Sökning: "ultrasonic fatigue testing"
Visar resultat 1 - 5 av 8 avhandlingar innehållade orden ultrasonic fatigue testing.
1. Very high cycle fatigue of high performance steels
Sammanfattning : Many engineering components reach a finite fatigue life well above 109 load cycles. Some examples of such components are found in airplanes, automobiles or high speed trains. For some materials the fatigue failures have lately been found to occur well after 107 load cycles, namely in the Very High Cycle Fatigue (VHCF) range. LÄS MER
2. Very high cycle fatigue of automotive steels : Testing and computation at 20 kHz
Sammanfattning : Mechanical fatigue failure occurs in components subjected to cyclic loading. A crack initiates at critical regions in the component and propagates during repeated loading. The expected fatigue life depends on the level, type and frequency of the loading. LÄS MER
3. Very high cycle fatigue of tool steels
Sammanfattning : An increasing number of engineering components are expected to have fatigue life in the range of 107 - 1010 load cycles. Some examples of such components are found in airplanes, automobiles and high speed trains. LÄS MER
4. Non-destructive measurement of near-surface cracks in railheads : with focus on ultrasonic inspections
Sammanfattning : Near-surface cracks in railhead that caused by rolling contact fatigue (RCF) is one of a kind rail defects that degrade rail track quality. Dependent on the trail load, the cracks can reach to severe level quickly. LÄS MER
5. Very high cycle fatigue of duplex stainless steels and stress intensity calculations
Sammanfattning : Very high cycle fatigue (VHCF) is generally considered as the domain of fatigue lifetime beyond 10 million (107) load cycles. Few examples of structural components which are subjected to 107-109 load cycles during their service life are engine parts, turbine disks, railway axles and load-carrying parts of automobiles. LÄS MER