PartStrength
Application for calculation of strength properties in a cross section of a machine part or construction element
PartStrength calculates the static and dynamic strength in a cross section according
the method developed in the text book Maschinenelemente Band 1 Niemann-Winter-Höhn 4. Edition 2005. This method involves
the determination of a lot of influence factors making the calculation work quite extensive. This application is intended to automate the labourious
calculation work.
User Interface
PartStrength is multi-lingual application for Microsoft Windows.
The user can select the language for the user interface and output out of:
Identification of a Calculation Project
At the start of a new calculation project a dialog box is being opened for input of some data for the identification of the calculation project.
This dialog box contains edit controls for input of: order, project, subproject, item, part ID , calculated by, organization,
and date of calculation. A text box is also provided to hold a short note about the calculation project.
About the calculation method
The strength properties in the part are to be derived from material properties Rm
and Re of a standard test specimen with diameter d = 7.5 mm for a given material
by determination of a number of influence factors.
Material static strength properties in part cross section
- Determination of ultimate and yield strength in part by calculation of the technologic size and anisotropic influence factors
- Determination of shear strength and shear yield strength from the ultimate and yield strength in part
- Correct compressive strength and yield for cast iron materials
- Correct for the influence of higher temperatures > 100 °C
- Influence of stress concentration by determination of form factors
- Influence of plastic support and plastic notcheffect
- Influence of non linearity for lamellar cast iron GJL
- Determination of tensile, bending, shear and torsion strength and corresponding yield in part
- Calculation of safety factors for a given static load
- Calculation of safety factors for comparison stress with mixed failure criterion
Material dynamic strength properties in part cross section
- Determination of alternating tensile/compressive and shear strength for test specimen size using ratio's
- Determination of alternating tensile/compressive and shear strength in part by calculation of the technologic size and anisotropic influence factors
- Correct for the influence of higher temperatures > 100 °C
- Influence of stress concentration by determination of form α-factors
- Influence of plastic support by part form, geometric size and load case, determination of support factors
- Determination of alternating tensile, bending and torsional strength for unnotched part
- Influence of stress concentration by determination of elastic notch effect β-factors
- Influence of surface roughness in notch radius
- Influence of skin support by hardened layer or shot-peening
- Determination of alternating tensile, bending, shear and torsion strength in part
- Calculation of mean stress sensitivity coefficient
- Calculation of allowed bending and torsional stress amplitudes in part for given mean stress
- Calculation of safety factors for a given mean and dynamic stress amplitudes
- Calculation of safety factors for comparison stress with mixed failure criterion
Above summary suggest that there are a lot of calculations to do. See further for calculation results
See next page for selection of material and input part size.