Numerical analysis of point-sharp indentation-load relaxation simulated using the finite-element method to characterize the power-law creep deformation of a visco-elastoplastic solid
Numerical analysis of point-sharp indentation-load relaxation simulated using the finite-element method to characterize the power-law creep deformation of a visco-elastoplastic solid
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DOI：
10.1016/j.ijsolstr.2021.111417
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发表时间：
2022-01-10
影响因子：
3.6
通讯作者：
Wakai, Fumihiro
中科院分区：
文献类型：
--
作者：
Akatsu, Takashi;Akimoto, Yoshihiro;Wakai, Fumihiro
使用有限元方法模拟幂律蠕变变形 (PLCD) 的粘弹塑性固体 (VEPS) 上的点锐压痕的修正压痕载荷松弛 (ILR)，即压痕应力松弛 (ISR) 与线性 VEPS 上的明显不同，因为 (1) 在恒定压痕深度下，压痕周围存在显着的驻留时间依赖性堆积，(2) 非指数 ISR，以及 (3)与 a 相关的 ISR 速率，其中 Y 和 E 分别是压痕实体的屈服应力和杨氏模量。基于特征 ISR 的数值分析，提出了一种逐步程序来估计 ILR 试验中 PLCD 的指数前蠕变常数和应力指数。
The modified indentation-load relaxation (ILR), i.e. indentation-stress relaxation (ISR), of point-sharp indentation on a visco-elastoplastic solid (VEPS) with the power-law creep deformation (PLCD) simulated using the finite-element method differs obviously from that on a linear VEPS because of (1) remarkable dwell time dependent piling-up around an indentation at constant indentation depth, (2) nonexponential ISR, and (3) a-dependent ISR rate, where Y and E are the yield stress and Young's modulus of the indented solid, respectively. Based on the numerical analysis of the characteristic ISR, a stepwise procedure is proposed to estimate the pre exponential creep constant and stress exponent of PLCD from an ILR test.