On the Role of Crystallographic Anisotropy and Texture in Damage Tolerance of Magnesium and Its Alloys
On the Role of Crystallographic Anisotropy and Texture in Damage Tolerance of Magnesium and Its Alloys
复制标题
晶体各向异性和织构对镁及其合金损伤耐受性的作用
DOI：
10.1007/978-3-030-65528-0_14
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Joshi, Shailendra P.
中科院分区：
文献类型：
--
作者：
Baweja, Shahmeer;Indurkar, Padmeya;Joshi, Shailendra P.
镁及其合金显著的晶体塑性各向异性通过织构反映在其多晶响应中。虽然已经研究了织构-强度关系，但织构变化对损伤的作用仍然难以捉摸。挑战在于获得将净塑性各向异性与宏观损伤模式联系起来的相关度量。一种可能的方法是采用损伤的机械描述。在这方面的实验和理论工作的推动下，我们利用Hill屈服函数通过Hill塑性各向异性张量来表征多晶镁的净塑性各向异性。基于组件的参数提供了一种预测伤害的方法。利用我们最近广泛的三维晶体塑性模拟的结果，我们将净塑性各向异性分别映射到拉伸和压缩响应的系数上。基于这些系数的指标可以作为织构多晶的破坏倾向的指标：(i)孔隙演化，或（ii）剪切不稳定性。试图了解织构变异和晶体塑性各向异性在不同加载条件下损伤中的潜在作用。
The remarkable crystallographic plastic anisotropy of magnesium and its alloys reflects in its polycrystal response via texture. While texture-strength linkages have been studied, the role of textural variability on damage remains elusive. The challenge is to obtain relevant metrics that relate the net plastic anisotropy to macroscopic modes of damage. A possible approach is to adopt mechanistic descriptions of the damage. Motivated by the recent experimental and theoretical works in this direction, here we appeal to the Hill yield function to characterize the net plastic anisotropy of polycrystalline magnesium via the Hill plastic anisotropy tensor. Metrics based on the components ofoffer a way to predict damage as a possible damage predictor. Using the results from our recent extensive three-dimensional crystal plasticity simulations for a wide range of textures, we map the net plastic anisotropy on to the coefficients of, separately for the tensile and compressive responses. Metrics based on these coefficients serve as indicators for the propensity of textured polycrystals to damage by: (i) porosity evolution, or (ii) shear instability. An attempt is made to understand the potential roles textural variability and crystallographic plastic anisotropy play in damage under different loading conditions.
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DOI：
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发表时间：
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期刊：
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