A thru thickness crack of 10cm long is discovered on a 1m wi

A thru thickness crack of 10cm long is discovered on a 1m wide by 2m tall plate as shown. The plate is subjected to a uniform tensile stress field of 50MPa. The plate has a fracture toughness as a function of temperature as shown in the plot below. Considering a FOS of 1.4 (on stresses), what is the minimum allowable temperature this plate can operate without unstable fracture? An 8\' long simply supported beam is subjected to a varying load at its center with maximum/minimum load of 50kips/10kips respectively. The beam has a rectangular cross section with width of2\" and height of 8\" made of a material with Ultimate Strength (S_u) of 100ksi, Yield Strength of 80ksi and f = 0.75. Considering a Surface factor of 0.6 and all other factors of 1.0; Determine factors of safety for infinite fatigue life using Modified Goodman and ASME criteria If it doesn\'t last for infinite cycles under one of the above, determine its estimated life for that criteria

Solution

The answer of following question is as follows.

The factor of saftey for infinite fatigue life using modified Goodman is 5 .