getCrackTime: Generate individual fracture time
In simLife: Simulation of Fatigue Lifetimes

Description Usage Arguments Details Value Author(s) See Also

Generate individual defect time for particle fracture

1	getCrackTime(theta, a, b, stress, vickers, p, const)

`theta`	polar angle
`a`	axis length (axis orthogonal to rotational axis)
`b`	rotational axis length
`stress`	stress level
`vickers`	Vickers hardness
`p`	simulation parameter set
`const`	constant parameters for crack

The particle fracture (crack) is assumed to happen orthogonal to the major axis direction along the maximum minor axis length. Thus the projection area can be easily computed for the purpose of defect accumulation. The parameter set is made up of six parameters. Here only the second and third parameters are used to simulate the defect crack times. The failure times follow a Weibull distribution with scale parameter p2*a^2/(b*σ*cosθ*Hv) and shape parameter p3 where σ denotes the stress, a the minor axis length and Hv the Vickers hardness. The angle θ is measured between the rotational axis and the axis of main load direction. In this way we account for the orientation of particles (spheroids) when generating fracture times dependent on their tendency to be more or less oriented towards the main load direction.

numeric, the individual fracture time

Felix Ballani, M. Baaske

getDelamTime

simLife documentation built on May 2, 2019, 6:36 a.m.