surajit Kumar Paul and others published Prediction of hole expansion ratio for automotive grade steels Find,read and cite all the research you need on ResearchGate

Prediction of hole expansion ratio for automotive grade

Jun 15,2014 Prediction of hole expansion ratio for automotive grade#0183;Hole expansion tests for all steel grades were carried out in accordance with ISO 16630 standards .The tests were conducted on a 60 tonne hydraulic press.A sketch of the hole expansion test is shown in Fig.1.For these tests,a 10 mm hole was punched in the centre of each 100 Prediction of hole expansion ratio for automotive grade#215; 100 mm 2 sample,as a first step.The punched hole was then Prediction of Hole Expansion Ratio for Various Steel Abstract.Stretch-flangeability is one of important formability parameters of thin steel sheets used in the automotive industry.There have been many attempts to predict hole expansion ratio (HER),a typical term to evaluate stretch-flangeability,using uniaxial tensile properties for convenience.Practical microstructure-informed dual-scale simulation Jun 01,2019 Prediction of hole expansion ratio for automotive grade#0183;From the microscopic simulation of hole expansion test,the higher hole expansion ratio could be predicted as the grain size increases and the degree of pile-up decreases.Abstract A practical dual-scale finite element model is developed to enable the formability prediction in the hole expansion of a hyper-burring steel sheet.

Practical Application of the Hole Expansion Test

Until now the hole expansion ratio has been generally regarded as a relative local formability parameter with limited application to edge-cracking analysis and prediction.In this study a constrained statistical test data analysis methodology is introduced,where the lower-bound hole expansion ratio is the basis for three practical edge Path independent limiting criteria in sheet metal forming Oct 01,2015 Prediction of hole expansion ratio for automotive grade#0183;S.K.Paul,M.Mukherjee,S.Kundu,S.ChandraPrediction of hole expansion ratio for automotive grade steels Comput Mater Sci,89 (2014),pp.189-197 Google ScholarNon-linear Correlation Between Uniaxial Tensile Properties Jul 22,2014 Prediction of hole expansion ratio for automotive grade#0183;Stretch flanging of steel sheets is an important formability issue for automobile industry.Finite element simulation study confirms that the edge of the hole deforms in a uniaxial tensile manner during the hole expansion process.To understand the effect of various tensile properties on hole expansion ratio,current experimental data and collected data from published work have been used.

News - Salzgitter Flachstahl GmbH

This ratio is determined in the hole expansion test (ISO 16630),the first step of which entails stamping a hole with an initial diameter of D 0 into a flat material sample.Subsequently,a conical stamp is driven into the hole until a crack forms across the entire thickness of the sheet.The hole expansion ratio can then be determined from the Modelling the surface roughness influence on the hole A new simulation framework is applied to quantitatively assess the surface roughness-induced influences on the edge crack sensitivity of cold rolled dualphase steel of grade DP1000.Hole expansion ratios are numerically predicted for four different edge manufacturing processes,including drilling,milling,waterjet cutting,and wire cutting.Materials and Technologies for Automotive Uselent balance between elongation and hole expansion ratio than those of the conventional steels.This is attrib-uted to the ferrite single phase microstructure and ultra-refinement of precipitates.The NANO Hiten of 780 MPa grade has already being adopted in the automotive parts such as chassis and arm parts.Moreover,since Si is not added to NANO

Materials Science Engineering A

Hole expansion ratio abstract Nanoindentation measurements were obtained on eight commercially-produced DP980 dual-phase steels to quantify the hardness of the individual constituents,ferrite and martensite,in each steel.Each microstructure was also evaluated to determine grain size,martensite volume fraction (MVF),and retained austenite M Prediction of hole expansion ratio for automotive grade#252;nstermann,S.; Wechsuwanmanee,P.; Lian,J.influences on the edge crack sensitivity of cold rolled dualphase steel of grade DP1000.Hole expansion ratios are numerically predicted for four different edge manufacturing processes,including drilling,milling,waterjet cutting,and wire cutting.The simulation framework applies the idea to make use of a ductile damage mechanics model.M Prediction of hole expansion ratio for automotive grade#252;nstermann,S.; Wechsuwanmanee,P.; Lian,J.influences on the edge crack sensitivity of cold rolled dualphase steel of grade DP1000.Hole expansion ratios are numerically predicted for four different edge manufacturing processes,including drilling,milling,waterjet cutting,and wire cutting.The simulation framework applies the idea to make use of a ductile damage mechanics model.

