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首页> 外文会议>International Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation >Experimental/modelling study of residual stress in AI/SiC_p bent bars by synchrotron XRD and slitting eigenstrain methods
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Experimental/modelling study of residual stress in AI/SiC_p bent bars by synchrotron XRD and slitting eigenstrain methods

机译：同步XRD和SIC_P弯曲条在XRD和SLITING EIGENSTRAIN方法中的剩余应力实验/建模研究

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The aim of the study presented here was to evaluate the residual stresses present in a bar of aluminium alloy 2124-T1 matrix composite (MMC) reinforced with 25vol% particulate silicon carbide (SiC_p) using X-ray diffraction and 3D profilometry (curvature measurement using Mitutoyo/Renishaw coordinate measurement machine) and comparing these results with numerical models of residual strain and stress profiles obtained by a simple inelastic bending model and Finite Element Analysis (FEA). The residual strain distribution was introduced into the test piece by plastic deformation in the 4-point bending configuration. At the first stage of this study the elastic-plastic behaviour of the MMC was characterized under static and cyclic loading to obtain the material parameters, hardening proprieties and cyclic hysteresis loops. Subsequently, synchrotron X-ray diffraction and CMM curvature measurements were performed to deduce the residual stress profile in the central section of the bar. The experimental data obtained from these measurements were used in the inelastic bending and FEA simulations. The specimens were then subjected to incremental slitting using EDM (electric discharge machining) with continuous back and front face strain gauge monitoring. The X-ray diffraction and incremental slitting results were then analysed using direct and inverse eigenstrain methods. Residual stresses plots obtained by different methods show good agreement with each other.
机译：这里提出的研究的目的是评估使用X射线衍射和3D轮廓测定的25Vol％颗粒碳化硅（SIC_P）加强的铝合金2124-T1基质复合物（MMC）中存在的残余应力（使用曲率测量Mitutoyo / renishaw坐标测量机器）并将这些结果与通过简单的无弹性弯曲模型和有限元分析（FEA）获得的残留应变和应力分布的数值模型进行比较。通过4点弯曲构造的塑性变形将残留应变分布引入试样。在本研究的第一阶段，MMC的弹性塑性行为在静态和循环载荷下表征，以获得材料参数，硬化的礼服和循环滞后环。随后，进行同步rotron X射线衍射和CMM曲率测量以推导于杆的中心部分中的残余应力分布。从这些测量结果获得的实验数据用于非弹性弯曲和FEA模拟。然后使用具有连续背部和前面应变计监测的EDM（电放电加工）对样本进行增量切割。然后使用直接和逆特征串方法分析X射线衍射和增量切割结果。通过不同方法获得的残余应力绘制彼此良好的一致性。

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