Analytical Strength Assessment Sintered Steel | Print

Analytical Strength Assessment of Components Made of Sintered Steels
1st Edition 2024
46 Seiten

Currently, the guideline applies exclusively to the P & S route, which pertains to sintered steels produced from relatively coarse powders and that currently consumes the largest amount of world-wide produced powder. These powders exhibit limited shrinkage and result in materials with a certain degree of porosity, compacted and sintered without the application of pressure or external field assistance. However, there is potential for this guideline to encompass additional processes in the future. Achieving this would require significant efforts, such as expanding the defined density range and accounting for variations in pore morphology (open and closed pores, tortuosity etc.).

Contents
0 General
0.1 Scope
0.2 Technical background
0.3 Required assessments
0.4 Stresses and stress components
0.5 Material data
0.6 Safety factors
0.7 Calculation procedure  
1 Assessment of static strength
1.1 General
1.2 Acting stresses
1.3 Material properties.
1.3.1 General
1.3.2 Estimation of material properties
1.4 Design parameters
1.5 Component strength
1.6 Safety factors
1.6.1 General
1.6.2 Load factor
1.6.3 Material factor  
1.7 Assessment
1.7.1 General
1.7.2 Assessment
2 Assessment of fatigue strength
2.1 General  
2.1.1 Characteristic values of stress
2.1.1.0 General
2.1.1.1 Stress components
2.1.1.2 Stress spectrum and S-N curve
2.1.1.2.1 Parameters of the stress spectrum  
2.1.1.2.2 Parameters of the S-N curve
2.2 Material properties
2.2.0 General
2.2.1 Fully reversed reference fatigue strength
2.3 Design parameters
2.3.0 General
2.3.1 Design factors
2.3.1.1 Highly stressed volume  
2.3.1.2 Surface treatment factors
2.4 Component strength
2.4.0 General
2.4.1 Component fatigue strength
2.4.2 Mean stress evaluation
2.4.2.0 General  
2.4.2.1 Maximal amplitude assessment
2.4.2.2 Equivalent amplitude assessment
2.4.2.3 Mean stress sensitivity  
2.4.2.4 Fatigue strength diagram
2.4.2.5 Mean stress factor
2.4.2.6 Single mean stress
2.4.3 Variable amplitude fatigue strength  
2.4.3.0 General  
2.4.3.1 Evaluation of damage equivalent stress  
2.4.3.2 Limitation of maximal amplitude
2.4.3.3 S-N curve  .
2.4.3.4 Calculation for constant amplitude stress
2.4.3.5 Calculation for variable amplitude stress
2.4.3.6 S-N curve for variable amplitude loading
2.5 Safety factors
2.5.0 General
2.5.1 Components
2.5.2 Total safety factor
2.6 Assessment  
2.6.0 General
2.6.1 Degree of utilization  
3 Examples
3.1 Strength assessment of a synchronizer hub
3.1.1 Description
3.1.2 Input data
3.1.3 Assessment of static strength
3.1.4 Assessment of cyclic strength
3.2 Strength assessment of a conrod
3.2.1 Input data
3.2.2 Assessment of static strength
3.2.3 Assessment of cyclic strength
4 Database
4.1 Analytically derived fatigue strength
4.2 Raw data for deriving Eq. 2.3.1.2
4.3 Database for Haigh-diagram