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Questions and Answers
What is the main use of axles in the context of bending?
What is the main use of axles in the context of bending?
The main use of axles is bending, where bending moment causes normal stress.
What is the typical nature of the fatiguing stress in axles?
What is the typical nature of the fatiguing stress in axles?
The nature of the fatiguing stress in axles is pulsating.
What are the main uses of shafts in the context of rotary bending and twisting?
What are the main uses of shafts in the context of rotary bending and twisting?
The main uses of shafts are rotary bending and twisting.
What are the key considerations in the pre-planning and design of shafts?
What are the key considerations in the pre-planning and design of shafts?
What is the purpose of the Smith diagram?
What is the purpose of the Smith diagram?
What is the purpose of reducing stress concentration in drilled holes in axles?
What is the purpose of reducing stress concentration in drilled holes in axles?
What factors influence the endurance limit for machine elements?
What factors influence the endurance limit for machine elements?
How is the load versus time relationship expressed when calculating fatigue stresses?
How is the load versus time relationship expressed when calculating fatigue stresses?
What principle is used to determine if a component will not fracture during recorded time?
What principle is used to determine if a component will not fracture during recorded time?
How is the surface roughness factor (b2) impacted?
How is the surface roughness factor (b2) impacted?
What does the utilization factor (a) indicate in static or fatigue calculation?
What does the utilization factor (a) indicate in static or fatigue calculation?
What does the inhibit factor (βk) account for?
What does the inhibit factor (βk) account for?
What factors are used to calculate the inhibit factor (βk)?
What factors are used to calculate the inhibit factor (βk)?
What happens if the utilization factor is greater than 1 in static stress or fatigue conditions?
What happens if the utilization factor is greater than 1 in static stress or fatigue conditions?
What must be determined in the block diagram for calculating components for static stress and fatigue?
What must be determined in the block diagram for calculating components for static stress and fatigue?
What does the shape factor (αk) depend on?
What does the shape factor (αk) depend on?
What are the sensitivity factors (ηk) for various materials?
What are the sensitivity factors (ηk) for various materials?
What are the three sections of the Wöhler-curve?
What are the three sections of the Wöhler-curve?
How can the inhibit factor be calculated for a shaft shoulder?
How can the inhibit factor be calculated for a shaft shoulder?
What is the purpose of the FKM engineering guidelines?
What is the purpose of the FKM engineering guidelines?
What does the finite life section of the Wöhler-curve involve?
What does the finite life section of the Wöhler-curve involve?
What values are provided in standard tables for inhibit factors?
What values are provided in standard tables for inhibit factors?
How can the safety zone for machine elements be constructed?
How can the safety zone for machine elements be constructed?
What does the FKM engineering guidelines not require knowledge of?
What does the FKM engineering guidelines not require knowledge of?
At what possibility of survival is the calculation and checking done?
At what possibility of survival is the calculation and checking done?
How can stress concentration be reduced?
How can stress concentration be reduced?
What is the quotient used to test the adequacy of a component in static or fatigue calculation?
What is the quotient used to test the adequacy of a component in static or fatigue calculation?
What is the name of the German railway engineer who conducted systematic investigations of metal fatigue in train shafts and axles?
What is the name of the German railway engineer who conducted systematic investigations of metal fatigue in train shafts and axles?
What phenomenon leads to cracks appearing in components above a certain stress level, resulting in crack propagation and eventual failure?
What phenomenon leads to cracks appearing in components above a certain stress level, resulting in crack propagation and eventual failure?
What type of stress are preloaded bolt joints under dynamic loads usually subjected to?
What type of stress are preloaded bolt joints under dynamic loads usually subjected to?
What is used to model the probability of fracture in the statistical background of fatigue?
What is used to model the probability of fracture in the statistical background of fatigue?
What represents stress amplitudes acting in the fracture cross-section for different number of load cycles associated with a 10% probability of failure?
What represents stress amplitudes acting in the fracture cross-section for different number of load cycles associated with a 10% probability of failure?
What type of stress do rotating shafts' keyways and grooves represent?
What type of stress do rotating shafts' keyways and grooves represent?
What does the Haigh diagram represent in relation to fatigue?
What does the Haigh diagram represent in relation to fatigue?
What is the alternative representation of fatigue limit data for different mean stresses and amplitudes?
What is the alternative representation of fatigue limit data for different mean stresses and amplitudes?
What does the Wöhler curve consist of?
What does the Wöhler curve consist of?
What type of stress does checking for fatigue deal with?
What type of stress does checking for fatigue deal with?
What is checked when calculating for endurance limit?
What is checked when calculating for endurance limit?
What is the cross-section of rotating shafts usually like?
What is the cross-section of rotating shafts usually like?
Study Notes
- Rotating shafts: Cross-section is usually a circle or ring, subjected to rotary folding bending stress.
- Fatigue phenomenon: Cracks appear in components above a certain stress level, leading to crack propagation and eventual failure.
- Rotating shafts: Keyways and grooves are stress concentration points.
- Checking for fatigue: Deals with sinusoidal stress with constant amplitudes, which can be traced back to this case through Fourier analysis.
- Preloaded bolt joints under dynamic loads: Subjected to pure pulsating stress or fluctuating stress between minimum and maximum values.
- Statistical background of fatigue: Lifetime deviations due to uncertainty of crack appearance time and propagation speed.
- Statistical background of fatigue: Gaussian distribution used to model probability of fracture, known as the normal distribution function.
- August Wöhler: German railway engineer who conducted systematic investigations of metal fatigue in train shafts and axles.
- Wöhler curve: Represents stress amplitudes acting in the fracture cross-section for different number of load cycles associated with a 10% probability of failure.
- Wöhler curve: Consists of low-cycle, finite life, and high-cycle fatigue sections.
- Calculation for endurance limit: Checks whether applied stress is lower than the endurance limit.
- Haigh diagram: Represents fatigue limit of Wöhler curves at different mean stresses.
- Smith diagram: Alternative representation of fatigue limit data for different mean stresses and amplitudes.
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Description
Test your knowledge of the Smith diagram and the construction of the approximate Smith chart according to the recommendation of the German engineering association VDI. This quiz covers the fatigue limit of Wöhler curves at different mean stress values and the construction of the Smith diagram.
