Approach | Advantage | Disadvantage | Application |
---|---|---|---|
Simple and easy to analyze; | Low accuracy; | The initial design estimation; | |
Parameters required are few and easy to get; | Poor adaptability for the parameters depend on geometry and loading forms, etc.; | Long-life components such as the spring shaft and gears and other high-strength materials; | |
Rich data sources with accumulated experience can be obtained. | Unable to analyze the gap effect without considering crack. | Whole-life analysis combined with linear elastic fracture mechanics. | |
Direct access to the strain parameters by means of measurement; | Complex calculations; | Fatigue test with strain as control condition; | |
Able to conduct notched fatigue analysis; | Insufficient gap analysis; | Situation of high temperature, large strain and high stress concentration; | |
Able to judge the impact of the loads order; | Only the crack initiation is considered. | Components with less load cycles, large plasticity, such as low-strength structural steel; | |
Able to express the cyclic stress–strain response; |  | Whole-life analysis combined with linear elastic fracture mechanics. | |
Conducive to fatigue–creep mixture analysis. |  |  | |
Life prediction based on accumulative fatigue damage [33, 34] | The impact of actual magnitude and the order of loads has been taken into consideration; | Only parts of the influence factors have been considered, failed to conduct a comprehensive analysis of the complexity of life prediction; | The material and mechanical parts subjected to cyclic loading; |
Matured and widely used. | Narrow scope of application. | More used in engineering. | |
The mechanism of the crack propagation can be physics interpreted since the crack propagation is taken into consideration; | Difficult to measure and estimate the initial crack size; no research on the initial crack; | Large and important parts and structures, such as aircraft, nuclear reactors; | |
Able to control the initial damage, the examination period and working loads, etc. to ensure safety. | Uneasy to calculate the stress intensity factor of the components with complex geometry; | Metal materials with metallurgical defects in themselves and components with pores, slag and weld defects created in welding. | |
 | Elastic–plastic fracture mechanics is used since linear-elastic fracture mechanics can hardly meet requirements in general cases. |  | |
Good agreement with the fatigue mechanism in experimental observations; | Complex calculation and analysis; Insufficient research on damage mechanics of some materials and components. | Only applied for some metal materials, composite materials and concrete materials | |
Easy to measure the fatigue damage. | Â | Â | |
Unified representation, and strong universality; | Insufficient research; | Composite panels of composite tissue, such as alloy laminate, coating structure; | |
Allowed to take the mean stress and the impact of multi-directional load into account. | Few applications. | Piezoelectric material and the composites. |