Capability of New High Strength ADI-Materials for Automotive Components under Crash Loading

2015 ◽  
Vol 17 (8) ◽  
pp. 1189-1196 ◽  
Author(s):  
Wolfgang Böhme ◽  
Lutz Reissig
Keyword(s):  
High Strength ◽  
Automotive Components ◽  
Crash Loading

Surface Engineering Techniques and Applications

2014 ◽  
pp. 73-101
Author(s):  
Dharam Persaud-Sharma
Keyword(s):  
Surface Engineering ◽  
Weight Ratio ◽  
High Strength ◽  
Orthopedic Implants ◽  
Strength Properties ◽  
Automotive Components ◽  
Hydroxide Film ◽  
Important Challenge ◽  
Cast Magnesium ◽  
Bone Structures

Magnesium and its alloys are a well-explored type of material with a multitude of applications ranging from biomedical prosthetics to non-biological tools such as automotive components. The use of magnesium and its alloys are highly desired for such applications mainly because magnesium is lightweight and possesses a high strength to weight ratio, which reduces the amount of energy required for the operation of an apparatus. In particular, the biomedical industry uses magnesium as orthopedic implants because of its strength properties that are similar to organic bone structures. Additionally, the highly corrosive or degrading nature of magnesium makes it suitable for degradable implants or medical devices. Cast magnesium alloys are also used as components in modern engines and automobiles, as magnesium's lightweight and high strength properties permit for faster automotive speeds, acceleration, and reduced energy consumption. Magnesium produces a quasi-passive hydroxide film that offers little to no inhibition of corrosion processes. Although the degree of film passivity can be increased through metallurgical techniques like alloying, the highly oxidizing nature of magnesium remains the single most important challenge to its widespread use. This chapter provides a detailed explanation of the most successful mechanisms used to control the corrosion of magnesium and its alloys and highlights the benefits and challenges for using them.

SPRINGBACK EFFECT OF AUTOMOTIVE LOWER ARM COMPONENT PREPARED VIA BURRING PROCESSING

2015 ◽  
Vol 75 (8) ◽  
Author(s):  
Muhamad Sani Buang ◽  
Shahrul Azam Abdullah ◽  
Juri Saedon ◽  
Hashim Abdullah
Keyword(s):  
Sheet Metal ◽  
High Strength ◽  
Forming Process ◽  
Shape Accuracy ◽  
Automotive Components ◽  
Stamping Process ◽  
Tool Profile ◽  
Stretch Flanging ◽  
Metal Forming Process ◽  
Made In

Complex components of the sheet metal forming process need to be designed with high precision and accuracy in order to prevent defects and misalignment of the end products. One of the sheet metal cool stamping process for these complex automotive components is burring which is the forming of a flange around a hole made in a piece of sheet metal. Springback is a common defect during the burring process. The aims of this paper are to investigate the springback effect and improve shape accuracy of hole burring by inner burring process of lower arm part for automotive lower arm part. The springback defects at hole burring usually happened on the inner burring process. Experimental stretch flanging for cold stamping process of inner burring process was used to investigate the reasons of springback effect around the burred hole for a lower arm part of high strength steel (HSS) sheets SPFH590. From the two designs of burring punch dies, the result shows the values of springback effect for clearance -0.15 which have a big gap at hole burring A arm and B arm diameters, are larger than clearance -0.34 which have small gap for inner burring process of lower arm part. The experimental analysis shows that springback is proportionally related to the punch-die clearance parameter of the tool profile where the springback increase as the clearance increases. 

Life Cycle Energy Analysis as a Method for Material Selection

2004 ◽  
Vol 126 (5) ◽  
pp. 798-804 ◽  
Author(s):  
Peder E. Fitch ◽  
Joyce Smith Cooper
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Energy Analysis ◽  
Material Selection ◽  
High Strength ◽  
Environmental Indicators ◽  
Steel Beams ◽  
Product Analysis ◽  
Automotive Components ◽  
Life Cycle Energy Analysis

This paper presents a method of performing Life Cycle Energy Analysis (LCEA) for the purpose of material selection. The method applies product analysis methods to the evaluation of material options for automotive components. Specifically, LCEA is used to compare material options for a bumper-reinforcing beam on a 1030 kg vehicle. In this analysis, glass fiber composites and high-strength steel beams result in the lowest life cycle energy consumption. This paper also presents a set of life cycle energy terms designed to clearly distinguish between energy consumption occurring during different phases of a product’s life cycle. In addition, this paper compares the results of the LCEA method to those of other energy analyses and demonstrates how different methods of varying thoroughness can result in different material selections. Finally, opportunities are identified for extending this type of analysis beyond both automotive components and energy consumption. In particular, this paper identifies the need to develop similar methods for other environmental indicators.

Development of 590MPa Grade Hot-Dip Galvannealed DP Steels

2015 ◽  
Vol 1095 ◽  
pp. 83-86
Author(s):  
Yin Hua Jiang ◽  
Shuang Kuang ◽  
Hua Sai Liu ◽  
Hua Xiang Teng
Keyword(s):  
Mechanical Properties ◽  
Iron Oxidation ◽  
High Strength ◽  
Continuous Annealing ◽  
Structural Part ◽  
Automotive Body ◽  
Automotive Components ◽  
Crash Safety ◽  
Cr Addition ◽  
Dp Steels

Recently, the weight reduction of automotive body and crash safety become much more important factors. In addition, the corrosion resistance must be ensured for any material used in a structural part of automotive components. In an effort to satisfy these requirements, high strength galvannealed DP steels with 590 MPa in tensile strength have been developed in Shougang. Steel chemistry with low Si was designed to reduce the iron oxidation with chemical composition (Si, Mn etc.) and to improve the wettability by liquid zinc. And the alloying elements (Cr, Mo etc.) were added to improve hardenability of sheet to obtain DP microstructure. Newly developed 590MPa grade hot dip galvannealed DP steels have good mechanical properties and hole expansibility. The results revealed the Cr addition effectively suppresses the formation of ferrite during the continuous annealing to improve the hole expansibility of steels. The galvannealing temperatures are increased to improve the hole expansibility of steels by generating the appropriate amount pearlite.

