An array containing the total strains at the beginning of the increment. If thermal expansion is included in the same material definition, the strains passed into UMAT are the mechanical strains only (that is, the thermal strains computed based upon the thermal expansion coefficient have been subtracted from the total strains). These strains are available for output as the “elastic” strains.
DSTRAN(NTENS)
Array of strain increments. If thermal expansion is included in the same material definition, these are the mechanical strain increments (the total strain increments minus the thermal strain increments).
上面说如果有热膨胀应变定义在同一材料中,假如我在cae中定义了一种材料名称为“Material-1”,这句话有两种理解,
1、这句话指的是在umat中定义热膨胀应变,热膨胀系数
2、在cae中定义“材料”时候选择“general------user Material ”+“mechanical----expansion”
假如是第一种,我在umat中定义热膨胀应变,那么由于温度改变的应变不能叠加到总体应变stran中。
而第二种的话,abaqus程序自己计算膨胀应变,同时会把应变反映到实际结构中。
按照帮助中的理解是第二种应该,但是如果我想用第一种的话,该怎么办?