Key factors of stretch-flangeability of sheet materials

Prediction of hole expansion ratio for automotive grade#0183;The finite element (FE) analysis of these two-stage forming process was carried out in ls-dyna for automotive grade dual-phase (DP) and interstitial-free (IF) steels,and the -FLD and PEPS-FLD were used as damage model to predict failure.The predicted forming behaviors,such as LDH,thinning development,and the load progression,were JMMP Free Full-Text Review of Shearing Processes of The limiting hole expansion ratio is increased by punching high strength steel sheets with a double-beveling punch .An ironing process of a punched edge with a taper punch is shown in Figure 5 ,and the surfaces and cross-sections of the edges without and with ironing for the punched 980 MPa dual phase ultra-high strength steel sheet of a Increasing the Hole Expansion Ability of High Strength The purpose of this work is to increase a hole expansion ratio on the high strength steel sheet.The conventional piercing by piercing punch and piercing with a counter punch was used to make a pre-hole shearing process in this research paper.The high strength steel grade 590 and 980 MPa of 1.2 mm of thickness were used in the experiments.

IOP Conference Series Materials Science and Engineering

A new simulation framework is applied to quantitatively assess the surface roughness-induced influences on the edge crack sensitivity of cold rolled dualphase steel of grade DP1000.Hole expansion ratios are numerically predicted for four different edge manufacturing processes,including drilling,milling,waterjet cutting,and wire cutting.IOP Conference Series Materials Science and Engineering A new simulation framework is applied to quantitatively assess the surface roughness-induced influences on the edge crack sensitivity of cold rolled dualphase steel of grade DP1000.Hole expansion ratios are numerically predicted for four different edge manufacturing processes,including drilling,milling,waterjet cutting,and wire cutting.Hole Expansion of Aluminum Alloys for the Automotive The holeexpansion ratio of the two alloys are comparable at higher ageing times,whilst it is higher for AA6014 in as-quenched condition and lower ageing times.

Hole Expansion Characteristics of Ultra High Strength

Jan 01,2014 Prediction of hole expansion ratio for automotive grade#0183;For steels with relatively high hole expansion ratio,instability occurred uniformly along two directions,perpendicular to each other,45 Prediction of hole expansion ratio for automotive grade#194; Prediction of hole expansion ratio for automotive grade#176; to the hole radial direction.While the tensile strength grade was less than 590 MPa,the hole expansion ratio ofHole Expansion - an overview ScienceDirect TopicsFig.6.33 shows the relationship between the prestrain and the hole expansion ratio.The experimental results are plotted by circles.Because all the sheets were annealed,the terms parallel and perpendicular defined in Section 6.3.1 were not required.With increasing prestrain,the hole expansion ratio decreased slightly in the cases of A1050 and C1100,whereas the hole expansion High Strength Steel Sheets for Automobile Suspensionthe elongation-hole expansion ratio balance (El-).With multi-phase structures,as represented by dual-phase (DP) steels,high elongation is accompanied by the dis-advantage of a low hole-expansion ratio.Conversely,with single-phase structures such as single-phase bainite steel,the hole-expansion ratio is high,but elonga-tion is low.

Formability Assessment of Prestrained Automotive

prediction of the forming limit during the changing strain path is very challenging for both DP and IF steels for automotive body applications.In this paper,a comparative study is made for prediction of formability on DP600 (a commercial grade DP steel) and IF steel sheets by r-FLD and PEPS-FLD during the multistage forming process.Experimental artefacts on ISO 16630 hole expansion ratio The hole expansion test (HET) according to ISO 16630 standard,however,still remains the first choice for local formability issues such as cutting edge sensitivity for different materials [6].Ductile-to-brittle transition in tensile failure due to Aug 07,2018 Prediction of hole expansion ratio for automotive grade#0183;Only the precipitation-hardened steel with higher strength grade punched specimen showed a brittle fracture with extremely short fracture-elongation,whereas the other specimens showed a ductile fracture. Subscription will auto renew annually.US$ 199.This is the (2014) Prediction of hole expansion ratio for automotive grade steels

Cited by 36Publish Year 2014Author Surajit Kumar Paul,Monideepa Mukherjee,Saurabh Kundu,Sanjay ChandraPrediction of hole expansion ratio for automotive grade steels

The objective of this work is to characterize experimentally and predict analytically the hole expansion ratio of steel sheets from uniaxial tensile properties.Firstly,finite element analysis is performed to understand the deformation modes (i.e.Cited by 36Publish Year 2014Author Surajit Kumar Paul,Monideepa Mukherjee,Saurabh Kundu,Sanjay ChandraPrediction of hole expansion ratio for automotive grade Secondly,a fracture based failure criterion is employed to predict the hole expansion ratio,considering that the test stop criteria of the hole expansion process is the formation of a through thickness crack.Next,a methodology is proposed to compute the true fracture strain during uniaxial tensile test,following which a model is proposed to predict the hole expansion ratio analytically from the true fracture strain.12345NextPrediction of hole expansion ratio for various steel Stretch-flangeability is one of important formability parameters of thin steel sheets used in the automotive industry.There have been many attempts to predict hole expansion ratio (HER),a typical term to evaluate stretch-flangeability,using uniaxial tensile properties for convenience.This paper suggests a new approach that uses total elongation and average normal anisotropy to predict HER

(PDF) EXPERIMENTAL INVESTIGATION OF THE HOLE

While the tensile strength of steel is less than 700 MPa,hole expansion ratio of steel decreases linearly with the increase of tensile strength.


Top