vumat 代码，用于abaqus explicit 金属塑性伤害模拟(vumat subrountine for abaqus explicit ,the hill parameter is to set 0.5 and 1.5 by default.)

基于hill本构模型和各向同性强化的MMC 伤害准则的vumat实现(hill yield+isotropic hardening+MMC damage vumat)