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首页> 外文会议>Annual Meeting Exhibition of The Minerals, Metals Materials Society >On the Load Multiaxiality Effect on the Cyclic Behaviour of Maq nesiunn Alloys
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On the Load Multiaxiality Effect on the Cyclic Behaviour of Maq nesiunn Alloys

机译：论对MAQ Nesiunn合金循环行为的负荷多轴效应

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While most fatigue-related studies on wrought magnesium alloys are under uniaxial push-pull loading condition, structural members are mostly under multiaxial stresses in real-life applications. This study addresses the effect of load multiaxiality on the cyclic behaviour of several wrought magnesium alloys: AZ31B, AM30, AZ80, and ZK60 under multiaxial tension/compression-torsion loading. In particular, the influence of the presence of shear on normal stress response and vice versa is studied. In addition, phase angle effects on the stress-strain response and fatigue life are discussed. Strain energy density (SED) is introduced as a suitable fatigue damage parameter to connect and compare uniaxial and multiaxial cases. It is shown that irrespective of loading direction and/or phase angle, SED closely correlates experimental results. Beyond strain of ~0.4-0.5%, the strain-controlled cyclic behaviour in uniaxial push-pull is dominated by twining/de-twinning, while in pure shear deformation is dominated by basal slip. The effect of each of these load directions on the other in a multiaxial loading is considered in two cases: at low axial strain amplitudes the interaction is mutual, and at high axial strain amplitudes axial strain dominates. It is believed that the re-orientation of basal planes due to twinning/de-twinning caused by axial strain favours basal slip in twinned grains resulting in better accommodation of shear strain. Further, three load phase angles of 0, 45, and 90 were considered. It is observed that the phase angle has minimal effect on life at low axial strain values; however, at higher axial strain amplitudes out-of-phase angle causes more damage. The re-orientation of matrix due to twinning and rotation of the principal axis due to phase angle shift increase the chance of different slip/twin systems to be activated resulting in lower lives.
机译：虽然大多数关于锻造镁合金的疲劳相关的研究在单轴推拉负载条件下，结构构件主要在现实寿命应用中的多轴应力下。该研究解决了负荷多轴对多次锻造镁合金的循环行为的影响：AZ31B，AM30，AZ80和ZK60在多轴张力/压缩扭转负载下。特别地，研究了剪切在正常应力响应上的影响，反之亦然。另外，讨论了对应力 - 应变响应和疲劳寿命的相位角效应。应变能量密度（SED）作为合适的疲劳损伤参数，以连接和比较单轴和多轴壳体。结果表明，无论加载方向和/或相位角如何，SED都密切相关的实验结果。超出应变〜0.4-0.5％，单轴推拉中的应变控制的循环行为是通过缠绕/去孪生来支配，而在纯剪切变形中由基底滑动支配。在两种情况下考虑了在多轴载荷中对另一个在多轴负载中的每个负载方向的影响：在低轴向应变幅度中，相互作用是相互作用，并且在高轴向应变幅度轴向应变中占主导地位。据信，由于轴向菌株引起的孪晶/去孪晶引起的基底平面的重新定位，其在孪晶晶粒中产生了更好的剪切菌株的容纳。此外，考虑了三个负载相角为0,45和90。观察到相角对低轴向应变值的寿命具有最小的影响;然而，在较高的轴向应变幅度下，相位异构的角度导致更多的损坏。由于相位角偏移引起的主轴的孪晶和旋转引起的矩阵的重新定向增加了不同滑/双系统被激活的可能性导致较低的生命。

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