Creep: Secondary Exponential Creep

Description

Defines creep data parameters according to the secondary exponential creep law.

Extensive experimental investigations into the creep behaviour of metals have shown that at very high stress levels, there is a deviation away from the straight-line relationship between and . At these high stress regimes, often referred to as "power-law breakdown" conditions, the creep strain rate is considered to depend exponentially on stress.

Toolbar Functions

See LAYOUTS: Creep.

COEFFICIENTS

C₁ is the creep strain coefficient.

C₂ is the creep stress coefficient.

C_T is the creep temperature coefficient.

PARAMETERS

Time Unit (t)

The unit of time in which the coefficients are specified.

Hardening

Not applicable to this creep law.

Temperature

This option sets whether the creep law is dependent on temperature or not.

If set, the C_T parameter may be specified and the accumulation of creep strain is influenced by the nodal temperatures. The Property Temperature Dependence (see SOLVERS Home: Case Dependence tab) also needs to be assigned in the Quasi-static or Nonlinear Transient Dynamic solver to consider the creep temperature dependence.

If not set, the C_T parameter(s) is not used and the creep behaviour is independent of any applied nodal temperatures.