Fatigue Assessment of Tubular Automotive Components in Presence of Inhomogeneities

2004 ◽  
Author(s):  
Stefano Beretta ◽  
Herna´n Juan Desimone ◽  
Andrea Poli
Keyword(s):  
Fatigue Limit ◽  
Detrimental Effect ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Probability Of Failure ◽  
Integral Approach ◽  
Material Strength ◽  
Automotive Components ◽  
Tubular Components

Tubular automotive components, e.g. stabilizers and half shafts, are components subjected to fatigue. In order to assess fatigue behavior of such components, it is important to know both the real load conditions as well as the material strength against multi-axial fatigue. For the second point, a detrimental effect in the fatigue limit of high strength steels is given by the defects present in the component, coming from the material (such as microinclusions, microvoids, etc) or for the process (e.g. handling marks). An integral approach in order to assess fatigue limit of tubular components is proposed. The attention is focused onto planar inhomogeneities, which are the most common in tubular products, though the methodology can be extended to different defect-shapes. The method is applied together with a probabilistic model, in order to analyze the probability of failure. In particular, two different processes (in terms of inhomogeneities present in the final component) are compared, and the results allow to evaluate, for example, the admissible load for the desired (or design) level of failure probability for the component.

Fatigue Designing of High Strength Steels Components Considering Aggressive Fuel Environment and Very High Cycle Fatigue Effects

2014 ◽  
Vol 783-786 ◽  
pp. 1845-1850
Author(s):  
Stephan Issler ◽  
Manfred Bacher-Hoechst ◽  
Steffen Schmid
Keyword(s):  
High Cycle Fatigue ◽  
Fuel Injection ◽  
Fatigue Testing ◽  
High Strength Steels ◽  
High Strength ◽  
Cycle Fatigue ◽  
Fatigue Reliability ◽  
Automotive Components ◽  
Very High Cycle Fatigue ◽  
Very High

Automotive components for injection systems are subjected to load spectra with up to 1E9 load cycles during the expected service life. However, fatigue testing with such a large number of cycles using original components is extremely time-consuming and expensive. A contribution for fatigue reliability assessment is available by the application of specimen testing and the transfer of the results to components including the verification by component spot tests.In this contribution very high cycle fatigue results in laboratory air and in ethanol fuel using notched specimens of high strength stainless steel are discussed. The influence of testing frequency was studied using ultrasonic and conventional test techniques. The validation and transfer of these accelerated testing results to components is one of the main challenges for a reliable fatigue designing.KeywordsVery High Cycle Fatigue (VHCF), automotive components, fuel injection, bio-fuels, corrosion fatigue, testing concepts, fatigue design concepts

Implementation of a Constitutive Model for the Mechanical Behavior of TWIP Steels and Validation Simulations

2015 ◽  
Vol 651-653 ◽  
pp. 539-544 ◽  
Author(s):  
Andrea Erhart ◽  
André Haufe ◽  
Alexander Butz ◽  
Maksim Zapara ◽  
Dirk Helm
Keyword(s):  
Constitutive Model ◽  
Metal Forming ◽  
Twip Steel ◽  
Manganese Content ◽  
High Strength ◽  
High Manganese ◽  
Macroscopic Deformation ◽  
Twip Steels ◽  
Stress Dependent ◽  
Crash Loading

High manganese content TWinning Induced Plasticity (TWIP) steels are promising for the production of lightweight components due to their high strength combined with extreme ductility, see [1]. This paper deals with the implementation of a constitutive model for the macroscopic deformation behavior of TWIP steels under mechanical loading with the aim of simulating metal forming processes and representing the behavior of TWIP-steel components – for example under crash loading - with the Finite Element code LS-DYNA®and refers to our recently published papers: [2],[4],[5]. Within the present paper we focus on the implementation of the model formulated in [2] and its extension to stress dependent twinning effects.

Boron-Treated High Strength Structural Steels and Their Application to Automotive Components

1983 ◽  
Author(s):  
Fukukazu Nakasato ◽  
Michitaka Fujita ◽  
Kazuhiko Nishida ◽  
Hiroo Ohtani ◽  
Tetsu Ohno
Keyword(s):  
High Strength ◽  
Structural Steels ◽  
Automotive Components

Life Cycle Energy Analysis as a Method for Material Selection

2003 ◽  
Author(s):  
Peder E. Fitch ◽  
Joyce Smith Cooper
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Energy Analysis ◽  
Material Selection ◽  
High Strength ◽  
Steel Beams ◽  
Product Analysis ◽  
Glass Fiber Composites ◽  
Automotive Components ◽  
Life Cycle Energy Analysis

This paper presents a method of performing Life Cycle Energy Analysis (LCEA) for the purpose of material selection. The method applies product analysis methods to the evaluation of material options for automotive components. Specifically, LCEA is used to compare material options for a bumper-reinforcing beam on a 1030 kg vehicle. From an energy perspective, glass fiber composites and high-strength steel beams performed best. This paper also presents a set of life cycle energy terms designed to clearly distinguish between energy consumption occurring during different phases of a product’s life cycle. In addition, this paper compares the results of the LCEA method to those of other energy analyses and demonstrates how different methods of varying thoroughness can result in different material selections. Finally, opportunities are identified for extending this type of analysis beyond both automotive components and energy consumption.

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