Research

FKM 1994 Booklet No. 185 Project No. 167 Abstract: The research project was concerned with the experimental and theoretical analysis and optimization of the deep rolling finishing process, which serves to increase the fatigue strength of metallic components. Approximately 900 round samples of 42 CrMo 4 heat-treatable steel, GGG.60 nodular graphite cast iron and 38 MnVS 5 AFP...

FKM 1994 Booklet No. 186 Project No. 134 Abstract: In the project 'Computer-aided fatigue strength assessment' of the Forschungskuratorium Maschinenbau, a computer program was developed to support experts who assess fatigue strength. The program is intended to help speed up the development of new products by using numerical methods for fatigue strength analysis and to...

FKM 1994 Issue No. 187 Project No. 166 Abstract: The lead time of customer orders has become a decisive competitive factor. A reduction in lead time can be achieved by adapting the process organization to the respective requirements of an order. In addition, the structural organizational prerequisites for cross-departmental coordination of order processing must be created....

FKM 1994 Booklet No. 188 Project No. 149 Abstract: Multi-axial single-stage and fatigue strength tests for alternating bending and torsion were carried out on smooth test specimens made of heat-treatable steel 30 CrNiMo 8 under out-of-phase, medium-load, quasi-static and alternating loading. A phenomenological analysis of the position and inclination of the Wöhler and...

FKM 1994 Issue number 189 Project no. 152 Abstract: The project created a reliable data collection of test results on fatigue strength, in which - starting from the individual test - all steps of evaluation and processing are documented in a comprehensible manner. A standardized statistical re-evaluation of all test series was carried out and the most suitable statistical...

FKM 1994 Booklet No. 190 Project No. 142 Abstract: This report comprises investigations on shrink-fit shaft-gear connections with the aim of developing a mathematical design. Torsional shear tests, running tests in test gears and theoretical investigations with the aid of FEM are carried out. Torsional shear strengths based on the slippage of the bonded parts do not allow...

FKM 1995 Project No. 145-1 Final report Abstract: Components subjected to operational stresses are subject to complex load-time curves, which usually have significant mean stresses. Due to the manufacturing process, they exhibit characteristic surface topographies, surface hardening and surface residual stress states which influence the fatigue strength. The influence of the...

FKM 1995 Booklet No. 192 Project No. 149 Abstract: The aim of the project was to examine the stress-mechanical and statistical influence of variables with regard to service life estimation according to the local concept and the nominal stress concept. Fatigue tests were carried out on smooth and notched round specimens with diameters of 8, 16 and 32 mm of the material 42...

FKM 1995 Project No. 145-3 Abstract: In this research project, models based on the ör1lichen concept for an engineering crack life calculation of surface strengthened components are described. The influence of different material properties in the surface layer and in the core, macro residual stresses and surface fineness is determined. In the experimental part of the...

FKM 1995 Project No. 145-4 Final report Abstract: In this research project, a J-integral related crack propagation model has been developed with special consideration of crack opening and crack closing behavior. It was possible to numerically describe the crack propagation phase within the notch region for single-stage, two-stage and service load tests on notched disks. This...

FKM 1995 Project No. 159 Abstract: Many components in mechanical and plant engineering are subject to stress sequences that are characterized by a succession of small high-frequency amplitudes and relatively few large amplitudes. The few large amplitudes can be regarded as overloads. In addition, incorrect operation, misuse or even malfunctions can cause overloads that are...

FKM 1995 Booklet No. 196 Project No. 156 Abstract: The report contains the results of experimental investigations on the influence of the surface layer condition generated by turning on the fatigue strength. The surface roughness, residual stress state, material strength, type of loading (normal and shear stresses) and loading regime (single-stage and random loading) were...