Dataset name:
Experimental analysis of residual stress evolution under cyclic mechanical loading in 42CrMo4+QT (1.7225) including parametrization data

Authors and Affiliations:
Tom Schneider (a), Jens Gibmeier (b) and Markus Kstner (a)

 (a) TUD Dresden University of Technology, Institute of Solid Mechanics, Dresden, Germany
 (b) Karlsruhe Institute of Technology, Institute of Applied Materials, Karlsruhe, Germany

Aim of this dataset:
This data set contains various results from (cyclic) tests with 42CrMo4+QT/SAE4140. The first part contains the results of cyclic 4-point bending tests on cuboid specimens. They were used to measure the residual stress. Each specimen was loaded with a certain number of load cycles, after which the test was stopped and the residual stress was measured. From this, the development of the residual stresses under the cyclic load can be determined.
The second part of the data set contains data from characterization tests. Various uniaxial tests were carried out on a material sample in order to obtain information for the parameterization of numerical models for predicting the development of residual stresses from the first part of this contribution.

Part One - BENDING
------------------
The first part contains results of cyclic 4 point bending tests at cuboid specimen and residual stress data. In order to investigate the residual stress change during the cyclic loading, each specimen's loading was stopped after certain load cycles. They were subsequently used for the determination of the residual stress profile. For this purpose, the incremental hole drilling method was employed.

    ---Initial bending 
        
        The result of two specimen (#0007 & #0124) during an inital loading and unloading with a maximum load of F_max=15kN.
        
        Machine:                INSTRON uniaxial servohydraulic cylinder (40kN)
        Included data:          ARAMIS DIC result for the whole process including the machine data of force and position
        Specimen geometry:      270x35x8mm (see documentation pictures)
        Included evaluation:    -
    
    ---Cyclic bending
        
        The result of 5 specimen loaded until total specimen fracture.
        
        Machine:                INSTRON uniaxial servohydraulic cylinder (40kN)
        Included data:          machine data of force and position
        Specimen geometry:      270x35x8mm (see documentation pictures)
        Included evaluation:    -
    
    ---Residual stress measurements
        
       Bending specimen were loaded up to a certain number of load cycles, respectively. Afterwards, the incremental hole drilling method at the tension side of the beam specimen in the symmetry plane was used to determine the residual stress profile in layers close to the surface. For most load cycle numbers two specimens were used.
       
       Machine:                 1,6mm drilling cutter with air powered 200e3 1/min turbine drilling motor
       Included data:           processed residual stress values for different directions, evaluated according to differential method with calibration with cubic spline functions
       Specimen geometry:       270x35x8mm (see documentation pictures)
       Included evaluation:     -
       
        
Part Two - Characterization
--------------------------
The second part consists of the material characterization data necessary for parameterizing numerical models in order to model the benchmark experiments from part one. Contained are a monotonic tensile test, constant strain amplitude tests, stress-strain data from low cycle strain controlled loading and results from ratcheting tests at different load levels.
    
    ---Tensile test
        
        Result of a tensile test
        
        Machine:                INSTRON uniaxial servohydraulic cylinder (100kN)
        Included data:          ARAMIS evaluated stress-strain curve and determined monotonic material parameters
        Included evaluation:    -
    
    ---Constant strain amplitude data
        
        Results of constant strain amplitude fatigue tests
        
        Machine:                INSTRON uniaxial servohydraulic cyclinder (100kN)
        Strain sensor:          5% clip on extensometer
        Included data:          machine data (position & force) per load cycle and processed data with stress and strain values per load cycle (partly interpolated for simulation)
        Included evaluation:    -
        
    ---Low cylic strain controlled data
        
        Results of a few strain controlled cycles with variable amplitude loading.
        
        Machine:                INSTRON uniaxial servohydraulic cyclinder (100kN)
        Strain sensor:          5% clip on extensometer for controlling the test, ARAMIS DIC for evaluation
        Included data:          processed data (machine data would only be force value since test were controlled by strain clip but strain was measured by ARAMIS DIC)
        Included evaluation:    -
    
    ---Ratcheting data
        
        Results of force controlled tests at various load levels
        
        Machine:                INSTRON uniaxial servohydraulik cylinder (100kN)
        Strain sensor:          5% clip on extensometer
        Included data:          processed data and machine data load cycle wise and partially as snapshot
        Included evaluation:    -
        

Acknowledgements:
This contribution results from a collaboration supported by the Deutsche Forschungsgemeinschaft (DFG) in the Priority Program SPP2013 - Targeted Use of Forming Induced Residual Stresses in Metal Components with Grant No. KA 3309/7-3. Thanks go to the scientific staff at the IAM-WK who participated in the time-consuming hole drilling analyses, in particular D. Gabani and N. Simon. We also thank the members of the expert group Simulation and Modelling of SPP2013 for the discussions from which the present paper results.

Citing:
Please cite this dataset in your publications if you use it in your research.

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